胸部穿戴的加速度计在冲刺时检测与疲劳相关的垂直刚度变化
Benjamin J Horsley1,2, Paul J Tofari1,2, Shona L Halson1,2
1Sports Performance, Recovery, Injury and New Technologies (SPRINT) Research Centre, Australian Catholic University, Melbourne, Australia.
Journal of strength and conditioning research
|October 26, 2023
概括
胸部加速度计可以在高速冲刺时检测与疲劳相关的垂直刚度变化. 这项技术可能有助于在没有额外测试的情况下监测神经肌肉疲劳,但在较低的速度下不会显示变化.
科学领域:
- 运动科学 运动科学 运动科学
- 生物力学 生物力学
- 运动生理学 运动生理学
背景情况:
- 胸部佩戴的加速度计提供了一种非侵入性方法来评估跑步步态和神经肌肉疲劳 (NMF).
- 它们在检测取决于速度的疲劳相关步态变化的灵敏度尚不清楚.
- 在没有额外测试的情况下评估NMF,如反运动跳跃 (CMJ),对于训练和比赛来说是可取的.
研究的目的:
- 评估胸部加速度计检测疲劳引起的步行特征变化,特别是垂直硬 (K vert) 的能力.
- 为了评估这些变化在不同的运行速度 (3-4,5-6,和7-8 m·s-1).
- 为了比较加速度计衍生的步态变化与重复冲刺协议 (RSP) 后的CMJ性能.
主要方法:
- 16名娱乐活动参与者接受了RSP前后评估.
- 评估包括单次和重复的CMJ在强力板上,以及以不同速度进行40米冲刺.
- 步行特征是通过使用经过验证的算法从胸部安装的加速度计获得的.
- 在前后评估之间进行了12 × 40m的RSP.
主要成果:
- 在RSP后7-8 m·s-1观察到垂直刚度 (K vert) 的显著降低 (-8.51 kN·m-1).
- 这种K vert的下降与CMJ期间跳跃高度的显著减少有关.
- 在任何速度下,其他步行特征 (例如接触时间,步骤频率) 没有显著变化.
- 在较低速度 (3-4和5-6 m·s-1) 的运行机制在RSP后没有显著改变.
结论:
- 胸部佩戴的加速度计可以在高速冲刺 (7-8 m·s-1) 期间检测与疲劳相关的垂直刚度下降.
- 这一指标可以作为监测运动员神经肌肉疲劳的有用指标.
- 在较低的跑步速度下,重复冲刺协议似乎不会改变步态机制.
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