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Sensors 2014, 14(5), 8705-8717; doi:10.3390/s140508705

Test-Retest Reliability of a Pendant-Worn Sensor Device in Measuring Chair Rise Performance in Older Persons

1,* , 2
1 Personal Health Solutions Department, Philips Research Europe, High Tech Campus 34, Eindhoven 5656AE, The Netherlands 2 University of Groningen, University Medical Center Groningen, Center for Human Movement Sciences, Antonius Deusinglaan 1, Groningen 9713 AV, The Netherlands 3 Faculty of Biomedical Engineering, Czech Technical University, Nám. Sítná 3105, Kladno 2 272 01, Czech Republic 4 Institute of Movement and Sport Gerontology, German Sport University Cologne, Am Sportpark Müngersdorf 6, Cologne 50933, Germany
* Author to whom correspondence should be addressed.
Received: 25 March 2014 / Revised: 13 May 2014 / Accepted: 14 May 2014 / Published: 16 May 2014
(This article belongs to the Section Physical Sensors)
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Chair rise performance is incorporated in clinical assessments to indicate fall risk status in older persons. This study investigated the test-retest reliability of a pendant-sensor-based assessment of chair rise performance. Forty-one older persons (28 females, 13 males, age: 72–94) were assessed in two sessions with 3 to 8 days in between. Repeated chair rise transfers were measured after different instructions. Relative and absolute test-retest reliability of chair rise measurements in individual tests and average over all tests were evaluated by means of intra-class correlation coefficients (ICCs) and standard error of measurement (SEM) as a percentage of the measurement mean. Systematic bias between the measurements in test and retest was examined with paired t-tests. Heteroscedasticity of the measurements was visually checked with Bland-Altman plots. In the different test conditions, the ICCs ranged between 0.63 and 0.93, and the SEM% ranged between 5.7% and 21.2%. The relative and absolute reliability of the average over all tests were ICC = 0.86 and SEM% = 9.5% for transfer duration, ICC = 0.93 and SEM% = 9.2% for maximum vertical acceleration, and ICC = 0.89 and SEM% = 10.0% for peak power. The results over all tests indicated that a fall risk assessment application based on pendant-worn-sensor measured chair rise performance in daily life might be feasible.
Keywords: chair rise; reliability; fall risk; accelerometer chair rise; reliability; fall risk; accelerometer
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Zhang, W.; Regterschot, G.R.H.; Schaabova, H.; Baldus, H.; Zijlstra, W. Test-Retest Reliability of a Pendant-Worn Sensor Device in Measuring Chair Rise Performance in Older Persons. Sensors 2014, 14, 8705-8717.

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