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Skeletal muscle fiber‐type distribution and habitual physical activity in daily life
Author(s) -
Den Hoed M.,
Hesselink M. K. C.,
Westerterp K. R.
Publication year - 2009
Publication title -
scandinavian journal of medicine and science in sports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.575
H-Index - 115
eISSN - 1600-0838
pISSN - 0905-7188
DOI - 10.1111/j.1600-0838.2008.00782.x
Subject(s) - skeletal muscle , muscle fibre , myosin , physical activity , physical therapy , medicine , psychology , physical medicine and rehabilitation , chemistry , biochemistry
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.