A pilot observational study in Ohio, USA of the Healing of Our Veterans Equine Services Intensive Intervention for Veterans with trauma histories

Abstract: Background/Objectives: Equine-assisted services are being increasingly utilized as complementary interventions for military veterans who have experienced trauma. However, rigorous research is lacking, and randomized controlled trials are needed. The H.O.O.V.E.S. Intensive intervention was developed for this population. This intensive program is an equine-assisted learning approach developed for veteran and active-duty military trauma survivors. The program integrates equine-assisted learning, peer mentorship and experiential learning in a residential retreat format. The primary aim of this pilot study was to determine if more rigorous studies of this intervention are warranted. Secondary aims were to assess preliminary outcomes and explore possible relationships between changes in outcome measures. Methods: This was a pilot prospective study. Inclusion criteria for the program included veteran or active-duty military status and a history of trauma exposure. Data were collected from April–October of 2024 in Ohio, USA. Six psychological instruments were administered to participants before, immediately after and 90 days and 120 days after the intervention. These were the PTSD Checklist for DSM-5 (PCL-5), the Acceptance and Action Questionnaire II (AAQII), the Positive and Negative Affect Scale (PANAS), the State-Trait Anxiety Inventory (STAI), the Beck Depression Inventory (BDI) and the Posttraumatic Growth Inventory (PTGI). Analyses were conducted to assess for significant changes across the study timeframe and for relationships among the changes in psychological instrument scores. Results: Study participants were 32 veterans with trauma histories ranging in age from 30 to 67 years old. There were statistically significant pre- to post-intervention improvements for all instruments except the PTGI, suggesting short-term increased psychological flexibility (AAQII) and positive affect (PANAS-positive) as well as decreased anxiety (STAI), negative affect (PANAS-negative), depression (BDI) and PTSD symptoms (PCL-5). Changes in BDI and PCL-5 scores persisted at 120 days post-intervention whereas changes in the AAQII, PANAS and STAI did not persist. Increased psychological flexibility was correlated with reductions in negative affect, PTSD symptoms and anxiety, as well as with increases in positive affect. Conclusions: Preliminary results reported herein suggest participation is associated with psychological benefits. Further, decreased experiential avoidance/increased psychological flexibility should be explored as an underlying mechanism potentially contributing to the benefits of participation in EAS. A randomized controlled trial of the H.O.O.V.E.S. Intensive program is warranted.