Torry, A., Penkman, M., Sellar, C., Field, C., Jelen, P., & Bell, G. (2003). The effect of whey protein supplementation and endurance training on natural killer cell cytotoxic activity in cyclists. Medicine and Science in Sports and Exercise, 35(5), Supplement abstract 558.

Male cyclists (N = 18) were assigned to either a placebo or whey protein supplementation group. Both groups completed the same training four times per week over six weeks.

There was no significant difference between the groups on any independent variable. Training improved performance and fitness indices irrespective of the supplementation group.

Implication. Whey protein supplementation does not have an ergogenic effect in training cyclists.

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