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Hand-rim forces and gross mechanical efficiency in asynchronous and synchronous wheelchair propulsion: a comparison

journal contribution
posted on 27.06.2016 by John P. Lenton, Lucas H.V. van der Woude, N. Fowler, Graham Nicholson, Keith Tolfrey, Vicky Goosey-Tolfrey
To compare the force application characteristics at various push frequencies of asynchronous (ASY) and synchronous (SYN) hand-rim propulsion, 8 able-bodied participants performed a separate sub-maximal exercise test on a wheelchair roller ergometer for each propulsion mode. Each test consisted of a series of 5, 4-min exercise blocks at 1.8 m · s-1 - initially at their freely chosen frequency (FCF), followed by four counter-balanced trials at 60, 80, 120 and 140% FCF. Kinetic data was obtained using a SMART Wheel, measuring forces and moments. The gross efficiency (GE) was determined as the ratio of external work done and the total energy expended. The ASY propulsion produced higher force measures for FRES, F TAN, rate of force development & FEF (P<0.05), while there was no difference in GE values (P=0.518). In pair-matched push frequencies (ASY80:SYN60, ASY100:SYN80, ASY 120:SYN100 and ASY140:SYN120), ASY propulsion forces remained significantly higher (FRES, F TAN, rate of force development & FEF P<0.05), and there was no significant effect on GE (P=0.456). Both ASY and SYN propulsion demonstrate similar trends: changes in push frequency are accompanied by changes in absolute force even without changes in the gross pattern/trend of force application, FEF or GE. Matched push frequencies continue to produce significant differences in force measures but not GE. This suggests ASY propulsion is the predominant factor in force application differences. The ASY would appear to offer a kinetic disadvantage to SYN propulsion and no physiological advantage under current testing conditions. © Georg Thieme Verlag KG Stuttgart New York.

History

School

  • Sport, Exercise and Health Sciences

Published in

International Journal of Sports Medicine

Volume

35

Issue

3

Pages

223 - 231

Citation

LENTON, J.P. ... et al, 2014. Hand-rim forces and gross mechanical efficiency in asynchronous and synchronous wheelchair propulsion: a comparison. International Journal of Sports Medicine, 35 (3), pp.223-231

Publisher

© Georg Thieme Verlag KG Stuttgart

Version

NA (Not Applicable or Unknown)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2014

Notes

This paper is closed access.

ISSN

0172-4622

eISSN

1439-3964

Language

en

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