Blood flow of the thigh and calf in both of the right and left legs were measured simultaneously before and immediately after rhythmic exercise of dorsi-flection of the ankle joint with mercury-in-rubber strain gauge venous occlusion plethysmography. The rhythmic exercise of dorsi-flection on the ankle joint of the right leg was performed by the electrical stimulator for 5 min.
The mean values (standard deviation) of resting blood flow of the thigh and calf were 4.2 (1.3) and 3.8 (2.4) ml/100ml·min for the right leg, and 4.2 (1.2) and 3.8 (1.6) ml/100ml·min for the left leg, respectively. The difference in resting values for the two legs was not significant.
The calf blood flow of right leg (active part) immediately after exercise was increased for about 3 times compared with resting value (P<0.01) . On the other hand, no significant change in blood flow immediately after rhythmic exercise was observed in the non-active parts (right thigh, left thigh and calf) .

Forearm blood flow in three male and one female subjects were determined with a mercury-in-rubber strain gauge venous occlusion plethysmography before, during and after rhythmic hand-grip exercise. The hand-grip exercise was performed on a hand-ergometer with the load of 5, 10, 20 and 30% of maximal voluntary contraction (MVC) of each subject, at the rate of 60 contractions/min as timed with a metronome.
The following results were obtained;
1) The forearm blood flow during rhythmic exercise at the tension of 5% MVC increased as soon as the exercise started and reached a steady state in apporoximately 1 min.
2) The forearm blood flow during rhythmic exercise at the tension of 10% MVC did not reach a steady level during 3 min exercise.
3) The forearm blood flow during rhythmic exercise at tensions of 20 and 30% MVC were increased steadily throughout the hand-grip exercise.
4) The forearm blood flow determined immediately before stopping the exercise and immediately after exercise at tensions of 5 and 10% MVC were apporoximately the same.
5) The blood flow in the forearm determined immediately before stopping the rhythmic exercise at tensions of 20 and 30% MVC were lower than the blood flow immediately after exercise.
6) From these results, it was concluded that the blood flow requirement of muscles during the rhythmic hand-grip exercise at tensions up to 10% MVC can adequately be supplied. Therefore, the rhythmic exercise at tensions up to 10% MVC can keep up for a very long time without fatigue.

Blood flow and volume change of the thigh were measured in six healthy male subjects in bicycle exercise at varying work rates. Mercury-in-rubber strain gauge plethysmograph technique was used to determin the blood flow and volume change of the thigh.
The thigh blood flow immediately after exercise reached an average of 16.7 ml/ 100 ml⋅min when the work load was 30 watt. It rose progressively with the intensity of the exercise so as to attain 24, 8, 39.4 and 44.4 ml/100 ml⋅min at 60, 120 and 180 watt, respectively.
The thigh volume immediately before stopping the exercise at 30, 60, 120 and 180 watt were 2. 53, 2. 86, 3.68 and 4.33 ml/100 m, min respectively. Furthermore, there are close relationship between the thigh volume immediately before stopping the exercise and the thigh blood flow immediately after exrcise with being statistically significant (r=0.76, P<0.001) .

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 hand-grip 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.

Muscular endurance and blood flow of the forearm were measured in 65 healthy male and 53 healthy female subjects, all aged 19-75 years. Muscular endurance was measured using a hand-ergometer with a load equal to 1/3 of the maximum grip-strength of the subject. The blood flow in the forearm was determined before and immediately after exercise using mercury-in-rubber strain-gauge venous occlusion plethysmography.
The following results were obtained
1) The muscular endurance of both the male and female subjects was observed to increase with age (p<0.05) .
2) The forearm blood flow before exercise by the male and female participants was did not change with age (p>0.05) . However, the forearm blood flow immediately after exercise showed a tendency to increase with age in both groups (p<0.05) .
3) A close relationship was found between muscular endurance and forearm blood flow immediately after exercise in both the male group (r=0.584, p<0.001) and the female group (r=0.776, p<0.001) .
4) In forearm blood flow (both before and immediately after exercise) and muscular endurance, differences between male and female subjects in the same age group were not significant (p>0.05) .
5) These results agree with some of the changes seen in the morphorogical muscle characteristics with aging.