Skeletal muscle determinants of maximum aerobic power in man |
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Authors: | J L Ivy D L Costill B D Maxwell |
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Institution: | (1) Human Performance Laboratory, Ball State University, 47306 Muncie, IN, USA;(2) Present address: Department of Preventive Medicine, Washington University School of Medicine, 63110 St. Louis, MO, USA |
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Abstract: | Summary The interrelationship between whole body maximum O2 uptake capacity (
O2 max), skeletal muscle respiratory capacity, and muscle fiber type were examined in 20 physically active men. The capacity of homogenates of vastus lateralis muscle biopsy specimes to oxidize pyruvate was significantly related to
O2 max (r=0.81). Correlations of 0.75 and 0.74 were found between % slow twitch fibers (%ST) and
O2 max, and between % ST fibers and muscle respiratory capacity, respectively (P<0.01). Multiple correlation analysis (R=0.85) indicated that 72% (R
2=0.72) of the variance in CO2 max could be accounted for by the combined effect of muscle respiratory capacity and the % ST fibers. When the % ST fibers was correlated with
O2 max, with the effect of respiratory capacity statistically removed, the relationship became insignificant (r=0.38). These data suggest that muscle respiratory capacity plays an important role in determining
O2 max, and that the relationship between % ST fibers and
O2 max is due primarily to the high oxidative capacity of this muscle fiber type.This research was supported by NIH grant (HL 20408-02) |
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Keywords: | Respiratory capacity % slow twitch fibers Maximum O2 consumption |
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