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Related Experiment Videos

Passive temperature lability in the elderly

G S Anderson1, G S Meneilly, I B Mekjavic

  • 1School of Kinesiology, Simon Fraser University, Burnaby, British Columbia, Canada.

European Journal of Applied Physiology and Occupational Physiology
|January 1, 1996
PubMed
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Elderly individuals exhibit greater body temperature fluctuations due to delayed sweating and earlier shivering responses. This suggests an increased susceptibility to temperature-related health issues in older adults.

Area of Science:

  • Gerontology
  • Human Physiology
  • Thermoregulation

Background:

  • Aging is associated with altered physiological responses.
  • Thermoregulatory mechanisms are crucial for maintaining core body temperature.
  • Understanding age-related changes in thermoregulation is vital for preventing heat- and cold-related illnesses.

Purpose of the Study:

  • To compare the thermoregulatory responses between healthy elderly individuals and young adults.
  • To investigate the thresholds for sweating cessation and shivering onset in different age groups.
  • To assess the impact of age on the body's ability to manage thermal stress.

Main Methods:

  • Nine healthy elderly participants and nine young adult men underwent controlled exercise and subsequent immersion in cool water.

Related Experiment Videos

  • Tympanic temperature, oxygen uptake, sweating rate, and skin blood perfusion were measured.
  • Thermoregulatory thresholds, including the cessation of sweating (Tsw) and onset of shivering (Tsh), were determined.

    • Main Results:

    • Elderly individuals had significantly higher Tsw thresholds (0.48°C vs. 0.21°C) and lower Tsh thresholds (-0.64°C vs. -0.22°C) compared to young adults.
    • The temperature range between sweating cessation and shivering onset (null-zone) was significantly wider in the elderly (1.12°C vs. 0.43°C).
    • Reduced oxygen uptake and a blunted vasoconstrictor response were observed in the elderly during cooling.

    Conclusions:

    • Healthy elderly individuals exhibit greater passive core temperature lability.
    • Delayed onset of sweating and earlier onset of shivering in the elderly indicate impaired thermoregulation.
    • These findings suggest an increased risk of hypothermia and hyperthermia in older adults facing thermal challenges.