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Title: Impact of Prolonged Physical Training on the Pituitary Glucocorticoid Sensitivity Determined by Very Low Dose Intravenous Dexamethasone Suppression Test
Authors: Silva, T. S.
Longui, C. A.
Faria, C. D. C.
Rocha, M. N.
Melo, M. R.
Faria, T. G.
Souza e Almeida, J. A. de
Hayashi, L. F. [UNIFESP]
Kater, C. E. [UNIFESP]
Santa Casa São Paulo Fac Med Sci
Brazilian AF Acad Pirassununga
Universidade Federal de São Paulo (UNIFESP)
Keywords: HPA axis
glucocorticoid action
bioelectrical impedance
negative feedback
Issue Date: 1-Oct-2008
Publisher: Georg Thieme Verlag Kg
Citation: Hormone and Metabolic Research. Stuttgart: Georg Thieme Verlag Kg, v. 40, n. 10, p. 718-721, 2008.
Abstract: The activity of the hypothalamic-pituitary-adrenal axis is usually modulated by several stress factors, including exercise. Different responses are induced by physical training according to duration and intensity of exercise. During prolonged training, cortisol remains normal or decreased as a consequence of altered cortisol secretion, metabolism and excretion, and possibly by changes in glucocorticoid sensitivity. the aim of this study was to evaluate the impact of prolonged physical training on the glucocorticoid sensitivity. Eighteen cadets of the Air Force Academy, mean (SD) age: 18.7 (1.0) years, underwent an intensive 6-week preparatory training-period considered adequate by inducing significant changes on body composition measured by bioelectrical impedance. Measurement of individual's pituitary glucocorticoid sensitivity was done by an intravenous very low dose dexamethasone suppression test (20 mu g/m(2)) that was performed before and after the training period. Cortisol levels were obtained at basal condition and 120 minutes after the dexamethasone infusion. Basal cortisol showed a significant decrease after prolonged training. the percent cortisol suppression after dexamethasone tended to be lower after the training period. Overall, our data suggest that prolonged physical training is able to reduce glucocorticoid sensitivity, which can have a beneficial impact in chronic stress conditions.
ISSN: 0018-5043
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