Biology of Sport
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Journal Abstract
 
Responses of saliva testosterone, cortisol, and testosterone-to-cortisol ratio to a triathlon in young and middle-aged males
CK Chang, HF Tseng, HF Tan, YD Hsuuw, J Lee-Hsieh
Biol Sport 2005; 22(3):227-235
ICID: 891493
Article type: Original article
IC™ Value: 10.26
Abstract provided by Publisher
 
Saliva testosterone and cortisol have been suggested to represent the biologically active forms of the respective hormones. This study investigated the acute responses of saliva testosterone, cortisol, and testosterone-to-cortisol ratio (T/C) after a triathlon in young and middle-aged recreationally-trained males. Thirty-five subjects were divided into the Young (18-35 years, n=12) or Middle-aged (MA, 40-56 years, n=23) group. Pre- and post-race saliva testosterone and cortisol concentrations were measured by radioimmunoassays. Baseline testosterone was lower in MA, compared to the Young group. Cortisol and T/C decreased significantly after the race in both groups. Testosterone increased after the race in MA. Race-induced change in T/C was correlated with age (r=-0.686, p<0.05) in the Young group and change in cortisol in both groups. (r=-0.729, p<0.01 in Young; r=-0.714, p<0.01 in MA). Race-induced change in testosterone was correlated with age (r=0.487, p<0.05). This study suggested that the decline in T/C after intensive endurance exercise may be more significant with advancing age until mid-30 s, then it may reach the plateau after the fourth decade of life. The age-related decline in testosterone may be temporarily normalized after intensive endurance exercise in middle-aged men. Race-induced change in cortisol was the major determinant of that in T/C.

ICID 891493
 
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