ARTICOLI ORIGINALI   

Gazzetta Medica Italiana Archivio per le Scienze Mediche 2015 March;174(3):113-21

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Effect of ice slurry ingestion during half-time breaks on intermittent exercise capacity and thermoregulation in the warm environment

Onitsuka S., Ueno T., Zheng X., Hasegawa H.

Graduate School of Integrated Arts and Sciences, Hiroshima University, Hiroshima, Japan

AIM: The purpose of this study was to investigate the effect of ice slurry ingestion during 15-min half-time breaks on repeated intermittent exercise capacity and thermoregulatory responses under warm environmental conditions.
METHODS: Eight male participants performed 30 sets of 1-min periods of intermittent exercise using a bicycle ergometer, each period consisting of 5 s of maximal pedaling, 25 s of pedaling with no workload, and 30 s of rest; the two sets of 30 min exercise block were separated by 15 min of rest at half-time. Subjects ingested 7.5 g/kg of ice slurry (−1°C; ICE) or cold water (4 °C; CON) during the 15-min half-time rest period.
RESULTS: After ice slurry or cold water ingestion, there were no differences between the two conditions with regard to temporal changes in peak power output during the 5-s maximal pedaling, which was measured as an index of exercise performance. However, rectal temperature in the ICE trial was significantly lower compared with that in the CON trial, with no reduction in power output immediately after the beginning of the second half. Moreover, the ratings of perceived exertion in the second half were significantly lower in the ICE trial than in the CON trial.
CONCLUSION: These results suggest that intermittent exercise performance was equivalent when ice slurry or cold water was ingested during the half-time break under warm environmental conditions; however, on ice slurry ingestion, the rectal temperature decreased significantly compared with that on cold water ingestion.