Some problems about the microwave therapy were discussed in this paper. In physical therapy, adequate heating of the deeper tissue without excessive heating of the superficial layer is desirable.
Comparison between tissue temperatures before and after exposure of microwave showed that the temperature in the depth of 5cm from skin rose to a peak (about 3°C higher than that before exposure) in first 15-20 minutes.
Exposure of microwave for 20 minutes on the stomach at a distance of 5cm from the skin showed no elevation of the temperature in the stomach cavity, and the rectal temperature also did not rise.
Two machines of the microwave therapy were compared in respect to the subjective feeling of heat and the grade of erythema of patients exposed by each machine. Some differences were found between them. From this reason it is necessary that the strict standard of the structure of the machine should be settled as soon as possible.
To observe the influence of the microwave upon the affected muscle, values of serum creatin phosphokinase and serun transaminase were measured in rabbits whose muscle was injured by injection of Trimeresurus venom. The results suggest that the microwave acts to accelerate the regeneration of the affected muscle in its chronic stadium and to accelerate its destruction in its acute stadium.