The effect of fatigue on running mechanics in older and younger runners.
The effect of fatigue on running mechanics in older and younger runners.
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DOI：
10.1016/j.gaitpost.2022.07.249
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发表时间：
2022-09
期刊：
影响因子：
2.4
通讯作者：
Radzak, Kara N
中科院分区：
文献类型：
--
作者：
Borgia, Brianne;Dufek, Janet S;Silvernail, Julia Freedman;Radzak, Kara N
疲劳的存在已经被证明可以改变跑步的生物力学。在整个跑步过程中，个人会变得更加疲劳，肌肉骨骼保护机制的有效性可能会降低。老年人处于持续过度使用跑步相关损伤的高风险中。这可以部分解释为肌肉骨骼系统和负荷衰减的变化。目的是比较老年人和年轻人之间的疲劳后跑步力学。30名年龄在18-65岁之间的跑步者（15名年轻人，15名老年人）参加了这项研究。所有参与者每周至少跑15英里。使用10摄像机运动捕捉系统捕捉跑步运动学，同时参与者在10米跑道上跑步，力平台在两种条件下收集动力学数据：C1：以3.5 m/s（± 5%）的受控速度休息状态; C2：运动后协议，其中速度不受控制，而是基于心率和RPE进行监测，代表某种程度上的强度运动。在C2之前，参与者经历了一个劳力方案，包括最大运动试验，以诱导疲劳和所需的冷却。进行2（疲劳状态）× 2（年龄）MANOVA，以检验疲劳和年龄的影响及其相互作用。未观察到疲劳x年龄相互作用的状态。年龄对峰值膝关节伸展力矩（Y > O; p = 0.01）、最大膝关节力量（Y > O; p = 0.04）、最大髋关节力量（O >Y; p = 0.04）和峰值垂直地面反作用力（Y > O; p = 0.007）有主效应。与年龄无关，与C1相比，C2参与者的膝关节ROM降低（p = 0.007），髋关节伸展力矩更大（p < 0.001）。虽然在膝盖和髋关节力学的整体不同，观察到的细微差异表明，老年跑步者表现出可比的步态适应疲劳后年轻的体积匹配的跑步者。
The presence of fatigue has been shown to modify running biomechanics. Throughout a run individuals become more fatigued, and the effectiveness of the musculoskeletal protective mechanism can diminish. Older adults are at an elevated risk for sustaining an overuse running related injury. This can be partially explained by changes in the musculoskeletal system and load attenuation. The purpose was to compare post-fatigue running mechanics between older and younger runners. Thirty runners (15 young, 15 older) between the ages of 18–65 participated in this study. All participants ran at least 15 miles/week. Running kinematics were captured using a 10-camera motion capture system while participants ran over a 10-m runway with force platforms collecting kinetic data under two conditions: C1: rested state at a controlled pace of 3.5 m/s ( ± 5%); C2: post-exertional protocol where pace was not controlled, rather it was monitored based on heartrate and RPE representative of somewhat-hard to hard intensity exercise. Prior to C2, participants underwent an exertional protocol that consisted of a maximal exercise test to induce fatigue and a required cool-down. A 2 (state of fatigue) × 2 (age) MANOVA was run to test for the effects of fatigue and age and their interactions. No state of fatigue x age interaction was observed. A main effect of age for peak knee extension moment (Y > O; p = 0.01), maximum knee power (Y > O; p = 0.04), maximum hip power (O >Y; p = 0.04), and peak vertical ground reaction force (Y > O; p = 0.007). Regardless of age, participants exhibited decreased knee ROM (p = 0.007) and greater hip extension moment (p < 0.001) in C2 compared to C1. While different in knee and hip mechanics overall, the subtle differences observed demonstrate that older runners exhibit comparable gait adaptions post-fatigue to younger volume-matched runners.