Date of Award
Master of Science (MS)
Athletic Training – Post Professional Concentration
Dr. Sandra Fowkes-Godek PhD, LAT, ATC
Dr. Katherine Morrison PhD, LAT, ATC
Kathryn Courtney, ABD, ATC, CSCS
Context: Sweat rate (SwR) and sweat electrolyte (SwTE) composition are traditionally calculated/collected once in an exercise bout. The purpose of this study was to determine whether sweat collected at 30-min could accurately predict SwTE concentration at 120-min of continuous running; and if SwR at Hr1 accurately predicted SwR at Hr2, while subjects drank to thirst (Thirst) versus a generic schedule (Scheduled). Methods: Seventeen subjects (10M/7F) completed 2, 2-hr running trials at 60% of their max heart rate in a thermoneutral chamber. Scheduled followed 2000 NATA fluid replacement guidelines and Thirst drank water when they felt a deep-seated desire. SwR was calculated after each hr. Sweat samples by absorbent patch method were collected at 30-min and 90-min. 2x2 ANOVAs were used for hour, trial, and sex differences. P< .05. Results: Differences in SwR were observed between sexes (Thirst Males= 1.17+/- 0.39, Thirst Females= 0.75+/-0.21, Scheduled Males= 1.17+/-0.32, Scheduled Females= 0.86+/- 0.21, P= .01). SwTNa+ was different between Hr1(47.4+/-22.0mmol/l) and Hr2(51.9+/-22.7mmol/l) (P=0.004). SwtCl- was different between Hr1(38.60+/-20.50mmol/l) and Hr2(43.24+/-43.24mmol/l) (P=0.02). Body weight changes were observed between sexes (Thirst Males= -1.84+/-0.80, Thirst Females = -1.18+/-0.33, Scheduled Males= 0.45+/-0.75, Scheduled Females= 0.77+/-0.47, P=
Hunt, Danielle, "A Comparison of Sweat Rate and Sweat Electrolyte Concentrations Between the First and Second Hours of Running While Using Two Different Hydration Methods." (2019). West Chester University Master’s Theses. 1.