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Lever propulsion mechanisms possess few adjustable parameters.
We conducted series of experiments and obtained quantitative results about the shoulder joint contact force for lever propulsion on three different gear ratios of the lever propulsion mechanism.
However, there is no quantitative information about shoulder joint contact force during lever propulsion.
These results suggested that lever propulsion may mitigate the risk of secondary joint disorders.
The cadence increased when the gear ratio of the lever propulsion tests was lowered (Fig. 6).
It was revealed that the handrim push angle was larger than the lever propulsion push angle.
For the lever propulsion tests we used three gear ratios: 1.5, 1, and 1/1.5.
However, the push phase of the lever propulsion was shorter (Fig. 8).
For the lever propulsion experiment we utilized a commercially available lever-propulsion mechanism (NuDrive; Pure Global Ltd., UK) connected to a wheelchair wheel with a diameter 595 mm, model HHR-4; OX Engineering Co. Ltd., Japan,.
The results could inform prescription and adjustment of wheelchair lever propulsion mechanisms, making them easier and much precise.
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Lever-propulsion mechanisms became a strong alternative to the handrim propulsion.
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