Journal of Applied Physiology
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J Appl Physiol 84: 703-708, 1998;
8750-7587/98 $5.00
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Vol. 84, Issue 2, 703-708, February 1998

Effects of hormone replacement on growth hormone and prolactin exercise responses in postmenopausal women

R. R. Kraemer1, L. G. Johnson1, R. Haltom1, G. R. Kraemer1, H. Gaines2, M. Drapcho2, T. Gimple3 and V. Daniel Castracane3

1 Department of Kinesiology and Health Studies, Southeastern Louisiana University, Hammond 70402; 2 North Oaks Medical Center, Hammond, Louisiana 70403; 3 Department of Obstetrics and Gynecology, Texas Tech University Health Sciences Center, Amarillo, Texas 79106

Kraemer, R. R., L. G. Johnson, R. Haltom, G. R. Kraemer, H. Gaines, M. Drapcho, T. Gimple, and V. Daniel Castracane. Effects of hormone replacement on growth hormone and prolactin exercise responses in postmenopausal women. J. Appl. Physiol. 84(2): 703-708, 1998.---Exercise elevates growth hormone (GH) and prolactin (PRL) blood concentrations in premenopausal women. Postmenopausal women taking hormone replacement therapy (HRT) maintain higher estrogen levels that could affect GH and PRL. The purpose of the study was to determine the effects of HRT on GH and PRL responses to treadmill exercise. Seventeen healthy women who were postmenopausal (naturally or surgically) [8 on HRT; 9 not on HRT (NHRT)], completed 30 min of treadmill exercise at 79.16 ± 1.2% maximal O2 consumption (HRT group) and 80.19 ± 0.91% maximal O2 consumption (NHRT group). Blood samples were collected from an intravenous catheter during an exercise session and during a control session without exercise. GH and PRL concentrations were significantly higher in the exercise trial than in the nonexercise trial, whereas resting concentrations were similar for both trials. GH and PRL peaked at 10.8 ± 1.60 and 12.67 ± 2.58 ng/ml, respectively, for HRT subjects and at 4.90 ± 1.18 and 9.04 ± 2.17 ng/ml, respectively, for NHRT subjects. GH concentrations in the exercise trial were significantly higher for HRT than for NHRT subjects. This is the first study to demonstrate that HRT enhances treadmill-exercise-induced GH release and that similar PRL responses to treadmill exercise occur in postmenopausal women regardless of HRT status.

somatotropin; estrogen; menopause

The Journal of Applied Physiology 84(2):703-708
8750-7587/98 $5.00 Copyright © 1998 the American Physiological Society


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