Change search
Refine search result
888990919293 4501 - 4550 of 4628
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Rows per page
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sort
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
Select
The maximal number of hits you can export is 250. When you want to export more records please use the 'Create feeds' function.
  • 4501.
    Wåhlin Larsson, Britta
    Örebro University, School of Health and Medical Sciences.
    Skeletal muscle in Restless legs syndrome (RLS) and Obstructive sleep apnoea syndrome (OSAS)2009Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Restless legs syndrome (RLS) and Obstructive sleep apnoea syndrome (OSAS) are two sleep disorders that affect daily life with symptoms such as sleepiness and fatigue. It was therefore hypothesised that the skeletal muscle could be affected as symptoms from skeletal muscle are common. The overall aim of the thesis was to investigate aerobic capacity and structure of skeletal muscle in patients with OSAS and RLS and an age matched control group to provide information regarding the underlying mechanisms. The specific aims were to investigate muscle fibre composition, capillary network, capillary proliferation and sings of local inflammation in musculus tibialis anterior of RLS and OSAS.OSAS and RLS patients had a significantly lower predicted VO2 max expressed in ml/min/kg compared with the control group and in the OSAS group apnoes-hyponea index (AHI) was inversely correlated to maximal oxygen uptake Fibre type composition and muscle fibre cross sectional area in the tibialis anterior muscle was equal in all groups with a predominant proportion of slow type I fibres and a smaller fibre area in slow type I fibres compared to fast type II fibres. The distribution of fast fibres (I/IIA, IIA) did not differ except for the group IIX and IIA/IIX where OSAS and RLS had a significantly higher percentage. OSAS patients had a significantly higher number of capillaries per fibre (CAF) for slow type I fibres and CAF per fibre area (CAFA) for fast type II fibres. CFPE- index (capillary to fibre perimeter exchange) and LC/PF-index (length of capillary/perimeter of fibre) were higher in both patient groups. Vascular endothelial growth factor (VEGF) and proliferating endothelial cells were analysed by double-immunofluorescence staining and were presented to a greater extent in the patient groups compared with the healthy controls. Based on normal amounts of T-cells and macrophages in the histological picture it was also demonstrated that local inflammation was not present in the tibialis anterior muscle of RLS and OSAS whish was also supported by the absence of expression of major histocompatibility complex class I molecules (MHC class I) on the surface of the tibialis anterior muscle fibres.In conclusion, the low predicted VO2 max together with higher percentage of type IIX and IIA/IIX muscle fibres indicates a low central capacity in the patient groups. The increased capillary network and the absence of inflammation indicate the occurrence of local hypoxia in tibialis anterior muscle in patients OSAS and RLS.

  • 4502.
    Wåhlin Larsson, Britta
    et al.
    Örebro University, School of Health and Medical Sciences. Dalarna University, Falun, Sweden.
    Kadi, Fawzi
    Örebro University, School of Health and Medical Sciences, Örebro University, Sweden.
    Ulfberg, Jan
    Avesta Hospital, Avesta, Sweden.
    Piehl Aulin, Karin
    Örebro University, School of Health and Medical Sciences.
    Skeletal muscle morphology and aerobic capacity in patients with obstructive sleep apnoea syndrome2008In: Respiration, ISSN 0025-7931, E-ISSN 1423-0356, Vol. 76, no 1, p. 21-27Article in journal (Refereed)
    Abstract [en]

    Background: Despite the fact that patients with obstructive sleep apnoea syndrome (OSAS) often have symptoms at the level of skeletal muscle such as fatigue, the question of whether the structural, cellular and functional properties of limb skeletal muscles are affected has not been fully examined. Objective: The aim was to examine physiological and muscular parameters in patients with OSAS and to assess the relationship between these parameters and the clinical symptoms. Method: Eighteen patients with OSAS and 16 controls participated. Aerobic capacity was assessed using a submaximal test. Fibre type distribution and fibre area were analyzed on muscle biopsies taken from the tibialis anterior. The microvascularization was assessed using the following parameters: (1) the number of capillaries per fibre (CAF), (2) CAF per fibre area (CAFA), (3) capillary to fibre perimeter exchange (CFPE) index, which represents the interface between muscle fibre and capillaries, and (4) length of capillary/perimeter of the fibre (LC/PF) index or capillary tortuosity, which represents the percent of muscle fibre perimeter in contact with the wall of the microvessel. Results: The OSAS group had significantly lower predicted relative maximal oxygen uptake (p = 0.0047) which was inversely correlated to the apnoea/hypopnoea index (AHI; r = –0.6, p = 0.017). There was a significantly higher CFPE index for slow type I fibres (p = 0.007) and fast type II fibres (p = 0.0126) and a significantly higher LC/PF index for type I fibres (p = 0.0003) and type II fibres (p = 0.0285) in OSAS patients compared to controls. Conclusion: OSAS patients have a higher muscle microvascularization and a lower aerobic capacity than controls. Furthermore the aerobic capacity was inversely correlated to AHI.

  • 4503.
    Wåhlin Larsson, Britta
    et al.
    Örebro University, Department of Clinical Medicine. Dalarna University, Falun, Sweden.
    Kadi, Fawzi
    Örebro University, School of Health and Medical Sciences, Örebro University, Sweden.
    Ulfberg, Jan
    Avesta Hospital, Avesta, Sweden.
    Piehl Aulin, Karin
    Örebro University, Department of Clinical Medicine.
    Skeletal muscle morphology in patients with restless legs syndrome2007In: European Neurology, ISSN 0014-3022, E-ISSN 1421-9913, Vol. 58, no 3, p. 133-137Article in journal (Refereed)
    Abstract [en]

    AIM: The aim of the study was to assess the cellular and structural properties of skeletal muscle in restless legs syndrome (RLS).

    METHOD: Twenty patients and 16 controls were included. Aerobic performance was assessed using a submaximal test. On muscle biopsies taken from the tibialis anterior, fiber distribution and fiber area were analyzed together with parameters surveying the microvascularization, especially the tortuosity, which is expressed as a percent of muscle fiber perimeter in contact with the wall of the microvessel, length of capillary/perimeter of fiber (LC/PF) index.

    RESULTS: The RLS group had significantly lower predicted maximal oxygen uptake (p = 0.01) and significantly higher LC/PF index (p = 0.01) compared to the controls.

    CONCLUSION: The higher capillary tortuosity in RLS patients indicates the occurrence of significant remodeling in capillary geometry in RLS.

  • 4504.
    Wåhlin-Larsson, Britta
    et al.
    Örebro University, School of Health and Medical Sciences, Örebro University, Sweden.
    Carnac, Gilles
    Univ Montpellier I, INSERM U1046, Montpellier, France.
    Kadi, Fawzi
    Örebro University, School of Health and Medical Sciences, Örebro University, Sweden.
    The influence of systemic inflammation on skeletal muscle in physically active elderly women2014In: Age (Omaha), ISSN 0161-9152, E-ISSN 1574-4647, ISSN 0161-9152, Vol. 36, no 5, p. 9718-Article in journal (Refereed)
    Abstract [en]

    The biological mechanisms responsible for the decline in skeletal muscle mass during aging remain unknown. It is hypothesized that elevations in the level of the acute phase C-reactive protein (CRP) negatively affect skeletal muscle mass in elderly. We examined the relationship between serum CRP and muscle mass in a population of active elderly women (65-70 years; n =23). Though all subjects were physically active, serum CRP levels were negatively associated to the amount of time spent in moderate-to-vigorous physical activity (R (2) = 0.20, P = 0.032) and to skeletal muscle mass (R (2)  = 0.28, P = 0.009). We further aimed to determine the potential mechanisms behind the action of systemic inflammation on skeletal muscle by exposing myoblasts isolated from vastus lateralis to the different sera from each elderly woman. The doubling time (DT) of myoblasts increased when cells were exposed to sera with high CRP levels (R (2) = 0.27, P = 0.011), indicating that CRP contributes to the impairment of the proliferative rate of myoblasts in elderly. In order to further confirm our findings, we incubated human myoblasts in exogenous CRP. Exposition to exogenous CRP induced an increase in myoblast DT by 1.21-fold (P = 0.007) and a reduction in the expression of the proliferation marker ki-67 confirming the negative influence of CRP on myoblast proliferative rate. Collectively, these findings highlight the contribution of the systemic inflammatory status in the age-related decline in skeletal muscle function.

