The treadmill Exercise was performed for 26 asthmatic children (EIA+) with mask, under the circumstance of Temp 26°C, Humidity 95%. We have also examined these children with a special jacket (60 mmHg pressure) doing the treadmill. 1) The comparison of FEV 1.0 and PEFR with room air and moist air showed similar pattern post 5 min exercise. However, the fall of FEV 1.0 differed drastically, resulting in 44% fall for room air, and 27% for moist air. (P<0.01) 2) The children who wore the jackets differed drastically from the room air children post exercise. (P<0.05) 3) From these results, we predict that such exercise as swimming suits the condition with adequate moisture, pressure, and its method of breathing which prevents Exercised Induced Asthma attack.
An electromyographic silent period appears prior to initiation of a reaction movement. In order to estimate the mechanism of the silence, the statistical properties of the EMG before the onset of the phasic discharge were investigated. The EMG activity was processed as a stochastic process, and the statistical properties were analyzed. It was found that the mean of the rectified EMG decreased from 100 ms before the onset of the phasic discharge. As to the relationship between the silence and the depression of the EMG activity, it was estimated that the depressing influence was so remarkable that the silent period was observed.
Male rats of 80 weeks of age were divided into 2 groups, sedentary group (Group I, n-7) and exercise-trained group (Group II, n=8) . Rats in Group II were conditioned by a 4-weeks treadmill running program. These two groups and another group of male sedentary rats of 20 weeks of age (Group III, n-9) were all subjected to a Wiggers type hemorrhagic shock (mean arterial pressure of 30 torr. for 60 min.) . Pulse rate and pulse pressure during the shock experiment, acid-base balance indices and blood gas before and after the shock period, and survival rate within 7 days after the shock experiment were compared between the three groups. Animals in Group I showed remarkably decreased pulse pressure during the shock period. Metabolic acidosis after the shock period in Group I was remarkable, resulting in a significantly higher mortality compared with Group III. In Group II, pulse pressure during the shock period was higher than in Group I. Metabolic acidosis after the shock period in Group II was less marked than in Group I, and mortality tended to be lowered in Group II. These results indicated that physical training induced resistance to hemorrhagic shock in aged rats. One of the mediating mechanisms in this cross-adaptation between exercise and hemorrhagic shock may be changes in oxygen transport system.