Effect of EMG biofeedback on muscle activity in computer work

Aims of this study were to develop the biofeedback tool and to investigate its effects on the upper trapezius (UT) muscle activity during computer work. The biofeedback provided auditory and visual feedback in the electromyography (EMG) of the UT muscle and the degree of neck movements. Thirty-six computer users with mild to moderate pain in their upper trapezius muscles were recruited. The biofeedback group (n=18) and the control group (n=18) continuously performed typing tasks on the computer for 30 minutes. The results confirmed that the biofeedback group significantly reduced the UT muscle activity (p0.05) during computer work.