Evaluation of an Online Cognitive Behavioural Therapy, Mindfulness Meditation, and Yoga (CBT-MY) Intervention for Posttraumatic Stress Disorder: A Single Arm Clinical Trial with Psychometric and Psychophysiological Outcomes

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dc.contributor.advisorRitvo, Paul G.
dc.contributor.authorKirk Chang, Megan Ashley
dc.date.accessioned2021-11-15T15:26:15Z
dc.date.available2021-11-15T15:26:15Z
dc.date.copyright2021-06
dc.date.issued2021-11-15
dc.date.updated2021-11-15T15:26:15Z
dc.degree.disciplineKinesiology & Health Science
dc.degree.levelDoctoral
dc.degree.namePhD - Doctor of Philosophy
dc.description.abstractObjective: The aim of this dissertation was to evaluate an online cognitive behavioural therapy intervention that combined mindfulness and yoga (CBT-MY) in the treatment of posttraumatic stress disorder (PTSD). A secondary objective was to explore objective measures of autonomic function among adults with PTSD. Methodology: This single-arm experimental trial was conducted at York University. A total of 22 adults with PTSD symptoms were recruited to complete an 8-week intervention consisting of weekly CBT-MY material and one hour of virtual, phone-based CBT counselling each week. Psychometric outcomes of PTSD, depression, anxiety, chronic pain, and mindfulness were collected a two time points (baseline, post-intervention). Objective measures of pupillometry and heart rate variability (HRV) were examined during a 25-minute protocol consisting of rest, a stress task, and guided meditation. Psychophysiology outcomes of PTSD participants were compared with cross-sectional data from a convenience cohort of 49 non-PTSD-affected control participants that completed the computer protocol at a single time point and did not receive the intervention. Results. Pre-post analyses revealed large reductions in PTSD symptom severity (d = 1.60), depression (d = 0.83), anxiety (d = 0.99), and increased mindfulness (d = 0.88). Linear mixed effects modelling revealed a significant main effect of time with reductions in peak pupil dilation (PPD) post-intervention (M = -.06, SE = .01, p = .001) but no significant change in pre-post HRV (p = .87). Significantly lower HRV in PTSD subjects was observed compared to non-PTSD participants (F1,65 = 14.54, p = .001, 2 = .10). Conclusion. 8-weeks of online CBT-MY with weekly phone-based counselling shows promise in the reduction of PTSD symptom severity and associated mental health outcomes beyond clinically meaningful ranges. Autonomic function was less clear and supported improved pupillometry response. Findings lend support for future randomized trials investigating integrated online CBT-MY treatment in reducing PTSD symptom severity.
dc.identifier.urihttp://hdl.handle.net/10315/38694
dc.languageen
dc.rightsAuthor owns copyright, except where explicitly noted. Please contact the author directly with licensing requests.
dc.subjectPhysiological psychology
dc.subject.keywordsMental health
dc.subject.keywordsPosttraumatic stress
dc.subject.keywordsTrauma
dc.subject.keywordsPTSD
dc.subject.keywordsYoung adults
dc.subject.keywordsStress
dc.subject.keywordsAnxiety
dc.subject.keywordsDepression
dc.subject.keywordsMindfulness
dc.subject.keywordsMeditation
dc.subject.keywordsYoga
dc.subject.keywordsHealth psychology
dc.subject.keywordsClinical psychology
dc.subject.keywordsTrauma-informed
dc.subject.keywordsHealth coaching
dc.titleEvaluation of an Online Cognitive Behavioural Therapy, Mindfulness Meditation, and Yoga (CBT-MY) Intervention for Posttraumatic Stress Disorder: A Single Arm Clinical Trial with Psychometric and Psychophysiological Outcomes
dc.typeElectronic Thesis or Dissertation

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