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Decrease in serum leptin after prolonged physical activity in men.

Danielle Gomez-Merino1, Mounir Chennaoui, Catherine Drogou

  • 1Department of Physiology, IMASSA-CERMA, Brétigny-sur-Orge, France. dgomez@imassa.fr

Medicine and Science in Sports and Exercise
|October 9, 2002
PubMed
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Strenuous military training significantly reduced serum leptin levels by 67% due to energy deficiency. This decrease in leptin was linked to elevated catecholamines and lower insulin levels in soldiers.

Area of Science:

  • Endocrinology
  • Sports Medicine
  • Military Physiology

Background:

  • Leptin is a key hormone regulating energy balance and body weight.
  • Military training programs often involve intense physical activity and caloric restriction, potentially impacting hormonal profiles.

Purpose of the Study:

  • To investigate the effect of a 5-day military course, following 3 weeks of combat training, on serum leptin levels in male soldiers.
  • To assess the relationship between leptin and other key hormones and metabolites under conditions of energy deficiency.

Main Methods:

  • 26 male soldiers underwent assessment before and after a 5-day military course characterized by heavy physical activity and sleep deprivation.
  • Serum leptin, insulin, cortisol, adrenocorticotropin (ACTH), and testosterone were measured.

Related Experiment Videos

  • Plasma levels of free fatty acids (FFA), glycerol, glucose, and catecholamines were analyzed.

    • Main Results:

    • Serum leptin decreased by 67% (p < 0.001) after the 5-day course.
    • Significant increases in plasma norepinephrine and dopamine, along with decreased serum insulin and testosterone, were observed.
    • Plasma FFA and glycerol levels increased, while serum cortisol and glucose remained unchanged.

    Conclusions:

    • A 4-week strenuous military training program induced significant energy deficiency, reducing serum leptin to one-third of normal levels.
    • The observed reduction in leptin is attributed to exercise-induced elevations in catecholamines and hypoinsulinemia.
    • These findings highlight the impact of extreme physical exertion and energy deficit on hormonal regulation.