The patient is always advised to consult their doctor before trying hot water therapy to lower their blood pressure. This is because, the therapy initially increases the body’ blood pressure due to increased temperature of the body. Therefore people with high blood pressure should first consult their doctors before using this kind of water therapy simple using hot tub (ג׳קוזי).
However, hot water has a very positive effect on your body as it dilates the blood vessels. As the blood vessels dilate, the heart does not have to work hard in pumping blood in the vessels. The lowered activity in the heart provides an over-all relief to the high blood pressure patient. But for some patients such kind of relaxation is not optimal.
The reason because of which the blood vessels dilate when brought in contact with hot water is very simple. When your body comes in touch with hot water, there is reflex that goes to your brain with information that your body temperature has risen from the normal levels. Thus the vessels near the skin, which are in direct touch with the water relaxes and dissipates all heat outside the body. Thus all these developments in the body dilate the vessels.
It helps the blood in clearing itself from all the waste accumulated in it. With the day in progress, the food you eat and the physical activities that you perform, a lot of waste and harmful chemical substances get deposited in the body. With hot tub (בריכות ספא) treatment and the process of vasodilation, the blood reaches fast to the body parts and thus removes the waste products. This could again help lower your blood pressure.