Stressbusters: a pilot study investigating the effects of OMT on stress management in medical students

Abstract

Context Medical students report high levels of perceived stress and burnout, especially during the preclinical years. The combination of physical stressors from poor posture, poor sleep quality, and mental stressors from the rigorous curriculum stimulates the sympathetic nervous system (SNS) to secrete cortisol. Previous studies have shown that persistent elevated cortisol levels are associated with negative health outcomes. Objectives We conducted an Institutional Review Board (IRB)-approved study to determine if regular osteopathic manipulative treatments (OMTs) could impact the stress levels of first-year osteopathic medical students (OMSs) at Touro College of Osteopathic Medicine (TouroCOM) Harlem campus by measuring physiologic stress through changes in weekly salivary cortisol levels, perceived emotional and psychological stress levels, and cognitive function. Methods We recruited 10 first-year OMSs who were not currently receiving external OMT outside of weekly coursework; other forms of external stress management, such as yoga or meditation, were not controlled for in this study. Utilizing a random number generator, the 10 student respondents were split into a control group that received no treatment and a treatment group that received 15 min of weekly OMT for 6 weeks. The treatment consisted of condylar decompression, paraspinal inhibition, and supine rib raising, which are techniques that are known to balance the SNS and parasympathetic nervous system (PNS). Cortisol levels were quantified by enzyme-linked immunosorbent assay (ELISA) cortisol immunoassay via salivary samples collected at the beginning of each weekly session, prior to treatment for the treatment group, at the same time of day each week. We also measured participants’ weekly subjective perception of stress utilizing the College Student Stress Scale (CSSS) and cognitive function utilizing the Lumosity Performance Index (LPI). We conducted a two-tailed, unpaired t-test as well as a U test for the cortisol levels, given the smaller sample size and potential for a nonnormal distribution. Results A lower cortisol level was correlated to a higher optical density (OD), the logarithmic measure of percent transmission of light through a sample; analysis of our data from the ELISA cortisol immunoassay showed an average weekly change in OD (∆OD) for the treatment group of 0.0215 and an average weekly ∆OD of −0.0044 in the control group. The t-test showed p=0.0497, and our U test showed a p=0.0317. Both tests indicated a statistically significant decrease across the weekly salivary cortisol levels in the treatment group utilizing a p<0.05. An additional effect-size analysis supported our finding of a significant decrease in weekly cortisol levels in the treatment group, Cohen’s d=1.460. Based on the CSSS responses, there was no significant difference in perceived stress between the control and treatment groups (p=0.8655, two-tailed). Analysis of the LPI revealed no statistically significant difference in cognitive performance (p=0.9265, two-tailed). Conclusions Our study supports the claim that OMT that targets the SNS and PNS has a significant impact on cortisol levels. While the reduction in cortisol levels was statistically significant, the broader physiological impact remains unclear. Further research is necessary to determine whether this reduction translates to meaningful clinical benefits.