Abstract :
[en] [en] BACKGROUND: Altered cervical muscle recruitment is frequently reported in chronic neck pain, but the relative involvement of deep and superficial muscles during endurance tasks remains unclear. Muscle functional MRI allows non-invasive quantification of muscle recruitment in response to a standardized exercise.
OBJECTIVES: To investigate cervical muscle recruitment in response to the cervical extensor endurance test in individuals with and without chronic neck pain.
DESIGN: Cross-sectional laboratory-based study.
METHOD: Sixteen participants with chronic neck pain and thirteen matched controls performed a 3-min cervical extensor endurance test. T2-weighted MRI scans were acquired before and after exercise at C2/C3 and C7/T1. T2 shifts were calculated for nine bilateral cervical muscles. Perceived effort and post-test pain were recorded. Linear mixed-effects models assessed time, group, and interaction effects, and Cohen's d quantified changes.
RESULTS: All participants completed the test. Significant time effects were observed for deep cervical extensors at C7/T1 in both groups, with slightly greater post-exercise T2 shifts in controls. At C2/C3, sternocleidomastoid activation increased over time in both groups. Participants with neck pain showed numerically greater T2 shifts and larger effect sizes in superficial extensor muscles, but group × time interactions were not significant after correction for multiple comparisons. Perceived effort was higher in the neck pain group.
CONCLUSIONS: Deep cervical extensor activation during endurance testing appears preserved in individuals with neck pain, alongside more variable superficial muscle involvement and higher perceived effort. mfMRI provides mechanistic insight into cervical muscle behavior and may inform refinement of endurance test execution and termination criteria.
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