Index to Chiropractic Literature
Index to Chiropractic Literature
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ID 18802
  Title The effects of upper thoracic spinal manipulation on autonomic modulation of cardiovascular function in asymptomatic subjects during a cold pressor test [poster presentation; the Association of Chiropractic Colleges' Thirteenth Annual Conference, 2006]
URL
Journal J Chiropr Educ. 2006 Spring;20(1):57
Author(s)
Subject(s)
Peer Review Yes
Publication Type Meeting Abstract
Abstract/Notes INTRODUCTION: Dysfunction of somatic structures in the human spine may have a significant impact on neurological function, particularly the autonomic nervous system. No definitive research has clearly demonstrated a relationship between spinal manipulative therapy (SMT) and the modulation of cardiovascular autonomic function in the presence of acute nociceptive activity of somatic origin. The purpose of this investigation was to experimentally heighten cardiovascular sympathetic activity in asymptomatic subjects through the application of a cold pressor test and determine how such activity is modulated by SMT applied either during or immediately preceding the cold pressor test.

METHODS: Prior to data collection IRB approval was obtained from the New York Chiropractic College Institutional Review Board. Subjects (n=22) were seen in the autonomic laboratory on 4 separate occasions over a two-week period. On each visit, after obtaining baseline data a heightened cardiovascular-sympathetic response was evoked using the cold pressor test as the noxious stimulus. During the first visit subjects performed a cold pressor test. During the second, third and fourth visits, in a randomized order, subjects received a high velocity low amplitude spinal manipulative thrust to their upper thoracic spine either during or immediately preceding the cold pressor or repeated the cold pressor test without SMT. Power spectral analysis was performed on beat-to-beat R-R intervals (RRIHF) and continuous systolic blood pressure (SBPLF). Baroreceptor sensitivity was calculated . A Condition x Time repeated measures ANOVA was applied and using paired t-tests, post-hoc analyses were three pairwise comparisons among the three conditions.

RESULTS: Post-hoc comparisons detected significant differences for RRIHF, SBPLF and baroreceptor sensitivity between cold pressor and spinal manipulation prior to cold pressor conditions during the pressor test (26.8 „b 12.9 vs. 38 „b 14.5 msec2/Hz; 66.5 „b 16.1 vs. 55.4 „b 18.1 mmHg2/Hz; and 1.14 „b 0.78 vs. 1.02 „b 0.77 mmHg, respectively; p<0.01).

DISCUSSION: Our data suggest that SMT applied prior to a somato-autonomic provocation significantly reduced the sympathetic vasomotor response and attenuated cardiac vagal withdrawal.

This abstract is reproduced with the permission of the publisher.

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