Effect of Chiropractic Care on Heart Rate Variability and Pain in a Multisite Clinical Study

Effect of Age and Sex on Heart Rate Variability in Healthy Subjects

“…Our own studies also showed a positive effect of chiropractic adjustment on HRV. 21,22 These efforts affect the long-term use of HRV in the chiropractic profession. There is a great need for establishing the normal HRV ranges in age and sex groups to provide guidance in the clinical application of HRV analysis.…”

Heart Rate Variability Modulation After Manipulation in Pain-Free Patients vs Patients in Pain

“…23,24 Finally, the LF/HF ratio is used to reflect the balance between the sympathetic nervous system and parasympathetic nervous system efferent tones. 10 Thus, a change in this score may indicate either a parasympathetic nervous system or a sympathetic nervous system tonal change.…”

“…[1][2][3][4] More recently, chiropractic researchers looked into autonomic nervous system (ANS) adaptations in an animal model after a mechanical stress to the spinal column, 5 a noxious mechanical stimulation, 6 or a spinal manipulation. 7 In the human model, several investigations have been done to measure modifications of heart rate variability (HRV) after cervical 8 and thoracic manipulations 9 or in a multisite clinical study 10 where details of the manipulation site were not provided. In these studies, [8][9][10] changes were observed in various HRV variables, whereas in 2 of those studies, 8,9 where sham groups were included, the sham conditions did not demonstrate any changes in the reported HRV parameters.…”

Effects of Biofreeze and chiropractic adjustments on acute low back pain: a pilot study

“…9,10 It has been reported that chiropractic adjustments improved HRV in a multiclinic study. 13 Tousignant-Laflamme and Marchand reported that patients with LBP had significant increase in heart rate and sympathetic activity. 14 Electromyogram (EMG) was used in the study to determine muscle activity in the LBP area.…”