  • 4505.
    Wåhlin-Larsson, Britta
    et al.
    Örebro University, School of Health and Medical Sciences.
    Ulfberg, Jan
    Sleep Disorder Center, Avesta .
    Lindvall, Björn
    Muscle Center, Departments of Neurology and Clinical Pathology, Örebro University Hospital.
    Piehl-Aulin, Karin
    Örebro University, School of Health and Medical Sciences.
    Kadi, Fawzi
    Örebro University, School of Health and Medical Sciences, Örebro University, Sweden.
    Markers of local inflammation and oxidative enzymes in musculus tibialis anterior in Restless Legs Syndrome and Obstructive Sleep Apnoea SyndromeManuscript (Other academic)
  • 4506.
    Wåhlin-Larsson, Britta
    et al.
    Örebro University, School of Health and Medical Sciences. Dalarna University, Falun, Sweden.
    Ulfberg, Jan
    Avesta Hospital, Avesta, Sweden.
    Piehl-Aulin, Karin
    Örebro University, School of Health and Medical Sciences.
    Kadi, Fawzi
    Örebro University, School of Health and Medical Sciences, Örebro University, Sweden.
    The expression of vascular endothelial growth factor in skeletal muscle of patients with sleep disorders2009In: Muscle and Nerve, ISSN 0148-639X, E-ISSN 1097-4598, Vol. 40, no 4, p. 556-561Article in journal (Refereed)
    Abstract [en]

    An increased capillary network has been observed in the skeletal muscle in patients with Restless Legs Syndrome (RLS) and Obstructive sleep apnea syndrome (OSAS). These changes could be due to upregulation of growth factors responsible for angiogenesis.

    The aim of the study was to examine the occurrence and localization of VEGF and capillary proliferation in skeletal muscle of RLS (n=12), OSAS (n=12) and controls (n=11).

    Double-immunofluorescence staining for capillaries (CD31) and VEGF, and proliferating cells (Ki-67), was carried out on biopsies taken from the tibialis anterior. The percentage of capillaries expressing VEGF (CD31,VEGF+)  was significantly higher in OSAS and RLS compared to controls. The percentage of proliferating capillaries (CD31,Ki-67+)  was significantly higher in OSAS compared with controls.

    In conclusion our study shows the occurrence of proliferation of endothelial cells in skeletal muscle in RLS and OSAS, supporting an upregulation of VEGF located in capillaries probably due to local hypoxia.

  • 4507.
    Wålberg, Mads
    Karlstad University, Faculty of Health, Science and Technology (starting 2013).
    Självbestämmande teori och redskapsgymnastik: Kan autonomi-stödjande miljöer i idrott och hälsa öka elevers inre motivation?2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Working with students in Physical Education has been through a change because of, according to research, indications that young people aren´t involved in physical activities as much as in the past. This means that the educational planning should adapt to the teaching to fit as many pupils as possible free of the cognitive and physical conditions. The purpose of this study is to examine how an SDT (Self-Determination Theory)-based intervention affect students ' motivation in gymnastics. The study aims to see how an experimental intervention affects a class in comparison with another more controlled gymnastics-lesson. In order to reach the result the study has used questionnaires before and after the intervention. The result of this shows little difference in motivation changes between the groups, but the study is sharing light upon other perspectives on how to consider the objectives and issues. These differences are discussed and conclude that the study opens up new discussions and potentially new ideas by implementing of SDT pedagogically and didactically as well as suggestions for further research that can provide further proof of the SDT as a motivational approach within other areas in Physical Education.

  • 4508.
    Yngve, Agneta
    et al.
    Unit for Preventive Nutrition, Department of Medical Nutrition, Karolinska Institutet, Stockholm, Sweden.
    Nilsson, Andreas
    Unit for Preventive Nutrition, Department of Medical Nutrition, Karolinska Institutet, Stockholm, Sweden.
    Sjoström, Michael
    Unit for Preventive Nutrition, Department of Medical Nutrition, Karolinska Institutet, Stockholm, Sweden.
    Ekelund, Ulf
    Örebro universitet, Institutionen för hälsovetenskap och medicin.
    Effect of monitor placement and of activity setting on the MTI accelerometer output2003In: Medicine & Science in Sports & Exercise, ISSN 0195-9131, E-ISSN 1530-0315, Vol. 35, no 2, p. 320-326Article in journal (Refereed)
    Abstract [en]

    PURPOSE: To examine the effect of monitor placement (hip vs back) and of activity setting (treadmill vs track) on the output from the Manufacturing Technology Inc. (MTI), activity monitor (model WAM 7164).

    METHODS: In a laboratory study, 28 subjects (14 men, 14 women) walked at a normal pace, walked at a fast pace, and jogged at a comfortable pace on an indoor track. These activities were repeated on a treadmill using the individual speeds from the track locomotion. Oxygen uptake was measured simultaneously using a portable metabolic system. One activity monitor was worn on the hip and one on the lower back. In a field study, 34 subjects (18 men, 16 women) each wore two monitors (hip and low back placement) for seven consecutive days. In the laboratory study, ANOVA showed significant effects of placement ( P = 0.009) and setting ( P < 0.001), indicating that activity counts differ between different body sites and different settings (track vs treadmill). Gross energy expenditure predictive equations were developed and thereafter evaluated in the field study. Time spent at moderate and vigorous intensity of physical activity was 38% and 85% ( P < 0.001) higher when calculated from the treadmill-based equations as compared to the track-based equations. Free-living physical activity estimates were not affected by the placement.

    CONCLUSION: The relationship between activity counts and energy expenditure during laboratory locomotion is placement and setting-specific. When habitual physical activity is assessed in free-living subjects, the treadmill derived relationship between energy expenditure and activity counts may overestimate time spent at moderate intensity of physical activity, whereas the placement of the monitor does not influence on the interpretation of the data.

  • 4509.
    Yngve, Agneta
    et al.
    Unit for Preventive Nutrition, Department of Medical Nutrition, Karolinska Institutet, Stockholm, Sweden.
    Nilsson, Andreas
    Unit for Preventive Nutrition, Department of Medical Nutrition, Karolinska Institutet, Stockholm, Sweden.
    Sjoström, Michael
    Unit for Preventive Nutrition, Department of Medical Nutrition, Karolinska Institutet, Stockholm, Sweden.
    Ekelund, Ulf
    Örebro University, School of Health and Medical Sciences, Örebro University, Sweden. Unit for Preventive Nutrition, Department of Medical Nutrition, Karolinska Institutet, Stockholm, Sweden.
    Effect of monitor placement and of activity setting on the MTI accelerometer output2003In: Medicine & Science in Sports & Exercise, ISSN 0195-9131, E-ISSN 1530-0315, Vol. 35, no 2, p. 320-326Article in journal (Refereed)
    Abstract [en]

    PURPOSE: To examine the effect of monitor placement (hip vs back) and of activity setting (treadmill vs track) on the output from the Manufacturing Technology Inc. (MTI), activity monitor (model WAM 7164).

    METHODS: In a laboratory study, 28 subjects (14 men, 14 women) walked at a normal pace, walked at a fast pace, and jogged at a comfortable pace on an indoor track. These activities were repeated on a treadmill using the individual speeds from the track locomotion. Oxygen uptake was measured simultaneously using a portable metabolic system. One activity monitor was worn on the hip and one on the lower back. In a field study, 34 subjects (18 men, 16 women) each wore two monitors (hip and low back placement) for seven consecutive days. In the laboratory study, ANOVA showed significant effects of placement ( P = 0.009) and setting ( P < 0.001), indicating that activity counts differ between different body sites and different settings (track vs treadmill). Gross energy expenditure predictive equations were developed and thereafter evaluated in the field study. Time spent at moderate and vigorous intensity of physical activity was 38% and 85% ( P < 0.001) higher when calculated from the treadmill-based equations as compared to the track-based equations. Free-living physical activity estimates were not affected by the placement.

    CONCLUSION: The relationship between activity counts and energy expenditure during laboratory locomotion is placement and setting-specific. When habitual physical activity is assessed in free-living subjects, the treadmill derived relationship between energy expenditure and activity counts may overestimate time spent at moderate intensity of physical activity, whereas the placement of the monitor does not influence on the interpretation of the data.

