The aims of the study were (i) to determine the reliability and concurrent validity of a functional electromechanical dynamometer (FEMD) to measure different isokinetic velocities, and (ii) to identify the real range of isokinetic velocity reached by FEMD for different prescribed velocities. Mean velocities were collected simultaneously with FEMD and a linear velocity transducer (LVT) in two sessions that were identical, consisting of 15 trials at five isokinetic velocities (0.40, 0.60, 0.80, 1.00, and 1.20 m·s⁻¹) over a range of movement of 40 cm. The results obtained using each method were compared using Paired samples t-tests, Bland-Altman plots and the Pearson’s product–moment correlation coefficient, while the reliability was determined using the standard error of measurement and coefficient of variation (CV). The results indicate that the mean velocity values collected with FEMD and LVT were practically perfect correlations (r > 0.99) with low random errors (<0.06 m·s⁻¹), while mean velocity values were systematically higher for FEMD (p < 0.05). FEMD provided a high or acceptable reliability for mean velocity (CV ≤ 0.24%), time to reach the isokinetic velocity (CV range = 1.68%–9.70%) and time spent at the isokinetic velocity (CV range = 0.53%–8.94%). These results suggest that FEMD offers valid and reliable measurements of mean velocity during a fixed linear movement, as well as a consistent duration of the isokinetic phase. FEMD could be an appropriate device to evaluate movement velocity during linear movements. More studies are needed to confirm the reliability and validity of FEMD to measure different velocity metrics during more complex functional exercises.

该研究的目的是（i）确定用于测量不同等速运动的功能的电动测功机（FEMD）的可靠性和同时有效性，以及（ii）确定FEMD针对不同的规定速度达到的等速运动的真实范围。在两个相同的阶段中，同时使用FEMD和线速度传感器（LVT）同时收集平均速度，包括在一定范围内以五个等速（0.40、0.60、0.80、1.00和1.20 m·s ^-1）进行的15次试验运动的40厘米。使用配对样本t比较每种方法获得的结果检验，Bland-Altman图和Pearson的乘积矩相关系数，而可靠性是使用测量的标准误差和变异系数（CV）确定的。结果表明，用FEMD和LVT收集的平均速度值几乎是完美的相关性（r  > 0.99），随机误差低（<0.06 m·s ^-1），而FEMD的平均速度值系统地较高（p <0.05）。FEMD对平均速度（CV≤0.24％），达到等速运动的时间（CV范围= 1.68％–9.70％）和等速运动所花费的时间（CV范围= 0.53％–8.94％）提供了高度或可接受的可靠性。 。这些结果表明，FEMD可在固定的线性运动期间以及等速运动阶段的持续时间提供有效且可靠的平均速度测量。FEMD可能是评估线性运动过程中运动速度的合适设备。需要进行更多的研究来确认FEMD在更复杂的功能练习中测量不同速度指标的可靠性和有效性。