Background: People with progressive Multiple Sclerosis often struggle to access appropriate and inclusive support for regular physical activity. The Lifestyle, Exercise and Activity Package (LEAP-MS) intervention, is a co-designed web-based physical activity intervention for people with progressive Multiple Sclerosis (MS). It consists of two key components; (1) web-based physical activity coaching with physiotherapists using self-management support strategies and 2) an interactive web-based platform including a physical activity information suite, an activity selection and planning tool and a participant-physiotherapist messaging system. We aimed to evaluate recruitment, retention and uptake, in a single arm feasibility study.

Methods: Participants with primary or secondary progressive MS with an Expanded Disability Status Scale score of 6 to 8 were recruited. Assessments included the MS Impact Scale (MSIS-29) and measures of participation at baseline, three and six months. All participants received the intervention which consisted of up to six web-based physiotherapy- led physical activity coaching sessions alongside access to web-based education and activity suites. Recruitment, retention and uptake data were summarised. Pre-defined progression criteria were used to guide feasibility assessment. Clinical outcome data were analysed descriptively.

Results: Fifty-eight percent (21/36) of those submitting expressions of interest were recruited; 76% completed follow-up. Pre-specified progression criteria for retention were met but recruitment did not meet progression criteria. The intervention achieved set fidelity criteria. At three months, 12 participants (75%) reported improvements in routine activities after the intervention. MSIS-29 physical scores improved by an average of eight points (95% CI -12.6 to -3.3). Improvements were also seen in MSIS-29 psychological scores and fatigue. Some improvements were maintained at six months.

Conclusions: The LEAP-MS intervention is feasible and associated with improvements in MSIS-29 scores. The intervention facilitated partnership working between physiotherapists and people with progressive MS. Users developed valuable skills in supported self-management by focussing on enhancing physical activity to support overall wellbeing. This work has laid the foundations for a large-scale evaluation of a co-designed intervention with potential for far reaching impact on the lives of people with progressive MS.