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Meta-Analysis
. 2019 Jul 2;19(1):181.
doi: 10.1186/s12877-019-1175-2.

Effects of physical activity and exercise on the cognitive function of patients with Alzheimer disease: a meta-analysis

Rui-Xia Jia  1 , Jing-Hong Liang  1 , Yong Xu  2 , Ying-Quan Wang  1
Affiliations
Meta-Analysis

Effects of physical activity and exercise on the cognitive function of patients with Alzheimer disease: a meta-analysis

Rui-Xia Jia et al. BMC Geriatr. .

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: Alzheimer’s disease, cognition; Elderly; Exercise; Meta-analysis; Older adults; Physical activity.

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Conflict of interest statement

The authors declare that they have no competing interests.

Figures

Fig. 1
Fig. 1
Literature review flowchart. (AD, Alzheimer’s disease; MMSE, Mini-Mental State Examination; RCT, Randomized controlled trial)
Fig. 2
Fig. 2
Assessment for risk of bias
Fig. 3
Fig. 3
Assessment for the risk of bias in included studies
Fig. 4
Fig. 4
Effects of physical activity and exercise on the outcome of cognitive function of patients with AD (13 studies)
Fig. 5
Fig. 5
Effects of physical activity and exercise on the outcome of cognitive function of patients with AD (7 studies)
Fig. 6
Fig. 6
Subgroup analysis on the outcome of cognitive function categorized by country (Group 1 interventions in countries other than China; Group 2 interventions in China)
Fig. 7
Fig. 7
Subgroup analysis on the outcome of cognitive function categorized by minutes of intervention per session (Group 1 up to 30 min per session; Group 2 more than 30 min per session)
Fig. 8
Fig. 8
Subgroup analysis on the outcome of cognitive function categorized by hours of intervention per week (Group 1 up to two hours per week; Group 2 more than 2 h per week)
Fig. 9
Fig. 9
Subgroup analysis on the outcome of cognitive function categorized by frequency of intervention per week (Group 1 up to three times per week; Group 2 more than 3 times per week)
Fig. 10
Fig. 10
Subgroup analysis on the outcome of cognitive function categorized by length of whole intervention duration (Group 1 duration up to 16 weeks; Group 2 duration more than 16 weeks)
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