John Ward1, Ken Tyer2, Jesse Coats3, Gabbrielle Williams1, Kristina Kulcak1. 1. Department of Physiology and Chemistry, Texas Chiropractic College, Pasadena, TX, USA. 2. Department of Technique, Texas Chiropractic College, Pasadena, TX, USA. 3. Department of Clinical Specialties, Texas Chiropractic College, Pasadena, TX, USA.
Abstract
PURPOSE: The aims of this study were to determine if there were any statistically significant immediate effects of upper thoracic spinal manipulative therapy (SMT) on cardiovascular physiology in hypertensive individuals. INTRODUCTION: Preliminary research suggests that SMT to various regions of the spine may be capable of lowering systolic and diastolic blood pressure in hypertensive individuals. Further studies are warranted to corroborate or refute these findings as well as measure how other attributes of cardiovascular physiology are impacted by SMT. METHODS:Fifty hypertensive participants (age = 45.5±13.9 years, height = 1.69±0.10 m, body mass = 93.9±21.5 kg: mean±standard deviation (SD)) were equally randomized into a single-blind, controlled trial involving two study groups: supine diversified anterior upper thoracic SMT of T1-4, or a 'no T-spine contact' control. Outcome measures were electrocardiogram, bilateral pulse oximetry, and bilateral blood pressure measurement performed at baseline, post 1-minute intervention, and post 10-minute intervention. An independent samples t-test was used to compare between-group differences at baseline. A repeated measures ANOVA was used to compare within-group changes over time. RESULTS: Within-group changes in PR interval and QRS duration demonstrated that the atria were transiently less active post-SMT and the ventricles were more active post-SMT, however the changes were clinically minimal. CONCLUSION: The results of this study, and the limited existing normotensive, thoracic-specific SMT research in this field, suggest that cardiovascular physiology, short-term, is not affected by upper thoracic spine SMT in hypertensive individuals to a clinically relevant level.
RCT Entities:
PURPOSE: The aims of this study were to determine if there were any statistically significant immediate effects of upper thoracic spinal manipulative therapy (SMT) on cardiovascular physiology in hypertensive individuals. INTRODUCTION: Preliminary research suggests that SMT to various regions of the spine may be capable of lowering systolic and diastolic blood pressure in hypertensive individuals. Further studies are warranted to corroborate or refute these findings as well as measure how other attributes of cardiovascular physiology are impacted by SMT. METHODS: Fifty hypertensiveparticipants (age = 45.5±13.9 years, height = 1.69±0.10 m, body mass = 93.9±21.5 kg: mean±standard deviation (SD)) were equally randomized into a single-blind, controlled trial involving two study groups: supine diversified anterior upper thoracic SMT of T1-4, or a 'no T-spine contact' control. Outcome measures were electrocardiogram, bilateral pulse oximetry, and bilateral blood pressure measurement performed at baseline, post 1-minute intervention, and post 10-minute intervention. An independent samples t-test was used to compare between-group differences at baseline. A repeated measures ANOVA was used to compare within-group changes over time. RESULTS: Within-group changes in PR interval and QRS duration demonstrated that the atria were transiently less active post-SMT and the ventricles were more active post-SMT, however the changes were clinically minimal. CONCLUSION: The results of this study, and the limited existing normotensive, thoracic-specific SMT research in this field, suggest that cardiovascular physiology, short-term, is not affected by upper thoracic spine SMT in hypertensive individuals to a clinically relevant level.
Authors: Pierre Côté; Jan Hartvigsen; Iben Axén; Charlotte Leboeuf-Yde; Melissa Corso; Heather Shearer; Jessica Wong; Andrée-Anne Marchand; J David Cassidy; Simon French; Gregory N Kawchuk; Silvano Mior; Erik Poulsen; John Srbely; Carlo Ammendolia; Marc-André Blanchette; Jason W Busse; André Bussières; Carolina Cancelliere; Henrik Wulff Christensen; Diana De Carvalho; Katie De Luca; Alister Du Rose; Andreas Eklund; Roger Engel; Guillaume Goncalves; Jeffrey Hebert; Cesar A Hincapié; Maria Hondras; Amanda Kimpton; Henrik Hein Lauridsen; Stanley Innes; Anne-Laure Meyer; David Newell; Søren O'Neill; Isabelle Pagé; Steven Passmore; Stephen M Perle; Jeffrey Quon; Mana Rezai; Maja Stupar; Michael Swain; Andrew Vitiello; Kenneth Weber; Kenneth J Young; Hainan Yu Journal: Chiropr Man Therap Date: 2021-02-17