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Abstract：
Lower-limb wearable resistance (WR) provides a specific and targeted overload to the musculature involved in sprint running, however, it is unknown if greater impact forces occur with the additional limb mass. This study compared the contact times and ground reaction force waveforms between sprint running with no load and 2% body mass (BM) shank-positioned WR over 30 m. Fifteen male university-level sprint specialists completed two maximum effort sprints with each condition in a randomized order. Sprint running with shank WR resulted in trivial changes to contact times at 5 m, 10 m, and 20 m (effect size [ES] = <0.20, p > 0.05) and a small, significant increase to contact time at 30 m by 1.94% (ES = 0.25, p = 0.03). Significant differences in ground reaction force between unloaded and shank loaded sprint running were limited to the anterior-posterior direction and occurred between 20% and 30% of ground contact at 10 m, 20 m, and 30 m. Shank WR did not result in greater magnitudes of horizontal or vertical forces during the initial impact portion of ground contact. Practitioners can prescribe shank WR training with loads ≤2% BM without concern for increased risk of injurious impact forces.
摘要：
下肢可穿戴阻力（WR）为参与短跑的肌肉组织提供了特定且有针对性的超负荷，然而,这是未知的，如果更大的冲击力发生与额外的肢体质量。这项研究比较了30m以上无负荷冲刺和2％体重（BM）小腿定位的WR之间的接触时间和地面反作用力波形。15名男性大学级冲刺专家按随机顺序完成了两种最大努力冲刺。用小腿WR进行冲刺导致5米时接触时间的微小变化，10米,和20米(效应大小[ES]=<0.20，p>0.05)和一个小，30米接触时间显著增加1.94%(ES=0.25，p=0.03)。无负载和小腿负载短跑之间的地面反作用力的显着差异仅限于前后方向，并且发生在10m处的地面接触的20％至30％之间，20米,和30m。在地面接触的初始冲击部分，ShankWR并未导致更大的水平或垂直力。从业者可以在负载≤2％BM的情况下规定小腿WR训练，而不必担心会增加伤害性冲击力的风险。
