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

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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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Ethical standards

The procedures performed within this experiment comply with the current laws of Australia.

Acknowledgments

This study was funded by the School of Exercise, Biomedical and Health Sciences, Edith Cowan University.

Conflict of interest

The authors declare that there are no conflicts of interest.

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Authors and Affiliations

  1. School of Exercise, Biomedical and Health Sciences, Edith Cowan University, 270 Joondalup Drive, Joondalup, WA, 6027, Australia

    Rodney Siegel, Joseph Maté, Greig Watson, Kazunori Nosaka & Paul B. Laursen

  2. New Zealand Academy of Sport, Auckland, New Zealand

    Paul B. Laursen

  3. Sport Performance Research Institute New Zealand (SPRINZ), Auckland University of Technology, Auckland, New Zealand

    Paul B. Laursen

Authors
  1. Rodney Siegel
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  2. Joseph Maté
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  3. Greig Watson
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  4. Kazunori Nosaka
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  5. Paul B. Laursen
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Corresponding author

Correspondence to Rodney Siegel.

Additional information

Communicated by Toshio Moritani.

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Siegel, R., Maté, J., Watson, G. et al. The influence of ice slurry ingestion on maximal voluntary contraction following exercise-induced hyperthermia. Eur J Appl Physiol 111, 2517–2524 (2011). https://doi.org/10.1007/s00421-011-1876-5

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  • DOI: https://doi.org/10.1007/s00421-011-1876-5

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