Abstract
OBJECTIVES: Our aim was to examine the impacts of baseline fatigue on the effectiveness of a physical activity (PA) intervention to prevent major mobility disability (MMD) and persistent major mobility disability (PMMD) in participants from the Lifestyle Interventions and Independence for Elders (LIFE) study. DESIGN: Prospective cohort of individuals aged 65 years or older undergoing structured PA intervention or health education (HE) for a mean of 2.6 years. SETTING: LIFE was a multicenter eight-site randomized trial that compared the efficacy of a structured PA intervention with an HE program in reducing the incidence of MMD. PARTICIPANTS: Study participants (N = 1591) at baseline were 78.9 ± 5.2 years of age, with low PA and at risk for mobility impairment. MEASUREMENTS: Self-reported fatigue was assessed using the modified trait version of the Exercise-Induced Feelings Inventory, a six-question scale rating energy levels in the past week. Responses ranged from 0 (none of the time) to 5 (all of the time). Total score was calculated by averaging across questions; baseline fatigue was based on the median split: 2 or higher = more fatigue (N = 856) and lower than 2 = less fatigue (N = 735). Participants performed a usual-paced 400-m walk every 6 months. We defined incident MMD as the inability to walk 400-m at follow-up visits; PMMD was defined as two consecutive walk failures. Cox proportional hazard models quantified the risk of MMD and PMMD in PA vs HE stratified by baseline fatigue adjusted for covariates. RESULTS: Among those with higher baseline fatigue, PA participants had a 29% and 40% lower risk of MMD and PMMD, respectively, over the trial compared with HE (hazard ratio [HR] for MMD =.71; 95% confidence interval [CI] =.57-.90; P =.004) and PMMD (HR =.60; 95% CI =.44-.82; P =.001). For those with lower baseline fatigue, no group differences in MMD (P =.36) or PMMD (P =.82) were found. Results of baseline fatigue by intervention interaction was MMD (P =.18) and PMMD (P =.05). CONCLUSION: A long-term moderate intensity PA intervention was particularly effective at preserving mobility in older adults with higher levels of baseline fatigue. J Am Geriatr Soc 68:619–624, 2020.
Original language | English (US) |
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Pages (from-to) | 619-624 |
Number of pages | 6 |
Journal | Journal of the American Geriatrics Society |
Volume | 68 |
Issue number | 3 |
DOIs | |
State | Published - Mar 1 2020 |
Funding
The Lifestyle Interventions and Independence for Elders study was funded by a National Institutes of Health/National Institute on Aging (NIH/NIA) Cooperative Agreement U01 AG022376 and a supplement from the National Heart, Lung, and Blood Institute (NHLBI) 3U01AG022376-05A2S, and it was sponsored in part by the Intramural Research Program, NIA and NIH. Theresa Gmelin is supported by the Epidemiology of Aging Training Grant at the University of Pittsburgh, NIA T32-AG000181. The research is partially supported by the Claude D. Pepper Older Americans Independence Centers at the University of Florida (P30 AG028740), Wake Forest University (P30 AG21332), Tufts University (P30 AG031679), University of Pittsburgh (P30 AG024827), and Yale University (P30 AG021342) and the NIH/NCRR CTSA at Stanford University (UL1 RR025744). The authors have declared no conflicts of interest for this article. Nancy W. Glynn, Laura C. Lovato, and Theresa Gmelin had full access to all of the data in the study and take responsibility for the integrity of the data and accuracy of the data analysis. All the authors interpreted the data and critically revised the manuscript for important intellectual content. All the authors read and approved the submitted manuscript. The NIH, NIA, NHLBI, and the Claude D. Pepper Older Americans Independence Centers had no role in the design or conduct of the study; collection, management, analysis, or interpretation of the data; preparation, review, or approval of the manuscript; or the decision to submit the manuscript for publication. The Lifestyle Interventions and Independence for Elders study was funded by a National Institutes of Health/National Institute on Aging (NIH/NIA) Cooperative Agreement U01 AG022376 and a supplement from the National Heart, Lung, and Blood Institute (NHLBI) 3U01AG022376‐05A2S, and it was sponsored in part by the Intramural Research Program, NIA and NIH. Theresa Gmelin is supported by the Epidemiology of Aging Training Grant at the University of Pittsburgh, NIA T32‐AG000181. The research is partially supported by the Claude D. Pepper Older Americans Independence Centers at the University of Florida (P30 AG028740), Wake Forest University (P30 AG21332), Tufts University (P30 AG031679), University of Pittsburgh (P30 AG024827), and Yale University (P30 AG021342) and the NIH/NCRR CTSA at Stanford University (UL1 RR025744).
Keywords
- exercise
- fatigability
- health education
- older adults
ASJC Scopus subject areas
- Geriatrics and Gerontology