抄録
Circadian variations of the dynamic properties in sweating activity were investigated by power spectral analysis. Subjects were exposed to a fixed level of thermal radiation at 3 different times of day. Variability in the rate of sweating was measured using a ventilated-capsule method, and the results were analyzed by the fast Fourier transform. In the spectra obtained, the frequency component around 0.04 Hz, at which a peak was observed on the logarithmic plot, showed a higher power value in the early and late afternoon than in the morning. This component was correlated to a similar frequency component of skin blood flow, and both components showed similar circadian variation. These findings suggest the presence of a circadian oscillatory system that influences both the sweating rate and skin blood flow during thermoregulation.
