Center for Applied Sport, Exercise and Nutritional Sciences, School of Sport and Wellbeing, Faculty of Health and Wellbeing, University of Central Lancashire, Preston, United Kingdom.
Center for Health Sciences Research, School of Health Sciences, University of Salford, Salford, United Kingdom ; and.
J Strength Cond Res. 2021 Apr 1;35(4):1030-1038. doi: 10.1519/JSC.0000000000002850.
Bentley, I, Sinclair, JK, Atkins, SJ, Metcalfe, J, and Edmundson, CJ. Effect of velocity-based loading on acceleration kinetics and kinematics during sled towing. J Strength Cond Res 35(4): 1030-1038, 2021-Sled towing (ST) provides an external load in the form of a sled towed using a shoulder or waist harness and cord behind the athlete. Loading strategies have varied greatly between studies, and despite many investigations, there is little agreement on the optimum sled loading to develop the acceleration phase. The aim of this study was to investigate the kinetics and kinematics of velocity-based ST during the acceleration phase of sprinting. Twelve academy rugby league players performed a series of 6-m sprints in different conditions; uninhibited, 10, 15, and 20% velocity decrement (VDec). Sagittal plane kinematics and kinetic measures were examined using 1-way repeated-measures analysis of variance. Results indicated that ST affected trunk, knee, and ankle joint kinematics (p < 0.05). Peak knee flexion increased as sled loads increased (p < 0.05), which may enable athletes to lower their center of mass and increase their horizontal force application. Net horizontal and propulsive impulse measures were greater in all sled conditions (p < 0.05), which increased significantly because sled loadings were heavier. In conclusion, this study highlights the effects of differential loads to help coaches understand acute kinetics and kinematic changes to improve the planning of sprint training.
本特利、I、辛克莱、JK、阿特金斯、SJ、梅特卡夫、J 和埃德蒙森、CJ。速度负荷对 sled towing 中加速动力学和运动学的影响。J 力量与条件研究 35（4）：1030-1038，2021 年 sled towing（ST）以 sled 的形式提供外部负载，sled 通过运动员身后的肩带或腰带和绳索进行拖拉。加载策略在研究之间差异很大，尽管进行了许多调查，但对于开发加速阶段的最佳 sled 加载方式仍存在很大分歧。本研究的目的是研究 sprint 加速阶段中基于速度的 ST 的动力学和运动学。12 名学院橄榄球联盟运动员在不同条件下进行了一系列 6 米冲刺；不受抑制、10%、15%和 20%速度衰减（VDec）。使用单向重复测量方差分析检查了矢状面运动学和动力学测量值。结果表明，ST 影响了躯干、膝盖和踝关节的运动学（p<0.05）。随着 sled 负载的增加，膝盖的最大屈曲增加（p<0.05），这可能使运动员降低重心并增加水平力的应用。在所有 sled 条件下，净水平和推进冲量测量值都更大（p<0.05），因为 sled 负载更重。总之，本研究强调了不同负荷的影响，以帮助教练了解 sprint 训练中急性动力学和运动学的变化，从而提高 sprint 训练的计划。
