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Is bearing resistance negligible during wheelchair locomotion? Design and validation of a testing device

Article dans une revue avec comité de lecture
Author
BASCOU, Joseph
175453 Arts et Métiers ParisTech
99538 Laboratoire de biomécanique [LBM]
SAURET, Christophe
99538 Laboratoire de biomécanique [LBM]
466360 Institut de Biomecanique Humaine Georges Charpak
LAVASTE, François
99538 Laboratoire de biomécanique [LBM]
466360 Institut de Biomecanique Humaine Georges Charpak
PILLET, Hélène
99538 Laboratoire de biomécanique [LBM]
466360 Institut de Biomecanique Humaine Georges Charpak

URI
http://hdl.handle.net/10985/15895
DOI
10.5277/ABB-00659-2016-03
Date
2017
Journal
Acta of Bioengineering and Biomechanics

Abstract

Purpose: Among the different resistances occurring during wheelchair locomotion and that limit the user autonomy, bearing resistance is generally neglected, based on a few studies carried out in static conditions and by manufacturer’s assertion. Therefore, no special attention is generally paid to the mounting and the maintenance of manual wheelchair bearings. However, the effect of inadequate mounting or maintenance on wheelchair bearing resistance has still to be clarified. This study aimed at filling this gap by developing and validating a specific device allowing the measurement of wheelchair bearing friction, characterized by low speed velocities, with an accuracy lower than 0.003 Nm. Methods: The bearing resistance measured by the device was compared to free deceleration measurement, intra and inter operator reproducibility were assessed. A factorial experiment allowed the effects of various functioning parameters (axial and radial loads, velocity) to be classified. Results: The device allowed significant differences in the bearing resistance of static and rotating conditions to be measured, even if a relatively high proportionality was found between both conditions. The factorial experiment allowed the expected impact of the radial load on bearing resistance as well as the predominant effect of the axial load to be demonstrated. Conclusions: As a consequence, it appeared that the control of the axial load is compulsory for measurement purposes or during wheel mounting, to avoid significant increase of global resistance during wheelchair locomotion. The findings of this study could help enhancing the models which assess manual wheelchair mechanical power from its settings and use conditions.

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