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Optimizing Cold-Water Immersion for Exercise-Induced Hyperthermia: An Evidence-Based Paper.
Emma A Nye1, Jessica R Edler1, Lindsey E Eberman1
1Department of Applied Medicine and Rehabilitation, Sycamore Center for Wellness and Applied Medicine, Indiana State University, Terre Haute.
Journal of Athletic Training
|July 22, 2016
Summary
Cold-water immersion (CWI) significantly accelerates cooling rates in hyperthermic individuals compared to passive recovery. Optimal CWI involves water temperatures below 10°C, immersing the torso and limbs for durations under 10 minutes.
Area of Science:
- Sports Medicine
- Environmental Physiology
- Thermoregulation
Background:
- Exercise-induced hyperthermia poses a significant risk.
- Effective cooling strategies are crucial for managing exertional heat stroke.
- Cold-water immersion (CWI) is a recognized method for rapid cooling.
Purpose of the Study:
- To determine optimal procedures for CWI to maximize cooling rates in hyperthermic individuals.
- To compare the efficacy of CWI against passive recovery for reducing core body temperature.
- To identify key variables influencing CWI effectiveness.
Main Methods:
- A meta-analysis of 19 peer-reviewed studies was conducted.
- Data were extracted on pre-immersion temperature, water temperature, ambient temperature, immersion duration, and immersion level.
- Risk of bias was assessed using the Physiotherapy Evidence Database (PEDro) scale.
Main Results:
- CWI increased cooling rates by 0.03°C/min compared to passive recovery.
- Cooling was more effective with pre-immersion core temperatures ≥38.6°C and immersion water temperatures ≤10°C.
- Torso and limb immersion yielded higher cooling rates than forearm and hand immersion.
Conclusions:
- CWI is twice as effective as passive recovery for cooling hyperthermic individuals, making it preferable for exertional heat stroke.
- Optimal CWI protocols include water temperatures <10°C and immersion of the torso and limbs.
- Further research is needed to support CWI of the forearms and hands.
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