The Neuromuscular Response to Spinal Manipulation in the Presence of Pain

• Published in: Journal of manipulative and physiological therapeutics 2016-05, Vol.39 (4), p.288-293
• Main Authors: Currie, Stuart J., DC, Myers, Casey A., MS, Durso, Catherine, PhD, Enebo, Brian A., DC, PhD, Davidson, Bradley S., PhD
• Format: Article
• Language: English
• Subjects: Adult; Back Muscles - physiopathology; Biomechanical Phenomena; Chiropractic; Electromyography; Humans; Kinetics; Low Back Pain; Low Back Pain - physiopathology; Lumbar Vertebrae - physiopathology; Manipulation; Manipulation, Spinal; Muscle Contraction - physiology; Physical Medicine and Rehabilitation; Reflex; Reflex - physiology; Spinal; Time Factors; Young Adult
• ISSN: 0161-4754; 1532-6586
• DOI: 10.1016/j.jmpt.2016.02.011

Abstract Objective The purpose of this study was to evaluate differences in muscle activity in participants with and without low back pain during a side-lying lumbar diversified spinal manipulation. Methods Surface and indwelling electromyography at eight muscle locations were recorded during lumbar side-lying manipulations in 20 asymptomatic participants and 20 participants with low back pain. The number of muscle responses and muscle activity onset delays in relation to the manipulation impulse were compared in the 2 pain groups using mixed linear regressions. Effect sizes for all comparisons were calculated using Cohen’s d. Results Muscle responses occurred in 61.6% ± 23.6% of the EMG locations in the asymptomatic group and 52.8% ± 26.3% of the symptomatic group. The difference was not statistically significant but there was a small effect of pain ( d = 0.350). Muscle activity onset delays were longer for the symptomatic group at every EMG location except the right side indwelling L5 electrode, and a small effect of pain was present at the left L2, quadratus lumborum and trapezius surface electrodes ( d = 0.311, 0.278, and 0.265) respectively. The indwelling electrodes demonstrated greater muscle responses ( P ≤ .01) and shorter muscle activity onset delays ( P < .01) than the surface electrodes. Conclusions The results revealed trends that indicate participants with low back pain have less muscle responses, and when muscle responses are present they occur with longer onset delays following the onset of a manipulation impulse.