長距離ランナーにおける酸素負債能と骨格筋線維の諸特性との関係

概要

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The purpose of this study was to determine alactic O_2 debt and lactic O_2 debt in long-distance renners, and to evaluate the relationship between the property of skeletal muscle fiber and O_2 debt capacity. Biopsy samples were taken from M. vastus lateralis of 13 long-distance runners, and analyzed for muscle fiber composition, capillary supply and SDH activity. O_2 debt capacity was measured on a treadmill running, and calculated for alactic O_2 debt and lactic O_2 debt. The results would be summarized as follows: Percentage of ST fibers, capillary density and SDH activity averaged 66.0 ± 0.4%, 274 ± 54/cm^2 and 6.38 ± 2.59 μmoles/g/min, respectively. The mean value for maximal O_2 debt was 8088 ± 1574/ml (135.2 ± 30.4 ml/kg), while alactic O_2 debt averaged 2316 ± 441 ml (38.4 ± 7.1 ml/kg) and lactic O_2 debt averaged 5772 ± 1574 ml (96.8 ± 29.7 ml/kg). The correlations between capillary density (/mm^2) and maximal,lactic 0_2 debt (ml, ml/kg) were significantly negative (r=0.616〜 -0.630, p<0.05). But the correlations between % ST; SDH activity and O_2 debt capacity (ml, ml/kg) were found to be not significant. The results of this study suggested that capillary density was a factor to regulate lactic O_2 debt and/or maximal O_2 debt in long-distance runners.
社団法人日本体育学会の論文
1991-09-01