The aim of this study was to examine the test-retest reliability and concurrent validity of the PUSH Band™ 2.0 to measure barbell’s velocity during unconstrained (free-weights) and constrained (Smith machine) squat exercises. After an initial assessment of the Smith machine squat one-repetition maximum (1RM), 24 resistance-trained males completed one or two testing sessions separated by 7 days. In one session, the squat was performed with free-weights (n = 22), while in another session, the Smith machine was used (n = 16). Both testing sessions consisted of two blocks of eight repetitions (three repetitions at 45%1RM, three repetitions at 65%1RM, and two repetitions at 85%1RM). The mean velocity of the lifting phase was simultaneously recorded with the PUSH Band™ 2.0 and a gold-standard linear velocity transducer (T-Force^® System). The PUSH Band™ 2.0 generally revealed an acceptable reliability (CV_range = 5.81%–13.14%), but the reliability was always greater for the T-Force^® System (CV_range = 2.95%–7.86%). Regardless of the squat exercise, the concurrent validity of the PUSH Band™ 2.0 with respect to the T-Force^® System was generally low at 45%1RM (ES_range = 0.18–0.33; r_range = 0.58–0.75; SEE_range = 0.04–0.05 ms⁻¹ and 4.2%–6.0%), 65%1RM (ES_range = 0.26–0.44; r_range = 0.63–0.82; SEE_range = 0.04–0.06 ms⁻¹ and 6.0%–9.2%), and 85%1RM (ES_range = 0.61–0.64; r_range = 0.66–0.82; SEE_range = 0.05–0.07 ms⁻¹ and 11.4%–16.0%). Taken together, these results suggest that the PUSH Band™ 2.0 is a reliable, but not valid, wearable technology to measure the barbell velocity during the free-weight and Smith machine squat exercises.

本研究的目的是检验 PUSH Band™ 2.0 在无约束（自由重量）和有约束（史密斯机）深蹲练习中测量杠铃速度的重测信度和同时效度。在对史密斯机蹲最大重复次数 (1RM) 进行初步评估后，24 名接受过阻力训练的男性完成了相隔 7 天的一两个测试阶段。在一次训练中，深蹲使用自由重量（n  = 22），而在另一次训练中，使用史密斯机（n = 16）。两个测试阶段都由两块八次重复组成（45%1RM 的 3 次重复，65%1RM 的 3 次重复，85%1RM 的两次重复）。使用 PUSH Band™ 2.0 和金标准线速度传感器（T-Force ^®系统）同时记录提升阶段的平均速度。PUSH Band™ 2.0 通常显示出可接受的可靠性（CV_范围 = 5.81%–13.14%），但 T-Force ^®系统的可靠性始终更高（CV_范围 = 2.95%–7.86%）。无论进行何种深蹲练习，PUSH Band™ 2.0 相对于 T-Force ^®系统的同时有效性通常较低，为 45%1RM（ES_范围 = 0.18–0.33；r_范围 = 0.58–0.75；SEE_范围 = 0.04–0.05 ms ^-1和 4.2%–6.0%)，65%1RM（ES_范围 = 0.26–0.44；r_范围 = 0.63–0.82；SEE_范围 = 0.04–0.06 ms ^-1和 6.0%–9.2% ) 和 85%1RM（ES_范围 = 0.61–0.64；r_范围 = 0.66–0.82；SEE_范围 = 0.05–0.07 ms ^-1和 11.4%–16.0%）。综上所述，这些结果表明 PUSH Band™ 2.0 是一种可靠但无效的可穿戴技术，可用于在自由重量和史密斯机深蹲练习期间测量杠铃速度。