Sports Performance Research Institute New Zealand (SPRINZ), AUT University, Auckland, New Zealand.
National Institute of Fitness and Sports in Kanoya, Kanoya, Japan.
Sports Biomech. 2022 Nov;21(10):1291-1302. doi: 10.1080/14763141.2020.1762720. Epub 2020 May 28.
This study determined the acute changes in rotational work with thigh attached wearable resistance (WR) of 2% body mass during 50-m sprint-running. Fourteen athletes completed sprints with, and without, WR in a randomised order. Sprint times were measured via timing gates at 10-m and 50-m. Rotational kinematics were obtained over three phases (steps 1-2, 3-6 and 7-10) via inertial measurement unit attached to the left thigh. Quantification of thigh angular displacement and peak thigh angular velocity was subsequently derived to measure rotational work. The WR condition was found to increase sprint times at 10-m (1.4%, effect size [ES] 0.38, p 0.06) and 50-m (1.9%, ES 0.55, p 0.04). The WR condition resulted in trivial to small increases in angular displacement of the thigh during all phases (0.6-3.4%, ES 0.04-0.26, p 0.09-0.91). A significant decrease in angular velocity of the thigh was found in all step phases (-2.5% to -8.0%, ES 0.17-0.51, p < 0.001-0.04), except extension in step phase 1 with the WR. Rotational work was increased (9.8-18.8%, ES 0.35-0.53, p < 0.001) with WR in all phases of the sprint. Thigh attached WR provides a means to significantly increase rotational work specific to sprinting.
本研究旨在确定在 50 米短跑中，大腿附着式可穿戴阻力（WR）为 2%体重时旋转工作的急性变化。14 名运动员以随机顺序完成了带有和不带有 WR 的短跑。通过 10 米和 50 米处的计时门测量冲刺时间。通过附着在左大腿上的惯性测量单元，在三个阶段（步骤 1-2、3-6 和 7-10）获得旋转运动学。随后，通过量化大腿的角位移和峰值大腿角速度来测量旋转功。WR 条件使 10 米（1.4%，效应大小 [ES] 0.38，p 0.06）和 50 米（1.9%，ES 0.55，p 0.04）的冲刺时间增加。在所有阶段，WR 条件使大腿的角位移增加很小（0.6-3.4%，ES 0.04-0.26，p 0.09-0.91）。在所有阶段的腿部阶段，腿部角速度都显著降低（-2.5%至-8.0%，ES 0.17-0.51，p < 0.001-0.04），除了 WR 阶段 1 的伸展阶段。在所有冲刺阶段，旋转功都增加了（9.8-18.8%，ES 0.35-0.53，p < 0.001）。大腿附着式 WR 提供了一种显著增加特定于短跑的旋转功的方法。
