Optimum propulsion technique in different wheelchair handrim diameter

Lan Yuen Guo, Fong-chin Su, Kai Nan An

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Variability in the propulsion technique to manual wheelchair users due to differences in level of injury and wheelchair fit makes detection of subtle changes in technique due to manipulation of individual variables nearly impossible. However, such changes are well suited to analytical modeling techniques, since variables can be manipulated systematically and the effects of the manipulation can be easily quantified. Therefore, we develop a simple two-dimensional model of the upper arm, forearm, and wheelchair wheel to study changes in wheelchair-user interface. Variations in handrim diameter were examined for their influence in the propulsive moment generated by each subject. The larger the handrim, the greater the moment about the wheel axle Mr could attain. The tangential force Ft applied to the handrim was similar among three handrim diameters. However, the radial component of force applied to the handrim increased as handrim diameter decreased. Increasing rim diameter increased the fraction effective force. Both predicted Mr and Ft reached the peak value in the terminal propulsion phase, in agreement with experimental results of the quasi-static wheelchair propulsion, but not dynamic, cyclic wheelchair propulsion. During the middle to terminal propulsion phase, the optimized force vector is not tangential to the handrim and instead, it pass through the upper arm segment which is comparable to dynamic wheelchair propulsion. Optimum analysis could help us to identify the effect of handrim diameter and investigate the related characteristics. Also, through modeling, the mechanical constraints of force application and the inadequate of pushing technique are further understood.

Original languageEnglish
Pages (from-to)1-10
Number of pages10
JournalJournal of Medical and Biological Engineering
Volume22
Issue number1
Publication statusPublished - 2002

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Wheelchairs
Propulsion
Wheels
Arm
Axles
Forearm
User interfaces
Wounds and Injuries

All Science Journal Classification (ASJC) codes

  • Biophysics

Cite this

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abstract = "Variability in the propulsion technique to manual wheelchair users due to differences in level of injury and wheelchair fit makes detection of subtle changes in technique due to manipulation of individual variables nearly impossible. However, such changes are well suited to analytical modeling techniques, since variables can be manipulated systematically and the effects of the manipulation can be easily quantified. Therefore, we develop a simple two-dimensional model of the upper arm, forearm, and wheelchair wheel to study changes in wheelchair-user interface. Variations in handrim diameter were examined for their influence in the propulsive moment generated by each subject. The larger the handrim, the greater the moment about the wheel axle Mr could attain. The tangential force Ft applied to the handrim was similar among three handrim diameters. However, the radial component of force applied to the handrim increased as handrim diameter decreased. Increasing rim diameter increased the fraction effective force. Both predicted Mr and Ft reached the peak value in the terminal propulsion phase, in agreement with experimental results of the quasi-static wheelchair propulsion, but not dynamic, cyclic wheelchair propulsion. During the middle to terminal propulsion phase, the optimized force vector is not tangential to the handrim and instead, it pass through the upper arm segment which is comparable to dynamic wheelchair propulsion. Optimum analysis could help us to identify the effect of handrim diameter and investigate the related characteristics. Also, through modeling, the mechanical constraints of force application and the inadequate of pushing technique are further understood.",
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Optimum propulsion technique in different wheelchair handrim diameter. / Guo, Lan Yuen; Su, Fong-chin; An, Kai Nan.

In: Journal of Medical and Biological Engineering, Vol. 22, No. 1, 2002, p. 1-10.

Research output: Contribution to journalArticle

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