School of Sport, Health and Community, University of Winchester, Winchester SO22 4NR, UK.
Chichester Institute of Sport, University of Chichester, Chichester PO19 6PE, UK.
Sensors (Basel). 2022 Jun 9;22(12):4371. doi: 10.3390/s22124371.
The aim of this study was to assess the validity of electro-goniometers as a tool for recording continuous relative phase data at two joint couplings during cycling tasks at a range of cadences. Seven participants (4 male, 3 female, age: 29 ± 7 years, height: 1.76 ± 0.10 m, mass: 71.97 ± 11.57 kg) performed exercise bouts of 30 s at four prescribed cadences (60, 80, 100, 120 rev·min) on a stationary ergometer (Wattbike, Nottingham, UK). Measures were synchronously recorded by bi-axial electro-goniometers (Biometrics, UK) and a 12-camera motion-capture system (Qualisys, Gothenburg, Sweden), with both systems sampling at 500 Hz. Sagittal plane joint angle and joint angular velocity were recorded at the hip, knee and ankle and analysed for ten complete pedal revolutions per participant per condition. Data were interpolated to 100 time points and used to calculate mean continuous relative phase (CRP) per pedal revolution at two intra-limb couplings: (i) knee flexion/extension-ankle plantarflexion/dorsiflexion (KA) and (ii) hip flexion/extension-knee flexion/extension (HK). At the KA coupling, significant differences in mean CRP were found between measurement systems at 120 rev·min ( = 0.006). At the HK coupling, significant differences in mean CRP were found between measurement systems at 80 rev·min ( = 0.043) and 100 rev·min ( = 0.028). ICC values for most comparisons were below 0.5, suggesting poor levels of agreement between systems. Significant differences in mean CRP per pedal revolution and poor levels of agreement between systems suggests that electro-goniometers are not a suitable alternative to motion-capture systems when attempting to record CRP during cycling.
本研究旨在评估电子量角器作为一种工具，在不同转速下记录连续相对相位数据在两个关节耦合的有效性。七名参与者（4 名男性，3 名女性，年龄：29 ± 7 岁，身高：1.76 ± 0.10 m，体重：71.97 ± 11.57 kg）在固定测功计（英国诺丁汉的 Wattbike）上进行 30 s 的运动。在四个规定的转速（60、80、100、120 rev·min）下，参与者完成了 30 s 的运动。双轴电子量角器（Biometrics，英国）和 12 摄像机运动捕捉系统（瑞典哥德堡的 Qualisys）同步记录测量值，两个系统的采样频率均为 500 Hz。记录了参与者在每个条件下每十次完整蹬踏时的矢状面关节角度和关节角速度。数据被内插到 100 个时间点，并用于计算每个踏板转十圈时的两个肢体间关节的平均连续相对相位（CRP）：（i）膝关节屈伸-踝关节跖屈/背屈（KA）和（ii）髋关节屈伸-膝关节屈伸（HK）。在 KA 耦合中，在 120 rev·min 时，测量系统之间的平均 CRP 存在显著差异（ = 0.006）。在 HK 耦合中，在 80 rev·min（ = 0.043）和 100 rev·min（ = 0.028）时，测量系统之间的平均 CRP 存在显著差异。大多数比较的 ICC 值低于 0.5，表明系统之间的一致性水平较差。每个踏板转的平均 CRP 存在显著差异，系统之间的一致性水平较差，这表明在尝试记录自行车运动中的 CRP 时，电子量角器不是运动捕捉系统的合适替代品。
