The aged above 40 to 76 years old ran 25 kirometers. We measured the systolic and diastolic blood pressure all of them before start and immediately after goal. The urine had been tested too. The results were as follows. 1) The systolic and diastolic blood pressures measured at the point of immediately after goal were lower than that of before running in all aged groups markedly. Beside decreasing tendency of blood pressure, especially of systolic phase, due to running was higher in older people than younger. 2) The excretion of albumin in urine was increased by the running in all age groups, but the degree of it was larger in younger group than older people. 3) The number of people whose urine pH moved to acidity caused by running was much in the youngest group, and no one had been found in the oldest group.
Blood flow in relationship to muscular contraction were studied in hindlimb of rabbits anesthetized with urethane and electricity. Exercise hyperemia (EH), postexercise hyperemia (PEH) and hematocrit (Hct) were measured with time intervals. Under a blood pressure of 100/70 mmHg by urethan anesthesia, EH with stimulation of 5 to 10 Hz was exponentially increased to a 2-3 times more than the control level. But, EH produced by stimulation of 20 to 50 Hz decreased from the start to the first 20 sec of exercise, then increased gradually to a peak within 60 sec after exercise. Recovery time in PEH was prolonged as the intensity of the stimulation increased ; about 4 min by 5 Hz, 6-7 min by 10 Hz, and 8-13 min by 20-50 Hz. On the other hand, under a blood pressure of 150/100 mmHg by electroanesthesia, a rapid increase in EH was observed, and a shorter recovery time in PEH was obtained with an equal stimulation ; about 2 min by 5 Hz, and 4 min by 20 Hz. An increase in Hct occurred at the first 15 to 20 sec of exercise, and in strenuous muscle contraction it was approximately 3% higher than the resting level. In PEH, Hct decreased gradually as the degree of hyperemia fell. Muscle blood flow and Hct increase in response to the muscular activity evoked. The data suggest that these changes depend on the complex mechanism of arteriolar dilatation, capillary bed enlargement, an increase of capillary permeability and water shift.
In order to develop skill of students in the physical education, the authors investigated the relation between the intensity of stimulus and the amplitude of evoked potential and how the amplitude is affected by the verbal suggestion of stimulus intensity when the subject is in the hypnotic state. 1. There is an approximately parallel relation among the intensity level (db) of auditory stimulus, the light area of optical stimulus, and the amplitude of evoked potential. 2. When the subject is in the hypnotic state, the amplitude of vertex potential is larger if he is told that the stimulus is loud, and the amplitude is smaller if he is told that the stimulus is small. 3. When the subject is in the hypnotic state, the verbal suggestion that he feels no pain at all produces a big positive change in the amplitude of vertex potential, while the suggestion that he feels very much pain produces a negative change and in some cases, an after-discharge can be observed. But no change was seen in the evoked potential of the central area. 4. When the subject is hypnotized, the amplitude of evoked potential in the occipital area increases and decreases according to the verbal suggestion that the light looks larger and smaller respectively. Hypnotic suggestion may be applied to the guidane in physical education.
Our interest is to know the learning process of skillness, because more needed to apply the optimum muscle power rather than maximum one in our daily life. The experiment is so simply designed that subjects are only required to land just correctly at the marked line by a bound jump. The width by jumping to reach is only distance of 1/3 body height of each individual. The jumpings are done in 3 ways : (1) voluntary take off, (2) take off with buzzer signal, (3) jumping with blindfold. As subjects served boys and girls ranging from 6 to 21 years of age. Distances between maked line and landing point, and times taken by motions are measured, through the electric system with a strain guage which is attached to taking off and landing boad. The results are shortly concluded as follow ; (1) In more aged subjects make smaller gaps, which are given as the names of algebraical sum of absolute value of distance from maked line. The subjects of over 15 years of age landed always within small gaps. (2) Subjects of over 15 years of age take longer time for knee joint extention. In younger subjects (i, e, younger than 15 years of age), time of knee extention is rather shorter, however, they take longer time for just sinking which is accompanied with knee extention. (3) The jumping action is done in the series of motion of just sinking and extending the knee joint. Correlationship between knee extention time and just sinking time is significant (r=0.569**), in the subjects of 18-21 years, however no correlationship is obtained in 6-11 years of age. (4) Jumping with blindfold takes longer distance. The visual feedback seems to take major part in controling. However both ratio of knee extention per time of just sinking in the two ways of jumping i, e, voluntary jumping with open eye and with blindfold is almost same. (5) In the case of taking off with buzzer signal, subjects incline to land further than voluntary take off. This gives us the suggestion that buzzer sound increases in the excitation on reticular activationg system. Poor coordination in young individuals is likely due not only to lack in cortical realization of motion pattern but to rough synapting of spinal and cortical circuit.