Department is School of Exercise Science, School of Exercise Science, ACU, Melbourne, Australia.
J Strength Cond Res. 2011 Oct;25(10):2773-80. doi: 10.1519/JSC.0b013e31820f500e.
This case study evaluated the importance of peak bar velocity and starting posture adopted by a novice weightlifter to the outcome of a Snatch lift. Multiple observations of both successful and unsuccessful attempts were captured using 3D motion analysis (VICON MX: 500 Hz). The following data analysis was then used to derive feedback. In total, 133 attempts of loads ranging from 75 to 100% of 1 repetition maximum (1RM) were performed by the subject (age = 25 years, stature = 171 cm, mass = 74.8 kg, Snatch 1RM = 80 kg). Variables included peak bar velocity, pelvis, hip, knee and ankle joint angles at the starting position for the right side and the difference between (left minus right) sides. No main effects for load, success, or their interactions were found for peak bar velocity. Starting position kinematics were mostly nonsignificant between the outcome of Snatch attempts. Right ankle joint angle was the only exception, where unsuccessful attempts displayed greater (p = 0.0228) dorsiflexion. A more comprehensive finding was achieved through the partition modeling; this analysis provided valuable insight and coaching feedback for the subject in relation to his lower body kinematics at the starting position. Furthermore, the accuracy of this feedback was verified using a holdback data set. Specifically, anterior pelvic tilt (>17.6°) and hip joint (<89.6°) angle were identified as the key features to increasing the likelihood of success. In conclusion, this case study outlines a method of data collection and analysis to assist coaching feedback for an individual.
本案例研究评估了新手举重运动员在抓举过程中达到的峰值杆速和起始姿势的重要性。使用 3D 运动分析（VICON MX：500Hz）对成功和失败的尝试进行了多次观察。然后使用以下数据分析得出反馈。总共对受试者（年龄=25 岁，身高=171cm，体重=74.8kg，抓举 1RM=80kg）进行了 133 次从 75%到 100%1 次重复最大值（1RM）的负荷尝试。变量包括峰值杆速、起始位置的骨盆、臀部、膝盖和脚踝关节角度，以及左右两侧之间的差异。在峰值杆速方面，没有发现负荷、成功或它们之间的相互作用的主要影响。在抓举尝试的结果之间，起始位置运动学大多不显著。右脚踝关节角度是唯一的例外，其中失败的尝试显示出更大的（p=0.0228）背屈。通过分区模型分析得出了更全面的发现；这一分析为受试者提供了有关其起始位置下肢运动学的宝贵见解和教练反馈。此外，使用保留数据集验证了此反馈的准确性。具体而言，确定了前骨盆倾斜（>17.6°）和髋关节角度（<89.6°）是增加成功可能性的关键特征。总之，本案例研究概述了一种用于收集和分析数据的方法，以协助为个人提供教练反馈。
