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Leptin concentrations experience a delayed reduction after resistance exercise in men.

Bradley C Nindl1, William J Kraemer, Paul J Arciero

  • 1Intercollege Graduate Program in Physiology, Department of Kinesiology, The Pennsylvania State University, University Park, PA, USA. Bradley.Nindl@NA.AMEDD.Army.Mil

Medicine and Science in Sports and Exercise
|April 5, 2002
PubMed
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Resistance exercise causes a delayed drop in leptin, a key metabolic hormone. This reduction, observed 9 hours post-exercise, is linked to energy expenditure and elevated resting energy expenditure the next morning.

Area of Science:

  • Exercise Physiology
  • Endocrinology
  • Metabolic Research

Background:

  • Leptin is a crucial metabolic hormone regulating energy balance.
  • Previous studies indicated leptin levels are unaffected by acute, moderate exercise.
  • Short post-exercise sampling times (<4 hours) may have obscured delayed leptin changes.

Purpose of the Study:

  • To investigate the hypothesis that acute resistance exercise induces a delayed reduction in circulating leptin concentrations.
  • To examine leptin levels over an extended period (up to 13 hours) post-exercise.
  • To assess the relationship between leptin changes and resting energy expenditure (REE) following exercise.

Main Methods:

  • Ten healthy men underwent an acute heavy-resistance exercise protocol (AHREP) lasting 2 hours.

Related Experiment Videos

  • Blood samples were collected hourly post-exercise until the following morning.
  • Leptin concentrations were measured using an immunoradiometric assay; REE was determined by indirect calorimetry.

    • Main Results:

    • No significant changes in leptin were observed until 9 hours post-AHREP.
    • Leptin concentrations were significantly lower at 9, 10, 12, and 13 hours post-exercise compared to a control period.
    • A 12% increase in morning-after REE was noted following the AHREP.

    Conclusions:

    • Acute resistance exercise leads to a delayed reduction in systemic leptin concentrations, approximately 9 hours post-exercise.
    • This leptin decline is likely a consequence of metabolic disruption and significant energy expenditure from the AHREP.
    • The observed changes in leptin are not attributed to fat mass loss but rather to the exercise-induced metabolic response and excess post-exercise oxygen consumption (EPOC).