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Christopher Barnett, David L. Costill, Mathew D. Vukovich, Kevin J. Cole, Bret H. Goodpaster, Scott W. Trappe and William J. Fink

This study examined the effects of 14 days of L-camitine supplementation on muscle and blood camitine fractions, and muscle and blood lactate concentrations, during high-intensity sprint cycling exercise. Eight subjects performed three experimental trials: control 1 (CON I, Day 0), control I! (CON II, Day 14), and L-camitine (L-CN, Day 28). Each trial consisted of a 4-rain ride at 90% VO2max, followed by a rest period of 20 min, and thee five repeated 1-min rides at 115% VO2max (2 min rest between each). Following CON n, all subjects began dietary supplementation of L-camitine for a period of 14 days (4 g/day). Plasma total acid soluble and free camitine concentrations were significantly higher (p < .05) at all time points following supplementation. L-camitine supplementation had no significant effect on muscle camitine content and thus could not alter lactate accumulation during exercise.