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Journal of Aging Research
Volume 2012, Article ID 954378, 9 pages
http://dx.doi.org/10.1155/2012/954378
Research Article

Validity and Reliability of Accelerometer-Based Gait Assessment in Patients with Diabetes on Challenging Surfaces

1Institute of Human Movement Sciences and Sport, ETH, 8093 Zurich, Switzerland
2Sensory-Motor Systems Lab, ETH, Zurich, Switzerland
3Center for Human Movement Sciences, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
4Institut für Bewegungs- und Sportgerontologie, Deutsche Sporthochschule Köln, Köln, Germany

Received 25 April 2012; Revised 17 June 2012; Accepted 25 June 2012

Academic Editor: Bijan Najafi

Copyright © 2012 Eling D. de Bruin et al. 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.

Abstract

Walking on irregular terrain influences gait of diabetic patients. We investigate the test-retest reliability and construct validity of gait measured with the DynaPort MiniMod under single and dual task conditions in diabetic patients walking on irregular terrain to identify the measurement error (precision) and minimal clinical detectable change. 29 patients with Type 2 diabetes were measured once, and 25 repeated the measurement within 7 days. Patients walked on a therapy garden walkway. Differences between three groups of diabetics with various levels of lower extremity neuropathy were analyzed with planned contrasts. ICC was excellent for intervisit measurements with ICC's > 0 . 8 2 4 . Bland and Altman Plots, SEM, and SDD showed precise values, distributed around zero for both test conditions. A significant effect of grouping on step length performance hints at possible construct validity of the device. Good reliability of DynaPort MiniMod measurements on a therapy garden walkway and an indication for discriminatory capability suggests that DynaPort MiniMod could facilitate the study of gait in diabetic patients in conditions close to real-life situations. Good reliability, small measurement error, and values of minimal clinical detectable change recommend the further utilization of DynaPort MiniMod for the evaluation of gait parameters in diabetic patients.