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J Appl Physiol 82: 1946-1951, 1997;
8750-7587/97 $5.00
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Journal of Applied Physiology
Vol. 82, No. 6, pp. 1946-1951, June 1997
EXERCISE AND MUSCLE

Exercise-induced changes in circulating growth factors with cyclic variation in plasma estradiol in women

Mette Hornum, Dan M. Cooper, Jo Anne Brasel, Alina Bueno, and Kathy E. Sietsema

Departments of Medicine and Pediatrics, Harbor-UCLA Medical Center, Torrance, California 90509

Received 26 February 1996; accepted in final form 28 January 1997.

Hornum, Mette, Dan M. Cooper, Jo Anne Brasel, Alina Bueno, and Kathy E. Sietsema. Exercise-induced changes in circulating growth factors and cyclic variation in plasma estradiol in women. J. Appl. Physiol. 82(6): 1946-1951, 1997.---The effect of 10 min of high-intensity cycling exercise on circulating growth hormone (GH), insulin-like growth factors I and II (IGF-I and -II), and insulin-like growth factor binding protein 3 (IGF BP-3) was studied in nine eumenorrheic women (age 19-48 yr) at two different phases of the menstrual cycle. Tests were performed on separate mornings corresponding to the follicular phase and to the periovulatory phase of the menstrual cycle, during which plasma levels of endogenous estradiol (E2) were relatively low (272 ± 59 pmol/l) and high (1,112 ± 407 pmol/l), respectively. GH increased significantly in response to exercise under both E2 conditions. Plasma GH before exercise (2.73 ± 2.48 vs. 1.71 ± 2.09 µg/l) and total GH over 10 min of exercise and 1-h recovery (324 ± 199 vs. 197 ± 163 ng) were both significantly greater for periovulatory phase than for follicular phase studies. IGF-I, but not IGF-II, increased acutely after exercise. IGF BP-3, assayed by radioimmunoassay, was not significantly different at preexercise, end exercise, or at 30-min recovery time points and was not different between the two study days. When assayed by Western blot, however, there was a significant increase in IGF BP-3 30 min after exercise for the periovulatory study. These findings indicate that the modulation of GH secretion associated with menstrual cycle variations in circulating E2 affects GH measured after exercise, at least in part, by an increase in baseline levels. The acute increase in IGF-I induced by exercise appears to be independent of the GH response and is not affected by menstrual cycle timing.

human growth hormone; insulin-like growth factor I; insulin-like growth factor II

0161-7567/97 $5.00 Copyright © 1997 the American Physiological Society




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