Winchester, J. B., Nelson, A. G., Stewart, L. K., & Stone, M. H. (2009). Testosterone to cortisol ratio shows strong relationship with adaptation to a strength and power training regimen in American-style collegiate football players. ACSM 56th Annual Meeting, Seattle, Washington. Presentation number 2410.

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This study examined the relationship between hormonal markers and performance measures and to establish whether or not alterations in performance were reflected through shifts in hormone profile. Freshman collegiate American-style football players (N = 22) were recruited for the study. Normal collegiate males (N = 10) were recruited as an experimental control. Performance testing included peak isometric force, rate of force development, broad jump, and vertical jump. Hormone values included free testosterone, cortisol, and testosterone to cortisol ratio. Following initial testing, treatment groups participated in seven weeks of strength and power training. Control group Ss were instructed not to participate in strength or power training during the course of the study.

Significant correlations were observed between pre-study testosterone to cortisol ratio and percent improvements in performance variables pre- to post-study.

Implication. The hormonal markers free testosterone, cortisol, and testosterone to cortisol ratio share significant correlation with indices of strength and power performance and that these relationships are sensitive to alterations in strength and power performance capabilities.

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