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Localized β-adrenergic receptor blockade does not affect sweating during exercise.

Michael J Buono1, Brian Tabor, Ailish White

  • 1San Diego State University, San Diego, CA 92182, USA. mbuono@mail.sdsu.edu

American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
|February 18, 2011
PubMed
Summary
This summary is machine-generated.

Locally applied propranolol does not directly impact sweat gland function during exercise. This study isolated the drug

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Area of Science:

  • Exercise Physiology
  • Dermatology
  • Pharmacology

Background:

  • Systemic propranolol's effect on sweat production during exercise is inconsistent.
  • Previous studies lack clarity due to confounding systemic drug effects.

Purpose of the Study:

  • To determine the direct effect of a nonselective beta-adrenergic antagonist on eccrine sweat gland function.
  • To investigate localized propranolol's impact on sweating during exercise, eliminating systemic effects.

Main Methods:

  • Propranolol was iontophoresed to one forearm, with saline applied to the contralateral arm as a control.
  • Subjects exercised at 75% maximal heart rate for 20 minutes.
  • Sweat rate and active sweat gland density were measured in both forearms post-exercise.

Main Results:

  • No significant difference in sweat rate between propranolol-treated (0.60 mg·cm⁻²·min⁻¹) and control (0.62 mg·cm⁻²·min⁻¹) forearms (P = 0.86).
  • Active sweat gland density was similar: 134 glands/cm² (propranolol) vs. 130 glands/cm² (control) (P = 0.33).
  • End-exercise skin temperature showed no significant difference between arms.

Conclusions:

  • Local administration of propranolol does not directly alter sweat gland function during the initial phase of high-intensity exercise.
  • Beta-adrenergic blockade has a negligible direct effect on eccrine sweating in young, healthy individuals under these conditions.