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January 15, 2019; 92 (3) Article

Lifestyle and neurocognition in older adults with cognitive impairments

A randomized trial

James A. Blumenthal, Patrick J. Smith, Stephanie Mabe, Alan Hinderliter, Pao-Hwa Lin, Lawrence Liao, Kathleen A. Welsh-Bohmer, Jeffrey N. Browndyke, William E. Kraus, P. Murali Doraiswamy, James R. Burke, Andrew Sherwood
First published December 19, 2018, DOI: https://doi.org/10.1212/WNL.0000000000006784
James A. Blumenthal
From the Departments of Psychiatry and Behavioral Sciences (J.A.B., P.J.S., S.M., K.A.W.-B., J.N.B., P.M.D., A.S.), Medicine (P.-H.L., L.L., W.E.K., P.M.D.), and Neurology (K.A.W.-B., J.R.B.), Duke University Medical Center, Durham; and Department of Medicine (A.H.), University of North Carolina at Chapel Hill.
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Patrick J. Smith
From the Departments of Psychiatry and Behavioral Sciences (J.A.B., P.J.S., S.M., K.A.W.-B., J.N.B., P.M.D., A.S.), Medicine (P.-H.L., L.L., W.E.K., P.M.D.), and Neurology (K.A.W.-B., J.R.B.), Duke University Medical Center, Durham; and Department of Medicine (A.H.), University of North Carolina at Chapel Hill.
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Stephanie Mabe
From the Departments of Psychiatry and Behavioral Sciences (J.A.B., P.J.S., S.M., K.A.W.-B., J.N.B., P.M.D., A.S.), Medicine (P.-H.L., L.L., W.E.K., P.M.D.), and Neurology (K.A.W.-B., J.R.B.), Duke University Medical Center, Durham; and Department of Medicine (A.H.), University of North Carolina at Chapel Hill.
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Alan Hinderliter
From the Departments of Psychiatry and Behavioral Sciences (J.A.B., P.J.S., S.M., K.A.W.-B., J.N.B., P.M.D., A.S.), Medicine (P.-H.L., L.L., W.E.K., P.M.D.), and Neurology (K.A.W.-B., J.R.B.), Duke University Medical Center, Durham; and Department of Medicine (A.H.), University of North Carolina at Chapel Hill.
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Pao-Hwa Lin
From the Departments of Psychiatry and Behavioral Sciences (J.A.B., P.J.S., S.M., K.A.W.-B., J.N.B., P.M.D., A.S.), Medicine (P.-H.L., L.L., W.E.K., P.M.D.), and Neurology (K.A.W.-B., J.R.B.), Duke University Medical Center, Durham; and Department of Medicine (A.H.), University of North Carolina at Chapel Hill.
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Lawrence Liao
From the Departments of Psychiatry and Behavioral Sciences (J.A.B., P.J.S., S.M., K.A.W.-B., J.N.B., P.M.D., A.S.), Medicine (P.-H.L., L.L., W.E.K., P.M.D.), and Neurology (K.A.W.-B., J.R.B.), Duke University Medical Center, Durham; and Department of Medicine (A.H.), University of North Carolina at Chapel Hill.
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Kathleen A. Welsh-Bohmer
From the Departments of Psychiatry and Behavioral Sciences (J.A.B., P.J.S., S.M., K.A.W.-B., J.N.B., P.M.D., A.S.), Medicine (P.-H.L., L.L., W.E.K., P.M.D.), and Neurology (K.A.W.-B., J.R.B.), Duke University Medical Center, Durham; and Department of Medicine (A.H.), University of North Carolina at Chapel Hill.
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Jeffrey N. Browndyke
From the Departments of Psychiatry and Behavioral Sciences (J.A.B., P.J.S., S.M., K.A.W.-B., J.N.B., P.M.D., A.S.), Medicine (P.-H.L., L.L., W.E.K., P.M.D.), and Neurology (K.A.W.-B., J.R.B.), Duke University Medical Center, Durham; and Department of Medicine (A.H.), University of North Carolina at Chapel Hill.
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William E. Kraus
From the Departments of Psychiatry and Behavioral Sciences (J.A.B., P.J.S., S.M., K.A.W.-B., J.N.B., P.M.D., A.S.), Medicine (P.-H.L., L.L., W.E.K., P.M.D.), and Neurology (K.A.W.-B., J.R.B.), Duke University Medical Center, Durham; and Department of Medicine (A.H.), University of North Carolina at Chapel Hill.
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P. Murali Doraiswamy
From the Departments of Psychiatry and Behavioral Sciences (J.A.B., P.J.S., S.M., K.A.W.-B., J.N.B., P.M.D., A.S.), Medicine (P.-H.L., L.L., W.E.K., P.M.D.), and Neurology (K.A.W.-B., J.R.B.), Duke University Medical Center, Durham; and Department of Medicine (A.H.), University of North Carolina at Chapel Hill.
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James R. Burke
From the Departments of Psychiatry and Behavioral Sciences (J.A.B., P.J.S., S.M., K.A.W.-B., J.N.B., P.M.D., A.S.), Medicine (P.-H.L., L.L., W.E.K., P.M.D.), and Neurology (K.A.W.-B., J.R.B.), Duke University Medical Center, Durham; and Department of Medicine (A.H.), University of North Carolina at Chapel Hill.
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Andrew Sherwood
From the Departments of Psychiatry and Behavioral Sciences (J.A.B., P.J.S., S.M., K.A.W.-B., J.N.B., P.M.D., A.S.), Medicine (P.-H.L., L.L., W.E.K., P.M.D.), and Neurology (K.A.W.-B., J.R.B.), Duke University Medical Center, Durham; and Department of Medicine (A.H.), University of North Carolina at Chapel Hill.
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Citation
Lifestyle and neurocognition in older adults with cognitive impairments
A randomized trial
James A. Blumenthal, Patrick J. Smith, Stephanie Mabe, Alan Hinderliter, Pao-Hwa Lin, Lawrence Liao, Kathleen A. Welsh-Bohmer, Jeffrey N. Browndyke, William E. Kraus, P. Murali Doraiswamy, James R. Burke, Andrew Sherwood
Neurology Jan 2019, 92 (3) e212-e223; DOI: 10.1212/WNL.0000000000006784

