静的運動中における筋酸素動態とその評価

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The aim of this study was to estimate the oxygen availability during isometric exercise at varying intensities under the arterial occlusion and the non-occlusion. Seven male subjects were tested for changes in muscle oxygenation(MO_2)at rest and during exercise. Sustained isometric contractions were performed at intensity level of 10%, 30%, and 50% of maximum voluntary contraction(MVC)until exhaustion due to fatigue. The arterial occlusion was performed by placing a pneumatic cuff on the upper arm at a pressure of 280 mmHg. Continuous changes in MO_2 in forearm flexor muscle were measured by near infrared spectroscopy(NIRS). The MO_2 level was calculated by defining resting MO_2 as 100%, while MO_2 depletion as 0%. In the change of MO_2 during isometric exercise, a significant difference in between the arterial occlusion and the non-occlusion was only found in 10%MVC. From the changes of MO_2 level in exercise, the initial rate of MO_2 decline under each occlusion was calculated. The rates of initial decline of MO_2 in each occlusion were elevated with an increase exercise intensity. However, no significant difference was found in three intensities between the arterial occlusion and the non-occlusion. In comparison between rates of initial decline of MO_2 obtained with the arterial occlusion and the non-occlusion, the significant correlations were found in 10%(r=0.678, p<0.05), 30%(r=0.699, p<0.05)and 50% MVC(r=0.950, p<0.01). This result shows that the rates of initial decline of MO_2 in each intensity were very similar both in the arterial occlusion and the non-occlusion. Thus, this would suggest that the rates of initial decline of MO_2 without the use of arterial occlusion might reflected the rate of O_2 availability in muscle.
日本運動生理学会の論文
1999-07-30

静的運動中における筋酸素動態とその評価

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