Multisite comparison of wheelchair propulsion kinetics in persons with paraplegia

Short Title:
Multisite comparison of wheelchair propulsion kinetics in persons with paraplegia
Model System:
SCI
Reference Type:
Journal Article
Accession No.:
Journal:
J Rehabil Res Dev
Year, Volume, Issue, Page(s):
2007, vol. 44, issue 3, pp 449-458
Publication Website:
Abstract:
A multisite collaborative study is being conducted on the association between propulsion biomechanics and upper-limb injuries. This substudy compared subject characteristics and pushrim kinetics across three sites and identified early on in the main study any differences that could affect interpretation of the findings or data pooling. A total of 42 manual wheelchair users with paraplegia (14 from each site) performed 0.9 m/s and 1.8 m/s steady state propulsion trials and an acceleration-brake-coastdown trial on a wheelchair dynamometer while propulsion forces and moment about the hub were measured with a SmartWheel. Significant differences between two sites were found in peak and average resultant force (p < 0.05), peak and average moment at the slower steady state speed (p < 0.005), and peak and average torque at the faster steady state speed (p = 0.06). Subjects at the site with significantly lower forces and torques had a slower deceleration rate during coastdown compared with the subjects at the other two sites (p < 0.001). These results imply that rolling resistance is lower at one of the sites and likely due to differences in dynamometer properties. A mechanical method was used to site-normalize the data and enable data pooling for future analyses.
Author(s):
Koontz, A. M.; Yang, Y.; Price, R.; Tolerico, M. L.; Digiovine, C. P.; Sisto, S. A.; Cooper, R. A.; Boninger, M. L.
Author Address(es):
Human Engineering Research Laboratories, Department of Veterans Affairs Pittsburgh Healthcare System, 7180 Highland Drive, 151R1-H, Pittsburgh, PA 15206. akoontz@pitt.edu

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