Kinematic Analysis of the Snatch Technique used by Japanese and International Female Weightlifters at the 2006 Junior World Championship

Abstract

The purpose of the present study was to compare the snatch techniques of Japanese and international female weightlifters using kinematic analysis. Motion analysis of the snatch techniques conducted using videos recorded at the 2006 Women's Junior World Weightlifting Championship. The results indicated no significant differences between the snatch techniques of Japanese and international weightlifters in terms of the kinematic parameters expressed by the barbell trajectory and joint angles. However, the interval of time between the peak velocity of the hip joint and peak vertical velocity of the barbell was longer for Japanese weightlifters, while the power applied to the barbell was 35% greater for international weightlifters. These findings indicate that differences in strength and power production affected the performances of Japanese and international weightlifters. Material : Coaching and Training weightlifting squad (Gourgoulis et al., 2004). Hoover et al. made a 2-dimensional kinematic analysis on weightlifters in the U.S. National Weightlifting Championships and then suggested that the drop distance during the catch phase was long in comparison with existing reports on male weightlifters (Figure 1). Further, a study on international level weightlifters reported that male weightlifters had slower maximum velocities of the barbell being lifted than female weightlifters had (Garhammer, 1991). Thus, the previous studies on female weightlifters have shown several differences from male weightlifters. To be more competitive, it may be important to accumulate information about not only such gender differences but also various factors, e.g., Japanese domestic competitors vs. international competitors, competitive level, and age.The purpose of the present study was to clarify the technical characteristics of international and Japanese weightlifters, by analyzing kinematic movements during the snatch of female weightlifters who appeared in the Junior World Weightlifting Championships. Junior weightlifters refer to competitors 20 years old and younger, but some of them have established world or national records, outperforming senior weightlifters. By evaluating the techniques of those elite weightlifters, the present study was also intended to describe the snatch techniques of current female weightlifters and obtain information that contributes to competition improvement for Japanese competitors participating in international competitions. Methods Material and subjectsIn the 12th Women's Junior World Weightlifting Championships, held in Hangzhou, China from May 28 to June 3, 2006, the attempts of Japanese representative weightlifters and higher-ranking winners in each class were recorded by a video camera. The recordings were done as part of a research project of the Japan Weightlifting Association Sports Medicine Committee.Of the recorded attempts, the best performed attempts of the World champion (WC) and Japanese representative (JP) weightlifters were analyzed. Table 1 shows the final result and body weight of the...

A Biomechanical Comparison of Successful and Unsuccessful Snatch Attempts among Elite Male Weightlifters

“…In other words, an unsuccessful lift occurs not only when the lifted weight exceeds the lifters’ weight maximum, but when technical factors are at play. Studies on snatch performance have focused mainly on the differences between superior and inferior lifters, or the difference between the lifted barbell weight with respect to barbell kinematics, kinetics, and joint kinematics [1,2,3]. Measurement findings of these studies revealed that the skill of the second pull phase, including lower limb joint kinematics and barbell kinematics, is important for a successful heavy snatch lift.…”

Evaluación Técnica Del Clin Respecto a La Posición Corporal, Trayectoria Y Desplazamientos Verticales De La Barra, en Las Campeonas Nacionales De Levantamiento De Pesas 2013

“…El tiempo se midió desde el último momento en que la barra se encontraba en el suelo. El uso de videograbaciones es usual para definir las características biomecánicas externas del levantador de pesas y de la barra; ejemplos de esto son los trabajos de Isaka et al (1996); Shilling et al (2002); Okada et al (2008) y Musser (2010).…”

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“…Other authors (Korkman & Harbili, 2015;Hoover et al, 2006;Campos et al, 2006) have determined that absolute and relative indices of the barbell departure amplitude and squat depth decrease with weight gain. According to Japanese experts (Ikeda et al, 2012;Okada, et al, 2008) the difference between maximum amplitude of barbell departure and the amount of displacement in supporting squat phase should be minimal. At the same time Ho час et al, (2014) Gourgoulis et al, (2010) believe that the amplitude of barbell movement into supporting squat is influenced not as much as by the level of athlete's physical fitness, but as by their individual characteristics.…”