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Theses

Caractérisation et étude des vibrations dans la pratique sportive

Abstract : Running and various team sports generate transient vibrations in the soft tissues of the lower limb at each impact between the foot and the ground. These impacts and vibrations can generate significant mechanical stress, which increases the risk of overuse injury when not properly managed. The first objective of the thesis was devoted to the development of signal processing and statistical analysis methods to better characterize the impacts and vibrations encountered by athletes. The second objective was to define the external factors, such as practices, sports equipment, or neuromuscular fatigue, that modify the vibratory behavior in ecological practice. With the development of signal processing methods (continuous wavelet transform) and statistical methods (Statistical Parametric Mapping), we highlighted that soft tissue vibration was different from muscle vibration. Thus, accelerometers allow only a salient characterization of the muscle vibration compared to an ultrafast ultrasound. Besides, increasing running speed and sport specific tasks generated higher impact amplitude and frequency, as well as greater soft tissue vibration compared to in-line running. Among the sports equipment evaluated, only a sliding sports surface reduced the amplitude of the impact on the ground. An identification of the type of movement was made possible thanks to the measurement of the impacts and a convolutional neural network, allowing to cross the first step in the evaluation of the vibratory dose undergone by an athlete. Finally, a study carried out during the UTMB races put forward a strategy of protection of the neuromuscular system after trail-type efforts by decreasing the amplitude and the frequency of the vibrations of the most solicited muscles. It is now necessary to improve the characterization of muscle vibration with accelerometers fixed to the skin and to determine the effect of repetitive exposure to transient vibrations on the neuromuscular and musculoskeletal system.
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Submitted on : Tuesday, January 11, 2022 - 10:22:10 AM
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  • HAL Id : tel-03520594, version 1

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Robin Trama. Caractérisation et étude des vibrations dans la pratique sportive. Anatomie, Histologie, Anatomopathologie [q-bio.TO]. Université de Lyon, 2021. Français. ⟨NNT : 2021LYSE1128⟩. ⟨tel-03520594⟩

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