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A Comparison of Static and Dynamic Measures of Lower Limb Joint Angles in Cycling: Application to Bicycle Fitting

机译:下肢关节角度静态和动态测量的比较:在自行车配件中的应用

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Purpose. Configuration of bicycle components to the cyclist (bicycle fitting) commonly uses static poses of the cyclist on the bicycle at the 6 o’clock crank position to represent dynamic cycling positions. However, the validity of this approach and the potential use of the different crank position (e.g. 3 o’clock) have not been fully explored. Therefore, this study compared lower limb joint angles of cyclists in static poses (3 and 6 o’clock) compared to dynamic cycling. Methods. Using a digital camera, right sagittal plane images were taken of thirty cyclists seated on their own bicycles mounted on a stationary trainer with the crank at 3 o’clock and 6 o’clock positions. Video was then recorded during pedalling at a self-selected gear ratio and pedalling cadence. Sagittal plane hip, knee and ankle angles were digitised. Results. Differences between static and dynamic angles were large at the 6 o’clock crank position with greater mean hip angle (4.9 ± 3°), smaller knee angle (8.2 ± 5°) and smaller ankle angle (8.2 ± 5.3°) for static angles. Differences between static and dynamic angles (
机译:目的。将自行车部件配置为骑车人(自行车配件)通常使用骑自行车者在6点钟曲柄位置处的静态姿势来表示动态骑车位置。但是,这种方法的有效性以及不同曲柄位置(例如3点钟)的潜在用途尚未得到充分研究。因此,本研究比较了静态姿势(3点钟和6点钟)和动态脚踏车的下肢关节角度。方法。使用数码相机拍摄了三十位骑车人的右矢状面图像,他们骑着自己的自行车安装在固定的教练机上,曲柄分别位于3点钟和6点钟位置。然后在踩踏过程中以自行选择的齿轮比和踩踏节奏记录视频。将矢状面的髋,膝和踝角数字化。结果。静态角度和动态角度之间的差异在6点钟曲柄位置处较大,对于静态角度,平均臀部角度(4.9±3°),膝盖角度(8.2±5°)和踝角度(8.2±5.3°)较大。静态和动态角度之间的差异(

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