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Related Experiment Videos

Human core temperature minimum can be modified by ambient thermal transients

G Dewasmes1, A Nicolas, D Rodriguez

  • 1Laboratoire de physiologie et de psychologie environnementales, UMR 32 CNRS, Strasbourg, France.

Neuroscience Letters
|May 23, 1994
PubMed
Summary
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Researchers manipulated ambient temperature during sleep to advance the human internal temperature (Ti) minimum. This temperature modulation shifted the Ti minimum without affecting sleep stages or duration, offering a novel way to influence biological rhythms.

Area of Science:

  • Chronobiology
  • Human Physiology
  • Sleep Science

Background:

  • Human internal temperature (Ti) exhibits a significant circadian rhythm, typically reaching its minimum during late sleep.
  • Modulating this core body temperature rhythm is challenging and often considered resistant to typical sleep-wake cycle manipulations.

Purpose of the Study:

  • To investigate if controlled ambient temperature changes can advance the timing of the human internal temperature (Ti) minimum during nocturnal sleep.
  • To determine the impact of such temperature manipulations on sleep architecture.

Main Methods:

  • Utilized slow linear thermal transients of controlled amplitude around thermoneutrality during nocturnal sleep.
  • Monitored esophageal (Tes) and rectal (Tre) temperatures to identify the minimum internal temperature.

Related Experiment Videos

  • Compared temperature minimum timing and sleep parameters (latency, efficiency, SWS, REM) between experimental and reference nights.

    • Main Results:

    • Slow ambient temperature transients significantly advanced the minimum of esophageal (Tes) and rectal (Tre) internal temperatures during sleep.
    • The advancement of the Ti minimum occurred without significant alterations in sleep latency, sleep efficiency, slow-wave sleep (SWS), or rapid eye movement (REM) sleep percentages.

    Conclusions:

    • Controlled, subtle ambient temperature fluctuations can effectively modify the timing of the human internal temperature (Ti) rhythm during sleep.
    • This provides a potential non-pharmacological method to influence major biological rhythms, including core body temperature, which are typically resistant to manipulation.