[Evaluation on rebound effects when the forearm was exposed to cold air]

Cold exposure treatments including cryotherapy have been developed because of many physiological effects, one of which is the vascular hunting reaction called CIVD. In this study, CIVD was determined from the experiments where subject's right forearm was exposed to various air temperatures. The experiments were carefully designed to induce no pain during cold exposure. Three female and three male subjects participated in the experiments. The right forearm and hand of the subject were exposed to control/cold air temperatures of 30 degrees C/-10 degrees C, 15 degrees C/-15 degrees C, 40 degrees C/-20 degrees C and 25 degrees C/-35 degrees C. Blood flow in the middle finger and skin/core temperature at the middle of the forearm and back of the hand were measured simultaneously. Results showed that the exposure to -10 degrees C for 30 min may induce CIVD most effectively without pain as compared to the other given conditions.