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Continuous forearm cooling attenuates gastrointestinal temperature increase during cycling.
Eric T Hedge1, Kathryn A Zuj1, Alexander G Stothart2
1Department of Kinesiology, University of Waterloo, Waterloo, Ontario, Canada.
Journal of Sports Sciences
|November 17, 2020
Summary
Continuous inner forearm cooling effectively reduces gastrointestinal temperature (TGI) rise and cardiovascular strain during exercise in hot, humid environments. This method helps mitigate heat injury risk for athletes.
Area of Science:
- Exercise Physiology
- Environmental Health
- Thermoregulation
Background:
- Hot and humid conditions pose significant challenges to thermoregulation during physical activity.
- Heat strain can be exacerbated, increasing the risk of heat-related illnesses in athletes.
- Effective strategies for managing heat strain during exercise are crucial for performance and safety.
Purpose of the Study:
- To evaluate the impact of continuous inner forearm cooling on gastrointestinal temperature (TGI).
- To assess physiological responses, including cardiovascular drift and thermal comfort, during exercise in hot and humid conditions with forearm cooling.
- To determine the efficacy of inner forearm cooling in mitigating heat strain.
Main Methods:
- Eleven trained cyclists completed two experimental trials in a hot (30°C) and humid (70% RH) environmental chamber.
- Participants cycled at 66% of their functional threshold power for 45 minutes under a continuous inner forearm cooling (COOL) condition and a no-cooling (CONTROL) condition.
- Gastrointestinal temperature (TGI), heart rate, and perceived exertion were monitored throughout the trials.
Main Results:
- Continuous inner forearm cooling significantly attenuated the rise in gastrointestinal temperature (TGI) (COOL: 2.03°C·h⁻¹, CONTROL: 2.46°C·h⁻¹).
- A reduction in cardiovascular drift, indicated by a smaller change in heart rate, was observed in the COOL trial.
- End-exercise thermal comfort was improved, with a trend towards reduced rating of perceived exertion in the COOL trial.
Conclusions:
- Continuous inner forearm cooling is an effective strategy to reduce gastrointestinal temperature (TGI) during exercise in hot and humid environments.
- This cooling method can help mitigate physiological strain, including cardiovascular drift and perceived exertion.
- Inner forearm cooling shows promise in reducing the risk of heat injury during strenuous exercise in challenging thermal conditions.
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