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Decrease of blood pressure in spontaneously hypertensive mice by heat treatment.

D Malo1, S C Pang, G Schlager

  • 1Clinical Research Institute of Montreal, Québec, Canada.

American Journal of Hypertension
|May 1, 1990
PubMed
Summary
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Chronic mild heat exposure normalized blood pressure in hypertensive mice. Daily 5-minute heat treatments at 40°C lowered blood pressure over 35 days, showing heat stress can be beneficial.

Area of Science:

  • Physiology
  • Cardiovascular Science
  • Thermoregulation

Background:

  • Hypertension is a condition characterized by elevated blood pressure.
  • Previous studies indicated hypertensive animals are more sensitive to heat stress.
  • The impact of chronic heat exposure on hypertension remained unexamined.

Purpose of the Study:

  • To investigate the effect of chronic heat exposure on blood pressure in spontaneously hypertensive mice.
  • To determine if prolonged mild heat stress can alter hypertensive states.

Main Methods:

  • Spontaneously hypertensive mice and normotensive controls were subjected to daily 5-minute heat exposure at 40°C.
  • Blood pressure was monitored over a 35-day period.
  • Control groups included sham-handled animals and those subjected to immobilization and prewarming procedures.

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Main Results:

  • Chronic heat exposure progressively lowered basal blood pressure in hypertensive mice within 20 days.
  • After 35 days, hypertensive mice exposed to heat had blood pressure levels similar to normotensive mice.
  • Heat exposure alone reduced blood pressure by approximately 20 mm Hg, beyond procedural effects.
  • Blood pressure returned to baseline levels in hypertensive mice after heat exposure ceased.

Conclusions:

  • Brief, chronic exposure to mild heat stress is beneficial for normalizing basal blood pressure in hypertensive mice.
  • While acute heat can be detrimental, controlled chronic heat application demonstrates a therapeutic potential.
  • These findings suggest a novel approach to managing hypertension through environmental modulation.