When not used properly, devices that circulate water to provide hot or cold therapy can pose a risk of injury, especially cold-induced injuries.
Alternating Hot and Cold Therapy - Do's & Don'ts - Vive Health
Cold and Hot Water Therapy System - Circulating Personal Heat/Cooling Device by Aqua Relief with Universal Pad for Knee, Elbow, Shoulder, Back Pain, Aches, Swelling, Sprain, Injuries : Health & Household
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Scientific information on 7 Health benefits of the cold shower - Innovare Academic Sciences