earticle

영어

The purpose of this study was to investigate both relative muscle activity levels and ratios of local to global muscle activity, during bridging stabilization exercises. Twenty-fours healthy students volunteered to participate in this study. Subjects were required to complete the following four exercises: exercise 1, bridging position exercise: exercise 2, bridging position exercise with right leg lift exercise: exercise 3, bridging position exercise with right leg lift and hip/knee 0°∼90° flexion: exercise 4, bridging position exercise with right leg lift and swiss ball under leg, hip 0°∼30° abduction. Surface EMG signals were recorded from internal oblique (IO), rectus abdominal (RA), multifidus (MF), erecter spinae (ES) muscle during the exercises. RMS (root mean square) from selected trunk muscle was normalized by maximum voluntary isometric contraction (MVIC). One-way repeated of ANOVA with post-hoc Bonferroni`s correction was used to compare the differences in the muscle activity levels and ratios according to the types of exercise. The results of these muscles activites are as follows: The EMG activities of the muscles in exercise 2 showed significantly higher than those of muscle in exercise 1, 3, 4 (p<.05). The results of these muscles activity ratios are as follows: During all bridging exercises, the ratio of the IO/RA was very high due to relatively minimal activity of the rectus abdominis (RA). The relative muscle activity and the ratio of the back muscle demonstrated similar activity levels for all exercise. This study suggests that bridging exercise with leg lift is the most effective in lumbar bridging stabilization exercise. Also we provide useful information that will inform future studies on how bridging stabilization exercise affects muscle activity levels and ratios of local to global muscle activity.