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Influence of Different Seating and Crank Positions on Muscular Activity in Elite Handcycling - A Case Study

Litzenberger, Stefan; Mally, Franziska; Sabo, Anton


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        <foaf:name>Litzenberger, Stefan</foaf:name>
        <foaf:givenName>Stefan</foaf:givenName>
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            <foaf:name>University of Applied Sciences Technikum Vienna</foaf:name>
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        <foaf:name>Mally, Franziska</foaf:name>
        <foaf:givenName>Franziska</foaf:givenName>
        <foaf:familyName>Mally</foaf:familyName>
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            <foaf:name>University of Applied Sciences Technikum Vienna</foaf:name>
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        <foaf:name>Sabo, Anton</foaf:name>
        <foaf:givenName>Anton</foaf:givenName>
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            <foaf:name>University of Applied Sciences Technikum Vienna</foaf:name>
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    <dct:title>Influence of Different Seating and Crank Positions on Muscular Activity in Elite Handcycling - A Case Study</dct:title>
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    <dct:issued rdf:datatype="http://www.w3.org/2001/XMLSchema#gYear">2015</dct:issued>
    <dcat:keyword>Handcycling</dcat:keyword>
    <dcat:keyword>Muscular Activity</dcat:keyword>
    <dcat:keyword>Seat</dcat:keyword>
    <dcat:keyword>Crank</dcat:keyword>
    <dct:issued rdf:datatype="http://www.w3.org/2001/XMLSchema#date">2015-09-23</dct:issued>
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    <dct:description>&lt;p&gt;Due to rising public focus scientific analysis of performance parameters is getting more and more important in paralympic sports.&amp;nbsp;Several studies have been performed to investigate different design parameters of handcycles (e.g. crank length) already;&amp;nbsp;however, most of those were done with able-bodied subjects, widely unfamiliar to handcycling. In this study bilateral surface&amp;nbsp;electromyography (sEMG) of several muscles of the upper body and arms of an elite handcyclist (multiple medal-winner in&amp;nbsp;Paralympic Games and World Championships) is performed with different crank lengths, crank positions and backrest positions&amp;nbsp;at power levels of 130, 160 and 190 W resulting in a total of 22 measurements. sEMG data were recorded bilaterally at a&amp;nbsp;recording frequency of 1000Hz using Ag/AgCl electrodes. Concurrently the crank position was acquired with ten Vicon Bonita&amp;nbsp;infrared cameras recording at 100 Hz. EMG data were rectified, smoothed and normalized to crank-cycle duration (0-360 deg)&amp;nbsp;for each single crank-cycle. Phases of activity for each muscle (i.e. EMG amplitude exceeds 30% of maximum amplitude) and&amp;nbsp;integrated EMG (iEMG) as an indicator for net muscular e ort were calculated. Results showed that amplitude and iEMG were&amp;nbsp;higher for higher power output and shorter cranks, crank and backrest position influenced several muscles but results were always&amp;nbsp;similar for similar shoulder-crank-distances. It could be shown, that muscular effort is clearly influenced by the handcycle&amp;nbsp;parameters investigated and that these measurements can be used to individually optimize the position in a handcycle with regard&amp;nbsp;to muscular effort.&lt;/p&gt;</dct:description>
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