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Rapid leptin decrease in immediate post-exercise recovery.

M Duclos1, J B Corcuff, A Ruffie

  • 1Laboratoire de Biologie Appliquée à l'Education Physique et aux Sports, Université Bordeaux II, France. martine.duclos@biosport.u-bordeaux 2.fr

Clinical Endocrinology
|August 6, 1999
PubMed
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Strenuous exercise significantly lowered leptin levels by approximately 30% in lean male runners. This decrease is linked to increased lipolysis, indicated by higher free fatty acids and glycerol, not cortisol.

Area of Science:

  • Exercise Physiology
  • Endocrinology
  • Human Metabolism

Background:

  • Leptin levels naturally decrease during fasting.
  • The impact of exercise-induced negative energy balance on leptin is less understood.

Purpose of the Study:

  • To investigate if exercise-induced negative energy balance affects human leptin concentrations.
  • To explore potential correlations between leptin, lipolysis markers, and cortisol.

Main Methods:

  • Eight male runners participated in two sessions: resting and exercise-and-rest (2h run + 2h rest).
  • Plasma samples were analyzed for leptin, free fatty acids (FFA), glycerol, and cortisol.
  • Salivary cortisol was also measured.

Main Results:

Related Experiment Videos

  • Exercise-and-rest significantly reduced leptin levels by 30.3% compared to rest (1.7 vs 2.5 µg/l).
  • Plasma FFA, glycerol, and cortisol levels increased post-exercise.
  • Negative correlations were observed between leptin and FFA, and leptin and glycerol.

Conclusions:

  • Strenuous exercise in lean individuals lowers leptin levels.
  • Increased lipolysis, evidenced by elevated FFA and glycerol, may mediate this decrease.
  • Cortisol does not appear to play a role in exercise-induced leptin reduction.