The subjects at present investigation were selected among people from 64 years of age to 72 (average age: 67.3 years) . For each of them the following three items were investigated and the obtained results were analyzed.
1) Step Test: The used step was 20 cm high and the subjects were made to step up ana down 5-20 times.
The changes of pulse rate and blood pressure before during and after above exercise, were observed under the following three conditions.
a) Voluntary exercise: No restriction of speed and of stepping number.
b) Stepping up and down per one min in accordance with the rhythm of a metronome.
c) The subjects were made to step up and down as quick as possible.
As the result of the above observation, there was no significant difference in time necessary to step up and down 20 times and in blood pressure after exercise.
However, there was found a significant difference in pulse rate during and after exercise, i. e. under the condition of c) the subjects revealed the highest pulse rate and then that under b) was higher than under a) .
Under all above three conditions, the more stepping numbers increased, the higher pulse rate was.
When pulse rate of 1.5 times as much as that at rest is defined as upper limit of safety
10), the pulse rate under the condition of a) reached that limit at 20 times' steppings, that under b) at 15 times, and that under c) 10 times'.
2) Muscular strength of arm flexion: There was found no sigificant difference in it between the right and left arms. The right muscular strength of it was 3.02±0.2 kg in average, which was under the muscular strength of the primary school girls of the 1st grade.
3) Muscular strength of leg extension: There was also found no significant difference in it between the right and left legs. The muscular strength of the right leg was 78.4±0.75 kg in average, which was under the value of the primary school girls of the 3rd grade.
It was observed that both the above muscular strengths were remarkably decreased by aging. Therefore, it could be assumed that aged people got harder to step up and down rather due to weakened muscular strength of their legs.
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