Volume 30, Issue 1 (March 2026)
Physiol Pharmacol 2026, 30(1): 48-69 |
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Farahmand Farzaneh J, Bahrpeyma F, Lotfi M, Masjoodi S. Effect of upper cervical mobilization on activation
of sensory areas of the brain: an fMRI study in
migraine patients. Physiol Pharmacol 2026; 30 (1) :48-69
URL: http://ppj.phypha.ir/article-1-2476-en.html
URL: http://ppj.phypha.ir/article-1-2476-en.html
Abstract: (2201 Views)
Introduction: Given the sensory network dysfunction observed in migraine, this study aimed to investigate the effects of upper cervical mobilization on sensory brain activation using functional magnetic resonance imaging (fMRI) during trigeminal pain stimulation.
Methods: Thirty-nine migraine patients were randomized into an intervention group (n = 22), receiving upper cervical mobilization, or a sham group (n = 17). All participants underwent fMRI scans before and after ten sessions. Trigeminal pain was induced using intranasal ammonia, and pain intensity was rated using the Visual Analog Scale (VAS). Brain activity was analyzed in sensory-related regions, including the primary somatosensory cortex (S1), angular and supramarginal gyri, superior parietal lobule (SPL), and thalamus. Outcomes included mean Z-score (statistical strength of brain activation relative to background noise), percent signal change (PSC; percentage change in regional BOLD signal relative to baseline), voxel count (activation volume), and contrast of parameter estimates (COPE; amplitude of the trigeminal pain–related BOLD response). using ANCOVA (adjusted for baseline), with effect sizes reported using epsilon squared (ε²) or partial eta squared (η²).
Results: The mobilization group showed a greater pain reduction (Cohen’s d ≈ 2.60) than the sham group (r ≈ 0.64). Voxel count in bilateral supramarginal gyri decreased significantly (η² ≈ 0.21, 0.11), as did BOLD signal in right SPL (ε² ≈ 0.08). Right S1 activation deviation correlated with pain reduction (r = 0.69). Pain reduction also correlated negatively with thalamic PSC (ρ ≈ –0.36) and right angular gyrus COPD (ρ ≈ –0.35).
Conclusion: Upper cervical mobilization significantly reduced migraine pain and modulated activity in brain regions associated with pain and sensorimotor processing, suggesting a potential neurofunctional mechanism of action.
Type of Manuscript: Clinical research article |
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