Physical activity interventions for inpatients in secure mental health settings: what works, for whom, in what circumstances and why? A protocol for a realist synthesis.

Introduction: The physical health of individuals with severe mental illness (SMI) is a cause for concern. While the purpose of inpatient mental health settings is rehabilitation and treatment, the physical health of hospitalised patients commonly deteriorates. Physical activity (PA) has been identified as an appropriate intervention to help improve the psychological and physical health of inpatients.