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Pre-cooling moderately enhances visual discrimination during exercise in the heat
Neil D Clarke1, Michael J Duncan1, Mike Smith1
1a School of Life Sciences, Faculty Health and Life Sciences , Coventry University , Coventry , UK.
Journal of Sports Sciences
|March 24, 2016
Summary
Pre-cooling moderately improves visual discrimination accuracy during exercise in the heat. This intervention helps runners maintain better cognitive function when performing in hot conditions.
Area of Science:
- Exercise Physiology
- Environmental Physiology
- Cognitive Neuroscience
Background:
- Pre-cooling strategies are known to attenuate core temperature increases during exercise.
- However, the impact of pre-cooling on cognitive function, specifically visual discrimination, during exercise in heat remains underexplored.
Purpose of the Study:
- To investigate the effects of pre-cooling on visual discrimination performance in recreational runners exercising in a hot environment.
- To determine if pre-cooling influences core and skin temperature during heat exposure.
Main Methods:
- Eight male recreational runners underwent a randomized, counterbalanced crossover trial.
- Participants completed 90 minutes of treadmill running at 65% VO2max in heat (32.4°C, 46.8% r.h.).
- Pre-cooling involved 60 minutes of water immersion (20.3°C) versus a seated control condition. Visual discrimination tasks were administered every 30 minutes, alongside monitoring of rectal (Trec) and mean skin (Tskin) temperatures.
Main Results:
- Pre-cooling significantly reduced Trec and Tskin during the initial stages of exercise.
- Visual discrimination accuracy was moderately enhanced at 60 and 90 minutes of exercise following pre-cooling.
- While sensitivity, criterion, and bias showed small improvements, they did not reach statistical significance.
Conclusions:
- Pre-cooling is an effective strategy to moderately improve visual discrimination accuracy during prolonged exercise in the heat.
- The findings suggest that pre-cooling can help maintain cognitive performance under thermal stress.
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