Increased neck muscle activity and impaired balance among females with whiplash-related chronic neck pain: A cross-sectional study
Birgit Juul-Kristensen, Brian Clausen, Inge Ris , Rikke Vikær Jensen , Rasmus Fischer Steffensen, Shadi Samir Chreiteh , Marie Birk Jørgensen , Karen Søgaard
Research Unit for Musculoskeletal function and Physiotherapy, University of Southern Denmark, 5230 Odense M, Denmark. E-mail: email@example.com
Objective: To investigate neck muscle activity and postural control in patients with whiplash-associated disorder compared with healthy controls.
Design: Cross-sectional study with convenience sampling.
Subjects: Ten females with whiplash-associated disorder (age 37. 7 years (21–58), neck pain > 2 years and Neck Disability Index (NDI) > 10) and 10 healthy female controls (age 35. 9 years (21–53), NDI < 6).
Methods: Surface electromyography measured muscle activity of the anterior scalene, sternocleidomastoid, neck extensors and upper trapezius muscles, expressed as mean relative activity related to maximum voluntary electromyography (%MVE). On a force plate, 3 balance tasks (Romberg stance with open and closed eyes, 1-legged stance) and a perturbation task with sudden unloading, were performed. The total area, areas from slow and fast components, and range of displacements were calculated from decomposed centre of pressure anterior-posterior and medial-lateral signals.
Results: During balance tasks with closed eyes and one-legged stance, the relative mean activity of all 4 muscles was significantly increased in whiplash-associated disorder compared with healthy controls. Postural sway was also significantly increased.
Conclusion: Increased neck muscle activity and increased postural sway during simple balance tasks indicate disturbed sensory feedback patterns in people with whiplash-associated disorder, which may have negative consequences when performing daily activities.
Do you want to comment on this paper? The comments will show up here and if appropriate the comments will also separately be forwarded to the authors.
You need to login/create an account to comment on articles. Click here to login/create an account