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Precooling does not Enhance the Effect on Performance of Midcooling with Ice-Slush/Menthol.
F Riera1, T T Trong1, K Rinaldi1
1Laboratoire ACTES - EA 3596, Université des Antilles et de la Guyane, Campus de Fouillole, Point à Pitre, France.
International Journal of Sports Medicine
|October 6, 2016
Summary
Internal precooling combined with midcooling did not improve cycling performance in heat. However, this combination reduced perceived exertion during the latter stages of exercise, suggesting potential benefits for prolonged physical activity.
Area of Science:
- Sports Science
- Environmental Physiology
- Exercise Physiology
Background:
- Internal cooling strategies, including precooling (PC) and midcooling (MC), are used to mitigate heat stress during exercise.
- The combination of PC and MC may offer synergistic benefits for thermoregulation and performance.
- Investigating the efficacy of combined internal cooling methods is crucial for optimizing athletic performance in hot environments.
Purpose of the Study:
- To determine if combining internal precooling (PC) with internal midcooling (MC) enhances cycling performance more than MC alone.
- To assess the effects of PC+MC on physiological and perceptual responses during prolonged cycling in hot and humid conditions.
Main Methods:
- Nine trained male cyclists completed two 30-km cycling time trials in a hot and humid environment (WBGT: 29°C).
- Participants consumed either a cool (23°C) or cold (3°C) beverage for 30 minutes before exercise (PC).
- During exercise, all participants consumed an ice-slush/menthol beverage (MC). Core temperature, heart rate, rating of perceived exertion, thermal sensation, and thermal comfort were measured.
Main Results:
- No significant difference in trial completion time was observed between the MC and PC+MC conditions.
- Precooling significantly reduced core temperature before exercise.
- During exercise, core temperature, heart rate, and thermal sensation/comfort did not differ, but rating of perceived exertion was lower in the later stages with PC+MC.
Conclusions:
- Internal precooling before exercise does not enhance subsequent cycling performance when combined with an ice-slush/menthol beverage during exercise.
- Despite no performance improvement, the combination of precooling and midcooling may reduce perceived exertion in the later stages of prolonged exercise.
- The PC+MC strategy warrants further investigation for its potential to improve tolerance to longer durations of exercise in the heat.
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