Thermoregulation in the cold after physical training at different ambient air temperatures
| Autor: | Anne-Marie Hanniquet, Jean-Claude Launay, Yves Besnard, Angélique Guinet, Jacques Bittel, Gustave Savourey |
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| Rok vydání: | 2002 |
| Předmět: |
Male
Physiology Acclimatization Physical Exertion Physical exercise Interval training Body Temperature Animal science Physiology (medical) Humans Medicine Pharmacology Analysis of Variance Dry-bulb temperature Electromyography business.industry Temperature Training (meteorology) General Medicine Thermoregulation Ambient air Cold Temperature Analysis of variance business Body Temperature Regulation |
| Zdroj: | Canadian Journal of Physiology and Pharmacology. 80:857-864 |
| ISSN: | 1205-7541 0008-4212 |
| DOI: | 10.1139/y02-109 |
| Popis: | Since human thermoregulation at rest is altered by cold exposure, it was hypothesized that physical training under cold conditions would alter thermoregulation. Three groups (n = 8) of male subjects (mean age 24.3 ± 0.9 years) were evaluated: group T (interval training at 21°C), group CT (interval training at 1°C), and group C (no training, equivalent exposure to 1°C). Each group was submitted, before and after 4 weeks of interval training (5 d/week), to a cold air test at rest (SCAT) (dry bulb temperature (Tdb) = 1°C) for a 2-h period for evaluation of the thermoregulatory responses. During SCAT, after the training/acclimation period, group T exhibited a higher rectal temperature (Tre) (P < 0.05) without significant change in mean skin temperature (Tbarsk) whereas metabolic heat production (Mdot) was higher at the beginning of the SCAT (P < 0.05). For group CT, no thermoregulatory change was observed. Group C showed a lower Tre (P < 0.05) without significant change in either Tbarsk or in Mdot, suggesting the development of a hypothermic general cold adaptation. This study showed, first, that the cold thermoregulatory responses induced by an interval training differed following the climatic conditions of the training and, second, that this training performed in the cold prevented the development of a general cold adaptation.Key words: physical training, cold tolerance, general cold adaptation, human, thermoregulation. |
| Databáze: | OpenAIRE |
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