アイソキネティック運動における運動速度と筋内酸素状態の関係

概要

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The present study investigated to clarify relationship between muscle oxygenation and various speed of isokinetic exercise by using near infrared spectroscopy. Muscle oxygenation level was estimated the integral area of oxygenated and deoxygenated hemoglobin content (oxy-Hb, deoxy-Hb) changes during isokinetic exercise of the thigh muscle. Five healthy male subjects took part in this study. The subjects performed ten repetitions of maximum voluntary knee flexion and extension at various angular velocities (0,30,60,120,180 and 240-deg/sec). The oxy-Hb and deoxy-Hb integral area per second at 0,30 and 60-deg/sec were higher than another speeds, and these values decreased at 60-deg/sec to 120-deg/sec. There were significant correlations between the peak torque and the oxy-Hb (r=0.920,p<0.01) and deoxy-Hb (r=0.947,p<0.01) integral area per minute. The difference between the integral area of oxy-Hb and deoxy-Hb at 0,30 and 60-deg/sec was larger than another exercise speeds, and in these differences at 120,180 and 240-deg/sec were slightly. It was considered that the restriction venouse blood flow and anoxic state occuring in the contracted muscle during isokinetic exercise at 0,30 and 60-deg/sec, although increasing O_2 demand. Further, these results suggest that a low speed and high number of repetitions in isokinetic exercise, and serial set with short rest periods caused a relatively long-term anoxic state of the muscle.
東海大学の論文