MentalGym™ and NeuroBrave™ Guided Wearable-Assisted Physiology Regulation Training for PTSD (PRTP)

This randomized controlled trial (RCT) will evaluate the effectiveness of a digital biofeedback-based intervention ("Mental Gym®") designed to reduce Posttraumatic Stress Disorder (PTSD) symptoms and improve mental health. The intervention combines daily HRV biofeedback exercises using a wearable device (Garmin watch), a dedicated mobile application, and weekly group guidance sessions. A delayed-intervention control group design will be used. To account for expected attrition and ensure a final sample of 60 participants, approximately 80 subjects will be recruited. Physiological and self-report data will be collected pre- and post-intervention, weekly during the intervention, and at follow-ups (3 months post-intervention). The study population consists of combat veterans diagnosed with PTSD.

Inclusion Criteria: * Sex: Male. * Age: 18 to 50 Years. * Diagnosis: Clinical diagnosis of Posttraumatic Stress Disorder (PTSD) with mild to moderate-severe symptom intensity. * Symptom Severity: A PCL-5 total score of up to 60 at screening. * Traumatic Event: PTSD diagnosis based on a traumatic event that occurred in the year 2000 or later. * Service Eligibility: Eligibility for Ministry of Defense (MOD) rehabilitation services. * Technical Proficiency: Ability to use a smartphone and a wearable device. Exclusion Criteria: * High Symptom Severity: PTSD symptom severity exceeding the moderate-severe range (PCL-5 score \> 60) or requiring more intensive clinical intervention. * Psychiatric Stability: Acute psychiatric instability, including active suicidal ideation or psychosis. * Medication: Current use of Olanzapine (Zyprexa) or Quetiapine (Seroquel). * Sleep Disturbances: Severe sleep impairment (score \> 7 on the The Insomnia Severity Index). * Functional Impairment: Severe impairment in concentration or cognitive processing that precludes the use of digital biofeedback tools.