Bull, A. J., Eckerson, J. M., & Moore, G. A. (2003). Effect of 30 days of creatine phosphate supplementation on the critical power test in men. Medicine and Science in Sports and Exercise, 35(5), Supplement abstract 2240.

Male recreational exercisers were randomly assigned to one of two supplement conditions; 20 g flavored dextrose powder as a placebo (N = 12), or 5 gm creatine citrate (phosphate) plus 2 gm monobasic sodium phosphate plus 2 gm monobasic potassium phosphate plus 18 gm of dextrose (N = 16). Each was dissolved in 16 ounces of water. Supplementation lasted 30 days. Ss were exposed to familiarity trials on a cycle ergometer when work estimates were calculated. Before supplementation a baseline trial to estimate critical power and anaerobic work capacity was performed. A trial to estimate any effects was performed after the supplementation period.

Creatine phosphate increased over the 30 days in all subjects combined. No other factors changed and no between-groups differences were revealed.

Implication. Creatine phosphate supplementation did significantly affect critical power or anaerobic work capacity in males.

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