2007 Volume 34 Issue 1 Pages 33-39
Multi-feedback is a clinical method using more than one index which reflects a clinical condition of patient. It has an advantage that a patient can select indices which he or she thinks is more controllable. Until now, we have reported the effect of multi-feedback as clinical data but not as fundamental experiment data. The aim of this study was to investigate the effect of multi-feedback with applying three indices of frontalis muscle EMG, trapezius muscle EMG, and fingertip temperature for healthy university students. Thirty participants were randomly allocated to two groups: one given multi-feedback (BF group) and the other with no intervention (CO group). The session was administered once and consisted of 6 successive trials: a PreFeedback trial (PRE-FB), 4 Feedback trials (FB1 to FB4), and a POST-Feedback trial (POST FB). Multifeedback effect was examined with two-way ANOVA in each indices. As a result, significant main effect for trials showed that participants tended to decrease in frontalis muscle EMG, although there were no other significant effects. It was proven that frontalis muscle EMG is an index that has margin to learn acquisition of physiological responses toward desired direction. However, when multi-feedback is applied to healthy university students, a method enforcing to solve "law of initial value" in a trapezius must be taken in consideration. Moreover, in all indexes, it is possible that the effect of multi-feedback was not controlled completely in this study; therefore, further research will be necessary. Although Results showed not significant effect, BF group indicated greater responses in values of both EMGs and fingertip temperature than those of CO group. Effectiveness of Multi-feedback was confirmed.
