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Related Experiment Videos

Experimental pain thresholds and plasma beta-endorphin levels during exercise.

C Droste1, M W Greenlee, M Schreck

  • 1Benedikt Kreutz Cardiovascular Rehabilitation Center, Bad Krozingen, Germany.

Medicine and Science in Sports and Exercise
|March 1, 1991
PubMed
Summary

Intense exercise temporarily boosts pain tolerance in healthy men, even after exercise ends. This pain relief is not directly linked to endorphin levels, as shown by naloxone not affecting the outcome.

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Area of Science:

  • Exercise Physiology
  • Pain Perception
  • Neuroendocrinology

Background:

  • Physical exercise is known to influence pain perception.
  • The role of endogenous opioids and other hormones in exercise-induced analgesia requires further clarification.

Purpose of the Study:

  • To investigate the effects of strenuous physical exercise on pain thresholds and plasma hormone levels.
  • To examine the potential involvement of beta-endorphin, cortisol, and catecholamines in exercise-induced analgesia.
  • To determine if naloxone, an opioid antagonist, modulates exercise-induced changes in pain perception and hormone levels.

Main Methods:

  • Ten healthy male subjects underwent electrical intracutaneous finger and dental pulp stimulation to assess pain thresholds.
  • Plasma levels of beta-endorphin, cortisol, and catecholamines were measured.

Related Experiment Videos

  • A double-blind, placebo-controlled study was conducted with naloxone administration prior to exercise.
  • Exercise intensity was progressively increased.

    • Main Results:

    • Pain thresholds significantly increased during exercise, peaking at maximal exertion.
    • Elevated pain thresholds persisted for 10-15 minutes post-exercise, returning to baseline after 60 minutes.
    • Subjective pain perception of suprathreshold stimuli decreased post-exercise.
    • Plasma beta-endorphin, cortisol, and catecholamines significantly increased during exercise.
    • Naloxone did not alter pain thresholds but resulted in higher beta-endorphin and cortisol levels during exercise.

    Conclusions:

    • Short-term, exhaustive physical exercise induces a transient increase in pain thresholds.
    • The exercise-induced elevation in pain threshold is not directly correlated with plasma beta-endorphin levels.
    • The opioid system does not appear to be the primary mediator of this exercise-induced analgesia.