Thermoregulation at rest and during exercise in prepubertal boys
| Autor: | J R Lacour, J Bittel, R. Flandrois, P Delamarche |
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| Rok vydání: | 1990 |
| Předmět: |
Male
medicine.medical_specialty Hot Temperature Convective heat transfer Physiology Physical exercise Sweating Heat transfer coefficient Animal science Oxygen Consumption Physiology (medical) medicine Humans Orthopedics and Sports Medicine Child Exercise Body surface area Dry-bulb temperature business.industry Puberty Public Health Environmental and Occupational Health VO2 max General Medicine Thermoregulation Surgery business Body Temperature Regulation |
| Zdroj: | European journal of applied physiology and occupational physiology. 60(6) |
| ISSN: | 0301-5548 |
| Popis: | Thermal balance was studied in 11 boys, aged 10-12 years, with various values for maximal oxygen uptake (VO2max), during two standardized sweating tests performed in a climatic chamber in randomized order. One of the tests consisted in a 90-min passive heat exposure [dry bulb temperature (Tdb) 45 degrees C] at rest. The second test was represented by a 60-min ergocycle exercise at 60% of individual VO2max (Tdb 20 degrees C). At rest, rectal temperature increased during heat exposure similar to observations made in adults, but the combined heat transfer coefficient reached higher values, reflecting greater radiative and convective heat gains in the children. Children also exhibited a greater increase in mean skin temperature, and a greater heat dissipation through sweating. Conversely, during the exercise sweating-test, although the increase in rectal temperature did not differ from that of adults for similar levels of exercise, evaporative heat loss was much lower in children, suggesting a greater radiative and convective heat loss due to the relatively greater body surface area. Thermophysiological reactions were not related to VO2max in children, in contrast to adults. |
| Databáze: | OpenAIRE |
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