Objectives To identify and compare barriers and enablers influencing physical activity (PA) in adults and children with type 1 diabetes (T1D) in the UK, and to map these factors to behavioural theory to inform intervention development.

Methods A cross-sectional, national online survey was distributed via Breakthrough T1D (formerly JDRF) networks between December 2022 and January 2023. The survey included closed and open-ended questions on PA behaviours and influencing factors. Responses were collected from adults with T1D and parents of children with T1D. Quantitative data were analysed using descriptive statistics and two-proportion z-tests. Free-text responses were analysed thematically. Barriers and enablers were synthesised using the COM-B model and socioecological framework to identify behavioural determinants and intervention targets.

Results 311 responses were analysed (182 adults, 129 parent proxies for children). Stigma and negative comments were reported by nearly three quarters of both groups. Adults were more likely to cite clinical and motivational barriers, notably fear of hypoglycaemia (53%) and lack of motivation (39%). Children more frequently reported external barriers such as lack of education among coaches and organisers (31%). Motivators differed by age, with adults prioritising health and diabetes management, and children emphasising enjoyment and social aspects. Mapping to COM-B and TDF highlighted the need for interventions addressing both personal and environmental factors.

Conclusion Findings highlight the need for multi-level interventions to address stigma and stereotyping. Educational initiatives and policy measures are essential to improve understanding of T1D, ensure reasonable adjustments, and promote equity and inclusion across settings.

What is already known?

People with type 1 diabetes (T1D) face unique barriers to physical activity, including fear of hypoglycaemia and the complexity of diabetes management.

Most existing studies focus on either adults or children and overlook social and environmental factors.

What this study adds?

This is the first UK-wide study to compare barriers and enablers to physical activity in adults and children with T1D.

This survey identifies distinct age-related challenges and highlights stigma and lack of support in sport settings as major, under-recognised barriers.

How this study might affect research, practice or policy

Findings support the need for multi-level interventions and policy reform to address stigma and improve diabetes education among coaches, teachers, and healthcare professionals.

The authors have declared no competing interest.

This research received no external funding.

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Only existing datasets were used and no new data collected for the purpose of this study

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This study involved secondary analysis of an existing dataset. Data available from third party upon reasonable request.