Year of Award

2012

Document Type

Thesis

Degree Type

Master of Science (MS)

Degree Name

Health and Human Performance (Exercise Science Option)

Department or School/College

Department of Health and Human Performance

Committee Chair

Brent Ruby

Commitee Members

Chuck Dumke, Sara Scholtes

Keywords

ACCLIMATION, CORE TEMPERATURE, HEAT RELATED INJURY, INTERNAL COOLING, THERMOREGULATION

Publisher

University of Montana

Abstract

Purpose: To determine the effects of an ice slurry beverage on heat strain and thermoregulatory responses during prolonged exercise in the heat. Methods: Twenty males consumed slurry (ICE, -1.4 ± 0.2 °C), cold drink (COLD, -0.7 ± 0.2 °C), or room temperature drink (RT, 21.5 ± 1.0 °C), while walking at 50% of VO2max for 90 minutes in the heat (43.3 °C and 40% humidity). Heart rate (HR), core temperature (Tc), skin temperature (Ts), physiological strain index (PSI), sweat rate, and ratings of perceived exertion (RPE) were recorded. Results: Tc was lower at minutes 30, 60, and 90 during ICE (37.8 ± 0.1 °C, 38.3 ± 0.1 °C, 38.5 ± 0.1 °C) and COLD (37.8 ± 0.1 °C, 38.3 ± 0.1 °C, 38.7 ± 0.1 °C) vs. RT (37.9 ± 0.1 °C, 38.6 ± 0.1 °C, 39.2 ± 0.1 °C). HR was lower during ICE (138 ± 3) vs. RT (145 ± 3). PSI was lower in ICE at minutes 30, 60, and 90 (8.0 ± 0.3, 9.2 ± 0.4, 10.0 ± 0.4) and minutes 60 and 90 (9.2 ± 0.5, 10.0 ± 0.7) for the COLD compared to RT (8.4 ± 0.3, 10.3 ± 0.4, 11.5 ± 0.5). Ts and RPE were lower in the COLD vs. RT during the latter portion of the exercise. Sweat rate was lower during the ICE (11.81 ± 0.48 g·m-2·min-1) compared to the COLD (12.16 ± 0.51 g·m-2·min-1) and RT (12.95 ± 0.56 g·m-2·min-1). Conclusion: Ice slurry or a cold drink, reduces physiological strain during exercise in the heat and may act to decrease the acute risk for heat related injury.

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© Copyright 2012 Cory Emil Kaufman