Body temperatures during rest and exercise in residents and sojourners in hot climate |
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Authors: | J Raynaud J P Martineaud O P Bhatnagar H Vieillefond J Durand |
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Institution: | (1) Départment de Physiologie Humaine, Centre Chirurgical Marie- Lannelongue, 129, Rue de Tolbiac, 75 013 Paris, France;(2) Department of Physiology, Jawaharwal Institute of Post Graduate Medical Education and Research, 605006 Pondicherry, India |
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Abstract: | Rectal (Tre), mean skin temperature (
sk) and sweating rate (
) 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:
sk is altered neither by exercise nor acclimatization. Under chronic heat exposure compared to acute conditions: (1) identical
is achieved with higher Tre and similar
sk so that the linear relationships
vs Tre is shifted to the right. (2) the Tre —
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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Keywords: | |
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