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Age-related decrease in heat pain tolerance is associated with a simultaneous decline in C-fiber functionality and

Bruno Rojas-Roel1, Julia Devanne1, Olivier Després1

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Summary
This summary is machine-generated.

Aging impairs heat pain tolerance due to reduced cutaneous vasodilation, hindering heat dissipation. Diminished C-fiber functionality may contribute to this decline in older adults.

Keywords:
AgingC-fiberCutaneous vasodilationLocal thermal hyperemiaPain tolerance

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Area of Science:

  • Physiology
  • Gerontology
  • Pain Research

Background:

  • Aging is associated with altered thermoregulation and pain perception.
  • Cutaneous vasodilation is crucial for heat dissipation and maintaining thermal homeostasis.
  • The role of C-fiber function in age-related changes in heat pain tolerance requires further investigation.

Purpose of the Study:

  • To investigate the relationship between cutaneous vasodilation and heat pain tolerance in aging.
  • To examine the association between C-fiber functionality and cutaneous vasodilation efficacy.
  • To identify factors contributing to diminished heat pain tolerance in older adults.

Main Methods:

  • Heat pain tolerance test with continuous pain and skin temperature monitoring.
  • Local thermal hyperemia protocol using laser Doppler flowmetry to assess cutaneous vasodilation.
  • Warm detection and heat pain threshold measurements to evaluate small fiber (C-fiber) functionality.

Main Results:

  • Older adults with lower heat pain tolerance (older LOW) exhibited reduced heat-induced vasodilation compared to younger subjects and older adults with higher tolerance (older MAX).
  • Older LOW subjects experienced higher skin temperatures and pain ratings during the tolerance test.
  • Diminished C-fiber functionality, indicated by higher warm detection thresholds, was observed in older LOW subjects.

Conclusions:

  • Reduced cutaneous vasodilation, potentially linked to impaired C-fiber functionality, negatively impacts heat pain tolerance in aging.
  • Inefficient heat dissipation due to impaired vasodilation contributes to decreased heat pain tolerance in some older adults.
  • Targeting C-fiber function and improving cutaneous vasodilation may be potential strategies to enhance heat pain tolerance in the elderly.