  • 4510.
    Yttergren, Leif
    Swedish School of Sport and Health Sciences, GIH, Department of Sport and Health Sciences, Sport History Research Group.
    Den svenska "korpen": korporationsidrottens utveckling 1945-19531984In: Idrott, historia och samhälle, ISSN 0280-2775, p. 95-121Article in journal (Other academic)
  • 4511.
    Yttergren, Leif
    Swedish School of Sport and Health Sciences, GIH, Department of Sport and Health Sciences, Sport History Research Group.
    Engelsk träningshistorik som manar till efterföljd: recension av boken Professionals, Amateurs and Performance: Sports Coaching in England, 1789–1914 av Dave Day2015In: Idrottsforum.org/Nordic sport science forum, ISSN 1652-7224, no 16 aprilArticle, book review (Other academic)
    Abstract [sv]

    Från Idrottsforum:

    Vi publicerade nyligen en recension av David Epsteins The Sports Gene, som väl lämpligast beskrivs som en kraftfull gensaga mot den så kallade 10 000-timmarsregeln, framforskad av K. Anders Ericsson och populariserad av Malcolm Gladwell. Nurture står mot nature – är 10 000 timmars målmedveten träning viktigare än medfödd talang för att frambringa den yppersta idrottseliten? Ingen tror väl längre annat än att talang är en viktig förutsättning; för att återge Paul McCartneys syn på saken, ”I don’t think it’s a rule that if you do that amount of work, you’re going to be as successful as the Beatles”. Men träning är naturligtvis väl så centralt, och alltsedan människan började tävla, och det därmed blev möjligt och önskvärt att vinna, har träning varit en oundgänglig beståndsdel i allt mänskligt liv. Idrotten intar givetvis härvidlag en särställning; inget annat område är så genomsyrat av tävlande och vinnarinstinkt. Och idrottare tränar mycket, och har tränat mycket historiskt. En som ägnat idrottsträningens historia stor uppmärksamhet är Leif Yttergren, idrottshistoriker vid GIH, Gymnastik- och idrottshögskolan i Stockholm. För ett par år sedan bar hans forskningsmödor frukt i form av boken Träna är livet: Träning, utbildning och vetenskap i svensk friidrott, 1880–1995 (idrottsfourm.org 2012). Det kändes mot den bakgrunden naturligt att engagera Leif när en recensionsbok med titeln Professionals, Amateurs and Performance: Sports Coaching in England, 1789–1914 dunsade ner på forumredaktionens disk. Författare till boken är Dave Day, känd idrottshistoriker och träningsforskare vid Manchester Metropolitan University. Vår recensent uppskattar som regel sina brittiska kollegers historieskrivande, om än med reservation för den ofta förekommande bristen på vetenskaplig fernissa, vilket dock inte vidhäftar Days bok i störande grad. Ett bra och intressant och viktigt bidrag till träningsforskningen, med andra ord – men vart tog kvinnorna vägen?

  • 4512.
    Yttergren, Leif
    Swedish School of Sport and Health Sciences, GIH, Department of Sport and Health Sciences, Sport History Research Group.
    Gutnisk idrott i skolan och på fritiden: en lärarhandledning i gutniska idrotter och lekar2011 (ed. 2)Book (Other (popular science, discussion, etc.))
    Abstract [sv]

    Idrottsundervisningen i skolan har under de senaste hundra åren förändrats dramatiskt. En omvandling har ägt rum, från den strikta linggymnastiken till en tydligt idrottsprofilerad undervisning, ofta med tävlingsinslag. Många idrottslärare känner i dag att de hamnat i en påtvingad roll som förmedlare av värden som starkt förknippas med den moderna tävlingsidrottens. Hur dessa värden påverkar dagens barn och ungdom diskuteras allt oftare av människor både i och utanför skolvärlden. Vissa idrottslärare har därför börjat söka alternativa undervisningsformer.

    Ambitionen med denna bok är att ge ett alternativ till den tävlingsinriktade idrottsundervisningen. Författarna redogör för hur gutniska lekar och idrotter kan införas i dagens idrottsundervisning. Förhoppningsvis levandegörs och synliggörs ett nästan glömt kulturarv för dagens elever och lärare.

    Boken riktar sig främst till studerande vid lärarutbildningen, främst inom ämnet idrott, och verksamma lärare, men den kan givetvis också användas på fritiden av såväl gammal som ung.

    Leif Yttergren är docent vid Gymnastik- och idrottshögskolan, GIH, i Stockholm. Han har publicerat böcker och artiklar rörande olika idrottshistoriska teman i svenska och internationella tidsskrifter samt är en flitigt anlitad föredragshållare.

    Anders Ibohm är sportjournalist i Kalmar.

  • 4513.
    Yttergren, Leif
    Swedish School of Sport and Health Sciences, GIH, Department of Sport and Health Sciences, Sport History Research Group.
    I och ur spår!: en studie om konflikter och hjältar i svensk skidsport under 1900-talet2006Book (Other academic)
  • 4514.
    Yttergren, Leif
    Swedish School of Sport and Health Sciences, GIH, Department of Sport and Health Sciences, Sport History Research Group.
    Kappryttarstrejken 1899: en studie av cykelsporten och gentlemen i sekelskiftets Stockholm1990In: Historielärarnas förenings årsskrift, Vol. 1989/1990, p. 67-72Article in journal (Other academic)
  • 4515.
    Yttergren, Leif
    Swedish School of Sport and Health Sciences, GIH, Department of Sport and Health Sciences, Sport History Research Group.
    Norway, Skiing and Swede Hate: Some reflections on the World Ski Championship in Cortinas 'd Amprezzo and its Concequences.2017In: The Many Faces of Snow Sports. Finlands idrottshistoriska förenings årsbok 2017., ISSN 1237-3133, p. 226-240Article in journal (Refereed)
  • 4516.
    Yttergren, Leif
    Swedish School of Sport and Health Sciences, GIH, Department of Sport and Health Sciences, Sport History Research Group.
    Nya idrottsredskap: en kamp mellan tradition och förändring2008In: Idrott & kunskap : forskning och utveckling inom idrotten, ISSN 1652-6961, no 2, p. 54-55Article in journal (Other (popular science, discussion, etc.))
  • 4517.
    Yttergren, Leif
    Swedish School of Sport and Health Sciences, GIH, Department of Sport and Health Sciences, Sport History Research Group.
    Paerk and Varpa: Traditional sport and regional identity on Gotland2017In: De Vrije Fries: Jaarboek, ISSN 0923-6279, Vol. 97, p. 28-37Article in journal (Refereed)
  • 4518.
    Yttergren, Leif
    Swedish School of Sport and Health Sciences, GIH, Department of Sport and Health Sciences, Sport History Research Group.
    Spännande resultat och intressanta metodologiska överväganden i svårgenomtränglig text: recension av boken Paragrafer, pokaler och politiska inkast: Idrottsdistriktet Värmland 1900–1940, omvärld och formering av Bode Janzon2016In: Idrottsforum.org/Nordic sport science forum, ISSN 1652-7224, article id 14 decArticle, book review (Other academic)
  • 4519.
    Yttergren, Leif
    Swedish School of Sport and Health Sciences, GIH, Department of Sport and Health Sciences, Sport History Research Group.
    The Nordic Games: visions of a winter olympics or a national festival?1994In: International Journal of the History of Sport, ISSN 0952-3367, E-ISSN 1743-9035, Vol. 11, no 3, p. 495-505Article in journal (Refereed)
  • 4520.
    Yttergren, Leif
    Swedish School of Sport and Health Sciences, GIH, Department of Sport and Health Sciences, Sport History Research Group.
    Ti kast’ varpe: varpan, fastlandet och den gotländska identiteten under 1900-talet2002Book (Other academic)
  • 4521.
    Yttergren, Leif
    et al.
    Swedish School of Sport and Health Sciences, GIH, Department of Sport and Health Sciences, Sport History Research Group.
    Bolling, HansStockholms universitet.
    The 1912 Stockholm Olympics: essays on the competitions, the people, the city2012Collection (editor) (Other academic)
  • 4522.
    Yttergren, Leif
    et al.
    Swedish School of Sport and Health Sciences, GIH, Department of Sport and Health Sciences, Sport History Research Group.
    Hellström, John
    Swedish School of Sport and Health Sciences, GIH, Department of Sport and Health Sciences, Sport History Research Group.
    Contruction of a National Sport heroine.: Carolina Klüft in Swedish media2017In: Journal of Olympic History, ISSN 1085-5165, Vol. 25, no 1, p. 18-25Article in journal (Refereed)
  • 4523.
    Yttergren, Leif
    et al.
    Swedish School of Sport and Health Sciences, GIH, Department of Sport and Health Sciences, Sport History Research Group.
    Ibohm, Anders
    Gutnisk idrott i skolan och på fritiden: en lärarhandledning i gutniska idrotter och lekar för grund- och gymnasieskolan2000Book (Other (popular science, discussion, etc.))
  • 4524.
    Yu, Ji-Guo
    Umeå University, Faculty of Medicine, Department of Surgical and Perioperative Sciences, Sports Medicine.
    Effects of fatigued swimming on erythrocyte membrane in rats1993In: Yantai Teachers University Journal, ISSN 1004-4930, Vol. 9, no 1, p. 56-59Article in journal (Refereed)
    Abstract [en]

