Luiz Fernando Biazus-Sehn1, Felipe Barreto Schuch2, Joseph Firth3, Felipe de Souza Stigger4. 1. Postgraduate Program in Rehabilitation Sciences, Federal University of Health Sciences of Porto Alegre, Porto Alegre, Brazil. Electronic address: luizfbiazus@gmail.com. 2. Department of Sports Methods and Techniques, Federal University of Santa Maria, Santa Maria, Brazil. Electronic address: felipe.schuch@ufsm.br. 3. Division of Psychology and Mental Health, University of Manchester, Manchester, UK. Electronic address: joefirth@gmail.com. 4. Postgraduate Program in Rehabilitation Sciences, Federal University of Health Sciences of Porto Alegre, Porto Alegre, Brazil; Department of Physiotherapy, Federal University of Health Sciences of Porto Alegre, Porto Alegre, Brazil. Electronic address: stigger@ufcspa.edu.br.
Abstract
BACKGROUND AND PURPOSE: Mild Cognitive Impairment (MCI) is associated with a greater risk of dementia for older adults. However, systematic reviews have shown that some physical exercise (PE) seems to improve MCI symptoms and signs. Those reviews and meta-analysis could not explain what possible moderator influenced their results. This meta-analysis aims to identify the effect of PE over older people's cognition with MCI and explore sources of heterogeneity. METHODS: Databases were searched from inception January 2020 for randomized clinical trials that evaluated the effects of PE over cognition of older persons with MCI. Random effect meta-analyses were performed for each cognitive outcome. Subgroup analyses and meta-regressions models explored the potential sources of heterogeneity. RESULTS: A total of 2077 participants (mean age = 71.8 years) from 27 studies were included. PE improves global cognitive function (SMD = 0.348 [95 % CI 0.166 to 0.529]; p = 0.0001), executive function (SMD = 0.213 [95 % CI 0.026 to 0.400]; p = 0.026) and delayed recall (SMD = 0.180 [95 % CI 0.002 to 0.358]; p = 0.047). A trend towards beneficial effects of PE on verbal fluency (SMD = 0.270 [95 %, CI -0.021 to 0.561]; p = 0.069) and attention (SMD = 0.170 [CI -0.016 to 0.357]; p = 0.073) were also observed. Subgroup analyses showed a relationship between modality and intensity of physical exercise and changes observed in global cognitive function, executive function, delayed recall, verbal fluency and working memory. DISCUSSION AND CONCLUSION: PE can ameliorate cognitive deficts of older adults with MCI. The most pronounced effects appear to arise from other types of exercise that included mind-body exercises and moderate intensity.
BACKGROUND AND PURPOSE: Mild Cognitive Impairment (MCI) is associated with a greater risk of dementia for older adults. However, systematic reviews have shown that some physical exercise (PE) seems to improve MCI symptoms and signs. Those reviews and meta-analysis could not explain what possible moderator influenced their results. This meta-analysis aims to identify the effect of PE over older people's cognition with MCI and explore sources of heterogeneity. METHODS: Databases were searched from inception January 2020 for randomized clinical trials that evaluated the effects of PE over cognition of older persons with MCI. Random effect meta-analyses were performed for each cognitive outcome. Subgroup analyses and meta-regressions models explored the potential sources of heterogeneity. RESULTS: A total of 2077 participants (mean age = 71.8 years) from 27 studies were included. PE improves global cognitive function (SMD = 0.348 [95 % CI 0.166 to 0.529]; p = 0.0001), executive function (SMD = 0.213 [95 % CI 0.026 to 0.400]; p = 0.026) and delayed recall (SMD = 0.180 [95 % CI 0.002 to 0.358]; p = 0.047). A trend towards beneficial effects of PE on verbal fluency (SMD = 0.270 [95 %, CI -0.021 to 0.561]; p = 0.069) and attention (SMD = 0.170 [CI -0.016 to 0.357]; p = 0.073) were also observed. Subgroup analyses showed a relationship between modality and intensity of physical exercise and changes observed in global cognitive function, executive function, delayed recall, verbal fluency and working memory. DISCUSSION AND CONCLUSION: PE can ameliorate cognitive deficts of older adults with MCI. The most pronounced effects appear to arise from other types of exercise that included mind-body exercises and moderate intensity.
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