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Open AccessArticle

Investigating the Effects of Chiropractic Spinal Manipulation on EEG in Stroke Patients

Mech-Sense, Department of Gastroenterology and Hepatology, Aalborg University Hospital, 9000 Aalborg, Denmark
Department of Clinical Medicine, Aalborg University, 9000 Aalborg, Denmark
Centre for Chiropractic Research, New Zealand College of Chiropractic, Auckland 1060, New Zealand
Faculty of Health & Environmental Sciences, Health & Rehabilitation Research Institute, AUT University, Auckland 0627, New Zealand
Centre for Sensory-Motor Interactions, Department of Health Science and Technology, Aalborg University, 9220 Aalborg, Denmark
Riphah College of Rehabilitation Sciences, Riphah International University, Islamabad 46000, Pakistan
Author to whom correspondence should be addressed.
Brain Sci. 2020, 10(5), 253;
Received: 2 April 2020 / Revised: 14 April 2020 / Accepted: 26 April 2020 / Published: 27 April 2020
(This article belongs to the Special Issue Brain Plasticity and Motor Control—Series II)
Objective: The purpose of this study was to evaluate the impact of chiropractic spinal manipulation on the early somatosensory evoked potentials (SEPs) and resting-state electroencephalography (EEG) recorded from chronic stroke patients. Methods: Seventeen male patients (53 ± 12 years old) participated in this randomized cross-over study. The patients received chiropractic spinal manipulation and control intervention, in random order, separated by at least 24 hours. EEG was recorded before and after each intervention during rest and stimulation of the non-paretic median nerve. For resting-state EEG, the delta-alpha ratio, brain-symmetry index, and power-spectra were calculated. For SEPs, the amplitudes and latencies of N20 and N30 peaks were assessed. Source localization was performed on the power-spectra of resting-state EEG and the N30 SEP peak. Results: Following spinal manipulation, the N30 amplitude increased by 39%, which was a significant increase compared to the control intervention (p < 0.01). The latency and changes to the strength of the cortical sources underlying the N30 peak were not significant. The N20 peak, the resting-state power-spectra, delta-alpha ratio, brain-symmetry index, and resting-state source localization showed no significant changes after either intervention. Conclusion: A single session of chiropractic spinal manipulation increased the amplitude of the N30 SEP peak in a group of chronic stroke patients, which may reflect changes to early sensorimotor function. More research is required to investigate the long-term effects of chiropractic spinal manipulation, to better understand what impact it may have on the neurological function of stroke survivors. View Full-Text
Keywords: chiropractic; stroke; electroencephalography; somatosensory evoked potentials; brain waves; spinal manipulation chiropractic; stroke; electroencephalography; somatosensory evoked potentials; brain waves; spinal manipulation
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Navid, M.S.; Niazi, I.K.; Lelic, D.; Nedergaard, R.B.; Holt, K.; Amjad, I.; Drewes, A.M.; Haavik, H. Investigating the Effects of Chiropractic Spinal Manipulation on EEG in Stroke Patients. Brain Sci. 2020, 10, 253.

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