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BioMed Research International - Volume 2014 2014, Article ID 645284, 10 pages -

Clinical StudyVA Pittsburgh Healthcare System, 6425 Penn Avenue, Suite 400, Pittsburgh, PA 15206, USA

Received 14 March 2014; Revised 4 May 2014; Accepted 9 June 2014; Published 3 July 2014

Academic Editor: Yih-Kuen Jan

Copyright © 2014 Manoela Ojeda and Dan Ding. 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.


Due to lower limb paralysis, individuals with spinal cord injury SCI rely on their upper limbs for mobility. The prevalence of upper extremity pain and injury is high among this population. We evaluated the performance of three triaxis accelerometers placed on the upper arm, wrist, and under the wheelchair, to estimate temporal parameters of wheelchair propulsion. Twenty-six participants with SCI were asked to push their wheelchair equipped with a SMART

. The estimated stroke number was compared with the criterion from video observations and the estimated push frequency was compared with the criterion from the SMART

. Mean absolute errors MAE and mean absolute percentage of error MAPE were calculated. Intraclass correlation coefficients and Bland-Altman plots were used to assess the agreement. Results showed reasonable accuracies especially using the accelerometer placed on the upper arm where the MAPE was 8.0% for stroke number and 12.9% for push frequency. The ICC was 0.994 for stroke number and 0.916 for push frequency. The wrist and seat accelerometer showed lower accuracy with a MAPE for the stroke number of 10.8% and 13.4% and ICC of 0.990 and 0.984, respectively. Results suggested that accelerometers could be an option for monitoring temporal parameters of wheelchair propulsion.

Autor: Manoela Ojeda and Dan Ding

Fuente: https://www.hindawi.com/


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