Comparison of two different cooling systems in alleviating thermal and physiological strain during prolonged exercise in the heat

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This study compared the efficacy of an ice vest comprising of water (WATER) or a water-carbon (CARBON) emulsion on thermophysiological responses to strenuous exercise in the heat. Twelve male cyclists completed three 50-minute constant workload trials (55% of peak power output, ambient temperature 30.4 ± 0.6 °C) with WATER, CARBON and without ice vest (CONTROL), respectively. The increase in core body temperature (Tcore) was lower in WATER at 40 (-0.49 ± 0.34 °C) and 50 minutes (-0.48 ± 0.48 °C) and in CARBON at 30 (-0.41 ± 0.48 °C), 40 (-0.54 ± 0.51 °C), and 50 minutes (-0.67 ± 0.62 °C) as compared to CONTROL (P < 0.05, ES >0.8). While heart rate and blood lactate kinetics did not differ between the conditions, statistical main effects in favor of both WATER and CARBON were found for thermal sensation (condition P < 0.001 and interaction P < 0.01) and rating of perceived exertion (condition P < 0.05). Per-cooling with CARBON and WATER similarly reduced Tcore but not physiological strain during prolonged exercise in the heat.PRACTITIONER SUMMARY: Exercise in the heat is characterized by increases in thermophysiological strain. Both per-cooling with a novel carbon-based and a conventional water-based ice vest were shown to reduce core temperature significantly. However, due to its lower mass, the carbon-based system may be recommended especially for weight-bearing sports.

Original languageEnglish
Number of pages10
Publication statusE-pub ahead of print - 05.09.2020

ID: 5438028

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