Strenuous muscular exertion in the polar climate.

Abstract Work capacity and cold tolerance have been studied in 12 subjects who attempted to cross the Polar ice-cap on skis. The principal changes observed were an increase in body-weight and skinfold thickness, a drop in the resting and working heart rates, a slight decrease in the maximum oxygen uptake, a marked increase in the ‘ basal ’ metabolic rate, and an increase in tissue conductance. most of these changes seem related to increased physical activity, and perhaps to associated increases in protein intake.

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