    The effects of fatigued swimming on lipid peroxidation in erythrocyte membranae and plasma of rat have been studied. The results show that fatigued swimming can increase the MDA level and decrease the activities of Na+ , K+-ATPase and Ca++-ATPase in erythrocyte membranae.

  • 4525. Yu, Ji-Guo
    Effects of Shen-Qi Preparation on Sports CapacityManuscript (preprint) (Other academic)
    Abstract [en]

    Shen-Qi preparation compounded using ginseng and astragalus as main ingre dients was taken by twelve sportsmen six weeks running.The aerobic working capacity of the sportsmen strengthen and accumulation of lactic acid in the body decrease.Lactic acid can be clean up fast in the period of recovery,and BUN level decrease after the sportsmen exercise for a long time

  • 4526.
    Yu, Ji-Guo
    et al.
    Umeå University, Faculty of Medicine, Department of Surgical and Perioperative Sciences, Sports Medicine.
    Bonnerud, Patrik
    Department of Health Sciences, Luleå University of Technology, Luleå.
    Eriksson, Anders
    Department of Health Sciences, Luleå University of Technology, Luleå.
    Stål, Per S.
    Umeå University, Faculty of Medicine, Department of Integrative Medical Biology (IMB), Anatomy.
    Tegner, Yelverton
    Department of Health Sciences, Luleå University of Technology, Luleå.
    Malm, Christer
    Umeå University, Faculty of Medicine, Department of Surgical and Perioperative Sciences, Sports Medicine.
    Effects of long term supplementation of anabolic androgen steroids on human skeletal muscle2014In: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 9, no 9, article id e105330Article in journal (Refereed)
    Abstract [en]

    The effects of long-term (over several years) anabolic androgen steroids (AAS) administration on human skeletal muscle are still unclear. In this study, seventeen strength training athletes were recruited and individually interviewed regarding self-administration of banned substances. Ten subjects admitted having taken AAS or AAS derivatives for the past 5 to 15 years (Doped) and the dosage and type of banned substances were recorded. The remaining seven subjects testified to having never used any banned substances (Clean). For all subjects, maximal muscle strength and body composition were tested, and biopsies from the vastus lateralis muscle were obtained. Using histochemistry and immunohistochemistry (IHC), muscle biopsies were evaluated for morphology including fiber type composition, fiber size, capillary variables and myonuclei. Compared with the Clean athletes, the Doped athletes had significantly higher lean leg mass, capillary per fibre and myonuclei per fiber. In contrast, the Doped athletes had significantly lower absolute value in maximal squat force and relative values in maximal squat force (relative to lean body mass, to lean leg mass and to muscle fiber area). Using multivariate statistics, an orthogonal projection of latent structure discriminant analysis (OPLS-DA) model was established, in which the maximal squat force relative to muscle mass and the maximal squat force relative to fiber area, together with capillary density and nuclei density were the most important variables for separating Doped from the Clean athletes (regression  =  0.93 and prediction  =  0.92, p<0.0001). In Doped athletes, AAS dose-dependent increases were observed in lean body mass, muscle fiber area, capillary density and myonuclei density. In conclusion, long term AAS supplementation led to increases in lean leg mass, muscle fiber size and a parallel improvement in muscle strength, and all were dose-dependent. Administration of AAS may induce sustained morphological changes in human skeletal muscle, leading to physical performance enhancement.

  • 4527.
    Yu, Ji-Guo
    et al.
    Umeå University, Faculty of Medicine, Department of Surgical and Perioperative Sciences, Sports Medicine.
    Carlsson, Lena
    Umeå University, Faculty of Medicine, Department of Integrative Medical Biology (IMB), Anatomy.
    Thornell, Lars-Eric
    Umeå University, Faculty of Medicine, Department of Integrative Medical Biology (IMB), Anatomy.
    Evidence for myofibril remodeling as opposed to myofibril damage in human muscles with DOMS: an ultrastructural and immunoelectron microscopic study.2004In: Histochemistry and Cell Biology, ISSN 0948-6143, E-ISSN 1432-119X, Vol. 121, no 3, p. 219-227Article in journal (Refereed)
    Abstract [en]

    The myofibrillar and cytoskeletal alterations observed in delayed onset muscle soreness (DOMS) caused by eccentric exercise are generally considered to represent damage. By contrast our recent immunohistochemical studies suggested that the alterations reflect myofibrillar remodeling (Yu and Thornell 2002; Yu et al. 2003). In the present study the same human muscle biopsies were further analyzed with transmission electron microscopy and immunoelectron microscopy. We show that the ultrastructural hallmarks of DOMS, Z-disc streaming, Z-disc smearing, and Z-disc disruption were present in the biopsies and were significantly more frequent in biopsies taken 2-3 days and 7-8 days after exercise than in those from controls and 1 h after exercise. Four main types of changes were observed: amorphous widened Z-discs, amorphous sarcomeres, double Z-discs, and supernumerary sarcomeres. We confirm by immunoelectron microscopy that the main Z-disc protein alpha-actinin is not present in Z-disc alterations or in the links of electron-dense material between Z-discs in longitudinal register. These alterations were related to an increase of F-actin and desmin, where F-actin was present within the strands of amorphous material. Desmin, on the other hand, was seen in less dense regions of the alterations. Our results strongly support that the myofibrillar and cytoskeletal alterations, considered to be the hallmarks of DOMS, reflect an adaptive remodeling of the myofibrils.

  • 4528.
    Yu, Ji-Guo
    et al.
    Umeå University, Faculty of Medicine, Department of Surgical and Perioperative Sciences, Sports Medicine.
    Che, Baoren
    Dept. Physical Education, Yantai Teacher's University, Yantai, China.
    Effects of exercise intensity on muscle tissue free radical metabolism and serum enzymes1996In: Journal of Physical Education, ISSN 1006-7116, Vol. 4, no 2, p. 20-22Article in journal (Refereed)
    Abstract [zh]

    以二种不同强度运动,测定运动结束后不同时间内股四头肌MDA含量及SOD、GSH-PX活性,并测定了相应时间内的血清酶活性.结果发现长时间力竭性运动引起肌组织MDA含量增加的同时,SOD和GSH-PX活性下降,血清CK、LDH及Mb含量上升;短时间间歇运动后,尽管MDA变化不明显,但SOD和GSH-PX趋于上升,且血清酶活性也在运动后有上升表现.

