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Article type: Research Article
Authors: Park, Kyue-Nama | Kwon, Oh-Yunb; * | Kim, Su-Jungc | Kim, Si-Hyund
Affiliations: [a] Department of Physical Therapy, College of Medical Science, Jeonju University, Korea | [b] Laboratory of Kinetic Ergocise Based on Movement Analysis, Department of Physical Therapy, College of Health Science, Yonsei University, Wonju, Korea | [c] KEMA Healing Center, Daejeon, Korea | [d] Department of Physical Therapy, Yonsei University, Wonju, Korea
Correspondence: [*] Corresponding author: Oh-Yun Kwon, Laboratory of Kinetic Ergocise based on Movement Analysis, Department of Rehabilitation Therapy, Graduate School, Yonsei University, 234 Maeji-ri, Heungeop-Myeon, Wonju, Kangwon-Do, 220-710, Korea. Tel.: +82 33 760 2721; Fax: +82 33 760 2496; E-mail:[email protected]
Abstract: BACKGROUND: Although unilateral posterior neck pain (UPNP) is more prevalent than central neck pain, little is known about how UPNP affects neck motion and the muscle activation pattern during prone neck extension. OBJECTIVE: To investigate whether deviation in neck motion and asymmetry of activation of the bilateral cervical paraspinal muscles occur during prone neck extension in subjects with UPNP compared to subjects without UPNP. METHODS: This study recruited 20 subjects with UPNP and 20 age- and sex-matched control subjects without such pain. Neck motion and muscle onset time during prone neck extension were measured using a three-dimensional motion-analysis system and surface electromyography. RESULTS: The deviation during prone neck extension was greater in the UPNP group than in the controls (p < 0.05). Compared with the controls, cervical extensor muscle activation in the UPNP group was significantly delayed on the painful side during prone neck extension (p < 0.05). CONCLUSIONS: Subjects with UPNP showed greater asymmetry of neck motion and muscle activation during prone neck extension compared with the controls. This suggests that UPNP has specific effects on neck motion asymmetry and the functions of the cervical extensors, triggering a need for specific evaluation and exercises in the management of patients with UPNP.
Keywords: Asymmetry, neck motion, prone neck extension, surface EMG, unilateral posterior neck pain
DOI: 10.3233/BMR-150378
Journal: Journal of Back and Musculoskeletal Rehabilitation, vol. 30, no. 4, pp. 751-758, 2017
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