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Aerobic capacity predict skeletal but not cardiac muscle damage after triathlon - the Iron(WO)man study.
Linnaeus University, Kalmar, Sweden..
Linnaeus University, Kalmar, Sweden..
Swedish School of Sport and Health Sciences, GIH, Department of Sport and Health Sciences. Linnaeus University, Kalmar, Sweden..ORCID iD: 0000-0001-6878-3142
Linnaeus University, Kalmar, Sweden..
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2020 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 10, no 1, article id 901Article in journal (Refereed) Published
Abstract [en]

This study examines the association between aerobic capacity and biomarkers of skeletal- and cardiac muscle damage among amateur triathletes after a full distance Ironman. Men and women (N = 55) were recruited from local sport clubs. One month before an Ironman triathlon, they conducted a 20 m shuttle run test to determine aerobic capacity. Blood samples were taken immediately after finishing the triathlon, and analyzed for cardiac Troponin T (cTnT), Myosin heavy chain-a (MHC-a), N-terminal prohormone of brain natriuretic peptide (NT-proBNP), Creatin Kinas (CK), and Myoglobin. Regression models examining the association between the biomarkers and aerobic capacity expressed in both relative terms (mLO2*kg-1*min-1) and absolute terms (LO2*min-1) controlled for weight were fitted. A total of 39 subjects (26% females) had complete data and were included in the analysis. No association between aerobic capacity and cardiac muscle damage was observed. For myoglobin, adding aerobic capacity (mLO2*kg-1*min-1) increased the adjusted r2 from 0.026 to 0.210 (F: 8.927, p = 0.005) and for CK the adjusted r2 increased from -0.015 to 0.267 (F: 13.778, p = 0.001). In the models where aerobic capacity was entered in absolute terms the adjusted r2 increased from 0.07 to 0.227 (F: 10.386, p = 0.003) for myoglobin and for CK from -0.029 to 0.281 (F: 15.215, p < 0.001). A negative association between aerobic capacity and skeletal muscle damage was seen but despite the well-known cardio-protective health effect of high aerobic fitness, no such association could be observed in this study.

Place, publisher, year, edition, pages
Nature Publishing Group, 2020. Vol. 10, no 1, article id 901
National Category
Sport and Fitness Sciences
Research subject
Medicine/Technology
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URN: urn:nbn:se:gih:diva-6011DOI: 10.1038/s41598-020-57842-wISI: 000512142100139PubMedID: 31965015OAI: oai:DiVA.org:gih-6011DiVA, id: diva2:1389178
Available from: 2020-01-29 Created: 2020-01-29 Last updated: 2020-03-16

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