  • 4529.
    Yu, JiGuo
    et al.
    Umeå University, Faculty of Medicine, Department of Surgical and Perioperative Sciences, Sports Medicine.
    Che, Baoren
    Dept. Physical Education, Yantai Teacher's University, Yantai, China.
    Effects of exercise intensity on oxygen transportation capacity of red blood cells1995In: Shandong Sports Science & Technology, ISSN 1009-9840, Vol. 18, no 1, p. 5-8Article in journal (Refereed)
    Abstract [zh]

    本文以二种不同的运动强度对受试者进行为期六周的身体训练,并在训练的不同阶段进行4×400m间歇性剧烈运动,测定剧烈运动前后血液载氧能力各参数的变化。结果表明,运动训练在增加血容量的同时,降低了Hb浓度及Her,但机体VO_2max仍然明显提高。剧烈运动后Hb及Hct均明显升高,PV减少,显示运动对血液系统产生浓缩作用。由于酸性代谢产物的积累及机械损伤作用,血液中老化红细胞增多。

  • 4530.
    Yu, Ji-Guo
    et al.
    Umeå University, Faculty of Medicine, Department of Surgical and Perioperative Sciences, Sports Medicine.
    Che, Baoren
    Exercise training induces increased lipid peroxidation in red blood cells1997In: Chinese Journal of Sports Medicine, ISSN 1000-6710, Vol. 16, no 2, p. 145-147Article in journal (Refereed)
    Abstract [zh]

    本文采用2种不同的运动强度对受试者进行6周的运动训练,并在训练的不同阶段进行剧烈运动,测定了运动前后反映红细胞老化状态的各项指标:膜MDA含量、Na,K-ATPase活性、SOD活性以及红细胞唾液酸含量。结果表明,不同强度的运动训练均引起血液系统中年轻红细胞比例上升,但影响的程度有所差异。不同训练阶段进行剧烈运动,由于血液系统对训练的适应状态不同,其影响也有所不同,但剧烈运动的结果仍引起红细胞老化加速。

  • 4531.
    Yu, JiGuo
    et al.
    Umeå University, Faculty of Medicine, Department of Surgical and Perioperative Sciences, Sports Medicine.
    Che, Baoren
    Dept. Physical Education, Yantai Teacher's University.
    Mechanisms of Sport Anemia1996In: Shandong Sports Science & Technology, ISSN 1009-9840, Vol. 15, no 3, p. 45-47Article, review/survey (Refereed)
    Abstract [zh]

    运动员是贫血发生的高危人群,研究运动性贫血发生、发展的规律并采取相应的措施预防运动性贫血的发生一直是许多研究者所关心的问题。本文综述了国内外这方面的研究成果,从三个方面加以系统的论述,以期为进一步的研究提供有益的线索。

  • 4532.
    Yu, Ji-Guo
    et al.
    Umeå University, Faculty of Medicine, Department of Surgical and Perioperative Sciences, Sports Medicine.
    Che, Baoren
    Oxidative damage in red blood cells induced by exercise training1996In: Yantai Teachers University Journal, ISSN 1004-4930, Vol. 12, no 2, p. 138-141Article in journal (Refereed)
    Abstract [en]

    The effects of two different intensitive training on red ceils are studied,and the relationship between oxidant damage and ageing of red cells is analysed.

  • 4533.
    Yu, Ji-Guo
    et al.
    Umeå University, Faculty of Medicine, Department of Surgical and Perioperative Sciences, Sports Medicine.
    Fürst, Dieter O
    Department of Cell Biology, Institute for Biochemistry and Biology, University of Potsdam, Potsdam, Germany.
    Thornell, Lars-Eric
    Umeå University, Faculty of Medicine, Department of Integrative Medical Biology (IMB), Anatomy.
    The mode of myofibril remodelling in human skeletal muscle affected by DOMS induced by eccentric contractions.2003In: Histochemistry and Cell Biology, ISSN 0948-6143, E-ISSN 1432-119X, Vol. 119, no 5, p. 383-93Article in journal (Refereed)
    Abstract [en]

    Myofibrillar Z-disc streaming and loss of the desmin cytoskeleton are considered the morphological hallmarks of eccentric contraction-induced injury. The latter is contradicted by recent studies where a focal increase of desmin was observed in biopsies taken from human muscles with DOMS. In order to determine the effects of eccentric contraction-induced alterations of the myofibrillar Z-disc, we examined the distribution of alpha-actinin, the Z-disc portion of titin and the nebulin NB2 region in relation to actin and desmin in DOMS biopsies. In biopsies taken 2-3 days and 7-8 days after exercise, we observed a significantly higher number of fibres showing focal areas lacking staining for alpha-actinin, titin and nebulin than in biopsies taken from control or 1 h after exercise. None of these proteins were part of Z-disc streamings but instead they were found in distinct patterns in areas characterised by altered staining for desmin and actin. These were preferentially seen in regions with increased numbers of sarcomeres in parallel myofibrils. We propose that these staining patterns represent different stages of sarcomere formation. These findings therefore support our previous suggestion that muscle fibres subjected to eccentric contractions adapt to unaccustomed activity by the addition of new sarcomeres.

  • 4534.
    Yu, Ji-Guo
    et al.
    Umeå University, Faculty of Medicine, Department of Surgical and Perioperative Sciences, Sports Medicine.
    Liu, Jing-Xia
    Umeå University, Faculty of Medicine, Department of Integrative Medical Biology (IMB), Anatomy.
    Carlsson, Lena
    Umeå University, Faculty of Medicine, Department of Integrative Medical Biology (IMB), Anatomy.
    Thornell, Lars-Eric
    Umeå University, Faculty of Medicine, Department of Integrative Medical Biology (IMB), Anatomy.
    Stål, Per S
    Umeå University, Faculty of Medicine, Department of Integrative Medical Biology (IMB), Anatomy.
    Re-evaluation of sarcolemma injury and muscle swelling in human skeletal muscles after eccentric exercise2013In: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 8, no 4, article id e62056Article in journal (Refereed)
    Abstract [en]

    The results regarding the effects of unaccustomed eccentric exercise on muscle tissue are often conflicting and the aetiology of delayed onset muscle soreness (DOMS) induced by eccentric exercise is still unclear. This study aimed to re-evaluate the paradigm of muscular alterations with regard to muscle sarcolemma integrity and fibre swelling in human muscles after voluntary eccentric exercise leading to DOMS. Ten young males performed eccentric exercise by downstairs running. Biopsies from the soleus muscle were obtained from 6 non-exercising controls, 4 exercised subjects within 1 hour and 6 exercised subjects at 2-3 days and 7-8 days after the exercise. Muscle fibre sarcolemma integrity, infiltration of inflammatory cells and changes in fibre size and fibre phenotype composition as well as capillary supply were examined with specific antibodies using enzyme histochemistry and immunohistochemistry. Although all exercised subjects experienced DOMS which peaked between 1.5 to 2.5 days post exercise, no significant sarcolemma injury or inflammation was detected in any post exercise group. The results do not support the prevailing hypothesis that eccentric exercise causes an initial sarcolemma injury which leads to subsequent inflammation after eccentric exercise. The fibre size was 24% larger at 7-8 days than at 2-3 days post exercise (p<0.05). In contrast, the value of capillary number per fibre area tended to decrease from 2-3 days to 7-8 days post exercise (lower in 5 of the 6 subjects at 7-8 days than at 2-3 days; p<0.05). Thus, the increased fibre size at 7-8 days post exercise was interpreted to reflect fibre swelling. Because the fibre swelling did not appear at the time that DOMS peaked (between 1.5 to 2.5 days post exercise), we concluded that fibre swelling in the soleus muscle is not directly associated with the symptom of DOMS.

  • 4535.
    Yu, Ji-Guo
    et al.
    Umeå University, Faculty of Medicine, Department of Surgical and Perioperative Sciences, Sports Medicine.
    Malm, Christer
    Umeå University, Faculty of Medicine, Department of Surgical and Perioperative Sciences, Sports Medicine.
    Thornell, Lars-Eric
    Umeå University, Faculty of Medicine, Department of Integrative Medical Biology (IMB), Anatomy.
    Eccentric contractions leading to DOMS do not cause loss of desmin nor fibre necrosis in human muscle.2002In: Histochemistry and Cell Biology, ISSN 0948-6143, E-ISSN 1432-119X, Vol. 118, no 1, p. 29-34Article in journal (Refereed)
    Abstract [en]

    High force eccentric muscle contractions can result in delayed onset muscle soreness (DOMS), prolonged loss of muscle strength, decreased range of motion, muscle swelling and an increase of muscle proteins in the blood. At the ultrastructural level Z-line streaming and myofibrillar disruptions have been taken as evidence for muscle damage. In animal models of eccentric exercise-induced injury, disruption of the cytoskeleton and the sarcolemma of muscle fibres occurs within the first hour after the exercise, since a rapid loss of staining of desmin, a cytoskeletal protein, and the presence of fibronectin, a plasma and extracellular protein, are observed within the muscle fibres. In the present study, biopsies from subjects who had performed different eccentric exercises and had developed DOMS were examined. Our aim was to determine whether eccentric exercise leading to DOMS causes sarcolemmal disruption and loss of desmin in humans. Our study shows that even though the subjects had DOMS, muscle fibres had neither lost staining for desmin nor contained plasma fibronectin. This study therefore does not support previous conclusions that there is muscle fibre degeneration and necrosis in human skeletal muscle after eccentric exercise leading to DOMS. Our data are in agreement with the recent findings that there is no inflammatory response in skeletal muscle following eccentric exercise in humans. In combination, these findings should stimulate the search for other mechanisms explaining the functional and structural alterations in human skeletal muscle after eccentric exercise.

