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Combined Active and Passive Isothermic Heating Leads to Similar Core Temperature Compared With Exercise Alone
Floris C Wardenaar1, Sonia Navarro1, Rachel Caballero1
1College of Health Solutions, Arizona State University, Phoenix.
Journal of Athletic Training
|October 16, 2024
Summary
Combining passive heating with shorter exercise protocols effectively elevates core body temperature, similar to prolonged exercise in heat. This offers a more efficient strategy for heat acclimatization.
Area of Science:
- Exercise Physiology
- Environmental Physiology
- Thermoregulation
Background:
- Heat acclimatization is crucial for optimizing exercise performance in hot environments.
- The training stress associated with heat acclimatization can be demanding for athletes.
Purpose of the Study:
- To evaluate the efficiency of different single heating protocols in elevating core body temperature.
- To compare passive heating, exercise in heat, and combined protocols.
Main Methods:
- A nonrandomized controlled trial was conducted in a laboratory setting.
- Ten male participants underwent four different 60-minute heating strategies.
- Protocols included passive heating (PAS), high-intensity bike protocol (HIBP) in heat with passive heating (EH-PAS), HIBP in heat (EH), and HIBP at room temperature (EM).
Main Results:
- The EH-PAS protocol induced the highest peak gastrointestinal temperature (39.1 ± 0.4°C).
- Exercise-based protocols (EH-PAS, EH, EM) showed similar average heart rates, while passive heating (PAS) resulted in a lower heart rate.
- Both EH-PAS and EH protocols effectively elevated core temperature.
Conclusions:
- Adding passive heating to a shorter exercise protocol is as effective as continuous exercise in heat for elevating core temperature.
- A single session combining exercise and passive heating can achieve similar body temperature induction as exercise heat stress alone.
- This suggests a potentially more time-efficient method for heat acclimatization.
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