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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.
Context:
The training stress of heat acclimatization optimizing exercise performance in a hot environment can be demanding.
Objective:
This study evaluated the efficiency of different single heating protocols to elevate core temperature.
Design:
Nonrandomized controlled trial.
Setting:
Laboratory.
Patients Or Other Participants:
Ten male participants (age = 25 ± 3 years) performed 4 different 60-minute heating strategies at least 1 week apart.
Interventions:
Sixty minutes passive heating (PAS), 30 minutes active heating using a high-intensity bike protocol (HIBP) in a hot environment with 30 minutes passive heating (EH-PAS), 60 minutes HIBP in a hot environment (EH), or 60 minutes HIBP at room temperature (EM).
Main Outcome Measure(S):
Body core temperature and heart rate.
Results:
The highest peak gastrointestinal temperature occurred in EH-PAS (39.1 ± 0.4°C), followed by EH (38.9 ± 0.3°C), EM (38.4 ± 0.3°C), and PAS (38.1 ± 0.5°C). The average heart rate, measured as a control for intensity, was not different between exercise strategies (EH-PAS = 142 ± 12.3 beats per minute [bpm], EH = 146 ± 9.7 bpm, and EM = 142 ± 13.3 bpm; P > .05), but was different for PAS (98 ± 15.2 bpm; P < .05).
Conclusions:
Adding passive heating to a shorter exercise protocol can be just as effective in keeping core temperature elevated as exercise in the heat alone during a 60-minute session. Therefore, a single-bout combination of exercise and passive heating may result in a similar body temperature induction compared with exercise heat stress alone.
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