Abstract
New born, infant, and adult mice, rats, guinea pigs, and rabbits were exposed to simulated altitude of 5, 000m to 8, 000m for 150 minutes or exposed repeatedly to simulated altitude of 5, 000m for 150 minutes a day for six days. Daily changes of the body weight during exposure period were observed and effects of the acute exposure to altitude on growth of the animals were investigated. Experiments were carried out in spring and summer seasons, which temperature and humidity in the low pressure chamber during experiment were maintained within the range of 22°to 26°C, and 70 to 72%, respectively. Ascending rates were 900 to 1, 000m per mi flute. Experimental results were as follows:
1. Single exposure to altitude of 5, 000m for 150 minutes did not show any decrease of the body weight change in all ages and kinds of the animals.
2. Repeated exposure to altitude of 5, 000m for 150 minutes a day for the period of 6 days showed small retarded growth in all animals in compared with control animals.
3. Single exposure to altitude of 8, 000m for 150 minutes showed the same retardation in body weight growth as in the case of repeated exposure to 5, 000m for 6 days.
