Focus on Research
EDITOR: ADRIAN B. WENBAN, B.SC., B.APP.SC., M.MED.SC.
Upper Cervical Spine Adjustments And Alterations In Heart Rate Variability In Healthy Young Adults
Budgell B, Hirano F. Auton Neurosci 2001;91:96-9.
This study examined the effects of chiropractic adjustments to the upper cervical spine, on heart-rate
variability(HRV), in a cohort of healthy young adults. The authors used a cross-over research design, to explore
and contrast changes in HRV in one group, who received a sham procedure, and another group who received
authentic chiropractic adjustment. The authors found that upper cervical
adjustments were associated with significant alterations in both heart rate and measures of heart-rate variability
compared to the control group. In particular, there was an increase in the ratio of low- frequency (LF)-to-high-
frequency (HF) components of the power spectrum of heart-rate variability, which likely reflect a shift in
balance between sympathetic and parasympathetic output to the heart.
ASRF Editor's comment: This is a very significant study which, although it raises more questions than it answers,
has now established a baseline from which to begin work, with a relatively new tool (Power Spectral Analysis of Heart
Rate Variability), in delineating the relationship between adjustment, subluxation and the autonomic nervous
Rear-End Collisions And Future General Health
Berglund A, Alfredsson L , Jensen I ,Cassidy DJ ,Nygren A. Journal of Clinical Epidemiology 2001;54:851-6.
A diversity of persistent health related problems have been documented in persons after suffering a motor vehicle
crash (MVC). A cohort study was conducted to determine whether exposure to a rear- end collision, with or
without whiplash injury, is associated with future health complaints. The objective of the present report was to
focus on outcomes other than neck pain. Included in the study were persons 18 to 65 years of age and covered
by traffic insurance at one of the largest in