title: Acute hormonal responses of a high impact physical exercise session in early postmenopausal women.
abstract: The effect of a single bout of exercise on hormones affecting bone metabolism was studied in 25 early postmenopausal women with osteopenia. The complex training session was performed between 8:00 a.m. and 9:05 a.m. Serum concentrations of dehydroepiandrosterone-sulfate (DHEA-S), total testosterone, free testosterone, 17beta-estradiol, cortisol, human growth hormone (hGH), insulin-like growth factor-I (IGF-I), and insulin-like growth factor binding protein-3 (IGFBP-3) were determined. Blood samples were obtained immediately before (baseline) and after exercise, as well as 2 h and 22 h post-exercise. DHEA-S increased by 10% immediately after exercise and remained increased 2 h later. Testosterone showed no increase immediately after exercise but fell by 21% 2 h post-exercise. Free testosterone was increased by almost 20% immediately after exercise and returned to baseline levels after 2 h. Two hours post-exercise a 20% increase in the estradiol level was measured. Cortisol decreased by 36% during exercise and a further 14% during the next 2 h, a loss higher than the normal diurnal decrease. hGH increased by 80% during exercise and fell 30% under baseline values after 2 h. Even though the assessment period was prolonged to 22 h no significant change could be demonstrated for IGF-I. Serum IGFBP-3 showed a biphasic increase. During the exercise session IGFBP-3 increased by 35%, returned to baseline values 2 h post-exercise and increased again by 40% 22 h post-exercise. In summary, this study showed that a single bout of exercise typically used in osteoporosis prevention programs could have an influence on hormones affecting bone metabolism.
mesh_terms: D000222:Adaptation, Physiological / Q000502:physiology; D000328:Adult; D001851:Bone Diseases, Metabolic / Q000150:complications / Q000503:physiopathology* / Q000517:prevention & control*; D015444:Exercise; D005080:Exercise Test / Q000379:methods; D005081:Exercise Therapy / Q000379:methods*; D005260:Female; D006728:Hormones / Q000097:blood*; D006801:Humans; D015663:Osteoporosis, Postmenopausal / Q000209:etiology / Q000503:physiopathology* / Q000517:prevention & control*; D017698:Postmenopause / Q000097:blood*; D013997:Time Factors
chemical_list: D006728:Hormones