Abstract: Objective: To conduct a scoping review of studies on the application of Ecological Momentary Intervention (EMI) in the physical activity of elderly patients with chronic diseases, providing reference for optimizing the application of EMI in the management of chronic diseases in the elderly. Methods: Using scoping review methodological framework, relevant literature was retrieved from domestic and international databases, with the search period from database inception to February 28, 2025. Results: A total of 20 articles were included. EMI interventions were predominantly delivered via applications and wearable devices, categorized mainly as simple and interactive EMIs. Momentary assessments focused on behavioral data and contextual variables. Trigger rules included user-initiated, fixed-time, random-time, and decision-rule triggers. Intervention content comprised static and dynamic components, presented through visual feedback, haptic feedback, and motivational messages. Intervention outcomes covered both short and long-term effects. EMI has been widely applied in cancer, diabetes, and coronary heart disease patients, with initial evidence of feasibility and acceptability. Physical activity increased by 29-220 minutes/week, steps increased by 297.7-1920 steps/day, and sedentary time decreased by 21-262.2 minutes/day. Intervention engagement ranged from 33% to 100%. Conclusion: EMI is feasible and effective in enhancing physical activity in elderly patients with chronic diseases, but intervention engagement needs improvement.

Key words: elderly; chronic disease; Ecological Momentary Intervention; physical activity; scoping review