Lower Extremities’ Kinematic Sequence and Kinetics during first Pull in Classic Snatch

Autor: Kevin Tan, Saju Joseph, Ali Md Nadzalan
Jazyk: angličtina
Rok vydání: 2021
Předmět:
Zdroj: Sport Mont, Vol 19, Iss 2, Pp 35-39 (2021)
Druh dokumentu: article
ISSN: 1451-7485
2337-0351
DOI: 10.26773/smj.210606
Popis: The primary purpose of this study was to identify and compare the lower extremities’ kinematic joints initiation sequence during the first pull phase of the classic snatch among male and female elite weightlifting athletes. As the secondary purpose, the maximal angle extension of joints, sub-phase duration, joint angular displace- ment and velocity, barbell velocity and the ground reaction force produced during the classic snatch sub-phases were determined and compared between genders. Six men (age: 19.9±2.29 years, height: 1.67±0.04 m, and body mass: 87.96±2.68 kg) and six women (age: 19.72±1.35 years, height: 1.55±0.42 m, and body mass: 70.25±10.78 kg) were tested for 85% of their 1 repetition classical snatch movement. Kinematics were captured at 100 Hz us- ing a Qualisys motion capture system with eight cameras, and markers were placed bilaterally on the hips, knees and ankle joints. Kinetics were captured using the Kistler fixed force plate. The results revealed that a significant difference between males and females in term of hip joint initiation sequence, ground reaction force and barbell velocity. The hip angle among the female athletes initiates the start movement earlier than among male athletes. The ground reaction force and barbell velocity are higher in males compared to females. These findings suggest that the female weightlifters are not in a position to produce higher degrees of extension, thus reducing their efficiency in lifting and ability to take more substantial resistance. Having a limited angle extension results in the involved muscles not being fully contracted.
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