Johnson Caleb D, Outerleys Jereme, Tenforde Adam S, Davis Irene S
Spaulding National Running Center, Dept. of Physical Medicine and Rehabilitation, Harvard Medical School, Cambridge, MA, United States.
Spaulding National Running Center, Dept. of Physical Medicine and Rehabilitation, Harvard Medical School, Cambridge, MA, United States.
J Biomech. 2020 Dec 2;113:110118. doi: 10.1016/j.jbiomech.2020.110118. Epub 2020 Nov 8.
Peak tibial accelerations during running are of interest because of their correlation with vertical ground reaction force load rates and association with running injury. Previous work has demonstrated systematically lower accelerations measured with a bone- compared to skin-mounted accelerometer. However, no studies have assessed the effects of more or less secure attachment methods for skin mounted sensors. Our purpose was to compare two methods of attaching a skin mounted sensor on mean tibial accelerations, stride-to-stride variability, and correlations with vertical load rates. 18 injury-free runners were recruited as participants. An inertial measurement unit, containing a tri-axial accelerometer, was used to record tibial accelerations while participants ran at a self-selected speed on an instrumented treadmill to collect ground reaction forces. The two attachment methods for securing the sensor to the skin were a manufacturer-provided strap (strap condition) and a combination of tape and elastic wraps (wrap condition). Mean vertical accelerations were significantly lower in the wrap condition (p = 0.02, d = 0.57). No differences were detected in resultant accelerations, vertical loading rates, or stride-to-stride variability. Correlations between tibial accelerations and vertical loading rates were strong (r = 0.79-0.91) and similar between conditions. These results provide two key findings of evidence. Evidenced by systematically lower vertical accelerations, a more secure attachment method may be necessary for capturing the most representative measure of tibial accelerations during running. However, a less secure method (i.e. the strap) is sufficient for capturing tibial accelerations as a surrogate for impact loading forces.
跑步过程中的胫骨加速度峰值备受关注，因为它们与垂直地面反作用力加载率相关，且与跑步损伤有关。先前的研究表明，与安装在皮肤上的加速度计相比，用骨加速度计测量的加速度系统地更低。然而，尚无研究评估皮肤安装传感器的固定方式或多或少的安全性所产生的影响。我们的目的是比较两种将皮肤安装传感器固定在胫骨上的方法，比较其对平均胫骨加速度、步幅间变异性以及与垂直负荷率相关性的影响。招募了18名无损伤的跑步者作为参与者。使用一个包含三轴加速度计的惯性测量单元来记录胫骨加速度，参与者在装有仪器的跑步机上以自选速度跑步时收集地面反作用力。将传感器固定在皮肤上的两种固定方法分别是制造商提供的绑带（绑带条件）和胶带与弹性绷带的组合（包裹条件）。在包裹条件下，平均垂直加速度显著更低（p = 0.02，d = 0.57）。在合成加速度、垂直负荷率或步幅间变异性方面未检测到差异。胫骨加速度与垂直负荷率之间的相关性很强（r = 0.79 - 0.91），且两种条件下相似。这些结果提供了两个关键的证据发现。系统地更低的垂直加速度表明，可能需要一种更安全的固定方法来获取跑步过程中胫骨加速度的最具代表性的测量值。然而，一种不太安全的方法（即绑带）足以获取胫骨加速度作为冲击负荷力的替代指标。
