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Dark adaptation curve during body temperature decrease

S Watanuki1

  • 1Faculty of Human Life Science, Osaka City University.

The Annals of Physiological Anthropology = Seiri Jinruigaku Kenkyukai Kaishi
|January 1, 1994
PubMed
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Body temperature decrease from cold exposure impacts visual acuity. Lower body temperature, particularly during the follicular phase of the menstrual cycle, affects dark adaptation curves and visual performance.

Area of Science:

  • Physiology
  • Ophthalmology
  • Human Biology

Background:

  • Body temperature fluctuations occur with cold exposure and the menstrual cycle.
  • Visual acuity and dark adaptation can be influenced by physiological changes.

Purpose of the Study:

  • To investigate how body temperature decrease, influenced by cold exposure and menstrual cycle phase, affects visual acuity.
  • To examine the relationship between dark adaptation curve (DAC), heart rate (HR), and tympanic membrane temperature (Tty) under varying thermal conditions and menstrual cycle phases.

Main Methods:

  • Measurements of DAC, HR, and Tty were taken at thermoneutral (29°C) and cold (15°C) conditions.
  • Data were collected during both the follicular and luteal phases of the menstrual cycle.
  • Comparisons were made between different thermal conditions and menstrual cycle phases.

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Main Results:

  • Tympanic membrane temperature was lower in the follicular phase compared to the luteal phase under both thermoneutral and cold conditions.
  • Cold exposure significantly decreased heart rate in both phases, with no significant phase difference.
  • Dark adaptation curves were lower during cold exposure than thermoneutral conditions in both phases.
  • A notable finding was that DAC during cooling in the follicular phase was lower than during cooling in the luteal phase.
  • In some subjects, an increase in Tty with cold exposure correlated with higher DAC.
  • Even at thermoneutral conditions, head cooling in the luteal phase lowered DAC.

Conclusions:

  • Decreased body temperature may enhance brightness sensitivity in scotopic vision.
  • The light threshold during dark adaptation appears related to changes in tympanic membrane temperature.
  • Both cold exposure and menstrual cycle phase significantly influence visual function and physiological responses.