A single mechanical pulse to the neck: Does it influence autonomic regulation of cardiovascular

Watanabe, N and Polus, B 2007, 'A single mechanical pulse to the neck: Does it influence autonomic regulation of cardiovascular', Chiropractic Journal of Australia, vol. 37, no. 2, pp. 42-48.


Document type: Journal Article
Collection: Journal Articles

Title A single mechanical pulse to the neck: Does it influence autonomic regulation of cardiovascular
Author(s) Watanabe, N
Polus, B
Year 2007
Journal name Chiropractic Journal of Australia
Volume number 37
Issue number 2
Start page 42
End page 48
Total pages 7
Publisher Chiropractors' Association of Australia
Abstract Objective: This study aims to examine the effects of a simulated cervical manipulation in the absence of any head movement on autonomic regulation of cardiovascular function in young healthy adults. Design: A pre- post-test study design. Setting: An acute laboratory-based study that examined the effect of application of a brief mechanical stimulus (simulating a chiropractic adjustment using an Activator® Instrument) to the neck on cardiac autonomic nervous and cardiovascular function. Participants: Eleven (11) young healthy adults completed this study. Intervention: A single mechanical impulse ("sham" or "authentic" manipulation procedure) was applied to the neck. Main Outcome Measures: Heart rate (HR), heart rate variability (HRV) and non-invasive beat-to-beat blood pressure (BP) were measured. Results: There were significant reductions in BP after application of the mechanical stimulus in the supine posture (p < .05). Particularly, the reductions peaked at 20 sec post-stimulation. Changes in HR and HRV parameters, however, were not significant in either supine or sitting posture (p > .05). Also there were no significant differences in responses between authentic and sham manipulation procedures. Conclusion: Our results showed that a mechanical stimulus applied to the upper cervical region is capable of acutely influencing cardiovascular function in young adults. The sham spinal manipulative procedure chosen for this study appeared to be contaminated with unspecified factors that had interventional effects, or the response might be due to an arousal reaction. This issue is being addressed in further investigations.
Subject Chiropractic
Keyword(s) Chiropractic
autonomic nervous system
heart rate
blood pressure
manipulation
ISSN 1036-0913
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