'I can do this': a qualitative exploration of acceptability and experiences of a physical activity behaviour change intervention in people with multiple sclerosis in the UK

OBJECTIVES: The purpose of this study was to explore the experiences of people with multiple sclerosis (MS) who participated in iStep‐MS, a feasibility randomised controlled trial of a behaviour change intervention that aimed to increase physical activity and reduce sedentary behaviour. DESIGN: A qualitative approach was undertaken embedded in the feasibility randomised controlled trial. One‐to‐one semi‐structured interviews were conducted and analysed using Framework analysis. SETTING: Participants were recruited from a single MS therapy centre in the southeast of England, UK. PARTICIPANTS: Sixty people with MS were randomly allocated in a 1:1 ratio to the intervention or usual care. Following a purposive sampling strategy, 15 participants from the intervention arm undertook 1:1 semi‐structured interviews. INTERVENTIONS: The iStep‐MS intervention consisted of four therapist‐led sessions over 12 weeks, supported by a handbook and pedometer. RESULTS: Three themes were identified from the data. "I can do this": developing competence in physical activity highlights the enhanced physical activity confidence gained through goal setting and accomplishment. "I felt valued": the nurturing culture provides an overview of the supportive and non‐judgemental environment created by the programme structure and therapeutic relationship. Finally, "What can I do?": empowered enactment describes the transition from the supported iStep‐MS intervention to intrinsically motivated physical activity enactment. CONCLUSIONS: Overall, this study supports the acceptability of the iStep‐MS intervention and identified key areas that supported participants to be physically active. TRIAL REGISTRATION NUMBER: ISRCTN15343862.