심부경부굴곡 운동 시 복근 수축이 표면경부굴곡근의 근활성도, 흉곽 거상, 두개경부굴곡 각도에 미치는 영향

The purpose of this study was to examine contraction of abdominal muscles on surlace electromyo-graphic (EMG) activity of superficial cervical flexors, rib cage elevation and angle of craniocervical flex-ion 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, an-terior 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<.OS). Distance of rib cage elevation and angle of craniocervical flexion were significantly decreased in method 2 (p<.OS). 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.