Central temperature and its circadian rhythm in men acclimated to the intertropical zone

: The central temperature has been measured at rest over 623 black men who are between 18 and 78 years old, and perfectly fit to warm weather in the intertropical areas. The measures have been taken according to two protocols: dealing with the ambiant temperature and the humidity (ambiant temperature varying from 20 degrees C to 42 degrees C, the humidity from 70% to 80%). dealing with the daily cycle: The central temperature was recorded every 3 hours by 24 hours at two different periods in the year, on June (the ambiant temperature varying from 28 degrees C to 42 degrees C and the humidity from 33 to 42%), and on December (the ambiant temperature varying from 21 degrees C to 25 degrees C and the humidity from 70 to 90%). On the one hand, the results showed an influence of the external temperatures on the circadian curves of the central temperature (maximal central temperature taken in the afternoon was 37.2 degrees C in winter and 37.6 degrees C in summer). On the other hand, there's a linear relation between central temperature and ambiant temperature, at least on certain limit and apart from the weather. In spite of two modifications, the thermoregulator system of some designed individual remain efficiency but would work rather than according to the mechanism of the "following" systems.(ABSTRACT TRUNCATED AT 250 WORDS)