Sympathetic and parasympathetic responses to specific diversified adjustments to chiropractic vertebral subluxations of the cervical and thoracic spine

doi:10.1016/j.jcm.2008.04.001

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J Chiropr Med. 2008 Sep; 7(3): 86–93.

Published online 2008 Sep 2. doi: 10.1016/j.jcm.2008.04.001

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Table 3

Heart rate variability components demonstrating percentage sympathetic and parasympathetic changes pre– to post–cervical or thoracic spinal segment adjustments

Components^⁎	Cervical Segments		% Change	Thoracic Segments		% Change
	Pre	Post		Pre	Post
	Subjects			Subjects
T Power^♂	524.4	434.7		874^♂	2216
LF (s)^†	150.8	188.9	0.67 ↑	433	1301	66.7 ↑
HF (p)	34.1	49.1	2.90 ↑	137	265	0.7 ↑
LF/HF	4.40	3.90^a		3.20	4.90^e
T Power^♀	2630	1540		3701^♂	1559
LF	1034	433	58.1 ↓	1659	406	75.5 ↓
HF	746	681	8.7 ↓	1547	363	76.5 ↓
LF/HF	1.40	0.60^b		1.07	1.11^f
T Power^♂	865	645		5868^♀	4002
LF	369	274	30.1 ↓	1829	2062	11.2 ↑
HF	141	192	26.5 ↑	3181	1308	58.9 ↓
LF/HF	2.60	1.40^c		0.60	1.60^g
T Power^♀	746	825
LF	214	241	11.2 ↑
HF	263	494	46.8 ↑
LF/HF	0.80	0.50^d

Data were derived from 4 participants given cervical adjustments when indicated and 3 given thoracic adjustments. Cervical adjustments were all C1, whereas thoracic adjustments were T1 for the first subject listed and T4 for the following two. ↓ indicates a decrease in power spectrum signal; ↑ indicates an increase in power spectrum signal.

^⁎Components of HRV. See “Methods” for descriptions.

^†LF represents sympathetic activity; HF represents parasympathetic activity.