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 3B

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 Patient’s Group (n = 10)

	Pre-SMT	Post-SMT
Upper cervical
SDNN	70.48 ± 18^a	90.23 ± 20^b
nu LF	52.89 ± 7	38.38 ± 6^b
nu HF	41.18 ± 7	48.54 ± 8^b
LF/HF	1.33 ± 0.3^a	0.81 ± 0.2^b
Lower cervical
SDNN	75.19 ± 16^a	97.52 ± 22^b
nu LF	49.13 ± 14	39.44 ± 13^b
nu HF	44. 13 ± 8	53.25 ± 12^b
LF/HF	1.22 ± 0.4^a	0.86 ± 0.3^b

Values are presented in mean ± SD.

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

^aP < .05 between volunteer and patient groups.

^bP < .05, relative to baseline value.