A Systematic Review of Community-Based Exercise Interventions for Adults with Intellectual Disabilities

Background: Adults with intellectual disabilities are a particularly inactive sub-population who experience disproportionally poorer health and social exclusion when compared with the wider general population. This systematic review aimed to identify whether community-based exercise interventions were theoretically underpinned, whether they had an active single- or multi-exercise component, and how the interventions were objectively and/or subjectively measured, as well as deducing if they improved the health of this population. Method: A systematic search of five databases was conducted up to May 2024. The study was registered in PROSPERO and followed PRISMA reporting guidelines. Study methodological quality was appraised using the Critical Appraisal Skills Programme. Risk of bias was determined using the Cochrane collaboration tools ROB 2 and ROB 2 CRT. Articles were eligible for inclusion if they recruited adults with intellectual disability, were community-based, had an active exercise component and measured physical activity (PA) levels as an outcome measure. Results: In total, 9034 records were identified, with five studies meeting the eligibility criteria. All studies used a feasibility RCT or RCT methodology and all focused on weight loss or PA levels as the primary outcome measure. Two studies focused on walking as a single exercise, two combined walking with nutrition/weight loss, and one combined walking with aerobics. One multi-component walking and aerobics intervention led to statistically significant improvements in PA. Multi-component community-based exercise interventions led to statistically significant improvements in body composition measures. No studies showed statistically significant improvements in quality of life. Risk of bias was rated moderate to high across all included studies. Conclusions: Caution should be taken in drawing firm conclusions due to the small number of included studies, small sample sizes and high risk of bias. Multi-component community-based interventions are more effective at improving PA levels in adults with intellectual disabilities than walking-only studies. Future studies should be theoretically underpinned and explore the use of peer and student models of social support. The use of fitness facilities such as leisure centres and gyms requires further exploration in this population.