Evaluation of a Tai Chi Resilience Training Program on Objective and Subjective Measures of Post Traumatic Stress Disorder Severity

Post-traumatic stress disorder (PTSD) affects an estimated 4.7% of the United States population every year, leading to increased rates of disability, suicide, substance use, and interpersonal difficulties. Mindfulness interventions for PTSD offer a low-cost, repeatable method that has the potential to induce fear extinction, and that has no known side effects. While several studies have reported the efficacy of mindfulness meditation and related mind-body exercises to reduce self-reported PTSD symptoms, little is known about the physiologic changes associated with mindfulness interventions. The present study seeks to evaluate the effects of a mind-body mindfulness intervention (tai chi) on subjective reports of PTSD symptoms, as well as physiologic correlates of PTSD in a population of law enforcement officers. Tai chi was chosen because its focus on awareness of physical movements is expected to provide an easier mindfulness target, as compared to traditional seated meditation. It is well documented that patients with PTSD, who frequently struggle with intrusive trauma-related memories, are often unable to attend to current circumstances, a problem that leads to exacerbation of symptoms. While there are promising preliminary data suggesting that tai chi leads to improvements in self-reported symptoms of PTSD, there are no data regarding the effects of tai chi on objective endocrine, physiological, and behavioral measures of PTSD. The investigators hypothesize that the use of the mind-body practice of tai chi will lead to reductions in subjective self-report measures of PTSD as well a normalization of objective physiological correlates of PTSD. In particular, it is hypothesized that the efficacy of tai chi in the treatment of PTSD is hypothesized to be achieved by facilitating fear extinction and augmenting stress resilience through improved integration of mindfulness practices with daily physical activities. To test this hypothesis, the investigators propose the following specific aims: • Specific Aim 1: To determine the self-reported symptom changes, behavioral changes, and physiological effects that take place during an 8-week intervention of simplified Tai Chi Moving Mindfulness Meditation and Resilience Training (TCMMMRT) in a population of police officers with and without self-reported PTSD. Results from these two groups will also be compared to a control group engaging in aerobic exercise. * Self-reported outcome measures: Brief Pain Inventory (BPI) short form, Beck Depression Inventory (BDI), Pittsburgh Sleep Quality Index (PSQI), PTSD Checklist for Diagnostic and Statistical Manual of Mental Disorders (DSM-V) (PCL-5), and Canadian Occupational Performance Measure (COPM). * Physiological outcome measures: Mobile Acoustic startle Reflex-monitoring System (MARS) measures, heart rate variability (HRV), cortisol measurements, and actigraphy to monitor sleep patterns and activity levels.