Abstract
A study was made of the effect of EMG feedback upon muscle relaxation. Twenty healthy subjects were divided into two groups of ten. The experimental group attempted to relax the forehead muscle with the aid of a tone, which change of pitch is proportional to the EMG activity in the forehead muscle. The control group attempted to do the same without receiving feedback. Each subject had five 30-min. training sessions on different days. The results obtained were as follows : 1. The experimental group succeeded in significantly decreasing the EMG activity in the forehead as compared with the control group. 2. Most of the experimental subjects felt that they were able to "loosen up " and that making efforts to relax did not help. In the control group, "I don't know if I became less tense." was the common comment. 3. No significant changes in heart or respiratory rate were apparent during the experiment.
