This article and any supplementary material should be cited as follows: Lui J, MacGillivray MK, Sheel AW, Jeyasurya J, Sadeghi M, Sawatzky BJ. Mechanical.

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Presentation transcript:

This article and any supplementary material should be cited as follows: Lui J, MacGillivray MK, Sheel AW, Jeyasurya J, Sadeghi M, Sawatzky BJ. Mechanical efficiency of two commercial lever-propulsion mechanisms for manual wheelchair locomotion. J Rehabil Res Dev. 2013;50(10):1363– Slideshow Project DOI: /JRRD JSP Mechanical efficiency of two commercial lever-propulsion mechanisms for manual wheelchair locomotion Jordon Lui, BKin; Megan K. MacGillivray, MSc; A. William Sheel, PhD; Jeswin Jeyasurya, MASc; Mahsa Sadeghi, MD; Bonita Jean Sawatzky, PhD

This article and any supplementary material should be cited as follows: Lui J, MacGillivray MK, Sheel AW, Jeyasurya J, Sadeghi M, Sawatzky BJ. Mechanical efficiency of two commercial lever-propulsion mechanisms for manual wheelchair locomotion. J Rehabil Res Dev. 2013;50(10):1363– Slideshow Project DOI: /JRRD JSP Aim – Evaluate mechanical efficiency (ME) of 2 lever- propulsion mechanisms (torsion spring and roller clutch) for wheelchairs. – Compare ME of lever vs hand rim propulsion within same wheelchair. Relevance – Conventional wheelchairs have hand rims for manual propulsion, which can be energetically inefficient.

This article and any supplementary material should be cited as follows: Lui J, MacGillivray MK, Sheel AW, Jeyasurya J, Sadeghi M, Sawatzky BJ. Mechanical efficiency of two commercial lever-propulsion mechanisms for manual wheelchair locomotion. J Rehabil Res Dev. 2013;50(10):1363– Slideshow Project DOI: /JRRD JSP Method Subjects – 10 nondisabled males. Procedure – Performed submaximal exercise tests with both lever- propulsion mechanisms and hand rim propulsion on 2 different wheelchairs. Measures – Cardiopulmonary parameters (O 2 uptake [VO 2 ], heart rate [HR], energy expenditure [En]). – Total external power (P ext ) using drag test protocol. – ME (ratio of P ext to En).

This article and any supplementary material should be cited as follows: Lui J, MacGillivray MK, Sheel AW, Jeyasurya J, Sadeghi M, Sawatzky BJ. Mechanical efficiency of two commercial lever-propulsion mechanisms for manual wheelchair locomotion. J Rehabil Res Dev. 2013;50(10):1363– Slideshow Project DOI: /JRRD JSP Results No significant effect by lever-propulsion mechanism for all physiological measures. – Suggests torsion spring didn’t have physiological benefit vs roller clutch mechanism. Both lever-propulsion mechanisms showed decreased VO 2 and HR and increased ME (as function of slope) vs hand rim propulsion.

This article and any supplementary material should be cited as follows: Lui J, MacGillivray MK, Sheel AW, Jeyasurya J, Sadeghi M, Sawatzky BJ. Mechanical efficiency of two commercial lever-propulsion mechanisms for manual wheelchair locomotion. J Rehabil Res Dev. 2013;50(10):1363– Slideshow Project DOI: /JRRD JSP Conclusion Both lever-propulsion mechanisms tested are more mechanically efficient than conventional hand rim propulsion, especially when slopes are encountered.