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Related Experiment Videos

Plasma beta-endorphin immunoreactivity: response to resistance exercise

E F Pierce1, N W Eastman, H T Tripathi

  • 1Department of Health and Sport Science, Robins Center, University of Richmond, Virginia 23173.

Journal of Sports Sciences
|December 1, 1993
PubMed
Summary

Resistance exercise did not significantly alter plasma beta-endorphin (beta-EP) levels in trained athletes. Findings highlight considerable individual variability in beta-EP response to intense workouts.

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Area of Science:

  • Exercise Physiology
  • Neuroendocrinology
  • Sports Science

Background:

  • Previous studies on plasma beta-endorphins (beta-EP) response to resistance exercise show inconsistent results.
  • Understanding the neuroendocrine adaptations to exercise is crucial for sports performance and health.

Purpose of the Study:

  • To investigate the impact of resistance exercise on plasma beta-endorphin concentrations in trained athletes.
  • To clarify the equivocal findings regarding beta-EP response to resistance training.

Main Methods:

  • Six resistance-trained athletes performed three sets of eight repetitions at 80% maximal effort.
  • Blood samples were collected pre- and post-exercise.
  • Plasma beta-endorphin concentration was measured using radioimmunoassay.

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Main Results:

  • Mean plasma beta-endorphin levels post-exercise (18.04 +/- 3.4 pg beta-EP ml-1) were not significantly different from pre-exercise levels (19.59 +/- 2.4 pg beta-EP ml-1).
  • Significant inter-individual variability in beta-EP response was observed among participants.

Conclusions:

  • Resistance exercise at 80% maximal effort does not significantly change plasma beta-endorphin levels in trained athletes.
  • The considerable inter-individual variability in beta-EP response to exercise warrants further investigation.