Grgic Jozo, Scapec Bela, Pedisic Zeljko, Mikulic Pavle
Institute for Health and Sport (IHES), Victoria University, Melbourne, VIC, Australia.
Faculty of Kinesiology, University of Zagreb, Zagreb, Croatia.
Front Physiol. 2020 Sep 9;11:561682. doi: 10.3389/fphys.2020.561682. eCollection 2020.
We explored the test-retest reliability of velocity and power assessed by the GymAware PowerTool system (GYM) in the deadlift and squat by simulating a context with and without a familiarization session. Sixteen resistance-trained individuals completed three testing sessions. In all sessions, velocity and power were assessed by the GYM system in the deadlift and squat exercises with loads of 30, 45, 60, 75, and 90% of one-repetition maximum. The consistency of test results between the first session and the second session was considered to represent the reliability with no familiarization session. The consistency of test results between the second session and the third session was considered to represent the reliability with one familiarization session because the first session simulates a familiarization session. Intraclass correlation coefficients (ICCs) ranged 0.63-0.99 in the deadlift, and 0.78-0.99 in the squat. ICCs were higher than 0.75 for 93 and 100% of all deadlift and squat tests, respectively. For velocity and power, standard error of measurement ranged 0.03-0.08 m/s and 20-176 W, respectively. The coefficient of variation ranged 2.2-10.6% for the deadlift and 2.6-6.9% for the squat tests. Except for peak and mean velocity at 30% of 1RM in the squat, we found no significant improvements in reliability with a familiarization session. The test-retest reliability of velocity and power assessed by the GYM system was moderate-to-excellent for the deadlift and good-to-excellent for the squat. Reliability of velocity and power did not seem to improve with a familiarization session.
我们通过模拟有无熟悉阶段的情境，探讨了GymAware PowerTool系统（GYM）评估的硬拉和深蹲中速度与功率的重测信度。16名进行过抗阻训练的个体完成了三次测试。在所有测试中，GYM系统在硬拉和深蹲练习中，使用1次重复最大值的30%、45%、60%、75%和90%的负荷来评估速度和功率。第一次测试与第二次测试结果的一致性被视为无熟悉阶段时的信度。第二次测试与第三次测试结果的一致性被视为有一次熟悉阶段时的信度，因为第一次测试模拟了熟悉阶段。组内相关系数（ICC）在硬拉中为0.63 - 0.99，在深蹲中为0.78 - 0.99。在所有硬拉和深蹲测试中，分别有93%和100%的ICC高于0.75。对于速度和功率，测量标准误分别为0.03 - 0.08 m/s和20 - 176 W。硬拉测试的变异系数为2.2 - 10.6%，深蹲测试为2.6 - 6.9%。除了深蹲中1RM的30%时的峰值和平均速度外，我们发现熟悉阶段并未显著提高信度。GYM系统评估的速度和功率的重测信度在硬拉中为中等至优秀，在深蹲中为良好至优秀。速度和功率的信度似乎并未因熟悉阶段而提高。
