Conference paper Open Access

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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{
  "publisher": "Zenodo", 
  "DOI": "10.5281/zenodo.3402731", 
  "language": "eng", 
  "title": "Influence of Different Seating and Crank Positions on Muscular Activity in Elite Handcycling - A Case Study", 
  "issued": {
    "date-parts": [
      [
        2015, 
        9, 
        23
      ]
    ]
  }, 
  "abstract": "<p>Due to rising public focus scientific analysis of performance parameters is getting more and more important in paralympic sports.&nbsp;Several studies have been performed to investigate different design parameters of handcycles (e.g. crank length) already;&nbsp;however, most of those were done with able-bodied subjects, widely unfamiliar to handcycling. In this study bilateral surface&nbsp;electromyography (sEMG) of several muscles of the upper body and arms of an elite handcyclist (multiple medal-winner in&nbsp;Paralympic Games and World Championships) is performed with different crank lengths, crank positions and backrest positions&nbsp;at power levels of 130, 160 and 190 W resulting in a total of 22 measurements. sEMG data were recorded bilaterally at a&nbsp;recording frequency of 1000Hz using Ag/AgCl electrodes. Concurrently the crank position was acquired with ten Vicon Bonita&nbsp;infrared cameras recording at 100 Hz. EMG data were rectified, smoothed and normalized to crank-cycle duration (0-360 deg)&nbsp;for each single crank-cycle. Phases of activity for each muscle (i.e. EMG amplitude exceeds 30% of maximum amplitude) and&nbsp;integrated EMG (iEMG) as an indicator for net muscular e ort were calculated. Results showed that amplitude and iEMG were&nbsp;higher for higher power output and shorter cranks, crank and backrest position influenced several muscles but results were always&nbsp;similar for similar shoulder-crank-distances. It could be shown, that muscular effort is clearly influenced by the handcycle&nbsp;parameters investigated and that these measurements can be used to individually optimize the position in a handcycle with regard&nbsp;to muscular effort.</p>", 
  "author": [
    {
      "family": "Litzenberger, Stefan"
    }, 
    {
      "family": "Mally, Franziska"
    }, 
    {
      "family": "Sabo, Anton"
    }
  ], 
  "id": "3402731", 
  "type": "paper-conference", 
  "event": "7th Asia-Pacific Congress on Sports Technology (APCST 2015)"
}
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