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• W1992142769 abstract "GOMEZ-MERINO, D., M. CHENNAOUI, C. DROGOU, D. BONNEAU, and C. Y. GUEZENNEC. Decrease in serum leptin after prolonged physical activity in men. Med. Sci. Sports Exerc., Vol. 34, No. 10, pp. 1594–1599, 2002. Purpose This study was designed to determine whether serum leptin levels were affected by a 5-d military course after 3 wk of combat training. Methods 26 male soldiers (mean age = 21 ± 2 yr) were examined at the beginning of the training program and just at the end of the 5-d course. The combination of continuous heavy physical activity and sleep deprivation led to energy deficiency. Blood samples were analyzed for serum leptin, insulin, cortisol, adrenocorticotropin (ACTH), and testosterone; plasma was analyzed for free fatty acids (FFA), glycerol, glucose, and catecholamines. Results At the end of the 5-d course, there was a significant reduction in serum leptin (0.40 ± 0.04 ng·mL−1 versus 1.47 ± 0.14 ng·mL−1, P < 0.001), i.e., a mean decrease of 67.00 ± 3.75%. Plasma norepinephrine and dopamine rose significantly from 296 ± 17 ng·L−1 to 672 ± 48 ng·L−1 and 23 ± 3 ng·L−1 to 40 ± 5 ng·L−1 (P < 0.001 and P < 0.01, respectively), whereas epinephrine remained unchanged. Serum concentrations of the anabolic hormone, insulin, fell from 31.17 ± 3.03 μU·mL−1 to 17.79 ± 1.58 μU·mL−1 (P < 0.001), whereas plasma FFA and glycerol were increased (P < 0.001, P < 0.05, respectively). A statistically significant correlation appeared between the changes in leptin and insulin (r = 0.5306, P < 0.01). Serum testosterone decreased significantly (P < 0.001), whereas serum cortisol, ACTH, and plasma glucose were unchanged at the end of the course. The training program had no significant effect on mean body mass index. Conclusion A 4-wk strenuous military training program, which induced an energy deficiency, reduced serum leptin to a third of normal levels. The decrease in serum leptin was attributed to the exercise-induced elevation in catecholamines and hypoinsulinemia." @default.
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• W1992142769 date "2002-10-01" @default.
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• W1992142769 title "Decrease in serum leptin after prolonged physical activity in men" @default.
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• W1992142769 doi "https://doi.org/10.1097/00005768-200210000-00010" @default.
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