Ice slurry on outdoor running performance in heat
Yeo Z.W. Fan P.W.P. Nio A.Q.X. Byrne C. Lee J.K.W.
Yeo Z.W.
Fan P.W.P.
Nio A.Q.X.
Byrne C.
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Abstract
The efficacy of ingestion of ice slurry on actual outdoor endurance performance is unknown. This study aimed to investigate ice slurry ingestion as a cooling intervention before a 10km outdoor running time-trial. Twelve participants ingested 8gúkg -1 of either ice slurry (1.4øC; ICE) or ambient temperature drink (30.9øC; CON) and performed a 15-min warm-up prior to a 10km outdoor running time-trial (Wet Bulb Globe Temperature: 28.2ñ0.8øC). Mean performance time was faster with ICE (2715ñ396s) than CON (2730ñ385s; P=0.023). Gastrointestinal temperature (T gi) reduced by 0.5ñ0.2øC after ICE ingestion compared with 0.1ñ0.1øC (P<0.001) with CON. During the run, the rate of rise in T gi was greater (P=0.01) with ICE than with CON for the first 15min. At the end of time-trial, T gi was higher with ICE (40.2ñ0.6øC) than CON (39.8ñ0.4øC, P=0.005). Ratings of thermal sensation were lower during the cooling phase and for the first kilometre of the run (1.2ñ0.8; P<0.001). Although ingestion of ice slurry resulted in a transient increase in heat strain following a warm up routine, it is a practical and effective pre-competition cooling manoeuvre to improve performance in warm and humid environments. © Georg Thieme Verlag KG Stuttgart New York.
Keywords
endurance, heat, internal cooling, thermoregulation
Source Title
International Journal of Sports Medicine
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Date
2012
DOI
10.1055/s-0032-1304643
Type
Article