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Biomechanical Adaptations and Performance Indicators in Short Trail Running
Mid Sweden Univ, Dept Hlth Sci, Swedish Winter Sports Res Ctr, Ostersund, Sweden.;Swedish Sports Confederat, Stockholm, Sweden..
KTH, Skolan för teknikvetenskap (SCI).ORCID-id: 0000-0001-5234-6554
Swiss Fed Inst Sport, Dept Elite Sport, Magglingen, Switzerland..
Univ Salzburg, Dept Sport & Exercise Sci, Salzburg, Austria..
2019 (engelsk)Inngår i: Frontiers in Physiology, ISSN 1664-042X, E-ISSN 1664-042X, Vol. 10, artikkel-id 506Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Our aims were to measure anthropometric and oxygen uptake ((V)over dot O-2) variables in the laboratory, to measure kinetic and stride characteristics during a trail running time trial, and then analyse the data for correlations with trail running performance. Runners (13 men, 4 women: mean age: 29 +/- 5 years; stature: 179.5 +/- 0.8 cm; body mass: 69.1 +/- 7.4 kg) performed laboratory tests to determine (V)over dot O-2 (max), running economy (RE), and anthropometric characteristics. On a separate day they performed an outdoor trail running time trial (two 3.5 km laps, total climb: 486 m) while we collected kinetic and time data. Comparing lap 2 with lap 1 (19:40 +/- 1:57 min vs. 21:08 +/- 2:09 min, P < 0.001), runners lost most time on the uphill sections and least on technical downhills (-2.5 +/- 9.1 s). Inter-individual performance varied most for the downhills (CV > 25%) and least on flat terrain (CV < 10%). Overall stride cycle and ground contact time (GCT) were shorter in downhill than uphill sections (0.64 +/- 0.03 vs. 0.84 +/- 0.09 s; 0.26 +/- 0.03 vs. 0.46 +/- 0.90 s, both P < 0.001). Force impulse was greatest on uphill (248 +/- 46 vs. 175 +/- 24 Ns, P < 0.001) and related to GCT (r = 0.904, P < 0.001). Peak force was greater during downhill than during uphill running (1106 +/- 135 vs. 959 +/- 104 N, P < 0.01). Performance was related to absolute and relative (V)over dot O-2 (max) (P < 0.01), vertical uphill treadmill speed (P < 0.001) and fat percent (P < 0.01). Running uphill involved the greatest impulse per step due to longer GCT while downhill running generated the highest peak forces. (V)over dot O-2 (max), vertical running speed and fat percent are important predictors for trail running performance. Performance between runners varied the most on downhills throughout the course, while pacing resembled a reversed J pattern. Future studies should focus on longer competition distances to verify these findings and with application of measures of 3D kinematics.

sted, utgiver, år, opplag, sider
Frontiers Media S.A., 2019. Vol. 10, artikkel-id 506
Emneord [en]
downhill running, foot forces, ground contact time, pacing, stride frequency
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-251708DOI: 10.3389/fphys.2019.00506ISI: 000466549100002Scopus ID: 2-s2.0-85068357933OAI: oai:DiVA.org:kth-251708DiVA, id: diva2:1316660
Merknad

QC 20190520

Tilgjengelig fra: 2019-05-20 Laget: 2019-05-20 Sist oppdatert: 2019-10-04bibliografisk kontrollert

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