Journals of Gerontology Series A: Biological Sciences and Medical Sciences Large Type Edition
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The Journals of Gerontology Series A: Biological Sciences and Medical Sciences 61:718-725 (2006)
© 2006 The Gerontological Society of America

Evaluating Task Modification as an Objective Measure of Functional Limitation: Repeatability and Comparability

Todd M. Manini, Summer B. Cook, Tom VanArnam, Moshe Marko and Lori Ploutz-Snyder

1 Department of Exercise Science, Syracuse University, New York.
Departments of 2 Physical Therapy and 3 Physical Medicine Rehabilitation, SUNY Upstate Medical University, Syracuse, New York.

Address correspondence to Todd Manini, PhD, Laboratory of Epidemiology, Demography and Biometry, National Institute on Aging, Gateway Bldg., Suite 3C-309, 7201 Wisconsin Ave., Bethesda, MD 20892-9205. E-mail: maninit{at}mail.nih.gov

Background. Modification of everyday tasks in older adults is associated with risk of deleterious health outcomes. The purpose of this study was to develop a task modification scale to examine its reliability and comparability to timed performance and common measures of physical function and impairment.

Methods. Eighty-two (21 men, 61 women) older adults (74.4 ± 8.2 years) were observed performing a chair rise (sitting heights: 43 cm, 38 cm, and 30 cm), stair ascent/descent, and kneel and supine rise tasks. Six hierarchically ranked categories (0–5) of modification were created for each task and then summed across tasks (summary modification [MOD] score: range 0–35). Comparisons were made with timed performance, knee extension strength, single-leg balance, self-reported function, five chair stands, and gait speed.

Results. Inter-rater reliability (intra-class correlation = 0.98) and participant repeatability (intra-class correlation = 0.92) of the MOD score were excellent. Ninety-six percent of participants modified at least one task (MOD score: 10.5 ± 7.51, range 0–27). After adjusting for task modification, timed performance showed a lower association with gait speed (time vs MOD score, semipartial r2 = 0.31 vs 0.68), strength (semipartial r2 = 0.14 vs 0.65), and single-leg balance (semipartial r2 = 0.10 vs 0.40) than did the MOD score. The MOD score showed higher correlations with muscle strength and balance impairment than did other measures of functional limitation such as gait speed, time to complete five chair stands, and self-reported physical function.

Conclusion. Documentation of task modification is reliable across raters and repeatable within participants; in addition, it compares well with other measures of physical function and impairment. Task modification reveals important and intuitive information regarding physical limitation, and deserves greater attention.







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