Abstract
Rectal (Tre), mean skin temperature (\(\bar T\) sk) and sweating rate (\(\dot S\)) were measured in 4 residents of temperate climate under acute moderate heat exposure (designated EE in such an experimental situation), after 3 weeks in India (designated as EI) and in 8 Indian residents (designated as II) both at rest and during submaximal exercises at 2 different intensities. At rest, Tre is higher in EI (37.6°C) than in EE (36.8°C, P<0.01) and reaches 37.8°C in II. At the end of exercise, the increment in Tre seems to depend on work load only and to be independent of thermal environment; S follows a similar pattern in the 3 groups of subjects:\(\bar T\) sk is altered neither by exercise nor acclimatization. Under chronic heat exposure compared to acute conditions: (1) identical\(\dot S\) is achieved with higher Tre and similar\(\bar T\) sk so that the linear relationships\(\dot S\) vs Tre is shifted to the right. (2) the Tre —\(\bar T\) sk difference is greater at rest and during exercise: hence, skin blood flow, calculated from heat balance equation diminishes. In hot climate, a rise in Tre seems to be an adaptive response which allows the body to reduce skin blood flow.
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Raynaud, J., Martineaud, J.P., Bhatnagar, O.P. et al. Body temperatures during rest and exercise in residents and sojourners in hot climate. Int J Biometeorol 20, 309–317 (1976). https://doi.org/10.1007/BF01553588
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DOI: https://doi.org/10.1007/BF01553588