Acute and Chronic Resistive Exercise Increase Urinary Chromium Excretion in Men as Measured with an Enriched Chromium Stable Isotope

Manuscript received 29 April 1997. Initial reviews completed 12 June 1997. Revision accepted 15 September 1997.

Michelle A. Rubin^*, John P. Miller, Alice S. Ryan, Margarita S. Treuth, Kristine Y. Patterson^**, Richard E. Pratley, Ben F. Hurley, Claude Veillon^**, Phylis B. Moser-Veillon^*, and Richard A. Anderson^**,

^* Department of Nutrition and Food Science,  Department of Kinesiology, University of Maryland, College Park, MD 21218; ^** USDA, Beltsville Human Nutrition Research Center, Nutrient Requirements and Functions Laboratory, Beltsville, MD 20705-2350; and  Division of Gerontology, Department of Medicine, University of Maryland at Baltimore, Baltimore VA Medical Center, Baltimore, MD 21201

Both exercise and chromium exert beneficial effects on insulin function. The mechanism by which exercise improves insulin response may involve an alteration in Cr metabolism. To determine the effects of acute and chronic resistive exercise on urinary Cr losses, we measured the effects of acute resistive exercise and 16 wk of resistive exercise training on urinary Cr losses of 10 men 53-63 y of age. Subjects consumed diets in compliance with the American Heart Association Phase I diet with a Cr content of 30 ± 4 µg/d. Sixteen weeks of resistive exercise training led to ~40% increases in upper and lower body strength, increases in fat-free mass and decreases in the percentage of body fat. An enriched stable isotope of Cr, ⁵³Cr, was employed to differentiate the exogenously administered Cr from the native endogenous Cr. Both acute and chronic resistive exercise increased ⁵³Cr losses. These data demonstrate that the improvements in body composition due to resistive exercise are associated with increased urinary Cr losses that are consistent with increased absorption.

The Journal of Nutrition Vol. 128 No. 1 January 1998, pp. 73-78
Copyright ©1998 by the American Society for Nutritional Sciences

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