  • 4536.
    Yu, Ji-Guo
    et al.
    Umeå University, Faculty of Medicine, Department of Surgical and Perioperative Sciences, Sports Medicine.
    Russell, Brenda
    Cardiomyocyte remodeling and sarcomere addition after uniaxial static strain in vitro.2005In: J Histochem Cytochem, ISSN 0022-1554, Vol. 53, no 7, p. 839-44Article in journal (Refereed)
  • 4537.
    Yu, Ji-Guo
    et al.
    Umeå University, Faculty of Medicine, Department of Surgical and Perioperative Sciences, Sports Medicine.
    Sewright, Kimberly
    Hubal, Monica
    Liu, Jing-Xia
    Umeå University, Faculty of Medicine, Department of Integrative Medical Biology (IMB), Anatomy.
    Schwartz, Lawrence
    Hoffman, Eric
    Clarkson, Priscilla
    Investigation of gene expression in C(2)C(12) Myotubes following simvastatin application and mechanical strain2009In: Journal of Atherosclerosis and Thrombosis, ISSN 1880-3873, E-ISSN 1340-3478, Vol. 16, no 1, p. 21-29Article in journal (Refereed)
    Abstract [en]

    Aim: The 3-hydroxy-3methylgutaryl coenzyme A (HMG-CoA) reductase inhibitors (statins) are the most effective prescribed drugs for lowering serum cholesterol; however, although statins are extremely safe medications and have brought significant benefits to patients with hypercholesterolemia, they have been shown to produce myalgia, cramps, exercise intolerance and fatigue. The aim of the study was to investigate the molecular mechanisms that may mediate statin myopathy.

    Methods: We used DNA microarray analysis to examine the changes in gene expression profiles induced by 1 hour and 6 hours of statin treatment on differentiated C(2)C(12) myotubes. Four genes were selected for analysis at the protein level using Western blot analysis on myotubes treated with statin with or without additional mechanical stretching.

    Results: Eighty-five genes exhibited more than a 2-fold up- or down-regulation in expression, of which 46 have known biological functions related primarily to transmembrane transport, signal transduction, cell growth/maintenance, protein metabolism, or apoptosis. At protein level, three of the four proteins were induced (Adrb1, Socs4 and Cflar) and one was repressed (Birc4). Changes in protein expression largely mirrored the changes in their corresponding transcripts, although the fold-change was less dramatic. The addition of imposed muscle fiber stretching did not exacerbate the expression of these genes at the protein level with the exception of Cflar, a pro-apoptotic protein.

    Conclusion: These data suggested that alterations in the expressions of some statin-regulated genes could be causative factors for statin toxicity in muscle. Repression of the anti-apoptosis gene (Birc4) and activation of the pro-apoptosis gene (Cflar) indicated that cell death may play an important role in statin-induced myopathy.

  • 4538.
    Yu, Ji-Guo
    et al.
    Umeå University, Faculty of Medicine, Department of Surgical and Perioperative Sciences, Sports Medicine.
    Sun, Gaofeng
    Dept. Physical Education, Yantai Teacher's University.
    Zhang, Benqiang
    Dept. Physical Education, Yantai Teacher's University.
    Exercise training and Blood Volume1995In: Journal of Shandong Physical Education Institute, ISSN 1006-2076, Vol. 11, no 1, p. 31-35Article, review/survey (Refereed)
    Abstract [en]

    Both an acute sport and long-term exercise can result in changes in blood volume.Studying these changes, finding their changing patterns and knowing their effects on sport ability have been the problems of a lot of reserchers. In this review. previous works of other peoples were reviewed and analysed in order to provide a clue forfurther studies.

  • 4539.
    Yu, Ji-Guo
    et al.
    Umeå University, Faculty of Medicine, Department of Surgical and Perioperative Sciences, Sports Medicine.
    Thornell, Lars-Eric
    Umeå University, Faculty of Medicine, Department of Integrative Medical Biology (IMB), Anatomy.
    Desmin and actin alterations in human muscles affected by delayed onset muscle soreness: a high resolution immunocytochemical study.2002In: Histochemistry and Cell Biology, ISSN 0948-6143, E-ISSN 1432-119X, Vol. 118, no 2, p. 171-9Article in journal (Refereed)
    Abstract [en]

    Lack of staining for desmin in muscles in animal models of eccentric exercise has been suggested to reflect disruption of the desmin intermediate filament network and proposed to cause disruption of the myofibrillar apparatus and deterioration of muscle fibers. In a recent study, we examined muscle biopsies from persons who had performed different eccentric exercise protocols, which induced delayed onset muscle soreness (DOMS). We were unable to verify that loss of staining for desmin was a feature of sore muscles. Nevertheless, we observed changes in the desmin cytoskeleton, but the meaning of the observations was not conclusive. In the present study, a high resolution immunocytochemical method was used to investigate the changes of desmin and actin in human muscles following a bout of eccentric exercise that lead to DOMS 2-3 days post-exercise. Biopsies were taken before exercise and 1 h and 2-3 and 7-8 days after exercise. Phalloidin, a ligand that labels filamentous actin, and anti-desmin antibodies were used to stain semithin (approximately 0.5 micro m) cryosections. At 1 h post-exercise, the staining of actin and desmin did not differ from the controls, whereas in biopsies taken 2-3 and 7-8 days after exercise, 12.5% (SD 5.8%) and 6.1% (SD 2.3%) fibers showed areas of increased staining for actin. Corresponding values for fibers with increased staining for both actin and desmin were 8.7% (SD 3.9%) and 11.4% (SD 4.6%), respectively. We suggest that the increased staining of actin and desmin reflects an increased synthesis of these proteins as part of an adaptation process following the unaccustomed eccentric exercise.

  • 4540.
    Yu, Ji-Guo
    et al.
    Umeå University, Faculty of Medicine, Department of Surgical and Perioperative Sciences, Sports Medicine.
    Xu, Haowen
    Dept. Physical Education, East China Normal University, Shanghai, China.
    Destructive effects of exercise-induced lipid peroxidation on erythrocyte1994In: Sport Science, ISSN 1000-677X, Vol. 14, no 6, p. 67-72Article in journal (Refereed)
  • 4541.
    Yu, Ji-Guo
    et al.
    Umeå University, Faculty of Medicine, Department of Surgical and Perioperative Sciences, Sports Medicine.
    Zhu, Tiquan
    Dept. Physical Education, Yantai Teacher's University, Yantai, China.
    Zhou, Shizhang
    Yantai Yu-Huang-Ding Hospital,Yantai, China .
    Ginseng and Astragalus supplementation improves aerobic capacity in humans1994In: YANTAI TEACHERS COLLEGE JOURNAL, ISSN 1673-8020, Vol. 10, no 2, p. 129-133Article in journal (Refereed)
    Abstract [en]

    Shen-Qi preparation containing ginseng and astragalus as main ingredients was taken by twelve sportsmen during six weeks running training. The aerobic capacity of the sportsmen, strength and accumulation of lactic acid in the blood were examined. The results showed that lactic acid can be cleaned up faster in the period of recovery, and BUN level was lower after a long time running in the subjects.

