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      Effect of Physical Exercise on Cognitive Performance in Older Adults with Mild Cognitive Impairment or Dementia: A Systematic Review

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          Abstract

          Numerous studies have shown that physical exercise has positive effects on cognition in healthy adults. Less is known about the effectiveness of exercise interventions in older individuals already suffering from mild cognitive impairment (MCI) or dementia. The aim of this study was to systematically review the evidence from randomized controlled trials (RCTs) of the effects of physical exercise on cognition in older subjects with MCI or dementia. PubMed, Cochrane and DARE databases were systematically searched for RCTs using terms related to cognition and physical exercise. Altogether, 22 trials were found. The studies on older subjects with MCI reported some positive effects of physical exercise on cognition, mainly on global cognition, executive function, attention and delayed recall. However, most studies performed on older subjects with dementia showed no effect of exercise on cognition. The studies had methodological problems in defining dementia/MCI diagnosis, blinding, inadequate sample sizes and not reporting dropouts, compliance or complications. More studies of good quality on older adults with dementia are needed.

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          Progressive resistance strength training for improving physical function in older adults.

          Chiung-ju Liu, Nancy Latham (2009)
          Muscle weakness in old age is associated with physical function decline. Progressive resistance strength training (PRT) exercises are designed to increase strength. To assess the effects of PRT on older people and identify adverse events. We searched the Cochrane Bone, Joint and Muscle Trauma Group Specialized Register (to March 2007), the Cochrane Central Register of Controlled Trials (The Cochrane Library 2007, Issue 2), MEDLINE (1966 to May 01, 2008), EMBASE (1980 to February 06 2007), CINAHL (1982 to July 01 2007) and two other electronic databases. We also searched reference lists of articles, reviewed conference abstracts and contacted authors. Randomised controlled trials reporting physical outcomes of PRT for older people were included. Two review authors independently selected trials, assessed trial quality and extracted data. Data were pooled where appropriate. One hundred and twenty one trials with 6700 participants were included. In most trials, PRT was performed two to three times per week and at a high intensity. PRT resulted in a small but significant improvement in physical ability (33 trials, 2172 participants; SMD 0.14, 95% CI 0.05 to 0.22). Functional limitation measures also showed improvements: e.g. there was a modest improvement in gait speed (24 trials, 1179 participants, MD 0.08 m/s, 95% CI 0.04 to 0.12); and a moderate to large effect for getting out of a chair (11 trials, 384 participants, SMD -0.94, 95% CI -1.49 to -0.38). PRT had a large positive effect on muscle strength (73 trials, 3059 participants, SMD 0.84, 95% CI 0.67 to 1.00). Participants with osteoarthritis reported a reduction in pain following PRT(6 trials, 503 participants, SMD -0.30, 95% CI -0.48 to -0.13). There was no evidence from 10 other trials (587 participants) that PRT had an effect on bodily pain. Adverse events were poorly recorded but adverse events related to musculoskeletal complaints, such as joint pain and muscle soreness, were reported in many of the studies that prospectively defined and monitored these events. Serious adverse events were rare, and no serious events were reported to be directly related to the exercise programme. This review provides evidence that PRT is an effective intervention for improving physical functioning in older people, including improving strength and the performance of some simple and complex activities. However, some caution is needed with transferring these exercises for use with clinical populations because adverse events are not adequately reported.
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            A Randomized Controlled Trial of Multicomponent Exercise in Older Adults with Mild Cognitive Impairment

            Takao Suzuki, Hiroyuki Shimada, Hyuma Makizako … (2013)
            Background To examine the effect of multicomponent exercise program on memory function in older adults with mild cognitive impairment (MCI), and identify biomarkers associated with improvement of cognitive functions. Methodology/Principal Findings Subjects were 100 older adults (mean age, 75 years) with MCI. The subjects were classified to an amnestic MCI group (n = 50) with neuroimaging measures, and other MCI group (n = 50) before the randomization. Subjects in each group were randomized to either a multicomponent exercise or an education control group using a ratio of 1∶1. The exercise group exercised for 90 min/d, 2 d/wk, 40 times for 6 months. The exercise program was conducted under multitask conditions to stimulate attention and memory. The control group attended two education classes. A repeated-measures ANOVA revealed that no group × time interactions on the cognitive tests and brain atrophy in MCI patients. A sub-analysis of amnestic MCI patients for group × time interactions revealed that the exercise group exhibited significantly better Mini-Mental State Examination (p = .04) and logical memory scores (p = .04), and reducing whole brain cortical atrophy (p<.05) compared to the control group. Low total cholesterol levels before the intervention were associated with an improvement of logical memory scores (p<.05), and a higher level of brain-derived neurotrophic factor was significantly related to improved ADAS-cog scores (p<.05). Conclusions/Significance The results suggested that an exercise intervention is beneficial for improving logical memory and maintaining general cognitive function and reducing whole brain cortical atrophy in older adults with amnestic MCI. Low total cholesterol and higher brain-derived neurotrophic factor may predict improvement of cognitive functions in older adults with MCI. Further studies are required to determine the positive effects of exercise on cognitive function in older adults with MCI. Trial Registration UMIN-CTR UMIN000003662 ctr.cgi?function = brows&action = brows&type = summary&recptno = R000004436&language = J.
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              Six-month walking program changes cognitive and ADL performance in patients with Alzheimer.

