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견관절 외전 각도에 따른 중간 및 하부 승모근의 근 활성도 비교
이원휘 ( Won Hwee Lee ),하성민 ( Sung Min Ha ),박규남 ( Kyue Nam Park ),김수정 ( Su Jung Kim ),원종혁 ( Jong Hyuck Won ),최흥식 ( Houng Sik Choi ) 한국전문물리치료학회 2011 한국전문물리치료학회지 Vol.18 No.1
The purpose of this study was to compare electromyography (EMG) activity for the middle and lower trapezius muscle according to various shoulder abduction angles. Thirty healthy male subjects were recruited for this study. Each subject performed three repetitions of horizontal abduction at 75°, 90°, 125°, 160°, and 180° of shoulder abduction angle in a prone position. Surface EMG activity was recorded from the middle and lower trapezius while the subjects held for five seconds at a predetermined position. The EMG activity was normalized using the maximal voluntary isometric contraction (MVIC) elicited using a manual muscle testing technique. A repeatedly measured ANOVA was performed by Bonferroni`s post hoc test. The EMG activity of the middle and lower trapezius was significantly different among shoulder abduction angles (p<.05). The greatest level of muscle activity for the middle and lower trapezius were demonstrated at 90° and 160° of shoulder abduction angle, respectively. These results suggest that middle and lower trapezius strengthening exercise and manual muscle testing should be performed at different shoulder abduction angles.
심부경부굴곡 운동 시 복근 수축이 표면경부굴곡근의 근활성도, 흉곽 거상, 두개경부굴곡 각도에 미치는 영향
박규남(Kyue-nam Park),원종혁(Jong-hyuck Won),이원휘(Won-hwee Lee),정성대(Sung-dae Chung),정도헌(Doh-heon Jung),오재섭(Jae-seop Oh) 한국전문물리치료학회 2009 한국전문물리치료학회지 Vol.16 No.3
The purpose of this study was to examine contraction of abdominal muscles on surface electromyographic (EMG) activity of superficial cervical flexors, rib cage elevation and angle of craniocervical flexion during deep cervical flexion exercise in supine position. Fifteen healthy subjects were participated for this study. All subjects performed deep cervical flexion exercise with two methods. The positions of two methods were no volitional contraction of abdominal muscles in hook-lying position with 45 degrees hip flexion (method 1) and 90 degrees hip and knee flexion with feet off floor for inducing abdominal muscle contraction (method 2). Surface EMG activities were recorded from five muscles (sternocleidmastoid, anterior scaleneus, recuts abdominis, external oblique, internal oblique). And distance of rib cage elevation and angle of craniocervical flexion were measured using a three dimensional motion analysis system. The EMG activitiy of each muscle was normalized to the value of reference voluntary contraction (%RVC). The EMG activities, distance of rib cage elevation, and angle of craniocervical were compared using a paired t-test between two methods. The results showed that the EMG activities of sternocleidmastoid and anterior scaleneus during deep cervical flexion exercise in method 2 were significantly decreased compared to method 1 (p<.05). Distance of rib cage elevation and angle of craniocervical flexion were significantly decreased in method 2 (p<.05). The findings of this study indicated that deep cervical flexion exercise with contraction of abdominal muscles could be an effective method to prevent substitute motion for rib cage elevation and contraction of superficial neck flexor muscles.