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Related Experiment Videos

How does light intensity influence evening dressing behavior in the cold?

Hiromi Tokura1, Hee-Eun Kim

  • 1Institute of Textiles and Clothing, The Hong Kong Polytechnic University, Kowloon, Hong Kong, China. tchiromi@polyu.edu.hk

Journal of Physiological Anthropology and Applied Human Science
|February 3, 2005
PubMed
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Bright light exposure affects core body temperature regulation. Bright light in the evening sharpens thermal sensitivity and dressing behavior, potentially mediated by melatonin and the thermoregulatory set-point.

Area of Science:

  • Chronobiology
  • Thermoregulation
  • Human Physiology

Background:

  • Core body temperature exhibits diurnal variations influenced by light exposure.
  • Melatonin, a key hormone in circadian rhythm regulation, may play a role in temperature control.
  • Light's impact on thermoregulation and associated behaviors is not fully understood.

Purpose of the Study:

  • To investigate the effects of diurnal and evening bright light exposure on core body temperature.
  • To examine how light exposure influences evening thermal sensibility and dressing behavior.
  • To explore the potential role of melatonin in mediating light-induced thermoregulatory changes.

Main Methods:

  • Exposure to controlled diurnal and evening bright light conditions.
  • Measurement of core body temperature (tympanic and rectal).

Related Experiment Videos

  • Assessment of evening thermal sensibility and dressing behavior.

    • Main Results:

    • Diurnal bright light lowered core temperature for hours and blunted evening thermal sensitivity.
    • Evening bright light inhibited the natural fall in core temperature and sharpened evening thermal sensitivity.
    • Melatonin levels and thermoregulatory set-point adjustments are implicated as underlying mechanisms.

    Conclusions:

    • Bright light exposure significantly alters core body temperature patterns and thermoregulatory responses.
    • Evening bright light enhances alertness to cold, potentially via melatonin suppression and set-point modulation.
    • These findings highlight the intricate relationship between light, melatonin, and human thermoregulation.