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American Physiological Society (APS) Releases Highlights from It's Peer Reviewed Journals
LH Secretion and Testosterone Concentrations are Blunted After Resistance Exercise in Men
Summary: Researchers have hypothesized that exercise-induced changes in circulating testosterone would be centrally mediated via hypothalamic-pituitary release of luteinizing hormone (LH).
Methodology: In a study of 10 healthy young men, Bradley C. Nindl and colleagues examined overnight LH, total and free testosterone (TT and FT), and cortisol (C) concentrations during two experimental sessions: (1) a control and (2) an acute heavy-resistance exercise bout (50 total sets consisting of squats, bench press, leg press, and latissimus dorsi pull-down). The exercise was performed from 1500 to 1700 hours, and blood samples were taken beginning at 1700 and continuing until 0600 the next morning. Blood was sampled every 10 minutes for LH and every hour for TT, FT, and C.
Conclusions: Overnight post-exercise concentrations were compared with control concentrations; no statistically significant differences were observed for LH half-life, LH pulse frequency, interpulse interval, pulse amplitude, or pulse mass. Significant differences, however, were observed for LH production rate. For the ANOVA marginal main effect means due to condition C was significantly elevated, while TT and FT were significantly decreased for the exercise condition. The researchers concluded that the decline in overnight testosterone concentrations after acute heavy-resistance exercise is accompanied by a blunted LH production rate and elevated C concentrations.
Source: Journal of Applied Physiology, August 2001
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The American Physiological Society (APS) was founded in 1887 to foster basic and applied science, much of it relating to human health.The Bethesda, MD-based Society has more than 10,000 members and publishes 3,800 articles in its 14 peer-reviewed journals every year.
Editor's Note: For the full text of the summaries cited above, or to set up an interview with a lead investigator, please contact Donna Krupa at 703.527.7357 (direct dial), 703.967.2751 (cell) or [email protected].
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