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KOPARMA TEKNiGiNiN BiVOMEKANiGi

BIOMECHANICAL ANALYSIS AND MODELLING OF SNATCH TECHNIQUE

Journal Name:

  • Hacettepe Üniversitesi Spor Bilimleri Dergisi

Publication Year:

  • 2006

Key Words:

Keywords (Original Language):

Author NameUniversity of AuthorFaculty of Author
Abstract (2. Language): 
Snatch is a complex sports event in the Olympic weightlifting. The joint forces and moments not onlyplay an important role in the dynamics ofsuccessfullifting but theyare also related to sports injuries. In this study, the human body was modelled as a simplified rigid body. Three-Dimensional (30) joint forces were calculated during the snatch attempt. The snatch movement of 65 kg weights was captured by using four high-speed digital cameras. The ground reaction forces were also recorded byusing a synchronised force plate. The four camera views were processed by using Simi Motion software, and 3D spatial coordinates ofanthropometric points were obtained byutilising DLT algorithm. Thejoint forces and moments were calculated by utilising inverse dynamics into the rigid body model. The validity of the rigid body model was evaluated by comparing with calculated and measured ground reaction forces. In the calculations, the magnitude of the vertical ground reaction force was higher for the rigid body model compared to the measured values. Finally, the vertical ankle joint force was the largest in magnitude during lift. The shoulderjoint moments were also higher than the otherjoints. As a result, rigid bodymodelshows similarresults andrepresents the reallife.
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Abstract (Original Language): 
Halterde koparma tekniği, dinamiği son derece karmaşık olan olimpik bir spor dendır. Koparma tekniğinde etkili olan eklem kuwetleri kaldmşm başansını etkilediği kadar spor yaralanmalarmm boyutunu ve görülme sıkllğmı da belirleyen dinamiklerdir. Bu çalışmanın amacı, koparma tekniğinde eklemlerde etkili olan kuwetleri hesaplamak ve bu hesaplamalar için önerilen modelin geçerliğini test etmektir. Önerilen modelde insan vücudu silindirik katı cisim olarak kabul edilen sekiz üyeden otuşmekiedır. Bu üyeler, ayak, alt bacak, üst bacak, üst kol, ön koi ile gövde ve başm yansıdır. Çalışmaya bir elit halterci almdı. Haltercinin 65 kg koparma kaldmşmm görüntüsü dört adet sayısal kamera kullanılarak bilgisayar ortammda kaydedildi. Hareket analizi yazılımı (SIMI Motion) kullanılarak dört ayn kamera görüntüsü işlendi. Antropometrik noktalarm üç boyutlu kinematik verisi Doğrudan Doğrusal Dönüşüm algoritması ile hesaplandı. Vücut üyelerinin kütlesi ve üye kütle merkezi Clauser ve ark. (1969)'nm verisi kullanılarak hesaplandı. Serbest cisim diyagrammda tanımlanan ve kaldmş sıresınde etkili olan eklem kuwetleri görüntünün sayısallaştmlması sonucu elde edilen kinematik veriden Newton-Euler hareket denklemleri kullanılarak ters dinamik analiz ile üç boyutlu olarak hesaplandı. Modelin geçerliğini test etmek için gerekli olan yer tepki kuweti hareket analiz ile eşzamanlı olarak kuwet platformu kullanılarak ölçüldü. Koparma tekniği için oluşturulan katı cisim modelinden hesaplanan dikey yer tepki kuwetinin büyüklüğü kuwet platformu ile ölçülen dikey yer tepki kuwetinden daha fazla olduğu gözlemlendi. Model yardımıylahesaplanan yertepki kuwetleri ile koparma hareketi sıresınde ölçülen yer tepki kuwetleri karşılaştmldığmda davranışlarm benzerliği katı cisim modelinin geçerliğini gösterdi. Katı cisim modelinden hesaplanan yer tepki kuwetlerinin kabuller çerçevesinde koparma hareketini temsil ettiği ve dinamik modelin de geçerli biryaklaşım olduğusonucuna vanldı.
FULL TEXT (PDF): 
PDF icon arastrmx_152775_17_pp_124-142.pdf
  • 3
124-142
  • Turkish

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