EFFECTS OF VARIOUS GROUND ANGLE ON SHOULDER MUSCLE ACTIVITY DURING SHOULDER PROTRACTION EXERCISE

The purpose of this study was to examine differences in surface electromyography (EMG) activities in upper trapezius, pectoralis major, and serratus anterior muscles during shoulder protraction exercise with various ground angle. The research subjects included 16 healthy participants (M=10, F=6) who volunteered. All subjects were measured EMG activities in the serratus anterior, upper trapezius, and pectoralis major during performance of shoulder protraction exercise on a surface at 0° tilt, 30° tilt, 60° tilt, and 90° tilt, respectively. Statistical analysis was performed one-way analysis of variance (ANOVA). There was significant difference in the serratus anterior (ｐ＜0.05). The results of post-hoc analysis showed significantly greater value of serratus anterior on a surface at a 0° tilt angle than at 60° and 90° tilt angles (ｐ＜0.05). This study suggest that performance of shoulder protraction exercise on the 0°angled ground can be regarded as the best choice to strengthen the serratus anterior with healthy adults.