              Federico Schena, Renato Scarsini, Massimo Venturelli (2011)
              Motor inactivity is typical in the later stages of Alzheimer's disease although there is evidence that physical exercise can reduce depression and enhance performance of daily activities. The aim of this study was to determine whether a walking program could reduce the functional and cognitive decline of elderly nursing home residents in the later stages of Alzheimer's disease. A total of 21 patients (84 ± 5 years) were randomly assigned to a walking program (WG) or to a control group (CG). A 6-minute walking test (6WT), the Barthel index of activities of daily living (ADLs), and Mini-Mental State Examination (MMSE) tests were performed before and after 24 weeks of the program. The WG showed significant improvement in the 6WT (20%) and ADLs (23%), while the CG decreased in MMSE (-47%), the WG had a slower decline (-13%). This study indicates that it is possible to stabilize the progressive cognitive dysfunctions in nursing home residents with Alzheimer's disease through a specific walking program.
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                Author and article information

                Journal
                Journal ID (publisher-id): DEM
                Journal ID (nlm-ta): Dement Geriatr Cogn Disord
                Journal ID (doi): 10.1159/issn.1420-8008
                Title: Dementia and Geriatric Cognitive Disorders
                Publisher: S. Karger AG
                ISSN (Print): 1420-8008
                ISSN (Electronic): 1421-9824
                Publication date Subscription-year: 2014
                Publication date (Print): October 2014
                Publication date (Electronic): 21 August 2014
                Volume: 38
                Issue: 5-6
                Pages: 347-365
                Affiliations
                aRehabilitation and Care Services, City of Helsinki Hospital, bDepartment of General Practice, University of Helsinki, cDepartment of General Internal Medicine and Geriatrics, and dUnit of Primary Health Care, Helsinki University Central Hospital, Helsinki, eEspoo City Home Care, Espoo, fInstitute of Health Sciences/Geriatrics, University of Oulu, and gUnit of General Practice, Oulu University Hospital, Oulu, Finland
                Author notes
                *Hanna Öhman, Rehabilitation and Care Services, City of Helsinki Hospital, PO Box 0660, FI-00099 Helsinki (Finland), E-Mail hanna.ohman@hel.fi
                Article
                Publisher ID: 365388 Other ID: Dement Geriatr Cogn Disord 2014;38:347-365
                DOI: 10.1159/000365388
                PubMed ID: 25171577
                SO-VID: 890c25fa-2028-4960-9371-ff4ccd10c59c
                Copyright © © 2014 S. Karger AG, Basel
                License:

                Copyright: All rights reserved. No part of this publication may be translated into other languages, reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying, recording, microcopying, or by any information storage and retrieval system, without permission in writing from the publisher. Drug Dosage: The authors and the publisher have exerted every effort to ensure that drug selection and dosage set forth in this text are in accord with current recommendations and practice at the time of publication. However, in view of ongoing research, changes in government regulations, and the constant flow of information relating to drug therapy and drug reactions, the reader is urged to check the package insert for each drug for any changes in indications and dosage and for added warnings and precautions. This is particularly important when the recommended agent is a new and/or infrequently employed drug. Disclaimer: The statements, opinions and data contained in this publication are solely those of the individual authors and contributors and not of the publishers and the editor(s). The appearance of advertisements or/and product references in the publication is not a warranty, endorsement, or approval of the products or services advertised or of their effectiveness, quality or safety. The publisher and the editor(s) disclaim responsibility for any injury to persons or property resulting from any ideas, methods, instructions or products referred to in the content or advertisements.

                History
                Date accepted : 19 June 2014
                Page count
                Figures: 1, Tables: 3, Pages: 19
                Categories
                Subject: Review Article

                ScienceOpen disciplines: Geriatric medicine,Neurology,Cardiovascular Medicine,Neurosciences,Clinical Psychology & Psychiatry,Public health
                Keywords: Cognition,Dementia,Systematic review,Exercise,Mild cognitive impairment
                Data availability:
                ScienceOpen disciplines: Geriatric medicine, Neurology, Cardiovascular Medicine, Neurosciences, Clinical Psychology & Psychiatry, Public health
                Keywords: Cognition, Dementia, Systematic review, Exercise, Mild cognitive impairment

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