The effects of 9 weeks of daily chromium supplementation (200μg Cr as picolinate) were investigated in a double-blind design in football players during spring training. Testing was done pre-, mid-, and postsupplementation on the following criterion measures: urinary chromium excretion, girth and skinfold measures, percent body fat and lean body mass, and isometric and dynamic strength. With the exception of 2 variables (of 65 variables analyzed), no significant group by trials interactions were found (based on a repeated measures ANOVA). The two exceptions were unrelated and inconsequential. For 27 of the 38 subjects, average urinary chromium loss at pre was 0.36 μg/24 hr, whereas it was undetectable (< 0.1 μg/24 hr) for 10 subjects and excessive in 1 subject (2.4 μg/24 hr). Subjects receiving chromium supplements demonstrated urinary chromium losses five times greater than those in the placebo group at mid and post. Chromium picolinate supplementation was ineffective in bringing about changes in body composition or strength during a program of intensive weight-lifting training.
S.P. Clancy, P.M. Clarkson, P.S. Freedson, and B. Valentine are with the Department of Exercise Science, University of Massachusetts, Amherst, MA 01003. M.E. DeCheke is with the Microanalysis Laboratory of the Graduate School, and J.J. Cunningham is with the Department of Nutrition, University of Massachusetts, Amherst, MA 01003. K. Nosaka is with the, Institute of Sports Medicine, Yokohama City University, Yokohama, 236, Japan.