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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

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

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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Accession: 006297753



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