With respect to the proportion of the theoretical and actual values of the cardiac output and the peripheral resistance 98 young healthy men were divided into three groups: 42 with the mixed type, 31 with the cardiac type and 25 with the vascular type of the circulation regulation. The environmental factors of a small size chamber gave rise to the changes that were the greatest in the subjects with the cardiac regulation and the least in the subjects with the mixed regulation. The subjects with the vascular type of regulation were those who showed varying tolerance to the environmental effects. It is suggested that the type of circulation regulation in the occupational selection as an indicator of the body tolerance to the environmental effects should be suggested.
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