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Relationship between muscle fiber composition capillary supply oxidative enzyme activity and aerobic work capacity in middle and long distance runners

, : Relationship between muscle fiber composition capillary supply oxidative enzyme activity and aerobic work capacity in middle and long distance runners. Japanese Journal of Physical Fitness & Sports Medicine 35(4): 182-191

It was the purpose of this study to examine the property of skeletal muscle fiber in middle- and long-distance runners, and to evaluate the relationship between the property of skeletal muscle fiber and aerobic work capacity. Biopsy samples were taken from M. vastus lateralis of 23 middle- and long-distance runners, and analyzed for muscle fiber composition, capillary supply and SDH activity. Aerobic work capacity was measured on a treadmill with continuous method. The mean value for % ST in M. vastus lateralis was 61.3%, and the muscle fiber distribution showed the tendency of slow type. The cross-sectional area of ST and FT fibers ranged approximately from 3,000 .mu.m2 to 13,000 .mu.m2, and the cross-sectional area of ST fiber tended to be larger than that FT fiber. The mean values for CD, C/F ratio, and CC(/ST) as capillary supply were 279/mm2, 1.62 and 5.7, respectively. The mean value for SDH activity was 5.86 .mu.moles/g/min, and was lower than reported previously for elite tumors. In addition, SDH activity correlated with % ST and CC(/ST) (r=0.480, p < 0.05, r=0.640, p < 0.01). On the other hand, the mean value for .ovrhdot.VO2max was 68.5 ml/kg/min (4,066 ml/min), while .ovrhdot.VO2@AT averaged 45.9 ml/kg/min (2,756 ml/min). And it was fond that .ovrhdot.VO2max and .ovrhdot.VO2@AT correlated significantly with % ST, CC(/ST) and SDH activity. Particularly, .ovrhdot.VO2max was most strongly related to SDH activity (r=0.612, p < 0.01). The results of this study suggest that in regard to middle- and long-distance runners, structural characteristics of the ST fiber and capillary are some of the indispensable factors to regulate such a functional property as SDH activity and that the distinctive characteristics of the skeletal muscle fiber might possibly influence aerobic work capacity to a great extent.

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