Cortisol and testosterone coupling: Enhanced hormone reactivity to intercollegiate athletic competition in women athletes.

In a variety of settings, cortisol and testosterone are positively "coupled." That is, within-person fluctuations of these hormones occur in parallel, with increases and decreases in one hormone corresponding to increases and decreases in the other. A dataset comprised of salivary cortisol and testosterone levels from varsity women athletes from six different Emory University sports teams (volleyball 2002, 2005, and 2008; softball 2004; tennis 2009; soccer 2013) was used to explore the relationship between coupling and hormone reactivity to athletic competition. In the majority of athletes, athletic competition was associated with increases in levels of salivary cortisol and testosterone occurring principally during the period between the start of warm-up and the end of competition. Athletes varied with respect to the degree that cortisol and testosterone were coupled. Athletes for whom these two hormones were strongly coupled showed substantially higher competition-related increases in cortisol and testosterone levels than athletes for whom these hormones were less strongly coupled. This heretofore undocumented relationship between hormone coupling and hormone reactivity in a sport setting is consonant with the idea that increases in cortisol and testosterone are parts of a coordinated and complementary response to the physical and/or psychological stress of athletic competition. Given that cortisol and testosterone, each in their own way(s) positively affect athletic performance, a singular benefit of cortisol/testosterone coupling may be an enhanced reactivity to competition, with a corresponding increase in the positive effects of each of these hormones on performance.