Our study was designed to check the reliability of force–velocity (F-v) relationship outcome measures using flywheel (FW) squats. The main objectives at the primary level were to test intra-session reliability of mechanical parameters for ten equidistant FW loads, and at the secondary level, to test reliability and validity of the F-v relationship outcome measures in case any possible reduction in used loads and number of loads – compared to the 10-load method as a reference – is administered. Twenty-six subjects performed two sets of five squats with FW loads in the range 0.025–0.25 kg∙m². Averaging six consecutive repetitions obtained ICC_2.k > 0.9 for mean force and mean velocity results. Consecutively averaged parameters at the primary level showed excellent inter-set reliability (ICC_2.1 > 0.9). The inverse F-v relationship was strong (R² = 0.96). At the secondary level, Bland-Altman statistics showed decreasing bias and limits of agreement in combination with more loads. Theoretical maximal force and power showed smaller bias as F-v slope and theoretical maximal velocity for three loads or more. Four loads (0.025, 0.075, 0.225 and 0.25 kg∙m²) lowered bias to a 5% in relation to the reference F-v slope. In conclusion, six repetitions are required to obtain trustworthy force and velocity results. The results will contribute to standardising the methodology for assessing the mechanical capacities of leg muscles using FW resistance. Moreover, assessing individual F-v profile with reduced protocol may be a less fatiguing tool for prescribing exercise intensity and for assessing training adaptations.

我们的研究旨在检查使用飞轮（FW）深蹲的力-速度（ Fv ）关系结果测量的可靠性。初级阶段的主要目标是测试 10 个等距 FW 负载的机械参数的会话内可靠性，而次级阶段的主要目标是测试Fv关系结果测量的可靠性和有效性，以防使用负载和数量可能减少。负载的管理——与作为参考的 10 负载方法相比。 26 名受试者进行了两组，每组 5 次深蹲，FW 负荷范围为 0.025–0.25 kg∙m ² 。平均六次连续重复获得平均力和平均速度结果的 ICC _2.k > 0.9。初级水平的连续平均参数显示出出色的组间可靠性（ICC _2.1 > 0.9）。 F -v 反比关系很强 (R ² = 0.96)。在中学阶段，布兰德-奥尔特曼统计数据显示，随着负荷的增加，偏差和一致性限制正在减少。对于三个或更多负载，理论最大力和功率显示出较小的Fv斜率和理论最大速度偏差。四种载荷（0.025、0.075、0.225 和 0.25 kg∙m ² ）将相对于参考Fv斜率的偏差降低至 5%。总之，需要重复六次才能获得可靠的力和速度结果。研究结果将有助于标准化使用 FW 阻力评估腿部肌肉机械能力的方法。此外，通过简化的方案评估个人Fv曲线可能是一种减少疲劳的工具，可用于规定运动强度和评估训练适应性。