{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,29]],"date-time":"2026-09-29T14:42:46Z","timestamp":1790692966923,"version":"4.1.0"},"reference-count":38,"publisher":"Wiley","issue":"7","license":[{"start":{"date-parts":[[2016,11,9]],"date-time":"2016-11-09T00:00:00Z","timestamp":1478649600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["PM&amp;R"],"published-print":{"date-parts":[[2017,7]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Background<\/jats:title><jats:p>Disturbance in neck muscle function is a well\u2010known complication of chronic nonspecific neck pain (CNNP). It is, however, unclear which muscles are more susceptible to functional impairment in patients with CNNP during upper limb tasks.<\/jats:p><\/jats:sec><jats:sec><jats:title>Objectives<\/jats:title><jats:p>To compare ultrasonographic changes in dorsal neck muscles thickness in patients with CNNP and asymptomatic controls while they performed a light load upper\u2010limb movement.<\/jats:p><\/jats:sec><jats:sec><jats:title>Design<\/jats:title><jats:p>Case control.<\/jats:p><\/jats:sec><jats:sec><jats:title>Setting<\/jats:title><jats:p>University research laboratory.<\/jats:p><\/jats:sec><jats:sec><jats:title>Participants<\/jats:title><jats:p>Twenty individuals with CNNP with a mean age of 23.35 \u00b1 2.94 and 20 asymptomatic controls with a mean age of 22.30 \u00b1 2.86, without any history of cervical diskopathy, fracture, trauma, inflammation, and spinal deformity were recruited for this study.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Ultrasonographic measurement of dorsal neck muscles thickness was performed during a light load 3\u2010second arm\u2010elevation task (shoulder scaption to 120\u00b0) in the 2 groups. Associations between pain intensity and patients' perceived disability and between pain intensity and muscle thickness also were evaluated at the state of rest.<\/jats:p><\/jats:sec><jats:sec><jats:title>Main Outcome Measurements<\/jats:title><jats:p>The thickness changes of the dorsal neck muscles throughout the arm elevation were calculated. The pain intensity and the patient's perceived disability also were measured.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>A significant main effect of muscle activity status was revealed for the multifidus and semispinalis cervicis and the splenius capitis, indicating an increase in their thickness throughout the arm elevation (<jats:italic>P<\/jats:italic> &lt; .001). The only muscle that showed a difference between groups was the multifidus (<jats:italic>P<\/jats:italic> = .007). Direct associations between pain and disability (r = .48, <jats:italic>P<\/jats:italic> = .03) and between pain and multifidus thickness (r = \u2212.49, <jats:italic>P<\/jats:italic> = .03) also were observed.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>The deteriorating effect of CNNP on the neck muscles targets the deep layer of the dorsal neck muscles (ie, the multifidus) more than the superficial muscles during light upper\u2010limb tasks.<\/jats:p><\/jats:sec><jats:sec><jats:title>Level of Evidence<\/jats:title><jats:p>III<\/jats:p><\/jats:sec>","DOI":"10.1016\/j.pmrj.2016.10.020","type":"journal-article","created":{"date-parts":[[2016,11,9]],"date-time":"2016-11-09T05:16:36Z","timestamp":1478668596000},"page":"699-706","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["Differential Activation of the Dorsal Neck Muscles During a Light Arm\u2010Elevation Task in Patients With 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