The Effects of Different Hydration Strategies on Exercise Performance in the Heat.

Butler, Evie (2017) The Effects of Different Hydration Strategies on Exercise Performance in the Heat. Undergraduate thesis, University of Chichester.

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Abstract

Sweat evaporation provides the primary avenue of heat loss during vigorous exercise in hot weather; therefore, sweat losses can be substantial. Besides containing water, sweat contains electrolytes that are lost through the excretion of bodily fluids. If not appropriately replaced, water and electrolyte imbalances (dehydration and hyponatremia) can develop and adversely affect and individual’s exercise performance and perhaps health (Sawka & Noakes, 2007). It is clear that hydration strategies have effect exercise performance in the heat.
Objective: The aim of this study was to identify the effects of different hydration methods on exercise performance in the heat. Method: 9 male participants ages 20 ± 2.2 with a basic level of cycling ability completed a series of three 30-minute sessions of cycling in 34˚C heat; followed by a 5-minute average power test measuring average power output (APO) and total work done (TWD), during which they followed three hydration protocols. Participants wore sweat suits for the duration of the testing. A no water hydration protocol (NW); a forced drinking (F) protocol, participants consumed cups containing 200ml on three occasions; and an ab libitum (AL) condition, participants consumed water when they chose. Baseline measures were taken pre and post sessions to determine hydration status; urine colour (UCOL), specific gravity (USG) and mass (M). Measures of thermal comfort (TC), thirst (T), rate of perceived exertion (RPE) and gut fullness (GF) were collected. Results: Exercise in heat influenced performance over the period of time by increasing measures such as heart rate, peripheral temperature, thermal comfort and gut fullness but caused no significant effect. The 5-minute time trial found a significant decrease in performance; APO (p=0.0005), TWD (p=0.001). When partaking in the no water trial, performance was maintained in both the forced and ad libitum trials. No significant difference between groups was seen in any other measures, other than perception of thirst (p=0.055) during the 30-minute sub maximal exercise. This indicates performance can be maintained through the ad libitum fluid ingestion protocol and still perform similarly to a participant maintaining a forced ingestion protocol, thus ad libitum is an effective hydration strategy.

Item Type: Thesis (Undergraduate)
Additional Information: BA (Hons) Adventure Education
Subjects: G Geography. Anthropology. Recreation > GV Recreation Leisure
L Education > L Education (General)
Q Science > QP Physiology
Divisions: Departments > Adventure Education
Undergraduate Dissertations
Depositing User: Ann Jones
Date Deposited: 14 Dec 2017 10:39
Last Modified: 14 Dec 2017 10:39
URI: http://eprints.chi.ac.uk/id/eprint/3189

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