Illera-Domínguez Víctor, Fernández-Valdés Bruno, Gisbert-Orozco Jose, Ramirez-Lopez Carlos, Nuell Sergi, González Jacob, Weakley Jonathon
Institut Nacional d'Educació Física de Catalunya (INEFC), Universitat de Barcelona, Barcelona, Spain.
Tecnocampus, Department of Health Sciences, Pompeu Fabra University, Mataró, Spain.
Biol Sport. 2023 Jul;40(3):805-811. doi: 10.5114/biolsport.2023.119991. Epub 2022 Nov 18.
The purpose of this study was to investigate the validity of a low-cost friction encoder against a criterion measure (strain gauge combined with a linear encoder) for assessing velocity, force and power in flywheel exercise devices. Ten young and physically active volunteers performed two sets of 14 maximal squats on a flywheel inertial device (YoYo Technology, Stockholm, Sweden) with five minutes rest between each set. Two different resistances were used (0.075 kg · m for the first set; 0.025 kg · m for the second). Mean velocity (V), force (F) and power (P) for each repetition were assessed simultaneously via a friction encoder (Chronojump, Barcelona, Spain), and with a strain gauge combined with a linear encoder (MuscleLab 6000, Ergotest Technology, Porsgrunn, Norway). Results are displayed as (Mean [CI 90%]). Compared to criterion measures, mean bias for the practical measures of V, F and P were moderate (-0.95 [-0.99 to -0.92]), small (0.53 [0.50 to 0.56]) and moderate (-0.68 [-0.71 to -0.65]) respectively. The typical error of estimate (TEE) was small for all three parameters; V (0.23 [0.20 to 0.25]), F (0.20 [0.18 to 0.22]) and P (0.18 [0.16 to 0.20]). Correlations with MuscleLab were nearly perfect for all measures in all load configurations. Based on these findings, the friction encoder provides valid measures of velocity, force and power in flywheel exercise devices. However, as error did exist between measures, the same testing protocol should be used when assessing changes in these parameters over time, or when aiming to perform inter-individual comparisons.
本研究的目的是针对一种低成本摩擦编码器，对照一种用于评估飞轮运动器械中速度、力量和功率的标准测量方法（应变片与线性编码器相结合），调查其有效性。十名年轻且身体活跃的志愿者在一个飞轮惯性装置（YoYo Technology，瑞典斯德哥尔摩）上进行两组每组14次的最大深蹲，每组之间休息五分钟。使用了两种不同的阻力（第一组为0.075 kg·m；第二组为0.025 kg·m）。通过一个摩擦编码器（Chronojump，西班牙巴塞罗那）以及一个应变片与线性编码器相结合的装置（MuscleLab 6000，挪威波什格伦的Ergotest Technology），同时评估每次重复动作的平均速度（V）、力量（F）和功率（P）。结果以（均值[90%置信区间]）表示。与标准测量方法相比，V、F和P实际测量值的平均偏差分别为中等（-0.95[-0.99至-0.92]）、较小（0.53[0.50至0.56]）和中等（-0.68[-0.71至-0.65]）。所有三个参数的估计典型误差（TEE）都较小；V为（0.23[0.20至0.25]），F为（0.20[0.18至0.22]），P为（0.18[0.16至0.20]）。在所有负荷配置下，所有测量值与MuscleLab的相关性几乎都是完美的。基于这些发现，摩擦编码器能够有效测量飞轮运动器械中的速度、力量和功率。然而，由于测量之间确实存在误差，在评估这些参数随时间的变化时，或者在进行个体间比较时，应使用相同的测试方案。
