Université de Technologie de Compiègne, UMR CNRS 7338 BioMécanique et BioIngénierie, Alliance Sorbonne Université, 60200 Compiègne, France.
Ecole Nationale Vétérinaire d'Alfort, USC INRAE-ENVA 957 BPLC, CWD-VetLab, 94700 Maisons-Alfort, France.
Sensors (Basel). 2021 May 30;21(11):3792. doi: 10.3390/s21113792.
The protraction and retraction angles of horse limbs are important in the analysis of horse locomotion. This study explored two methods from an IMU positioned on the canon bone of eight horses to estimate these angles. Each method was based on a hypothesis in order to define the moment corresponding with the verticality of the canon bone: (i) the canon bone is in a vertical position at 50% of the stance phase or (ii) the verticality of the canon bone corresponds with the moment when the horse's withers reach their lowest point. The measurements were carried out on a treadmill at a trot and compared with a standard gold method based on motion capture. For the measurement of the maximum protraction and retraction angles, method (i) had average biases (0.7° and 1.7°) less than method (ii) (-1.3° and 3.7°). For the measurement of the protraction and retraction angles during the stance phase, method (i) had average biases (4.1° and -3.3°) higher to method (ii) (2.1° and -1.3°). This study investigated the pros and cons of a generic method (i) vs. a specific method (ii) to determine the protraction and retraction angles of horse limbs by a single IMU.
马四肢的伸展和收缩角度在分析马的运动中很重要。本研究探讨了两种从安装在马的 canon 骨上的 IMU 估计这些角度的方法。每种方法都是基于一个假设来定义与 canon 骨垂直对应的时刻：(i) canon 骨在站立阶段的 50%时处于垂直位置，或 (ii) canon 骨的垂直位置与马的肩隆最低点对应的时刻相对应。这些测量是在跑步机上以小跑进行的，并与基于运动捕捉的标准黄金方法进行了比较。对于最大伸展和收缩角度的测量，方法 (i) 的平均偏差（0.7° 和 1.7°）小于方法 (ii) 的平均偏差（-1.3° 和 3.7°）。对于站立阶段的伸展和收缩角度的测量，方法 (i) 的平均偏差（4.1° 和-3.3°）高于方法 (ii) 的平均偏差（2.1° 和-1.3°）。本研究调查了通用方法 (i) 与特定方法 (ii) 的优缺点，以通过单个 IMU 确定马四肢的伸展和收缩角度。
