Summary
In order to determine the influence of an extensive history of participation in high intensity activity on muscle fiber type, fiber size, and metabolic profile, elite ice hockey players were selected for investigation from three different leagues. Biopsy samples from the vastus lateralis muscle were obtained from different groups of players prior to and following the season and compared with control subjects. No significant differences were found in the percentage (49.6 vs. 43.8%) or the size of the ST fibers between the elite athletes and the control group, nor was there any significant alteration following the season of play in these variables. For the FT fiber subgroups, a reduction in the FTb (12.2 vs. 3.9%) and an increase in FTa (38.0 to 45.2%) fiber populations occurred over the season. Similarly, increases in fiber area were observed for both FT subgroups pre to post season. Of the enzymes studied only 3-hydroxyacyl CoA dehydrogenase was elevated in the post season measures, while total phosphorylase and phosphofructokinase were significantly lower. The metabolic pattern exhibited does not appear to be substantially different from what would be expected from an untrained group of similar fiber distribution.
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This study was supported by grants from National Health and Welfare and the National Research Council
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Green, H.J., Thomson, J.A., Daub, W.D. et al. Fiber composition, fiber size and enzyme activities in vastus lateralis of elite athletes involved in high intensity exercise. Europ. J. Appl. Physiol. 41, 109–117 (1979). https://doi.org/10.1007/BF00421658
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DOI: https://doi.org/10.1007/BF00421658