Biomechanical Analysis of Successful and Unsuccessful Snatch Lifts in Elite Female Weightlifters

Abstract

The aim of this study was to identify biomechanical factors affecting successful and unsuccessful snatch attempts in elite female weightlifters during the 2013 World Weightlifting Championships. Fourteen female competitors took part in this study. Their successful and unsuccessful snatch lifts with the same load were recorded with 2 camcorders (50 Hz), and selected points were digitized manually on to the body and the barbell using the Ariel Performance Analysis System. The kinetic and kinematic barbell movement as well as the athlete’s body movement variables during the liftoff phase were examined. The results of this study show statistical differences (p ≤ 0.05) between successful and unsuccessful attempts in relation to the angle values in the knee and hip joints in preparation for the aerial phase position. Similarly, the center of gravity velocity was significantly higher in successful attempts during the catch phase. Thus, coaches should pay particular attention to the accuracy of the execution in preparation for the aerial phase position and to the velocity of the center of gravity of the competitors during the catch phase.

Analysis of Biomechanical Parameters of Martial Arts Routine Athletes’ Jumping Difficulty Based on Image Recognition

“…In addition, it can be seen from the comparison curve of the center of gravity speed and displacement that martial arts routine athletes change evenly in the center of gravity speed during the entire movement process, which lays the foundation for their stable jumping support [ 10 ]. Through a series of data analysis, Mastalerz et al [ 11 ] concluded that, in the practice of martial arts jumping movements based on muscle strength, attention should be paid to strengthening the coordinated development of upper and lower limb muscle strength and the flexibility of the legs [ 11 ]. In the study by Tagaev et al [ 12 ], the kinematics comparative analysis of the sidekicks and the upright jumps of the martial arts routine athlete and Zhang Yanan, the two champions, was found in the comparison.…”

Weightlifting: An Applied Method of Technical Analysis

“…It has been shown that higher skilled lifters have a faster movement under the barbell as displayed by an increase in their CoG velocity (8). This is also highlighted when comparing successful and unsuccessful snatches and maximal versus submaximal loads, where successful and maximal loads show an increase in velocity of CoG between the end of the second pull and peak bar height (30,48). Given the speed of the descent, it becomes difficult to identify stable components that are able to be seen through live observational analysis; however, it can be postulated that flexion of the knees should have begun in preparation for the catch when the barbell is at its peak height and the athlete should be descending into the receive position.…”

Comparison of Force Measures Between Start Position, Transition Phase, and Midthigh Pull With Weightlifting Performance During Israel National Competition

“…The first pull is recognized from the moment the plates are lifted from the floor to the point in which the knees are at their first maximum extension (7,15). This initial pull is believed to be critical in the performance of elite-level weightlifters, who have displayed greater relative maximal force capability than district-level lifters during the first pull (33). In addition, the first pull is integral to the efficiency of the entire lift facilitating a more efficient transition phase and, subsequently, a greater application of vertical ground reaction forces in the second pull (15).…”

“…No study has examined the relationship between peak force during the transition phase in weightlifting performance. The transition phase exhibits unique kinetic and kinematic characteristics, which requires a high level of technical ability (7,14,18,33,36). Considering the limited number of studies that have compared the different pulling positions on weightlifting performance, it was the purpose of this investigation to examine the association of force output and RFD in the 3 pulling phases to weightlifting performance in competitive Israeli weightlifters.…”