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Author: search.filters.author.Brahmia, Ameni

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    The activity and technique principle of football shooting are investigated from the viewpoint of nano-bio-mechanics
    (2025-03-18)
    Qiannan, Liu
    ;
    Yiqiao, Zhang
    ;
    HABIBI, MOSTAFA  
    ;
    Brahmia, Ameni
    ;
    Su, Yipng
    This research aims to investigate the effect of strength training on soccer ball shooting speed, comparing biomechanical characteristics. Some important biomechanical parameters, including the maximum angular velocity of the hip and knee joints, the maximum torque of the hip and knee joints in the forward movement and impact phases, and finally, the maximum ball speed, were selected for analysis. One-way analysis of variance with repeated measures and Tukey’s test showed a significant decrease in the maximum ball speed and the maximum angular speed of the knee joint between the first and fifth shots and subsequent shots. Compared to the first shoot, the hip joint’s maximum angular velocity, and torque significantly decreased from the sixth shot onwards. After five weeks of performing strength and flexibility exercises, a test was taken comparing two methods of strength and flexibility. Ultimately, the data were analyzed with correlated and uncorrelated t-student statistical methods. The results showed that the selected strength training program significantly affects shot range and dribble speed. Also, to increase the physical and mechanical resistance of soccer balls, nanotechnology has been used by the production of plastics with nanomaterials.
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    Exercise-induced changes in protein tissue stability in athletes via biomechanical analysis using size-dependent mechanical models
    (2025-05-25)
    Chaofan Chen
    ;
    Xiangzi Xiao
    ;
    HABIBI, MOSTAFA  
    ;
    Brahmia, Ameni
    Protein stability has been recognized as a critical factor influencing athletic performance, recovery, and injury prevention during physical exercise. Despite widespread recognition, the mechanisms by which exercise influences the stability of protein tissues and fibers remain incompletely understood. This study uses complex mechanical theories and numerical simulations to investigate how exercise impacts protein stability. Size-dependent mechanical models are employed to analyze the small-scale behavior of protein tissues under exercise-induced stress, including strain rate, tissue microstructure, and exercise intensity. Numerical approaches are used to simulate proteins’ dynamic behavior, offering insights into their deformation and failure processes under a wide range of situations. The results demonstrate that exercise substantially influences protein stability, with significant variations depending on the kind and intensity of the physical activity. These findings provide novel insights into the importance of protein stability in athletic performance and recovery, highlighting practical implications for training optimization, injury prevention, and broader applications in sports science. This study emphasizes the importance of protein stability for exercise and athletic performance by integrating biomechanics and sports science.
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    Wave propagation response of porous vibrating sports equipment under thermal loading application on testing athlete performance
    (2025-04-25)
    Yajie, Zhang
    ;
    Wang, Meng
    ;
    HABIBI, MOSTAFA  
    ;
    Zhiqiang, Song
    ;
    Brahmia, Ameni
    The horizontal bar is a staple of men’s gymnastics which allows athletes to perform spectacular routines such as swings, releases, and complex dismounts. This bar must endure significant vibrations and stress when the gymnast stands about 3 meters above the ground. This study proposes replacing traditional horizontal bars with lightweight and porous metal foam cylinders that are able to handle mechanical and thermal challenges. Three porosity patterns namely Uniform Porosity Pattern (UPP), Symmetric PP (SPP), and asymmetric (APP) are explored here to examine their effect on the above-mentioned metal foam. Also, the behavior of these bars under various thermal and material conditions is studied through the first-order shear deformation theory and Hamilton’s principle. The results indicate how porosity, thickness, and thermal condition would influence the bar’s wave frequency and velocity. For instance, the findings show that higher temperatures, radius to thickness ratio and porosity would decrease wave frequencies. Moreover, wave number has positive effect on values of wave frequency and phase velocity. Additionally, these outcomes prove the potential of metal foams in more efficient designs in sports equipment.