Control of Circadian Variation in Skin Blood Flow Response to Heat Stress

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  • AOKI Ken
    Division of Design Science, Graduate School of Science and Technology, Chiba University
  • KONDO Narihiko
    Laboratory for Applied Human Physiology, Faculty of Human Development, Kobe University
  • SHIBASAKI Manabu
    Laboratory for Applied Human Physiology, Faculty of Human Development, Kobe University
  • TAKANO Seiji
    Laboratory for Applied Human Physiology, Faculty of Human Development, Kobe University
  • KATSUURA Tetsuo
    Ergonomics Laboratory, Faculty of Engineering, Chiba University
  • HIRATA Kozo
    Laboratory of Clothing and Exercise Physiology, Faculty of Home Economics, Kobe Women’s University

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  • Control of Circadian Variation in Skin

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Abstract

Six male subjects had their lower legs immersed in water at 42°C for 60 min at 4 different times of the day to study whether the skin blood flow response to passive heat stress shows circadian variation in the relationship between skin blood flow and local sweating rate. When skin blood flow was plotted against local sweating rate, three distinct phases were observed. Phase A, an increase in skin blood flow without sweating was maximal at night. But the slope of the regression line did not change over the day in Phase C. These findings suggest that there is circadian variation in the skin blood flow response before onset of sweating during passive heat stress. This variation might be related, in part, to the circadian rhythm in vasoconstrictor activity.

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