F.I.R.E.- Fighters With Focus, Intention, Regulation and Engagement: Development and Feasibility Study of a Psychological Intervention Aiming to Promote Firefighters' Well-being and Mental Health

The FIRE is an innovative mindfulness, Acceptance and Commitment Therapy, and compassion-based manualised intervention, encompassing 8-weekly group sessions delivered at Fire Stations. The FIRE implementation will occur outside the Charlie phase (fire critical season, from May to October), controlling for the potential seasonality impact on results. Two clinical psychologists with mindfulness, ACT, and compassion training will facilitate the FIRE sessions. Weekly gentle reminders will be sent to motivate participants to practice the between-sessions exercises.

The current project aims to conduct a feasibility study, including the dimensions of adaptation, acceptability, implementation, practicality, integration, and limited efficacy. Regarding limited efficacy, it is hypothesised that participants in the experimental group (EG-FIRE) will reveal significant decreases in firefighters' psychopathological symptoms (depression, anxiety, PTSD) and will present higher levels of well-being, feelings of belonging, acceptance, and feelings of warmth from colleagues, and attention when compared to participants in the waiting-list control group (CG-WL). It is also hypothesised that these improvements will persist over a 3-month follow-up period.

The ANEPC will invite Fire Stations in the centre region of Portugal to participate. The FIRE will be presented at each Fire Station enrolled in the study during an informative session, and a leaflet will also be distributed. Interested firefighters will be asked to register, assess eligibility, and give informed consent. Consenting participants will be randomly allocated to: a) experimental group-EG-FIRE receiving the intervention; b) wait-list control group-WL-CG.

All ethical requirements for research with humans will be guaranteed. Participants will complete online standardised self-report measures at pre-intervention (M0), post-intervention (M1), and 3-month follow-up (M2). At M1, the EG-FIRE will complete a feasibility criteria questionnaire. Limited efficacy will be assessed using Intention-to-Treat and per-protocol analyses. Two-way mixed ANOVAs and MANOVAs will be computed on the study outcomes, with Group (EG-FIRE, WL-CG) as the between-subject variable and Time (M0, M1) as the within-subject factor. Repeated ANOVAs and MANOVAS with Time (M1, M2) as the within-subject factor will be computed to investigate changes in outcomes from M1 to M2 and at the 3-month follow-up in the EG-FIRE. Effect sizes will be analysed.

To limit attrition rates, risks, and barriers to the FIRE implementation (interference with firefighters' assignments), it will be proposed that sessions be scheduled to avoid conflicts with participants' work shifts, held at the Fire Station (to avoid participants' burden). It will be negotiated to include the FIRE sessions in the national training hours plan for EG-FIRE participants. To ensure the program's rigorous implementation, weekly meetings will be held with the project supervisors.