Effect of a 24-Month Physical Activity Intervention vs Health Education on Cognitive Outcomes in Sedentary Older Adults: The LIFE Randomized Trial | Dementia and Cognitive Impairment | JAMA | JAMA Network
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Original Investigation
August 25, 2015

Effect of a 24-Month Physical Activity Intervention vs Health Education on Cognitive Outcomes in Sedentary Older Adults: The LIFE Randomized Trial

Author Affiliations
  • 1Section on Gerontology and Geriatric Medicine, Department of Internal Medicine, Wake Forest University School of Medicine, Winston-Salem, North Carolina
  • 2Department of Biostatistical Sciences, Wake Forest University School of Medicine, Winston-Salem, North Carolina
  • 3Stanford Prevention Research Center, Stanford University School of Medicine, Palo Alto, California
  • 4Pennington Biomedical Research Center, Baton Rouge, Louisiana
  • 5College of Medicine, University of Florida, Gainesville
  • 6Leon H. Charney Division of Cardiology, Department of Medicine, New York University School of Medicine, New York, New York
  • 7Division of Gerontology, Department of Epidemiology and Public Health, University of Maryland School of Medicine, Baltimore
  • 8Department of Psychiatry and Center for Aging Research, Indiana University, Indianapolis
  • 9Department of Psychology, Wake Forest University, Winston-Salem, North Carolina
  • 10Department of Health and Exercise Sciences, Wake Forest University, Winston-Salem, North Carolina
  • 11Departments of Neurology and Psychiatry, University of Pittsburgh, Pittsburgh, Pennsylvania
  • 12Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois
  • 13Senior Editor, JAMA
  • 14Nutrition, Exercise Physiology and Sarcopenia Laboratory, Jean Mayer USDA Human Nutrition Research Center on Aging, Tufts University, Boston, Massachusetts
  • 15Departments of Neurology and Medicine, Albert Einstein College of Medicine, Bronx, New York
  • 16Department of Psychiatry, Wake Forest University School of Medicine, Winston-Salem, North Carolina
JAMA. 2015;314(8):781-790. doi:10.1001/jama.2015.9617
Abstract

Importance  Epidemiological evidence suggests that physical activity benefits cognition, but results from randomized trials are limited and mixed.

Objective  To determine whether a 24-month physical activity program results in better cognitive function, lower risk of mild cognitive impairment (MCI) or dementia, or both, compared with a health education program.

Design, Setting, and Participants  A randomized clinical trial, the Lifestyle Interventions and Independence for Elders (LIFE) study, enrolled 1635 community-living participants at 8 US centers from February 2010 until December 2011. Participants were sedentary adults aged 70 to 89 years who were at risk for mobility disability but able to walk 400 m.

Interventions  A structured, moderate-intensity physical activity program (n = 818) that included walking, resistance training, and flexibility exercises or a health education program (n = 817) of educational workshops and upper-extremity stretching.

Main Outcomes and Measures  Prespecified secondary outcomes of the LIFE study included cognitive function measured by the Digit Symbol Coding (DSC) task subtest of the Wechsler Adult Intelligence Scale (score range: 0-133; higher scores indicate better function) and the revised Hopkins Verbal Learning Test (HVLT-R; 12-item word list recall task) assessed in 1476 participants (90.3%). Tertiary outcomes included global and executive cognitive function and incident MCI or dementia at 24 months.

Results  At 24 months, DSC task and HVLT-R scores (adjusted for clinic site, sex, and baseline values) were not different between groups. The mean DSC task scores were 46.26 points for the physical activity group vs 46.28 for the health education group (mean difference, −0.01 points [95% CI, −0.80 to 0.77 points], P = .97). The mean HVLT-R delayed recall scores were 7.22 for the physical activity group vs 7.25 for the health education group (mean difference, −0.03 words [95% CI, −0.29 to 0.24 words], P = .84). No differences for any other cognitive or composite measures were observed. Participants in the physical activity group who were 80 years or older (n = 307) and those with poorer baseline physical performance (n = 328) had better changes in executive function composite scores compared with the health education group (P = .01 for interaction for both comparisons). Incident MCI or dementia occurred in 98 participants (13.2%) in the physical activity group and 91 participants (12.1%) in the health education group (odds ratio, 1.08 [95% CI, 0.80 to 1.46]).

Conclusions and Relevance  Among sedentary older adults, a 24-month moderate-intensity physical activity program compared with a health education program did not result in improvements in global or domain-specific cognitive function.

Trial Registration  clinicaltrials.gov Identifier: NCT01072500

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