The Influence of Ice Slurry Ingestion on Maximal Voluntary Contraction Following Exercise-Induced Hyperthermia

Authors

Rodney Siegel, Edith Cowan University
Joseph Maté, Edith Cowan University
Greig Watson, Edith Cowan University
Kazunori Nosaka, Edith Cowan UniversityFollow
Paul B. Laursen, Auckland University of Technology

Document Type

Journal Article

Keywords

Thermoreception, Thermoregulation, Internal cooling, Isometric strength, Elbow flexors, Rectal temperature

Publisher

Springer

Faculty

Faculty of Computing, Health and Science

School

School of Exercise and Health Sciences / Centre for Exercise and Sports Science Research

RAS ID

12383

Comments

Siegel, R. , Mate, J. , Watson, G. , Nosaka, K. , & Laursen, P. B. (2011). The influence of ice slurry ingestion on maximal voluntary contraction following exercise-induced hyperthermia. European Journal of Applied Physiology, 111(10), 2517-2524. Available here

Abstract

The purpose of this study was to determine whether ingestion of a small bolus of ice slurry (1.25 g kg−1) could attenuate the reduction in maximal voluntary isometric contraction (MVC) torque output during a 2-min sustained task following exercise-induced hyperthermia. On two separate occasions, 10 males (age: 24 ± 3 years, V O2peak: 49.8 ± 4.7 ml kg−1 min−1) ran to exhaustion at their first ventilatory threshold in a hot environment (34.1 ± 0.1°C, 49.5 ± 3.6% RH). Prior to and after exercise, subjects performed a 2-min sustained MVC of the right elbow flexors in a thermoneutral environment (24.6 ± 0.8°C, 37.2 ± 4.5% RH). The post exercise MVC was performed immediately following the ingestion of either 1.25 g kg−1 of ice slurry (−1°C; ICE) or warm fluid (40°C; CON), in a counterbalanced and randomised order. Run time to exhaustion (42.4 ± 9.5 vs. 41.7 ± 8.7 min; p = 0.530), and rectal (39.08 ± 0.30 vs. 39.08 ± 0.30°C; p = 0.934) and skin temperatures (35.26 ± 0.65 vs. 35.28 ± 0.67°C; p = 0.922) and heart rate (189 ± 5 vs. 189 ± 6 beats min−1; p = 0.830) at the end of the run were similar between trials. Torque output during the post-exercise 2-min sustained MVC was significantly higher (p = 0.001) following ICE (30.75 ± 16.40 Nm) compared with CON (28.69 ± 14.88 Nm). These results suggest that ice slurry ingestion attenuated the effects of exercise-induced hyperthermia on MVC, possibly via internal thermoreceptive and/or temperature-related sensory mechanisms.

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