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J Appl Physiol (September 20, 2002). doi:10.1152/japplphysiol.00693.2002
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Articles in PresS, published online ahead of print September 20, 2002
J Appl Physiol, 10.1152/jap.00693.2002
Submitted on July 29, 2002
Accepted on September 17, 2002

Effects of oral contraceptives on glucose flux and substrate oxidation rates during rest and exercise

Sang-Hoon Suh1, Gretchen A Casazza1, Michael A Horning1, Benjamin F Miller1, and George A Brooks1*

1 Exercise Physiology Laboratory, Department of Integrative Biology, University of California, Berkeley, Berkeley, CA, USA

* To whom correspondence should be addressed. E-mail: gbrooks{at}socrates.berkeley.edu.

We examined the effects of oral contraceptives (OC) on glucose flux and whole body substrate oxidation rates during rest (90 min) and two exercise intensities (60 min, leg ergometer cycling at 45 and 65% VO2peak). Eight healthy, eumenorrheic women were studied during the follicular (FP) and luteal (LP) phases before OC and the inactive (IP) and high dose (HP) phases after four months of a low-dose, tri-phasic OC. Subjects were studied in the morning 3h after a standardized (308 kcal) breakfast. There were significant reductions in glucose Ra and Rd during exercise of both intensities with OC, but not rest. There were no phase effects on substrate oxidation during rest or exercise. These results are interpreted to mean in women fed several hours prior to study, 1) OC decreases glucose flux, but not overall CHO and lipid oxidation rates during moderate-intensity exercise; and 2) synthetic ovarian hormone analogs in the doses contained in OC have greater metabolic effects on glucose metabolism during exercise than do endogenous ovarian hormones.




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