Ice slurry ingestion does not enhance self-paced intermittent exercise in the heat.
This study aimed to determine if ice slurry ingestion improved self-paced intermittent exercise in the heat. After a familiarisation session, 12 moderately trained males (30.4 ± 3.4 year, 1.8 ± 0.1 cm, 73.5 ± 14.3 kg, V˙O2max58.5 ± 8.1 mL/kg/min) completed two separate 31 min self-paced intermittent protocols on a non-motorised treadmill in 30.9 ± 0.9 °C, 41.1 ± 4.0% RH. Thirty minutes prior to exercise, participants consumed either 7.5 g/kg ice slurry (0.1 ± 0.1 °C) (ICE) or 7.5 g/kg water (23.4 ± 0.9 °C) (CONTROL). Despite reductions in Tc(ΔTc: -0.51 ± 0.3 °C, P < 0.05) and thermal sensation prior to exercise, ICE did not enhance self-paced intermittent exercise compared to CONTROL. The average speed during the walk (CONTROL: 5.90 ± 1.0 km, ICE: 5.90 ± 1.0 km), jog (CONTROL: 8.89 ± 1.7 km, ICE: 9.11 ± 1.5 km), run (CONTROL: 12.15 ± 1.7 km, ICE: 12.54 ± 1.5 km) and sprint (CONTROL: 17.32 ± 1.3 km, ICE: 17.18 ± 1.4 km) was similar between conditions (P > 0.05). Mean Tsk, Tb, blood lactate, heart rate and RPE were similar between conditions (P > 0.05). The findings suggest that lowering Tcprior to self-paced intermittent exercise does not translate into an improved performance.
Institute of Sport and Exercise Science, University of Worcester, Worcester, UK.|Laboratory for Applied Human Physiology, Graduate School of Human Development and Environment, Kobe University, Kobe, Japan.
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Gerrett
Institute of Sport and Exercise Science, University of Worcester, Worcester, UK.
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Jackson
Institute of Sport and Exercise Science, University of Worcester, Worcester, UK.
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Yates
Institute of Sport and Exercise Science, University of Worcester, Worcester, UK.
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Thomas
D000328:Adult; D054874:Athletic Performance / Q000502:physiology*; D001831:Body Temperature; D004326:Drinking; D004435:Eating; D015444:Exercise / Q000502:physiology*; D005080:Exercise Test; D006339:Heart Rate; D006358:Hot Temperature; D006801:Humans; D007053:Ice; D019344:Lactic Acid / Q000097:blood; D008297:Male; D012420:Running / Q000502:physiology; D013697:Thermosensing
D007053:Ice; D019344:Lactic Acid
Pre-cooling; intermittent exercise; performance; self-pacing; team sports; thermoregulation