2. Thermal action. After the human body absorbs the energy of ultrasound, the blood circulation of the skin accelerates, and a fever reaction can occur in the tissues. The generated heat has analgesic effects, relieves muscle spasms, and improves the micro circulation of the tissues;
3. Biological effects. Ultrasound can affect certain chemical or biological changes in the human body, alter enzyme activity, and thus alter the metabolic environment and state of the body, leading to the transformation of diseases towards a better direction.
4. Nervous system. The nervous system is sensitive to ultrasound, and low doses of ultrasound have an inhibitory effect on the nerves, which can slow down the conduction speed of the nerves and have a significant analgesic effect.