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Related Experiment Videos

Thermoregulation and heart rate variability

L A Fleisher1, S M Frank, D I Sessler

  • 1Department of Anaesthesiology, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA.

Clinical Science (London, England : 1979)
|February 1, 1996
PubMed
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Heart rate variability

Area of Science:

  • Physiology
  • Autonomic Nervous System
  • Thermoregulation

Background:

  • Heart rate variability (HRV) is influenced by autonomic and hormonal systems.
  • The very low-frequency (VLF) band of HRV power spectra may reflect thermoregulatory vasomotor control.
  • The direct link between thermoregulatory responses and HRV remains understudied.

Purpose of the Study:

  • To investigate the relationship between thermoregulatory responses (vasoconstriction, shivering) and heart rate variability.
  • To determine how core and skin temperature changes affect specific HRV frequency bands.

Main Methods:

  • Two protocols were used: core cooling via cold saline infusion and skin-surface cooling to induce shivering.
  • Power spectral analysis with fast Fourier transformation was employed.

Related Experiment Videos

  • HRV was analyzed across three distinct frequency bands.

    • Main Results:

    • Very low-frequency (VLF) power significantly increased with core cooling, vasoconstriction, and shivering.
    • Both VLF and low-frequency (LF) power increased with skin-surface cooling.
    • Heart rate decreased during vasoconstriction and increased with shivering.

    Conclusions:

    • VLF power is modulated by thermal stimuli leading to core hypothermia and thermoregulatory activity.
    • Skin-surface cooling alone, without core hypothermia, does not selectively alter VLF power.
    • HRV analysis provides insights into autonomic responses during thermoregulation.