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Serum leptin responses after acute resistance exercise protocols.

A Zafeiridis1, I Smilios, R V Considine

  • 1Department of Physical Education and Sports Science, Aristotelio University of Thessaloniki, Greece.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|October 23, 2002
PubMed
Summary

Resistance exercise protocols for maximum strength, hypertrophy, and endurance did not alter serum leptin levels immediately or 30 minutes post-exercise. These findings suggest exercise type does not significantly impact acute leptin response.

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Area of Science:

  • Exercise Physiology
  • Endocrinology
  • Metabolism

Background:

  • Leptin, a key regulator of energy balance, is influenced by various physiological stimuli.
  • The acute effects of different resistance training protocols on serum leptin levels remain incompletely understood.
  • Understanding these responses is crucial for optimizing exercise strategies and metabolic health.

Purpose of the Study:

  • To investigate the acute impact of maximum strength (MS), muscular hypertrophy (MH), and strength endurance (SE) resistance exercise protocols on serum leptin concentrations.
  • To compare these effects with a control (fasting) condition.
  • To examine hormonal responses including cortisol, glucose, and growth hormone.

Main Methods:

  • Ten healthy young men underwent four experimental sessions: MS (4x5 reps at 88% 1RM), MH (4x10 reps at 75% 1RM), SE (4x15 reps at 60% 1RM), and a control (C) session.

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  • Blood samples were collected pre-exercise, immediately post-exercise, and 30 minutes post-exercise.
  • Serum leptin, cortisol, glucose, and growth hormone were analyzed.

    • Main Results:

    • Serum leptin showed similar reductions from baseline at 30 minutes post-exercise across MS, MH, and SE protocols, comparable to the control session.
    • No significant differences in serum leptin were observed among the exercise protocols or the control session immediately or 30 minutes post-exercise.
    • Cortisol levels were elevated after MH and SE protocols, while glucose and growth hormone increased after all exercise protocols compared to control.

    Conclusions:

    • Standard resistance exercise protocols targeting maximum strength, muscular hypertrophy, and strength endurance do not acutely alter serum leptin levels.
    • The observed reductions in leptin appear to be similar to fasting-induced changes and are not significantly different between exercise types.
    • These findings indicate that acute leptin response is not a distinguishing factor among these common resistance training modalities.