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The Effects of Spinal Manipulation on Motor Unit Behavior

Laboratoire d’Automatique, de Mécanique et d’Informatique Industrielles et Humaines (LAMIH UMR CNRS 8201), Université Polytechnique Hauts-de-France, F-59313 Valenciennes, France
Faculty of Electrical Engineering and Computer Science, University of Maribor, SI-2000 Maribor, Slovenia
Centre de Recherche Cerveau et Cognition, Université de Toulouse, UPS, 31052 Toulouse, France
The Brain and Cognition Research Center (CerCo), CNRS UMR 5549, 31052 Toulouse, France
Health and Rehabilitation Research Institute, AUT University, Auckland 0627, New Zealand
Centre for Chiropractic Research, New Zealand College of Chiropractic, Auckland 1060, New Zealand
Department of Health Science and Technology, Aalborg University, 9220 Aalborg, Denmark
Author to whom correspondence should be addressed.
Brain Sci. 2021, 11(1), 105;
Received: 16 December 2020 / Revised: 8 January 2021 / Accepted: 12 January 2021 / Published: 14 January 2021
Over recent years, a growing body of research has highlighted the neural plastic effects of spinal manipulation on the central nervous system. Recently, it has been shown that spinal manipulation improved outcomes, such as maximum voluntary force and limb joint position sense, reflecting improved sensorimotor integration and processing. This study aimed to further evaluate how spinal manipulation can alter neuromuscular activity. High density electromyography (HD sEMG) signals from the tibialis anterior were recorded and decomposed in order to study motor unit changes in 14 subjects following spinal manipulation or a passive movement control session in a crossover study design. Participants were asked to produce ankle dorsiflexion at two force levels, 5% and 10% of maximum voluntary contraction (MVC), following two different patterns of force production (“ramp” and “ramp and maintain”). A significant decrease in the conduction velocity (p = 0.01) was observed during the “ramp and maintain” condition at 5% MVC after spinal manipulation. A decrease in conduction velocity suggests that spinal manipulation alters motor unit recruitment patterns with an increased recruitment of lower threshold, lower twitch torque motor units. View Full-Text
Keywords: high-density surface electromyography; chiropractic; electromyography decomposition; motor unit high-density surface electromyography; chiropractic; electromyography decomposition; motor unit
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MDPI and ACS Style

Robinault, L.; Holobar, A.; Crémoux, S.; Rashid, U.; Niazi, I.K.; Holt, K.; Lauber, J.; Haavik, H. The Effects of Spinal Manipulation on Motor Unit Behavior. Brain Sci. 2021, 11, 105.

AMA Style

Robinault L, Holobar A, Crémoux S, Rashid U, Niazi IK, Holt K, Lauber J, Haavik H. The Effects of Spinal Manipulation on Motor Unit Behavior. Brain Sciences. 2021; 11(1):105.

Chicago/Turabian Style

Robinault, Lucien, Aleš Holobar, Sylvain Crémoux, Usman Rashid, Imran K. Niazi, Kelly Holt, Jimmy Lauber, and Heidi Haavik. 2021. "The Effects of Spinal Manipulation on Motor Unit Behavior" Brain Sciences 11, no. 1: 105.

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