Biomechanics of the clean and jerk in weightlifting national Jordanian team

• Autores: Amer I. Al-Khleifat, Maher Al-Kilani, Hashem A. Kilani
• Localización: Journal of Human Sport and Exercise: JHSE, ISSN-e 1988-5202, Vol. 14, Nº. Extra 5, 2019 (Ejemplar dedicado a: Summer Conferences of Sports Science), págs. 2429-2434
• Idioma: inglés
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• Resumen

  • Seven elite national Jordanian weightlifters were videoed at 50 fields per second from the sagittal plane during the execution of the clean and jerk (C&J) on an AMTI force platform with 3 weights of submaximal lifts; low medium and high weights (35%, 65%, 85%) of their maximum. Linear and angular kinematics of the barbell with the ground reaction forces histories of the lower body were analysed using Kinova & APAS. A significant decrease was found in the maximum vertical velocity of the barbell during the second pull of the heaviest lift (p < 0.05). Maximum extension velocity of the hip joint significantly increased during the first pull of the heaviest lift (p < 0.05). Vertical velocity and maximum bar height decreased during the second pull, especially at 85%. Angle-angle diagrams of the knee and hip profile showed major differences among participants, especially at the 85% lift of their maximum.