A master thesis from Aalborg University
A Biomechanical Analysis of Clear Strokes in Badminton Executed by Youth Players of Different Skill Levels
[En biomekanisk analyse af clearslag i badminton udført af ungdomsspillere på forskelligt niveau]
Author(s)
Term
4. semester
Education
Publication year
2010
Submitted on
2010-12-20
Pages
22 pages
Abstract
Flere studier har understreget vigtigheden af bestemte fænomener, når dygtige udøvere har udført forskellige kaste- og slagbevægelser. Dette være sig over- og underarmens rotation omkring egen længdeakse og den proximale-distale koordination af de involverede segmenter. Målet med dette studie var at undersøge biomekaniske forskelle i den slagtekniske udførelse af en forhånds- og baghåndsclearslag for hhv. dygtige og mindre dygtige ungdomsspillere. I alt deltog 20 forsøgspersoner i studiet, hvoraf 10 var dygtige spillere og 10 var mindre dygtige spillere. Reflektive markører var påsat forsøgspersons krop og ketsjer, og data blev optaget via et motion capture system, som bestod af otte højhastighedskameraer med en sampling rate på 500 Hz. Resultaterne viste at begge typer af forsøgspersoner udførte forhåndsclearen på stort set samme måde, hvorimod teknikken i baghåndsslaget var signifikant forskelligt. Over- og underarmens rotation omkring længdeaksen opnåede de højeste vinkelhastigheder af alle ledbevægelser, hvilket pointerer vigtigheden af disse rotationer i slaget. De dygtige udøvere opnåede signifikant højere vinkelhastigheder for udadrotationen af overarmen, supination af underarmen samt håndledsekstensionen i baghåndsslaget. Modsat blev der ikke fundet nogle signifikante forskelle for forhåndsslaget. Alle forsøgspersoner benyttede sig af et proximalt-distalt bevægelsesmønster i forhåndsclearslaget mht. effekt over led som følge af reaktionskræfter. Resultaterne viste, at de overførte en signifikant energimængde fra proximale segmenter til distale via ledreaktionskræfter. I baghåndsslaget benyttede de dygtige spillere ligeledes et proximalt-distalt mønster, hvorimod de mindre gode spillere afveg fra dette, hvorfor de gode spillere overførste en signifikant større energi mængde til de distale segmenter fra reaktionskræfter i leddene.
Several studies have emphasized the importance of certain phenomenas when skilled athletes perform throwing or hitting tasks. Such phenomenas include the longitudinal axis rotations of the upper arm and forearm and the proximal-distal sequencing of the involved segments. The aim of the present study was investigate biomechanical differences in stroke technique between youth badminton players of different skill levels, where the afore-mentioned phenomenas were subject to the analysis. The forehand and backhand clear strokes were chosen for the analysis. A total of 20 subjects participated in the study; 10 skilled players and 10 less skilled players. Reflective spherical markers were attached to the subject's body and the racket. The data was recorded using a motion capture system consisting of eight high-speed cameras sampling at a frame rate of 500 Hz. The results showed that both types of subjects executed the forehand clear stroke much the same way, whereas the technique in the backhand clear stroke was quite differently. The longitudinal axis rotations reached the highest angular velocities of all joint movements, supporting the idea that such joint movements may play a crucial role in producing high racket head speeds. The skilled players reached significantly higher angular velocities for the glenohumeral external rotation, elbow supination and wrist extension in the backhand stroke. However, no such differences were found in the forehand stroke. Both types of subjects utilized a proximal-distal sequence in the forehand clear stroke, with regards to peak joint powers from joint reaction forces. As a consequence, they transferred a significant amount of energy from the proximal segments to the distal segments via joint reaction forces. Regarding the backhand clear stroke, the skilled players utilized a proximal-distal sequence, whereas the less skilled players deviated from this in some way. As a result, the skilled players transferred a significantly greater amount of energy to the distal segments due to joint reaction forces.
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