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Skeletal muscle fiber-type distribution and habitual physical activity in daily life.
2009 (English)In: Scandinavian Journal of Medicine and Science in Sports, ISSN 0905-7188, E-ISSN 1600-0838, Vol. 19, no 3Article in journal (Refereed) Published
Abstract [en]

The capacity to perform physical activity largely depends on physical fitness. Muscle fiber-type distribution (Muscle(FTD)) is associated with physical fitness and may influence the capacity to perform physical activity. The purpose of this study was to determine whether habitual physical activity in daily life (PA(DL)) and Muscle(FTD) are related. Thirty-eight healthy non-athletes (31 women, 7 men) were recruited. PA(DL) was measured twice for 14 days using a tri-axial accelerometer for movement registration (Tracmor). From Tracmor output, the proportion of time subjects were physically active at low, moderate, and high intensities was determined (%Low, %Moderate, and %High, respectively). A total activity index (PA(index)) and sub-scores on work, leisure-time and sports were obtained using the Baecke questionnaire. Muscle(FTD) was determined using immuno-fluorescence against respective myosin heavy chain isoforms. No relationship was observed between PA(DL) and Muscle(FTD). %Low, %Moderate, and %High, as well as PA(index) and its sub-scores, were not related to Muscle(FTD) either. The time spent on sports was associated with the proportion of type I and II(X) fibers (P=0.06 and P<0.01, respectively). In conclusion, Muscle(FTD) probably cannot explain why some people are more prone to engaging in physical activities than others.

Place, publisher, year, edition, pages
2009. Vol. 19, no 3
National Category
Medical and Health Sciences
Identifiers
URN: urn:nbn:se:uu:diva-278397DOI: 10.1111/j.1600-0838.2008.00782.xPubMedID: 18384492OAI: oai:DiVA.org:uu-278397DiVA: diva2:906495
Available from: 2016-02-24 Created: 2016-02-24 Last updated: 2017-11-30

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den Hoed, M

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