Effect of Ambient Temperatures Between 21°C and 35°C on the Responses to Progressive Submaximal Exercise in Partially Acclimated Man

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Abstract
The effects of variation in dry-bulb temperature between 2l°C and 35°C on the physiological responses to a 12-minute progressive submaximal exercise test have been examined in four healthy men partially acclimated to heat. On average, cardiac frequency and minute ventilation at standard oxygen uptake increased by 1·4% (r+0·85; pr+ 0·46; p<0·00l) respectively for each degree rise in dry-bulb temperature. The increase in exercise cardiac frequency with each degree rise in mean akin temperature averaged 5·1 %. A regression relationship is presented which permits adjustment of the cardiac frequency at standard oxygen uptake to either a standard dry-bulb temperature or mean skin temperature. Its use and limitations are illustrated using data collected during studies which formed part of the U.K. contribution to the International Biological Programme.

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