Introducing an Image Processing Method for Evaluation of Clean and Jerk Style in Weightlifting using Measured Biomechanical Parameters

Almasi, Mohammad

doi:10.5120/ijca2018917191

Cited by 2 publications

(2 citation statements)

References 7 publications

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“…[6][7][8][9] Angular kinematic features in weightlifting were also investigated by image processing method. 10 Rossi et al 11 simultaneously analyzed both ends of the barbell during weightlifting competitions and concluded that no significant differences were found for any kinematic parameters between right and left sides of the barbell during the snatch and clean. Sato et al 12 examined and validated a commercially available accelerometer which could be easily attached to barbell to get barbell's real-time acceleration, in comparison with kinematic data derived from video records of the barbell.…”

Section: Introductionmentioning

confidence: 99%

“…To obtain barbell's trajectory during the snatch, barbell's movement was captured on video by a high‐quality camera, in which the barbell was tracked by applying image processing technology such as pattern recognition 6‐9 . Angular kinematic features in weightlifting were also investigated by image processing method 10 . Rossi et al 11 simultaneously analyzed both ends of the barbell during weightlifting competitions and concluded that no significant differences were found for any kinematic parameters between right and left sides of the barbell during the snatch and clean.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic analysis and optimization of snatch lift based on barbell trajectory and on an anthropometric model comprised of six links

Jon,

Rim

2023

Engineering Reports

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Weightlifting requires explosive strength, high speed, and flexibility. The aim of this research is to present a method based on barbell trajectory and on an anthropometric model comprised of six links for dynamic analysis and optimization of snatch lift. First, snatch lift is divided into nine stages based on barbell trajectory, velocity, and acceleration, while evaluating dynamic characteristics. Then, an anthropometric model of weightlifter which is comprised of six segments: shin, thigh, trunk, upper arm, forearm, and head is developed. Since the head accounts for more or less than 10% of body weight, it should be considered as one link of one degree of freedom. Physical properties such as mass and center of mass of each link are not given by statistical data, but by anthropometry and calculation in Solidworks program. Finally, for barbell trajectory as one of the most important performance indices in weightlifting, an optimal control problem is formulated to minimize a criterion function defined as the sum of work done by lifter during snatch lift and solved by using Pontryagin Maximum Principle (PMP). The proposed method is illustrated with case study, showing results in good agreement with ones by analysis of lifter's actual performances. It can help coach or weightlifter to improve the snatch technique.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dynamic analysis and optimization of snatch lift based on barbell trajectory and on an anthropometric model comprised of six links

Jon,

Rim

2023

Engineering Reports

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Kinematic Analysis and Optimization of Jerk Considering Elasticity of Weightlifting Bar and Damping Effect of Body in Clean and Jerk

Jon,

Rim

2024

Engineering Reports

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The purpose of this study is kinematic analysis and optimization of jerk considering elasticity of the weightlifting bar and damping effect of the body. In order for weightlifters to achieve good technical skills in clean and jerk, the elasticity of weightlifting bar needs to be examined. First of all, barbell's trajectory, which leads to derivation of barbell's velocity and acceleration over time, is tracked by using image processing technology such as pattern recognition from video clip filmed the lifter's performance. Since the pull used during the clean is similar to the pull used during the snatch, the focus is set on examination of the jerk. Five kinematic characteristics—“Jerk‐Preparing‐Time,” “Jerk‐Drive‐Velocity,” “Jerk‐Time,” “Jerk‐Offset,” and “Jerk‐Drop” are newly introduced to evaluate the jerk technique. Then, a kinematic model which is comprised of springs and dashpots is proposed in order to simulate and optimize the jerk using elasticity of weightlifting bar. Spring constant and damping coefficient of the model is estimated by analyzing the barbell's oscillation on the shoulders. Besides, spring constant is calculated by theory of bending of beam, as well. Finally, an optimal control problem based on the proposed kinematic model is formulated to optimize the jerk. The methodology is illustrated with case study, showing good agreement with actual lifts. It could be useful for improving the jerk technique.

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Introducing an Image Processing Method for Evaluation of Clean and Jerk Style in Weightlifting using Measured Biomechanical Parameters

Cited by 2 publications

References 7 publications

Dynamic analysis and optimization of snatch lift based on barbell trajectory and on an anthropometric model comprised of six links

Dynamic analysis and optimization of snatch lift based on barbell trajectory and on an anthropometric model comprised of six links

Kinematic Analysis and Optimization of Jerk Considering Elasticity of Weightlifting Bar and Damping Effect of Body in Clean and Jerk

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