Neck kinematics and sternocleidomastoid muscle activation during neck
rotation in subjects with forward head posture |
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Authors: | Man-Sig Kim |
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Institution: | 1) Department of Systems Management Engineering, College of Engineering, Inje University, Republic of Korea |
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Abstract: | Purpose] The present study investigated differences in the kinematics of the neck and
activation of the sternocleidomastoid (SCM) muscle during neck rotation between subjects
with and without forward head posture (FHP). Subjects and Methods] Twenty-eight subjects
participated in the study (14 with FHP, 14 without FHP). Subjects performed neck rotation
in two directions, left and right. The kinematics of rotation-lateral flexion movement
patterns were recorded using motion analysis. Activity in the bilateral SCM muscles was
measured using surface electromyography. Differences in neck kinematics and activation of
SCM between the groups were analyzed by independent t-tests. Results] Maintaining FHP
increased the rotation-lateral flexion ratio significantly in both directions. The FHP
group had significantly faster onset time for lateral flexion movement in both directions
during neck rotation. Regarding the electromyography of the SCM muscles during neck
rotation in both directions, the activity values of subjects with FHP were greater than
those of subjects without FHP for the contralateral SCM muscles. Conclusion] FHP can
induce changes in movement in the frontal plane and SCM muscle activation during neck
rotation. Thus, clinicians should consider movement in the frontal plane as well as in the
sagittal plane when assessing and treating patients with forward head posture.Key words: Axial rotation, Cervical movement, Forward head posture |
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