The aim of this study was to investigate quantitatively the power ability of middle and older aged men in the vertical jump. And, we would try to point out the changes with increasing ages and the influences of the environments factor to the power ability. Based on the environment point of view, we put an emphasis and consideration on those who did physical exercises and also those who drove a car in a daily life. Subjects were the health 201 men who visited the sports sauna training center of national stadium for physical exercises. The power was calcurated from the force and velocity concerning of jumper's C.G. during the take off motion. The force was measured by using a strain gage type tranceducer, and the velocity was calcurated by integrating the equation of motion about of C.G. Result: The power ability of middle and older aged men in the vertical jump decreased with increasing ages. The rate of decrease with every 5 years of age was 0.248 horse power, 2.960×10-3 horse power in the maximum power and maximum power per body weight. In comparison with the power ability of 25 years old, the power ability, in terms of maximum power per body weight, of 35 years old, 45 years old, 55 years old were 90.8%, 81.1%, 59.0%, respectively. There were evidently differences between trained men and untrained men, and then car driver and no car driver in the power ability. The differences of maximum power per body weight were 12.190 × 10-3 horse power, 9.231×10-3 horse power, respectively.
The efect of some types of exercise on systolic pressure was studied. The results were as follows. 1. Increased rate of systolic pressure immediately after run of eight distances was greatest in 100 meter run. Such a high level was also observed in both 400 and 1, 500 meter runs. Further prolongation of the distance, however, induced a sharp reduction of increased rate to 5, 000 meters and in a run of still longer distance the above tendency was weakened. 2. If these results are applicable to the change of systolic pressure during a prolonged exercise, Edward's graphic representation seems to be true. Some of our experiments, however, indicated that Edward's curve was not the only case. Some features often expected were the following. a) Generally, the final rise was low if the initial rise was low. b) However, the final rise would be high in the cases with a faster finish even if the initial rise was low. c) In general, the final rise was high if the initial rise was high. d) However, the final rise would be lowering as development of exhaustion even if the initial rise was high, and only this form was considered to analogize with Edward's curve. 3. Blood pressure was determined during short interruption of exercise in 10, 000meter run. The lap time was estimated immediately before the determination of pressure. Since there was a strong statistical correlation between the increased rate of systolic pressure and the lap time (r=0.698, P<0.01), the fall in systolic pressure increased at early stage in a long continued exercise was supposed to be induced by decreased pace. Therefore, decreased severity of exercise may be a major factor inhibiting increase of pressure during prolonged exercise. It is undeniable that this type brought about by in-hibiting pressor effect is angmented by some nervous or humoral factors. 4. The longer the distance, the earlier the subnormal phase after exercise tends to start and the deeper the drop of systolic pressure will become. In all of the four prolonged runs over 5, 000 meters was observed average drop below normal of about 20 per cent and the lowest value of 28 per cent except two cases indicating marked fall. Futhermore, average fall below normal in mean arterial pressure induced after increased pressure by epinephrine was 30 per cent in rabbits. These data showed that in subnormal phase there may be a certain lower limit to sink and that the existense of this protective line of defence would prevent deterioration of the circulation. 5. The systolic pressure rised in the trained higher than in the untrained immediately after a short and sharp effort, but in the former the reduction of the rise with longer distance of run was more slight than the latter.
Thirteen healthy, untrained females whose ages varied between 37 and 44 years walked a distance of 26km rapidly on a summer day under extremely increment weather condition. Upon analyzing and reviewing anthropometrical measures, body composition, pulse rates, blood pressure and blood and urine test results, of eight subjects who successfully completed the exercise in 4 hours and 30 minutes, and of five other subjects who ceased exercise after 4 hours completing 20km walking, the followings were found. 1) No significant differences in after exercise effect of heart rates. In the meantime, mean systolic blood pressure of the 26 km-walking group decreased from 131.5 mmHg at early morning fast period to 116.3 mmHg right after exercise, while the value showed no changes in the 20 km-walking group. 2) The degree of increase in free fat acid (FFA) while was quite significant, was greater among 26 km walking group subjects than 20 km group. The changes in FFA recordings were considered to be indicative of active effort exerted for exercise. 3) The amount of triglycelide seemed to decrease more as the time length of exercise was greater, though no correlating trend with exercise intensity. 4) The amount of choresterole was observed not to be affected by exercise of less than 8 hours long. 5) From the urine test result, exercise intensity was suggested to be greater in 26km walking group than 20 km group, while harmful stress was estimated to be stronger in 20 km walking group than 26 km group. 6) The 20 km walking group was more influenced by blood thickening effect, increased LDH value more and showed greater decrease in blood sugar level. 7) Rate of body fat among healthy middle-aged women was expected to be between 25 abd 28 per cent.