[Central temperature during chronic exposure to a warm climate].
Rectal temperature was determined at rest in 603 healthy melanoderm african men, in their natural environment. The ambient temperatures were noted between 20 and 38 degrees C on the morning and 23 to 46 degrees C on the afternoon, according to the season and place. On the morning results a significant positive correlation was found between rectal and ambient temperatures. On the afternoon results the situation was more complex: there was a positive correlation only with comfortable and warm ambient temperatures (23-35 degrees C), but not with higher temperatures (36-46 degrees C). Furthermore 28 young sportmen performed a submaximal 30 min exercise test on a cycloergometer at 2 ambient temperatures (comfortable and hot) and the difference in rectal temperature was appreciated between the beginning and the end of each activity. Results showed the same increase in the body temperature during the 2 tests. These results suggest that human thermoregulation remains effective in the subtropical area but can be adapted to the climatic conditions in permanent residents. Then the internal temperature is modified by the increasing ambient temperature, but there is a superior limit of this deep body temperature: when it is overpassed, a strong corrective mechanism is applied.
Cisse
F
F
Département de Physiologie, Faculté de Médecine de Dakar, Sénégal.
Martineaud
F
F
Martineaud
J P
JP
D000222:Adaptation, Physiological; D000354:Africa, Western; D044383:Black People; D001831:Body Temperature; D001833:Body Temperature Regulation; D015444:Exercise / Q000502:physiology; D006358:Hot Temperature; D006801:Humans; D008297:Male
La température centrale lors de l'exposition chronique au climat chaud.