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Pubmed for Handhelds

PUBMED FOR HANDHELDS

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  • Title: Consequence of feedback-based learning of an effective hand rim wheelchair force production on mechanical efficiency.
    Author: de Groot S, Veeger HE, Hollander AP, van der Woude LH.
    Journal: Clin Biomech (Bristol); 2002 Mar; 17(3):219-26. PubMed ID: 11937260.
    Abstract:
    OBJECTIVE: Investigation of the effect of visual feedback on effective hand rim wheelchair force production and the subsequent effect on gross mechanical efficiency. DESIGN: Ten subjects in an experimental group and 10 subjects in a control group practised three weeks (3.wk(-1), i.e., a pre-test and 8 trials) on a computer-controlled wheelchair ergometer. Every trial consisted of two blocks of 4 min at 0.15 and 0.25 W.kg(-1) at 1.11 m.s(-1). On three trials an additional block at 0.40 W.kg(-1) was performed. The experimental group practised with and the control group practised without visual feedback on the effectiveness of force production. BACKGROUND: In mechanical terms, the low gross mechanical efficiency of hand rim wheelchair propulsion may be the result of ineffective force production. METHODS: During all trials oxygen uptake, power output, forces and torque on the hand rims were measured. RESULTS: In comparison with the control group, the experimental group at trial 8 had a significantly more effective force production compared to the control group (90-97% vs. 79-83%, respectively), but showed a significantly lower mechanical efficiency (5.5-8.5% vs. 5.9-9.9%, respectively). CONCLUSION: Findings indicate that the most effective force production from a mechanical point of view is not necessarily the most efficient way--in terms of energy cost-- from a biological point of view and that force direction is based on an optimization of cost and effect. RELEVANCE: Learning a more effective force production by visual feedback is not useful for increasing the mechanical efficiency of hand rim wheelchair propulsion.
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