This study was carried out in five Korean rabbits of 3 months old of age to investigate the temperature change in tissue by ultrasound therapy. Ultrasound was applied to gluteal area of rabbits with the intensity of 1.0 Watt/cm², 1.5 Watt/cm², 2.0 Watt/cm², and 3.0 Watt/cm² for 15 minutes. And the tissue temperature was measured with Thermister needle at skin, subcutaneous tissue, 1 cm depth muscle, 2∼3 cm depth muscle without media application, after media application for control, and this measurement was repeated in 2.5 minutes, 5.0 minutes, 7.5 minutes, 10.0 minutes and 15.0 minutes after ultrasound application.

With 1.0 Watt/cm², intensity, there was no temperature change in deep tissue but the temperature of skin was significantly increased after 15 minutes application.

With 1.5 Watt/cm², intensity, there was no temperature change in deep tissue but the temperature of skin was significantly increased after 2.5 minutes application.

With 2.0 Watt/cm², intensity, there was no temperature change in deep tissue, but the temperature of skin was significantly increased after 2.5 minutes application and the temperature of subcutaneous tissue was elevated after 15 minutes application.

With 3.0 Watt/cm², intensity, the temperature of 2∼3 cm depth muscle was significantly increased after 10 minutes application, and the temperature of 1 cm depth muscle and the temperature of subcutaneous tissue was significantly increased after 7.5 minutes application and the temperature of skin was elevated 2.5 minutes application.

These results show that the ultrasound therapy should be done with 3.0 Watt/cm2 for more than 7.5 minutes to induce the temperature elevation in deep tissue.