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J Appl Physiol 91: 680-686, 2001;
8750-7587/01 $5.00
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Vol. 91, Issue 2, 680-686, August 2001

Acute exercise effect on postabsorptive serum leptin

Jonathan S. Fisher1, Rachael E. Van Pelt2, Oren Zinder3, Michael Landt4, and Wendy M. Kohrt2

Departments of 1 Internal Medicine, 3 Pathology, and 4 Pediatrics, Washington University School of Medicine, St. Louis, Missouri 63110; and 2 Department of Medicine, University of Colorado Health Sciences Center, Denver, Colorado 80262

We postulated that high circulating cortisol levels during intense exercise would lead to increased serum leptin concentrations. Young, lean men ate a small meal and then exercised on a cycle ergometer for 41 min or rested on a control day. Serum leptin concentration was 10% greater during exercise than in the control condition (P < 0.05). Directly after exercise, serum leptin dropped to ~10% less than the control level (P < 0.05) but had recovered to the nonexercised level after ~2 h of recovery. Rapid exercise effects on circulating leptin were related to changes in hemoconcentration rather than changes in leptin mass. When serum leptin was normalized to serum protein, leptin increased by 10% in the exercise condition compared with control by the end of recovery (P < 0.05). Although exercise increased serum cortisol concentration threefold, there was no relation between differences in cortisol and exercise vs. control differences in normalized leptin. The increased leptin mass after exercise may have been related to greater plasma glucose concentration during recovery after exercise compared with the control condition.

cortisol; insulin; free fatty acids; epinephrine


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