Poulet Yoann, Brassart Florian, Simonetti Emeline, Pillet Hélène, Faupin Arnaud, Sauret Christophe
Centre d'Études et de Recherche sur l'Appareillage des Handicapés, Institution Nationale des Invalides, 75007 Paris, France.
Arts et Métiers Institute of Technology, Université Sorbonne Paris Nord, IBHGC-Institut de Biomécanique Humaine Georges Charpak, HESAM Université, 151 Bd de l'Hôpital, 75013 Paris, France.
Sensors (Basel). 2022 Dec 21;23(1):58. doi: 10.3390/s23010058.
The analysis of intra-cycle velocity profile of manual wheelchair (MWC) users has been used to highlight the significant role of trunk inertia in propulsion biomechanics. Maximal wheelchair linear velocity has previously been observed to be reached after the release of the handrims both during sports activities and daily life propulsion. This paper provides a combined analysis of linear velocity and trunk kinematics in elite wheelchair racing athletes during straight-line propulsion at stabilized speeds. MWC and trunk kinematics of eight athletes (level: 7 elite, 1 intermediate; classification: T54 (5), T53 (2) and T52 (1)) were monitored during 400 m races using inertial measurement units. An average propulsion cycle was computed for each athlete. The main finding of this article is the difference in propulsion patterns among the athletes, exhibiting either 1, 2 or 3 peaks in their velocity profile. A second peak in velocity is usually assumed to be caused by the inertia of the trunk. However, the presence of a second velocity peak among more severely impaired athletes with little to no trunk motion can either be associated to the inertia of the athletes' arms or to their propulsion technique.
对手动轮椅（MWC）使用者的周期内速度剖面分析，已被用于突出躯干惯性在推进生物力学中的重要作用。此前在体育活动和日常生活推进过程中，均观察到在松开手轮圈后达到最大轮椅线速度。本文对精英轮椅竞速运动员在稳定速度下直线推进过程中的线速度和躯干运动学进行了综合分析。在400米比赛期间，使用惯性测量单元对八名运动员（水平：7名精英、1名中级；分类：T54（5名）、T53（2名）和T52（1名））的MWC和躯干运动学进行了监测。为每位运动员计算了平均推进周期。本文的主要发现是运动员之间推进模式的差异，其速度剖面呈现出1个、2个或3个峰值。速度的第二个峰值通常被认为是由躯干的惯性引起的。然而，在几乎没有或没有躯干运动的重度受损运动员中，第二个速度峰值的出现，可能与运动员手臂的惯性或其推进技术有关。