  • 4542.
    Zafar, Hamayun
    et al.
    Umeå University, Faculty of Medicine, Department of Odontology. King Saud Univ, Coll Appl Med Sci, Dept Rehabil Sci, Riyadh, Saudi Arabia.
    Alghadir, Ahmad
    Anwer, Shahnawaz
    Al-Eisa, Einas
    Therapeutic Effects of Whole-Body Vibration Training in Knee Osteoarthritis: A Systematic Review and Meta-Analysis2015In: Archives of Physical Medicine and Rehabilitation, ISSN 0003-9993, E-ISSN 1532-821X, Vol. 96, no 8, p. 1525-1532Article, review/survey (Refereed)
    Abstract [en]

    Objective: To examine the current evidence regarding the effects of whole-body vibration (WBV) training in individuals with knee osteoarthritis (OA). Data Sources: We searched PubMed, CINAHL, Embase, Scopus, Physiotherapy Evidence Database (PEDro), and Science Citation Index for research articles published prior to January 2015 using the keywords whole body vibration, vibration training, and vibratory exercise in combination with the Medical Subject Heading osteoarthritis knee. Study Selection: This meta-analysis was restricted to randomized controlled trials published in the English language. The quality of the selected studies was assessed by the PEDro Scale. The risk of bias was assessed using the Cochrane collaboration's tool in the domain-based evaluation. We also evaluated the quality of each study based on the criteria given by the International Society of Musculoskeletal and Neuronal Interactions for reporting WBV intervention studies, consisting of 13 factors. Data Extraction: Descriptive data regarding subjects, design, intervention, WBV parameters, outcomes, and conclusions were collected from each study by 2 independent evaluators. The mean and SD of the baseline and final endpoint scores for pain, stiffness, and function were extracted from the included studies. Data Synthesis: A total of 83 studies were found in the search. Of these, 5 studies met the inclusion criteria and were further analyzed. Four of these 5 studies reached high methodologic quality on the PEDro Scale. Overall, studies demonstrated mixed results in favor of additive effects of WBV for reducing pain and improving function in knee OA. There was considerable variation in the parameters of the WBV included in this systematic review. Conclusions: WBV training reduces pain and improves function in individuals with knee OA.

  • 4543.
    Zakaria, Pascal
    Swedish School of Sport and Health Sciences, GIH, Department of Sport and Health Sciences.
    Whole-body kinematics during paddling on kayak ergometer in elite able-bodied athletes: a first step to develop a classification for para-kayak athletes2014Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Aim

    The purpose of the study was to define three dimensional range of motion for all major joints (wrist, elbow, shoulder, trunk, pelvis, hip, knee, and ankle) in a group of able-bodied elite canoeists during paddling on a kayak ergometer. An additional purpose was to analyze if the range of motion changed with increased intensity and if there were any differences between body sides during paddling on the ergometer.

    Method

    Ten elite athletes (four women and six men) volunteered for the study (22 ± 3.5 years, 78.3 ± 10.2 kg, 1.79 ± 0.06 m). Three-dimensional kinematic data was recorded using an optoelectronic system and twelve cameras were placed in a circle around the ergometer. Fifty-four reflective markers were attached on the subject and 14 body segments were defined in the model used in the analysis to evaluate range of motion for each joint. Kinematic and force data were collected during paddling on the kayak ergometer at incremental intensities starting at 50 W ("Low") and increased with 50 W until the athlete was not able to hold the predetermined level ("Submaximal"). The participants were asked to maintain each intensity level as stable as possible during at least 20 kayak cycles, i.e. approximately 60 sec during the lowest intensity level. Finally, a maximal test was performed ("Maximal"). Mean values of 10 stroke cycles were used in the statistics.

    Result

    The mean range of motion was for shoulder flexion; 3 – 101°, shoulder abduction; 9–53°, shoulder inward/outward rotation; 39–51°, elbow flexion; 13–118°, wrist palmar/dorsiflexion; 9–31°, wrist radial/ulnar deviation; 9–22°, trunk flex/extension; 8 –1°, trunk rotation left/right; 24–24, trunk lateral bending right/left; 7 – 8°, hip flexion 85-116°, knee flexion; 7–56° and foot flexion 64–91°. When intensity increased the range of motion significantly increased in peak joint angle for shoulder flexion, shoulder inward rotation, trunk- , hip-, knee- and foot flexion. In general, there were no significant differences observed between left and right side for maximal and minimal range of motion.

    Conclusion

    The results from this kinematic study can be used as adequate reference values in the development for an evidence-based classification system for para-canoeists.

  • 4544.
    Zeisig, Eva
    et al.
    Umeå University, Faculty of Medicine, Department of Surgical and Perioperative Sciences, Sports Medicine.
    Fahlström, Martin
    Umeå University, Faculty of Medicine, Department of Community Medicine and Rehabilitation, Rehabilitation Medicine. Umeå University, Faculty of Medicine, Department of Surgical and Perioperative Sciences, Sports Medicine.
    Öhberg, Lars
    Umeå University, Faculty of Medicine, Department of Radiation Sciences, Diagnostic Radiology.
    Alfredson, Håkan
    Umeå University, Faculty of Medicine, Department of Surgical and Perioperative Sciences, Sports Medicine.
    A 2-year sonographic follow-up after intratendinous injection therapy in patients with tennis elbow2010In: British Journal of Sports Medicine, ISSN 0306-3674, E-ISSN 1473-0480, Vol. 44, no 8, p. 584-587Article in journal (Refereed)
    Abstract [en]

    Background Tennis elbow is a tendinopathy affecting the upper extremity. Recent studies have shown high sensitivity for ultrasound (US) examination and high specificity for colour Doppler (CD) examination. There are no mid- or long-term follow-up investigations of the tendon structure and blood flow using these techniques.

    Objective To use US and CD to study structure and blood flow in the extensor origin in patients with tennis elbow treated with intratendinous injections.

    Design Follow-up study

    Setting Sports Medicine Unit, Umeå University.

    Patients 25 patients (28 elbows), mean age 46 years (range 27–66), treated with intratendinous injections due to chronic pain from tennis elbow.

    Method US and CD examination of the extensor origin was carried out at inclusion and at follow-up two years after intratendinous injection treatment with polidocanol and/or a local anaesthetic.

    Main outcome measurements US (structure) and CD (blood flow) findings.

    Results All patients had structural tendon changes and high blood flow at inclusion when given the injection treatment. At the two-year follow-up, structural tendon changes were seen in 20/28 elbows and high blood flow was seen in 4/28 elbows. The majority of patients with a good clinical result after treatment had no visible blood flow (17/20), but the structural changes showed no relation to a good result (13/20 remaining changes).

    Conclusions Doppler findings, but not structure, might be related to the clinical result after intratendinous injection treatment of tennis elbow.

  • 4545.
    Zeisig, Eva
    et al.
    Umeå University, Faculty of Medicine, Department of Surgical and Perioperative Sciences, Sports Medicine.
    Fahlström, Martin
    Umeå University, Faculty of Medicine, Department of Community Medicine and Rehabilitation, Rehabilitation Medicine.
    Öhberg, Lars
    Umeå University, Faculty of Medicine, Department of Radiation Sciences, Diagnostic Radiology.
    Alfredson, Håkan
    Umeå University, Faculty of Medicine, Department of Surgical and Perioperative Sciences, Sports Medicine.
    Pain relief after intratendinous injections in patients with tennis elbow: results of a randomised study2008In: British Journal of Sports Medicine, ISSN 0306-3674, E-ISSN 1473-0480, Vol. 42, no 4, p. 267-271Article in journal (Refereed)
  • 4546.
    Zenic, Natasa
    et al.
    Univ Split, Fac Kinesiol, Split, Croatia..
    Ostojic, Ljerka
    Univ Split, Fac Kinesiol, Split, Croatia.;Univ Mostar, Mostar, Bosnia & Herceg.;Acad Med Sci Bosnia & Herzegovina, Sarajevo, Bosnia & Herceg..
    Sisic, Nedim
    Univ Split, Fac Kinesiol, Split, Croatia..
    Pojskic, Haris
    Mid Sweden University, Faculty of Human Sciences, Department of Health Sciences.
    Peric, Mia
    Univ Split, Fac Kinesiol, Split, Croatia..
    Uljevic, Ognjen
    Univ Split, Fac Kinesiol, Split, Croatia..
    Sekulic, Damir
    Univ Split, Fac Kinesiol, Split, Croatia.; Univ Dept Hlth Care Studies, Split, Croatia..
    Examination of the community-specific prevalence of and factors associated with substance use and misuse among Rural and Urban adolescents: a cross-sectional analysis in Bosnia and Herzegovina2015In: BMJ Open, ISSN 2044-6055, E-ISSN 2044-6055, Vol. 5, no 11, article id e009446Article in journal (Refereed)
    Abstract [en]

