Date of Award

Spring 2019

Document Type

Thesis Restricted

Degree Name

Master of Science (MS)


Athletic Training – Post Professional Concentration

Committee Chairperson

Sandra Fowkes Godek, Ph.D.

Committee Member

Katherine Morrison, Ph.D., LAT, ATC

Committee Member

Morgan Worley, M.S.


Context: Both male and female endurance athletes tend to follow hydration strategies instead of their thirst mechanism to minimize dehydration or improve performance. The purpose was to examine sex differences in the physiological effects of drinking to thirst (Thirst) versus a generic schedule (Scheduled) during running. Methods: In a randomized crossover study, 22 (11 males, 11 females) trained endurance runners completed two experimental trials running for 2 hours at 60% VO2max in a climate-controlled chamber (22˚C and 40% RH). In Thirst, participants only drank when they felt a deep-desire of thirst. In scheduled, participants followed the 2000 NATA fluid replacement guidelines. Blood electrolytes, core temperature, body weight change, urine volume, fluid volume, sweat rate, and performance time were recorded during the trials. Data was analyzed by two-way and one-way ANOVA and PBlood sodium showed a significant difference between FS and MS (P