Normalisation of impaired neck muscle function after neck-specific exercises identified by speckle-tracking ultrasound analysis: a longitudinal case-control study of individuals with chronic whiplash-associated disorders compared with healthy controls.
Whiplash injury can impair neck muscle function, which is challenging to assess. Diagnostic ultrasound enables evaluation of musculoskeletal function and exercise effectiveness. To evaluate the function of five dorsal neck muscles before and after 12 weeks of neck-specific exercises in individuals with chronic whiplash-associated disorders (WAD), compared with healthy controls. Twenty-five individuals with WAD grades II and III and 25 age- and sex-matched controls participated in this study. The WAD group completed a 12-week neck-specific exercise programme. Outcome measures, collected at baseline in both groups and post-intervention in the WAD group, included neck muscle deformation (shortening and/or elongation) assessed by ultrasonography with speckle tracking analyses, neck disability (NDI; Neck Disability Index), neck pain (VAS; Visual Analogue Scale), and neck muscle fatigue (Borg CR-10). There was a significant difference in neck muscle deformation at baseline, with higher deformation in the WAD group compared with controls (F [1,214]=14.7, P<0.001). There was no significant difference in deformation between the groups after three months of neck-specific exercises in WAD compared with control baseline data F [1,200]=0.1, P=0.965), indicating restoration towards normal muscle function in the WAD group. The WAD group also improved in disability (NDI; mean 9.8, SD 8.4, P<0.001), neck pain (VAS; mean 12.1, SD 24.7, p=0.036), and fatigue (Borg CR-10; median 1.0, IQR; 0.5-2.5, P=0.019). The study indicates normalisation of dorsal neck muscle function in individuals with WAD after a neck-specific exercise programme.
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