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- W2317252612 abstract "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<sup>−1</sup> – 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<sup>Wheel</sup>, 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 F<sub>RES</sub>, F<sub>TAN</sub>, rate of force development & FEF (P<0.05), while there was no difference in GE values (P=0.518). In pair-matched push frequencies (ASY<sub>80</sub>:SYN<sub>60</sub>, ASY<sub>100</sub>:SYN<sub>80</sub>, ASY<sub>120</sub>:SYN<sub>100</sub> and ASY<sub>140</sub>:SYN<sub>120</sub>), ASY propulsion forces remained significantly higher (F<sub>RES</sub>, F<sub>TAN</sub>, 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." @default.
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- W2317252612 date "2013-08-14" @default.
- W2317252612 modified "2023-10-16" @default.
- W2317252612 title "Hand-Rim Forces and Gross Mechanical Efficiency in Asynchronous and Synchronous Wheelchair Propulsion: A Comparison" @default.
- W2317252612 doi "https://doi.org/10.1055/s-0033-1345178" @default.
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