OBJECTIVES: This study aimed to examine the effectiveness of a multicomponent intervention combining physical, cognitive, and social activities developed to promote community activity in improving cognitive function in older adults with mild cognitive impairment (MCI). DESIGN: Single-blind randomized controlled trial. SETTING: A total of 83 Japanese older adults with MCI participated in the study from April to September 2017. INTERVENTIONS: Participants were randomly assigned to either the multicomponent intervention group (n = 41), attending 90-minute physical, cognitive, or social activity sessions using community resources twice weekly, or the health education control group (n = 42). OUTCOMES: The primary outcomes were cognitive functions, and the secondary outcomes were grip strength, walking speed, depressive symptoms, physical activities, number of outdoor activities, and conversation time. RESULTS: Analysis using linear mixed models revealed significantly greater improvements in the intervention group in spatial working memory (p = 0.024) following intervention compared with the control group. Time spent in moderate-to-vigorous physical activity (p = 0.048) and step count (p = 0.059) decreased from the baseline post-intervention in the control group, whereas the baseline was maintained in the intervention group. No significant between-group differences were found post-intervention in the other primary and secondary outcomes. CONCLUSIONS: This study showed that a 24-week multicomponent intervention program was effective in improving spatial working memory and maintaining physical activity in older adults with MCI. A follow-up investigation is required to determine whether continuation of physical, cognitive, and social activity can prevent dementia or reverse MCI in older adults.

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