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The effects of 3 week training program (6 day a week) on the forearm blood flow before, during and after rhythmic hand-grip contraction on nineteen subjects was studied. The rhythmic hand-grip contraction was performed on a hand-ergometer with a load of 30% of maximum grip strength (M. G. S.) of each subjects, at a rate of 60 beats/min as time with metronome. The forearm blood flow before, during and after rhythmic handgrip exercise was determined with a mercury-in-rubber strain-gauge venous occlusion plethysmography. The following results were obtained; 1) The maximum grip strength did not change significantly before and after training. 2) The number of contraction (muscular endurance) up to exhaustion increased from 166.0 to 284.9 at the end of training (p<0.001). 3) The resting forearm blood flow did not change significantly during straining period. 4) The peak blood flow during exercise (p<0.01), the blood flow final minute of exercise (p<0.05) and the blood flow immediately after exercise (p<0.05) in the forearm increased significantly after training. 5) From these results, it is concluded that the muscular endurance training with a load of 30% M. G. S, increase the muscular endurance and blood flow during rhythmic hand-grip exercise. (J. Physical Fitness Japan 1986, 35 : 127•`133) key words:ト レ ー ニ ング,血 流量,筋 持 久 力

EFFECTS OF MUSCULAR ENDURANCE TRAINING ON FOREARM BLOOD FLOW DURING AND AFTER RHYTHMIC CONTRACTION