    Objective: The community of residence (ie, urban vs rural) is one of the known factors of influence on substance use and misuse (SUM). The aim of this study was to explore the community-specific prevalence of SUM and the associations that exist between scholastic, familial, sports and sociodemographic factors with SUM in adolescents from Bosnia and Herzegovina. Methods: In this cross-sectional study, which was completed between November and December 2014, the participants were 957 adolescents (aged 17 to 18 years) from Bosnia and Herzegovina (485; 50.6% females). The independent variables were sociodemographic, academic, sport and familial factors. The dependent variables consisted of questions on cigarette smoking and alcohol consumption. We have calculated differences between groups of participants (gender, community), while the logistic regressions were applied to define associations between the independent and dependent variables. Results: In the urban community, cigarette smoking is more prevalent in girls (OR= 2.05; 95% CI 1.27 to 3.35), while harmful drinking is more prevalent in boys (OR= 2.07; 95% CI 1.59 to 2.73). When data are weighted by gender and community, harmful drinking is more prevalent in urban boys (OR= 1.97; 95% CI 1.31 to 2.95), cigarette smoking is more frequent in rural boys (OR= 1.61; 95% CI 1.04 to 2.39), and urban girls misuse substances to a greater extent than rural girls (OR= 1.70; 95% CI 1.16 to 2.51, OR= 2.85; 95% CI 1.88 to 4.31, OR= 2.78; 95% CI 1.67 to 4.61 for cigarette smoking, harmful drinking and simultaneous smoking-drinking, respectively). Academic failure is strongly associated with a higher likelihood of SUM. The associations between parental factors and SUM are more evident in urban youth. Sports factors are specifically correlated with SUM for urban girls. Conclusions: Living in an urban environment should be considered as a higher risk factor for SUM in girls. Parental variables are more strongly associated with SUM among urban youth, most probably because of the higher parental involvement in children' personal lives in urban communities (ie, college plans, for example). Specific indicators should be monitored in the prevention of SUM.

  • 4547.
    Zervas, Yannis
    et al.
    University of Athens, Greece.
    Stambulova, Natalia
    Halmstad University, School of Social and Health Sciences (HOS), Centre of Research on Welfare, Health and Sport (CVHI).
    Physical activity and cognitive functioning1999In: Psychology for physical educators / [ed] Yves Vanden Auweele, Frank Bakker, Stuart Biddle, Marc Durand, Roland Seiler, Champaign, IL: Human Kinetics , 1999, p. 135-154Chapter in book (Other academic)
  • 4548.
    Zetterlund, Hanna
    University of Gävle, Faculty of Education and Business Studies, Department of Educational sciences.
    "Alla ska få vara med på båten": En kvalitativ studie om hur föreningar arbetar med inkludering för att främja mångfald2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Mångfald är något som svenska idrottsföreningar strävar efter, eftersom det ger goda effekter på samhället och gemenskapen bland alla individer. Syftetmed denna studie är att undersöka hur idrottsföreningar arbetar med inkludering för att främja mångfald. Som metod i studien användes semistruktureradeintervjuer för att kunna undersöka hur föreningarna tänker och resonerar kring inkluderingsarbetetoch det gjordes med ett målstyrt urval där 6 föreningar deltog i studien. Resultatetsom visades var att alla föreningar arbetar med inkludering på ett eller annat sätt och att det finns olika hinder som varje förening handskas med. Slutsatsenman kan dra ifrån detta är att många föreningar vill och kan arbeta med inkludering i föreningar men att det finns olika problematik kring hur man kan göra det. Vissa har större problem med att få in flickor medan andra har mer problem med att rekrytera nyanlända. Detta arbete är en viktig grund för eventuell vidare forskning.

  • 4549.
    Zinner, C.
    et al.
    Univ Wurzburg, Dept Sport Sci, Judenbuhlweg 11, D-97082 Wurzburg, Germany.
    Krueger, M.
    German Sport Univ Cologne, Inst Training Sci & Sport Informat, Sportpk Mungersdorf 6, D-50933 Cologne, Germany.
    Reed, J. L.
    Univ Ottawa, Fac Hlth Sci, Ottawa, ON K1N 6N5, Canada.
    Kohl-Bareis, M.
    Univ Appl Sci Koblenz, RheinAhrCampus Remagen, Landau, Germany.
    Holmberg, Hans-Christer
    Mid Sweden University, Faculty of Human Sciences, Department of Health Sciences.
    Sperlich, Billy
    Mid Sweden University, Faculty of Human Sciences, Department of Health Sciences. Univ Wurzburg, Dept Sport Sci, Judenbuhlweg 11, D-97082 Wurzburg, Germany.
    Exposure to a combination of heat and hyperoxia during cycling at submaximal intensity does not alter thermoregulatory responses2016In: Biology of Sport, ISSN 0860-021X, E-ISSN 2083-1862, Vol. 33, no 1, p. 71-76Article in journal (Refereed)
    Abstract [en]

    In this study, we tested the hypothesis that breathing hyperoxic air (FinO2 = 0.40) while exercising in a hot environment exerts negative effects on the total tissue level of haemoglobin concentration (tHb); core (T-core) and skin (T-skin) temperatures; muscle activity; heart rate; blood concentration of lactate; pH; partial pressure of oxygen (PaO2) and carbon dioxide; arterial oxygen saturation (SaO2); and perceptual responses. Ten well-trained male athletes cycled at submaximal intensity at 21 degrees C or 33 degrees C in randomized order: first for 20 min while breathing normal air (FinO2 = 0.21) and then 10 min with FinO2 = 0.40 (HOX). At both temperatures, SaO2 and PaO2, but not tHb, were increased by HOX. Tskin and perception of exertion and thermal discomfort were higher at 33 degrees C than 21 degrees C (p < 0.01), but independent of FinO2. Tcore and muscle activity were the same under all conditions (p > 0.07). Blood lactate and heart rate were higher at 33 degrees C than 21 degrees C. In conclusion, during 30 min of submaximal cycling at 21 degrees C or 33 degrees C, T-core, T-skin and T-body, tHb, muscle activity and ratings of perceived exertion and thermal discomfort were the same under normoxic and hyperoxic conditions. Accordingly, breathing hyperoxic air (FinO2 = 0.40) did not affect thermoregulation under these conditions.

  • 4550.
    Zinner, Christoph
    et al.
    Julius Maximilians Univ Wurzburg, Dept Sport Sci, Integrat & Expt Training Sci, Wurzburg, Germany.
    Baessler, Bettina
    Univ Hosp Cologne, Dept Radiol, Cologne, Germany.
    Weiss, Kilian
    Univ Hosp Cologne, Dept Radiol, Cologne, Germany; Philips Healthcare Germany, Hamburg, Germany.
    Ruf, Jasmine
    Univ Hosp Cologne, Dept Radiol, Cologne, Germany.
    Michels, Guido
    Univ Cologne, Dept Internal Med 3, Cologne, Germany.
    Holmberg, Hans-Christer
    Mid Sweden University, Faculty of Human Sciences, Department of Health Sciences. Univ British Columbia, Sch Kinesiol, Vancouver, BC, Canada.
    Sperlich, Billy
    Julius Maximilians Univ Wurzburg, Dept Sport Sci, Integrat & Expt Training Sci, Wurzburg, Germany.
    Effect of resistance training with vibration and compression on the formation of muscle and bone2017In: Muscle and Nerve, ISSN 0148-639X, E-ISSN 1097-4598, Vol. 56, no 6, p. 1137-1142Article in journal (Refereed)
    Abstract [en]

    IntroductionIn this study we investigated the effects of resistance training with vibration in combination with leg compression to restrict blood flow on strength, muscle oxygenation, muscle mass, and bone formation. MethodsTwelve participants were tested before and after 12 weeks of resistance training with application of vibration (VIBRA; 1-2mm, 30Hz) to both legs and compression (approximate to 35mm Hg, VIBRA+COMP) to only 1 leg. ResultsVIBRA+COMP and VIBRA improved 1 repetition maximum (1-RM), increased the number of repetitions preceding muscle exhaustion, enhanced cortical bone mass, and lowered the mass and fat fraction in the thigh, with no changes in total muscle mass. The mass of cancellous bone decreased to a similar extent after VIBRA and VIBRA+COMP. DiscussionResistance training with VIBRA+COMP and VIBRA improved 1-RM, increased the number of repetitions preceding muscular exhaustion, and enhanced formation of cortical bone, with no alteration of muscle mass. 

888990919293 4501 - 4550 of 4628
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf