Effects of physical activity and exercise on the cognitive function of patients with Alzheimer disease: a meta-analysis
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RESEARCH ARTICLE
Open Access
Effects of physical activity and exercise on the cognitive function of patients with Alzheimer disease: a meta-analysis Rui-xia Jia†, Jing-hong Liang†, Yong Xu* and Ying-quan Wang
Abstract Background: Alzheimer’s disease (AD), as the most common cause of dementia, brings huge economic burden for patients and social health care systems, which motivates researchers to study multiple protective factors, among which physical activity and exercise have been proven to be both effective and economically feasible. Methods: A systematic literature search was performed for eligible studies published up to November 1st 2018 on three international databases (PubMed, Cochrane Library, and Embase) and two Chinese databases (Wanfang Data, China National Knowledge Infrastructure). All analyses were conducted using Stata 14.0. Due to heterogeneity between studies, a random-effects model was used for this meta-analysis. Meta-analysis was used to explore if physical activity and exercise can exert positive effects on cognition of elderly with AD and subgroup analyses were conducted to find out if there are dose-response effects. Results: A total of 13 randomized controlled trials were included with a sample size of 673 subjects diagnosed with AD. Intervention groups showed a statistically significant improvement in cognition of included subjects measured by the MMSE score (SMD = 1.12 CI:0.66~1.59) compared to the control groups. Subgroup analyses showed different amounts of physical activity and exercise can generate different effects. Conclusions: As one of few meta-analyses comparing different quantities of physical activity and exercise interventions for AD in details, our study suggests that physical activity and exercise can improve cognition of older adults with AD. While the concomitant effects on cognition functions of high frequency interventions was not greater than that of low frequency interventions, the threshold remains to be settled. However, more RCTs with rigorous study design are needed to support our findings. Keywords: Physical activity, Exercise, Alzheimer’s disease, cognition, Meta-analysis, Elderly, Older adults
Background According to World Alzheimer Report 2016, about 47 million people struggled with dementia worldwide. This number was predicted to increase to more than 131 million by 2050, as the size and proportion of population age 65 and older continue to escalate across the world. There is also huge health care cost caused by dementia. The total estimated cost of dementia was US$818 billion * Correspondence: [email protected] † Ruixia Jia and Jinghong Liang contributed equally to the work presented here and therefore should be considered equivalent authors. Department of Social Medicine, Jiangsu Key Laboratory of Preventive and Translational Medicine for Geriatric Diseases, School of Public Health, Medical College of Soochow University, No.199 Ren Ai Road, Suzhou, People’s Republic of China215123
worldwide, which is set to rise as the number of people with dementia increa
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