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Hydrotherapy: How it Works
The recuperative and healing properties of hydrotherapy are based on its mechanical and/or thermal effects. It exploits the body's reaction to hot and cold stimuli, to the protracted application of heat, to pressure exerted by the water and to the sensation it gives. The nerves carry impulses felt at the skin deeper into the body, where they are instrumental in stimulating the immune system, influencing the production of stress hormones, invigorating the circulation and digestion, encouraging blood flow, and lessening pain sensitivity.
Generally, heat quiets and soothes the body, slowing down the activity of internal organs. Cold, in contrast, stimulates and invigorates, increasing internal activity. If you are experiencing tense muscles and anxiety from your stress, a hot shower or bath is in order. If you are feeling tired and stressed out, you might want to try taking a warm shower or bath followed by a short, invigorating cold shower to help stimulate your body and mind.
When you submerge yourself in a bath, a pool, or a whirlpool, you experience a kind of weightlessness. Your body is relieved from the constant pull of gravity. Water also has a hydrostatic effect. It has a massage-like feeling as the water gently kneads your body. Water, in motion, stimulates touch receptors on the skin, boosting blood circulation and releasing tight muscles.
Proof it works
Various case reports, observational studies, and a number of controlled studies provide some evidence of success in the use of hydrotherapy.
In a study of 40 persons at University of Minnesota, 85% of the participants preferred a whirlpool bath to a still bath. Only whirlpool was effective in reducing the participants' reactivity to stress although both still and whirlpool baths were effective in reducing anxiety.