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Predictors of Change in Physical Function in Older Adults in Response to Long-Term, Structured Physical Activity: The LIFE Study

Published:August 24, 2016DOI:https://doi.org/10.1016/j.apmr.2016.07.019

      Abstract

      Objectives

      To evaluate the extent of variability in functional responses in participants in the Lifestyle Interventions and Independence for Elders (LIFE) study and to identify the relative contributions of intervention adherence, physical activity, and demographic and health characteristics to this variability.

      Design

      Secondary analysis.

      Setting

      Multicenter institutions.

      Participants

      A volunteer sample (N=1635) of sedentary men and women aged 70 to 89 years who were able to walk 400m but had physical limitations, defined as a Short Physical Performance Battery (SPPB) score of ≤9.

      Interventions

      Moderate-intensity physical activity (n=818) consisting of aerobic, resistance, and flexibility exercises performed both center-based (2times/wk) and home-based (3–4times/wk) sessions or health education program (n=817) consisting of weekly to monthly workshops covering relevant health information.

      Main Outcome Measures

      Physical function (gait speed over 400m) and lower extremity function (SPPB score) assessed at baseline and 6, 12, and 24 months.

      Results

      Greater baseline physical function (gait speed, SPPB score) was negatively associated with change in gait speed (regression coefficient β=−.185; P<.001) and change in SPPB score (β=−.365; P<.001), whereas higher number of steps per day measured by accelerometry was positively associated with change in gait speed (β=.035; P<.001) and change in SPPB score (β=.525; P<.001). Other baseline factors associated with positive change in gait speed and/or SPPB score include younger age (P<.001), lower body mass index (P<.001), and higher self-reported physical activity (P=.002).

      Conclusions

      Several demographic and physical activity–related factors were associated with the extent of change in functional outcomes in participants in the LIFE study. These factors should be considered when designing interventions for improving physical function in older adults with limited mobility.

      Keywords

      List of abbreviations:

      BMI (body mass index), CHAMPS (Community Healthy Activities Model Program for Seniors), CI (confidence interval), HE (health education), HR (hazard ratio), LIFE (Lifestyle Interventions and Independence for Elders), MMD (major mobility disability), OR (odds ratio), PA (physical activity), SPPB (Short Physical Performance Battery)
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        Archives of Physical Medicine and RehabilitationVol. 98Issue 3
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          The article “Predictors of Change in Physical Function in Older Adults in Response to Long-Term, Structured Physical Activity: The LIFE Study” (Layne et al, Arch Phys Med Rehabil 2017;98:11-24) was also supported in part by the Yale Training Program in Geriatric Clinical Epidemiology and Aging-Related Research (National Institute on Aging T32AG019134).
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