Physiological Responses to Osteopathic Manipulative Techniques in Healthy Young Adults

This study was designed to investigate the effect of selected osteopathic manipulative techniques (OMT) on cardiovascular functions in healthy young men and women. This work addressed questions regarding physiological responses to OMT in maintaining the cardiovascular homeostasis by (1) measuring changes in the cardiac autonomic nerves activity, (2) measuring changes in cardiovascular parameters such as blood pressure, cardiac contractility, and heart rate, and (3) investigating if changes in the cardiac autonomic nerves activity were related to changes in blood pressure, cardiac contractility, or heart rate. This controlled not-randomized pilot study with repeated measures was conducted at the Touro University Nevada College of Osteopathic Medicine. Healthy 21-35 years old students and employees volunteered in the study. The experimental group received the three cranial osteopathic manipulative techniques, occipital-atlantal decompression, occipital-mastoid decompression, and compression of the fourth ventricle, consecutively applied. This study included two control groups; one group received sham manipulations, and the second group did not receive any manipulations and was the non-touch group. The computerized MP150 BIOPAC System was used for data collection and analysis. The skin electrodes were used for the one-lead ECG and impedance cardiography. Digital data were recorded during the entire experimental protocol. The blood pressure was measured manually before and after the experimental procedure using blood pressure cuff and stethoscope. Cardiovascular responses to OMT were evaluated by using the heart rate variability test (HRV), calculating changes in cardiac contractility, and comparing changes in pre- and post- blood pressure readings. An analysis of variance (ANOVA) with a Bonferroni post-hoc test was used to evaluate treatment effects. The type I error rate (alpha) was set at 0.05.