Department of Technical Services, Manchester Metropolitan University, Manchester, United Kingdom.
Department of Sport and Physical Activity, Edge Hill University, Ormskirk, United Kingdom.
J Strength Cond Res. 2018 Jun;32(6):1571-1582. doi: 10.1519/JSC.0000000000002572.
Chandler, PT, Greig, M, Comfort, P, and McMahon, JJ. Variability of plyometric and ballistic exercise technique maintains jump performance. J Strength Cond Res 32(6): 1571-1582, 2018-The aim of this study was to investigate changes in vertical jump technique over the course of a training session. Twelve plyometric and ballistic exercise-trained male athletes (age = 23.4 ± 4.6 years, body mass = 78.7 ± 18.8 kg, height = 177.1 ± 9.0 cm) performed 3 sets of 10 repetitions of drop jump (DJ), rebound jump (RJ) and squat jump (SJ). Each exercise was analyzed from touchdown to peak joint flexion and peak joint flexion to take-off. Squat jump was analyzed from peak joint flexion to take-off only. Jump height, flexion and extension time and range of motion, and instantaneous angles of the ankle, knee, and hip joints were measured. Separate 1-way repeated analyses of variance compared vertical jump technique across exercise sets and repetitions. Exercise set analysis found that SJ had lower results than DJ and RJ for the angle at peak joint flexion for the hip, knee, and ankle joints and take-off angle of the hip joint. Exercise repetition analysis found that the ankle joint had variable differences for the angle at take-off, flexion, and extension time for RJ. The knee joint had variable differences for flexion time for DJ and angle at take-off and touchdown for RJ. There was no difference in jump height. Variation in measured parameters across repetitions highlights variable technique across plyometric and ballistic exercises. This did not affect jump performance, but likely maintained jump performance by overcoming constraints (e.g., level of rate coding).
钱德勒，PT，格雷格，M，康福特，P，和麦克马洪，JJ。增强式和弹振式练习技术的可变性保持跳跃表现。J 力量与调理研究 32（6）：1571-1582，2018-本研究旨在调查训练过程中垂直跳跃技术的变化。12 名增强式和弹振式运动训练的男性运动员（年龄=23.4±4.6 岁，体重=78.7±18.8 千克，身高=177.1±9.0 厘米）完成了 3 组 10 次的跳深（DJ）、反跳（RJ）和深蹲跳（SJ）。每个练习都是从触地到最大关节屈曲和最大关节屈曲到起跳进行分析。深蹲跳只从最大关节屈曲到起跳进行分析。测量跳跃高度、屈伸时间和运动范围，以及踝关节、膝关节和髋关节的瞬时角度。使用单向重复方差分析比较了各练习组和重复次数的垂直跳跃技术。练习组分析发现，与 DJ 和 RJ 相比，SJ 的髋关节、膝关节和踝关节的最大关节屈曲角度和髋关节的起跳角度较低。练习重复分析发现，RJ 的踝关节起跳角度、屈伸时间有变化，膝关节 DJ 的屈伸时间和起跳角度、RJ 的触地角度有变化。跳跃高度没有差异。各重复次数测量参数的差异突出了增强式和弹振式练习中技术的可变性。这并未影响跳跃表现，但可能通过克服约束（例如，速率编码水平）来维持跳跃表现。
