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Erschienen in: European Journal of Applied Physiology 10/2011

01.10.2011 | Original Article

The influence of ice slurry ingestion on maximal voluntary contraction following exercise-induced hyperthermia

verfasst von: Rodney Siegel, Joseph Maté, Greig Watson, Kazunori Nosaka, Paul B. Laursen

Erschienen in: European Journal of Applied Physiology | Ausgabe 10/2011

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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, \( \dot{V}{\text{O}}_{{ 2 {\text{peak}}}} \): 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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Metadaten
Titel
The influence of ice slurry ingestion on maximal voluntary contraction following exercise-induced hyperthermia
verfasst von
Rodney Siegel
Joseph Maté
Greig Watson
Kazunori Nosaka
Paul B. Laursen
Publikationsdatum
01.10.2011
Verlag
Springer-Verlag
Erschienen in
European Journal of Applied Physiology / Ausgabe 10/2011
Print ISSN: 1439-6319
Elektronische ISSN: 1439-6327
DOI
https://doi.org/10.1007/s00421-011-1876-5

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