Effects of Upper and Lower Cervical Spinal Manipulative Therapy on Blood Pressure and Heart Rate Variability in Volunteers and Patients With Neck Pain: A Randomized Controlled, Cross-Over, Preliminary Study

doi:10.1016/j.jcm.2014.12.005

PMC full text:

J Chiropr Med. 2015 Mar; 14(1): 1–9.

Published online 2015 Feb 7. doi: 10.1016/j.jcm.2014.12.005

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Table 3A

Pre- and Post-SMT Measures of Normalized Unit (nu) of Heart Rate Variability and the Ratio of Low Frequency (LF) to High Frequency (HF) in Volunteer's Group (n = 10)

	Pre-SMT	Post-SMT
Upper cervical
SDNN	83.54 ± 22	105.41 ± 20^a
nu LF	44.34 ± 14	36.36 ± 13^a
nu HF	40.18 ± 9	46.08 ± 14^a
LF/HF	1.04 ± 0.6	0.62 ± 0.5^a
Lower cervical
SDNN	85.89 ± 22	80.86 ± 20^b
nu LF	45.12 ± 9	53.81 ± 10^a,^b
nu HF	45. 85 ± 8	38.37 ± 12^a,^b
LF/HF	1.05 ± 0.7	1.51 ± 0.5^a,^b

Values are presented in mean ± SD.

SDNN, standard deviation of average normal to normal R-R intervals; SMT, spinal manipulative therapy.

^aP < .05, relative to baseline value.

^bP < .05 between upper and lower cervical SMT patients.