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massage effect, that is, ultrasonic can produce a certain pressure on the human cells, so that the cells appear small movement, so as to change the state to achieve the purpose of treatment. thermal effect, that is, after the body absorbs the energy of ultrasonic wave, the blood circulation of the skin is accelerated, and there can be a fever reaction in the tissue. the heat generated has the effect relieving muscle spasm, and improving the microcirculation of the tissue..syi