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Journal of Clinical Endocrinology & Metabolism, Vol 63, 133-136, Copyright © 1986 by Endocrine Society
ARTICLES |
AL Villanueva, C Schlosser, B Hopper, JH Liu, DI Hoffman and RW Rebar
Because we previously found increased basal serum cortisol levels in women runners, we examined adrenocortical function in amenorrheic running women (AR), eumenorrheic running women (R), and normal nonexercising women (NC) in further detail. Mean 24-h urinary cortisol levels were significantly elevated (P less than 0.001) in six AR [45.1 +/- 7.2 (+/- SEM) micrograms/24 h] and eight R (38.5 +/- 6.9 micrograms/24 h) compared to four NC (13.9 +/- 2.8 micrograms/24 h). After adrenal suppression with 2 mg dexamethasone, integrated responses and absolute maximal elevations in serum cortisol levels in response to 10 micrograms/m2 exogenous ACTH (1-24) administered as an iv bolus dose, were not significantly different among six AR, six R, and six NC. This dose of ACTH results in maximal steroid release. The disappearance rates of cortisol (5 mg, iv) after dexamethasone suppression were similar in four AR, five R, and four NC and corresponded to a two- compartment model with mean half-lives of 4.9 and 93.8 min, respectively. Cortisol-binding globulin levels were also similar among the groups. These data document higher cortisol secretion and suggest increased ACTH secretion in running women.
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