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Abstract

Objective To determine the independent and additive effects of aerobic exercise (AE) and the Dietary Approaches to Stop Hypertension (DASH) diet on executive functioning in adults with cognitive impairments with no dementia (CIND) and risk factors for cardiovascular disease (CVD).

Methods A 2-by-2 factorial (exercise/no exercise and DASH diet/no DASH diet) randomized clinical trial was conducted in 160 sedentary men and women (age >55 years) with CIND and CVD risk factors. Participants were randomly assigned to 6 months of AE, DASH diet nutritional counseling, a combination of both AE and DASH, or health education (HE). The primary endpoint was a prespecified composite measure of executive function; secondary outcomes included measures of language/verbal fluency, memory, and ratings on the modified Clinical Dementia Rating Scale.

Results Participants who engaged in AE (d = 0.32, p = 0.046) but not those who consumed the DASH diet (d = 0.30, p = 0.059) demonstrated significant improvements in the executive function domain. The largest improvements were observed for participants randomized to the combined AE and DASH diet group (d = 0.40, p = 0.012) compared to those receiving HE. Greater aerobic fitness (b = 2.3, p = 0.049), reduced CVD risk (b = 2.6, p = 0.042), and reduced sodium intake (b = 0.18, p = 0.024) were associated with improvements in executive function. There were no significant improvements in the memory or language/verbal fluency domains.

Conclusions These preliminary findings show that AE promotes improved executive functioning in adults at risk for cognitive decline.

ClinicalTrials.gov identifier NCT01573546.

Classification of evidence This study provides Class I evidence that for adults with CIND, AE but not the DASH diet significantly improves executive functioning.

Glossary

AE=
aerobic exercise;
CDR=
Clinical Dementia Rating;
CIND=
cognitive impairment without dementia;
COWA=
Controlled Oral Word Association Test;
CVD=
cardiovascular disease;
DASH=
Dietary Approaches to Stop Hypertension;
DDD=
daily defined dose;
ENLIGHTEN=
Exercise and Nutritional Interventions for Neurocognitive Health Enhancement;
FINGER=
Finnish Geriatric Intervention Study to Prevent Cognitive Impairment and Disability;
FSRP=
Framingham Stroke Risk Profile;
MoCA=
Montreal Cognitive Assessment;
TMT=
Trail Making Test

Footnotes

  • Go to Neurology.org/N for full disclosures. Funding information and disclosures deemed relevant by the authors, if any, are provided at the end of the article.

  • Class of Evidence: NPub.org/coe

  • Received May 19, 2018.
  • Accepted in final form September 18, 2018.
  • © 2018 American Academy of Neurology
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