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Intraday Reliability and Sensitivity of Four Functional Ability Tests in Older Women

Dewhurst, Susan PhD; Bampouras, Theodoros M. MSc

American Journal of Physical Medicine & Rehabilitation:
doi: 10.1097/PHM.0000000000000078
Brief Report
Abstract

ABSTRACT: Functional tests are commonly used to evaluate the functional ability of older individuals; however, intraday reliability and sensitivity are required to enable informed decisions on whether repeated trials are necessary and to ensure that the values obtained from a single session are a patient’s true score. This study aimed to investigate the intraday reliability and sensitivity of four commonly used functional tests in older individuals. Seventy-one healthy older women (mean [SD]: age, 71.7 [7.3] yrs; body mass, 64.8 [10.2] kg; stature, 1.58 [0.07] m) performed the 6-m maximum walking speed, timed 8-foot up-and-go, chair sit-and-reach, and back scratch tests three times in one single session, with 1 min between trials. Reliability between all trials was examined using intraclass correlation coefficient, and sensitivity was examined using typical error. All tests were highly reliable (intraclass correlation coefficient range, 0.89–0.99), indicating no need for a familiarization trial. Typical error between trials 2 and 1 were 0.06 m·s1, 0.42 s, 1.13 cm, 0.92 cm for the 6-m maximum walking speed, timed 8-foot up-and-go, chair sit-and-reach, and back scratch tests, respectively. Practitioners should perform two trials to examine whether the difference between them is less than the typical error reported here. These results should help practitioners ensure that scores obtained from an individual from these functional tests are a true reflection of their functional ability rather than measurement error.

Author Information

From the University of Cumbria, Faculty of Health and Science, Department of Medical and Sport Sciences, Active Ageing Research Group, Lancaster, UK (SD, TMB); and Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, UK (SD).

All correspondence and requests for reprints should be addressed to: Theodoros M. Bampouras, MSc, University of Cumbria, Faculty of Health and Science, Department of Medical and Sport Sciences, Active Ageing Research Group, Lancaster, UK.

Financial disclosure statements have been obtained, and no conflicts of interest have been reported by the authors or by any individuals in control of the content of this article.

Copyright © 2014 Wolters Kluwer Health, Inc. All rights reserved.