Abstract
Limited information exists on circulating testosterone (TEST) and cortisol(CORT) concentrations during conditions of hypohydration (HY). The purpose of this study was to examine the effects of HY (-5.6 ± 0.4% body weight) on plasma TEST, CORT, and the molar ratio of TEST/CORT, in response to running for 10 min (23°C T[Illegible Text]) at 70% and 85%˙VO2max in collegiate competitors. Nine male cross country runners(age, 19.8 ± 0.3 yr; VO2max, 65.7 ± 1.1 ml·kg-1·min-1) completed two sessions at both exercise intensities (random order); once in a euhydrated (EU) and once in a HY state. Blood samples were obtained via indwelling cannula preexercise(PRE), and immediate and 20 min postexercise (20 POST). Plasma TEST, CORT and TEST/CORT were unchanged from PRE values within any exercise session. However, plasma CORT was higher (p<.05) PRE (484 ± 30 nmol·l-1) and 20 POST (440 ± 37 nmol·l-1) in the HY condition, compared to EU (403 ± 29 & 325 ± 45 nmol·l-1, respectively), at both exercise intensities. Also, there was a decrease(p<.05) in TEST/CORT at 20 POST (0.05 ± 0.01 nmol·l-1) following the 70% ˙VO2max run during HY, compared to EU (0.07± 0.01 nmol·l-1). These results indicated that 1) HY caused greater plasma CORT concentrations, and 2) exercise in the HY state may have represented a more catabolic stressor, compared to EU.
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