Winchester Jason B, Porter Jared M, McBride Jeffrey M
School of Recreation, Health, and Tourism, George Mason University, Manassas, Virginia, USA.
J Strength Cond Res. 2009 Mar;23(2):444-54. doi: 10.1519/JSC.0b013e318198fc73.
This study investigated kinematic and kinetic variable changes in the power snatch (PS) after 4 weeks of training and the use of summary feedback. Twenty-four collegiate football players participated as subjects in this study. The subjects were pretested for their 1-repetition maximum (1RM) and were separated into feedback (FG; n = 12) and control (CG; n = 12) groups. The FG was provided with augmented feedback (AF) during power snatch training sessions, which took place 3 times per week for 4 weeks. The AF is defined as information that is received in addition to what is naturally available. Variables measured include peak force (PF), peak power (PP), and several kinematic variables at 50, 70, and 90% of the subjects' pre-1RM. The PF was improved at 50% 1RM from 567 +/- 202 to 769 +/- 230 N, at 70% from 725 +/- 186 to 890 +/- 199 N, and at 90% from 822 +/- 197 to 1008 +/- 201 N in the FG (p <or= 0.05). The PP was increased at 50% 1RM from 2061 +/- 562 to 2538 +/- 498 W, at 70% from 2321 +/- 743 to 2754 +/- 629 W, and at 90% from 2076 +/- 437 to 2491 +/- 526 W in the FG (p <or= 0.05). Variables with respect to bar path kinematics improved significantly. No improvements in kinetics or kinematics were noted in the CG. These results indicate that both kinematic and kinetic variables improve through training and AF. Practitioners wishing to improve weightlifting performance should attempt to use evidence-based AF.
本研究调查了经过4周训练以及使用总结性反馈后，高翻（PS）动作中运动学和动力学变量的变化。24名大学橄榄球运动员作为受试者参与了本研究。对受试者进行了1次重复最大值（1RM）的预测试，并将他们分为反馈组（FG；n = 12）和对照组（CG；n = 12）。在每周进行3次、为期4周的高翻训练课程中，向FG组提供增强反馈（AF）。AF被定义为除自然可得信息之外所接收的信息。测量的变量包括峰值力（PF）、峰值功率（PP）以及在受试者1RM前测值的50%、70%和90%时的几个运动学变量。在FG组中，PF在1RM的50%时从567±202 N提高到769±230 N，在70%时从725±186 N提高到890±199 N，在90%时从822±197 N提高到1008±201 N（p≤0.05）。PP在1RM的50%时从2061±562 W增加到2538±498 W，在70%时从2321±743 W增加到2754±629 W，在90%时从2076±437 W增加到2491±526 W（p≤0.05）。与杠铃路径运动学相关的变量有显著改善。CG组在动力学或运动学方面未观察到改善。这些结果表明，运动学和动力学变量均可通过训练和AF得到改善。希望提高举重成绩的从业者应尝试使用基于证据的AF。
