Heart Rate and Autonomic Nervous System Activity Relationship During Acupuncture Associated with Postural Change and Effect on Menopausal Symptoms: A Prospective Randomized Trial

ObjectiveThe autonomic nervous system (ANS) has been assessed using heart rate variability (HRV), and HRV has been used to evaluate acupuncture. This study investigated the relationship between heart rate (HR) and ANS activity during acupuncture and postural change. Materials and MethodsSubjects (48 menopausal women) were assigned randomly to acupuncture and sham groups. Japanese-style acupuncture at 7 points was performed weekly for 4 weeks. For sham treatment an acupuncture tube was pressed at the same 7 points. Measurements of HR were taken at: stage 1 (supine position before acupuncture; control); stage 2 (acupuncture for 10 minutes), and stage 3 (after standing for 10 minutes). During the experiments, the following HRV indices were obtained: high (0.15 - 0.40 Hz) frequency (HF) power and low frequency (LF) power/high frequency power ratio (LF/HF) as an index of the parasympathetic nervous system activity and sympathetic nervous system activity, respectively. Participants' menopausal symptoms were assessed using a visual analogue scale. ResultsReduction in HR during needle insertion and removal was significantly lower than that of retention (P