Abstract
1. The present study is aimed at knowing whether ambient temperature ( T a) cycles exert any influence on circadian rhythm of rectal temperature ( T re) in humans. 2. Three different T a conditions were provided: (1) T a was kept constant at 25°C for 24 h (Constant). (2) T a decreased from 25°C to 22°C over 4 h from 1800 to 2200 h, was then kept constant at 22°C for additional 6 h and increased to 25°C over 4 h from 0400 to 0800 h (FLR). (3) T a was changed reversibly from 25°C through 28°C to 25°C with identical time schedule like FLR (RHF). 3. Minimum level and evening decreasing rate/morning increasing rate in T re were significantly the lowest and greatest in FLR.
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