Department of Health and Exercise Science, University of Oklahoma, Norman, Oklahoma.
J Strength Cond Res. 2020 Feb;34(2):440-444. doi: 10.1519/JSC.0000000000002817.
Miller, RM, Freitas, EDS, Heishman, AD, Koziol, KJ, Galletti, BAR, Kaur, J, and Bemben, MG. Test-retest reliability between free weight and machine-based movement velocities. J Strength Cond Res 34(2): 440-444, 2020-Several devices are available to measure muscular power through velocity measurement, including the Tendo FitroDyne. The ability for such devices to produce consistent results is still questioned, and the reproducibility of measurement between free weight and machine exercise has yet to be examined. Therefore, the aim of this investigation was to determine the test-retest reliability for barbell velocity during the bench press (BP) and weight velocity during the 2 leg press (2LP) for loads corresponding to 20-80% of 1 repetition maximum (1RM). Forty recreationally active individuals (22.6 ± 2.5 years; 175.9 ± 10.8 cm; and 76.2 ± 13.2 kg) with a 1RM BP and 2LP of 66.8 ± 32.4 kg and 189.5 ± 49 kg, respectively, volunteered for this study. Subjects completed 1 familiarization visit preceding 3 testing visits, which encompassed 1RM determination and 2 days of velocity testing. Forty-eight hours after 1RM testing, the subjects performed 1 repetition at 20, 30, 40, 50, 60, 70, and 80% of their 1RM for each exercise in randomized order. Subjects returned to the laboratory 1 week later to perform the velocity assessment again in randomized order. Intraclass correlation coefficient (ICC2,1) and relative SEM for the BP and 2LP ranged from 0.56 to 0.98 (3-18.1%) and 0.78 to 0.98 (2.8-7.2%), respectively, and no mean differences were observed between trials. The results suggest high reliability for BP velocity between 30 and 60% 1RM and moderate reliability at 20, 70, and 80% 1RM, while the 2LP displayed high to excellent reliability from 20 to 80% 1RM. Cumulatively, machine-based exercise displayed greater reproducibility; however, additional machine exercises need to be examined to bolster this conclusion.
米勒、弗雷塔斯、希斯曼、科齐奥尔、加莱蒂、考尔、本本，杠铃和器械运动速度的重测信度。J 力量与 Conditioning 研究 34(2):440-444，2020-有几种设备可通过速度测量来测量肌肉力量，包括 Tendo FitroDyne。这些设备能否产生一致的结果仍存在疑问，而且自由重量和器械运动之间的测量重现性尚未得到检验。因此，本研究的目的是确定在卧推（BP）中杠铃速度和腿推（2LP）中重量速度的重测信度，负荷对应于 1 重复最大（1RM）的 20-80%。40 名从事休闲活动的个体（22.6±2.5 岁；175.9±10.8cm；76.2±13.2kg），BP 的 1RM 为 66.8±32.4kg，2LP 的 1RM 为 189.5±49kg，自愿参加本研究。受试者在进行 1 次熟悉访问后，进行了 3 次测试访问，包括 1RM 测试和 2 天的速度测试。在 1RM 测试后 48 小时，受试者以随机顺序在每个练习中以 20%、30%、40%、50%、60%、70%和 80%的 1RM 重复 1 次。一周后，受试者返回实验室以随机顺序再次进行速度评估。BP 和 2LP 的组内相关系数（ICC2,1）和相对 SEM 分别为 0.56-0.98（3-18.1%）和 0.78-0.98（2.8-7.2%），并且在试验之间未观察到平均差异。结果表明，BP 速度在 30%至 60%1RM 之间具有高度可靠性，在 20%、70%和 80%1RM 之间具有中度可靠性，而 2LP 在 20%至 80%1RM 之间显示出高度至极好的可靠性。总的来说，基于机器的运动显示出更高的可重复性；然而，需要进一步检查其他机器练习来支持这一结论。
