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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

ComponentsCervical Segments
% ChangeThoracic Segments
% Change
Pre
Post
Pre
Post
SubjectsSubjects
T Power524.4434.78742216
LF (s)150.8188.90.67 ↑433130166.7 ↑
HF (p)34.149.12.90 ↑1372650.7 ↑
LF/HF4.403.90a3.204.90e
T Power2630154037011559
LF103443358.1 ↓165940675.5 ↓
HF7466818.7 ↓154736376.5 ↓
LF/HF1.400.60b1.071.11f
T Power86564558684002
LF36927430.1 ↓1829206211.2 ↑
HF14119226.5 ↑3181130858.9 ↓
LF/HF2.601.40c0.601.60g
T Power746825
LF21424111.2 ↑
HF26349446.8 ↑
LF/HF0.800.50d

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.
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