Strength and Conditioning, Australian Institute of Sport, Bruce, Australia.
Research Institute for Sport and Exercise, University of Canberra, Bruce, Australia.
J Strength Cond Res. 2018 Apr;32(4):955-961. doi: 10.1519/JSC.0000000000002432.
Williams, KJ, Chapman, DW, Phillips, EJ, and Ball, N. Load-power relationship during a countermovement jump: A joint level analysis. J Strength Cond Res 32(4): 955-961, 2018-This study aimed to investigate whether hip, knee, and ankle peak power is influenced by the relative load lifted, altering the joint and system load-power relationship during a countermovement jump (CMJ). Twenty-three male national representative athletes (age: 20.3 ± 3.1 years, squat 1 repetition maximum [1RM]: 133.8 ± 24.8 kg) completed 3 CMJs at relative barbell loads of 0, 10, 20, 30, and 40% of an athlete's estimated back squat 1RM. Ground reaction force and joint kinematics were captured using a 16 camera motion capture array integrated with 2 in-ground triaxial force plates. Hip ((Equation is included in full-text article.)= 20%, range 0 > 40%), knee ((Equation is included in full-text article.)= 0%, 0 > 20%), and ankle ((Equation is included in full-text article.)= 40%, 0 > 40%) peak power was maximized at different percentages of absolute strength, with an athlete-dependent variation in load-power profiles observed across all lower-body joints. A decrease in system (body + barbell mass) peak power was significantly (p ≤ 0.05, r = 0.45) correlated with a reduction in knee peak power. Timing of instantaneous system and hip peak power occurred significantly closer to toe-off as load increased. The findings highlight that the generation and translation of lower-body joint power is influenced by external load and athlete-dependent traits. This subsequently alters the load-power profile at a system level, explaining the broad spectrums of loads reported to optimize system power during a CMJ. When training, we recommend that a combination of barbell loads based on assorted percentages of the estimated 1RM be prescribed to optimize joint and system power during a CMJ.
威廉姆斯，KJ，查普曼，DW，菲利普斯，EJ，和球，N。在反跳期间的负载功率关系：关节水平分析。J 强度条件研究 32(4)：955-961，2018-本研究旨在探讨髋关节，膝关节和踝关节的峰值功率是否受到提升的相对负载的影响，从而改变反跳（CMJ）期间的关节和系统负载功率关系。23 名男性国家代表运动员（年龄：20.3±3.1 岁，深蹲 1 重复最大[1RM]：133.8±24.8 公斤）在相对杠铃负荷为 0，10，20，30 和 40%的运动员估计的背部深蹲 1RM 时完成了 3 次 CMJ。地面反作用力和关节运动学使用 16 相机运动捕捉阵列与 2 个地面三轴力板集成进行捕获。髋关节（方程包含在全文文章中。）= 20%，范围 0>40%，膝关节（方程包含在全文文章中。）= 0%，0>20%，和踝关节（方程包含在全文文章中。）= 40%，0>40%的峰值功率在不同的绝对强度百分比处最大化，在所有下肢关节中观察到与运动员依赖性变化的负载功率曲线。系统（身体+杠铃质量）峰值功率的下降与膝关节峰值功率的降低显著相关（p≤0.05，r=0.45）。随着负载的增加，系统和髋关节瞬时峰值功率的发生时间明显更接近脚趾离地。研究结果表明，下肢关节功率的产生和传递受到外部负载和运动员依赖性特征的影响。这随后改变了系统水平的负载功率曲线，解释了在 CMJ 期间优化系统功率的负载范围广泛。在训练时，我们建议根据估计的 1RM 的各种百分比规定杠铃负荷的组合，以优化 CMJ 期间的关节和系统功率。
