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Geriatria/Gerontologia/Idoso

Associação de Testosterona, DHEA e S-DHEA em homens idosos

30/03/2006

 

No trabalho abaixo chegou-se à conclusão que as concentrações críticas, níveis elevados de TT, T total, T biodispnível, DHEA e DHEAS estão associados com um aumento na performance física, como indicado pelo PPT. Entretanto, os níveis abaixo dessa concentração crítica, como podem ser alcançados por suplementação exógena, não aparentam conferir nenhum benefício adicional. Em geral, as concentrações hormonais não aparentam estar completamente associadas com a força de aperto ou escore de levantar da cadeira.

The Journal of Clinical Endocrinology & Metabolism Vol. 91, No. 2 425-431

Testosterone, Dehydroepiandrosterone, and Physical Performance in Older Men: Results from the Massachusetts Male Aging Study

Amy B. O’Donnell, Thomas G. Travison, Susan S. Harris, J. Lisa Tenover and John B. McKinlay

New England Research Institutes (A.B.O., T.G.T., J.B.M.), Watertown, Massachusetts 02472; Jean Mayer U.S. Department of Agriculture Human Nutrition Research Center on Aging, Tufts University (S.S.H.), Boston, Massachusetts 02111; and Emory University School of Medicine (J.L.T.), Atlanta, Georgia 30329

Address all correspondence and requests for reprints to: Dr. John B. McKinlay, New England Research Institutes, 9 Galen Street, Watertown, Massachusetts 02472. E-mail: jmckinlay@neriscience.com .

Objective: This manuscript examines the relationships of total testosterone (T), bioavailable T, dehydroepiandrosterone (DHEA), and DHEA sulfate (DHEAS) to measures of physical performance in a large, population-based, random sample of men.

Methods: In the most recent wave of the Massachusetts Male Aging Study, measures of strength and physical performance [seven-item physical performance test (PPT), timed chair stand test, and grip strength] were made in 684 men, aged 55–85 yr. Complete hormone data were also obtained. Initial graphical exploration of performance outcomes as a function of hormone levels showed linear increases in physical performance up to certain threshold hormone concentrations, beyond which the associations were diminished. Regression models were used to estimate threshold locations and standardized regression coefficients quantifying the association between hormones and strength.

Results: All hormones exhibited significant age-adjusted positive association with PPT score below, but not necessarily above, the thresholds. DHEA was positively associated with chair stand score below, but was not above the threshold. None of the hormones studied was significantly associated with grip strength.

Conclusion: Up to certain critical concentrations, elevated levels of TT, total T, bioavailable T, DHEA, and DHEA sulfate are associated with increased physical performance, as indicated by the PPT. However, levels beyond those critical concentrations, as might be achieved through exogenous supplementation, do not appear to confer any additional benefit. In general, hormone concentrations do not appear to be meaningfully associated with grip strength or chair stand scores.

The Journal of Clinical Endocrinology & Metabolism Vol. 91, No. 2 425-431


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