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. 2021 Mar 5;117:110250. doi: 10.1016/j.jbiomech.2021.110250. Epub 2021 Jan 15.
Peak vertical tibial accelerations during running have shown strong correlations with vertical ground reaction force loading rates and some associations with injury. However, little attention has been given to tibial accelerations along the medial-lateral and anterior-posterior axes. Therefore, our purpose was to examine the correlation between peak tibial accelerations and ground reaction force loading rates in the medial-lateral and posterior directions. Eighteen recreational runners were recruited who ran with a rearfoot strike pattern (10 men/ 8 women, mean age (yrs) = 33 ± 11). Tibial accelerations and ground reaction forces were collected while participants ran on an instrumented treadmill at a self-selected speed. Correlations were developed for: a) peak medial and lateral accelerations with lateral and medial loading rates, respectively, b) peak anterior tibial accelerations and posterior loading rates. Significant correlations were found between tibial accelerations and loading rates in all planes. Peak medial tibial accelerations were correlated with lateral loading rates (R = 0.86, p < 0.001) and peak lateral tibial accelerations were correlated with peak medial loading rates (R = 0.91, p < 0.001). A lower correlation was found between anterior accelerations and posterior loading rates (R = 0.51, p = 0.030). Tibial accelerations in the medial-lateral plane seem to be a valid surrogate for the respective ground reaction force measures during running on a treadmill, explaining 74-83% of the variance in loading rates. However, with only 26% of the variance explained, the same may not be true for anterior tibial accelerations and posterior loading rates.
在跑步过程中，胫骨的垂直峰值加速度与垂直地面反作用力加载率之间存在很强的相关性，并且与某些损伤有关。然而，人们对沿内外侧和前后方向的胫骨加速度关注甚少。因此，我们的目的是研究胫骨峰值加速度与内外侧和后向地面反作用力加载率之间的相关性。
我们招募了 18 名有后足着地模式的休闲跑步者（10 名男性/8 名女性，平均年龄（岁）=33±11）。参与者在仪器化跑步机上以自选速度跑步时，收集胫骨加速度和地面反作用力。分别建立了以下相关性：a）峰值内外侧加速度与各自的内外侧加载率之间的相关性，b）胫骨前峰值加速度与后向加载率之间的相关性。
在所有平面上都发现胫骨加速度与加载率之间存在显著相关性。胫骨内侧峰值加速度与外侧加载率相关（R=0.86，p<0.001），胫骨外侧峰值加速度与内侧峰值加载率相关（R=0.91，p<0.001）。前向加速度与后向加载率之间的相关性较低（R=0.51，p=0.030）。
在跑步机上跑步时，胫骨在内外侧平面上的加速度似乎是相应地面反作用力测量的有效替代指标，解释了加载率变化的 74-83%。然而，仅解释了 26%的方差，胫骨前向加速度与后向加载率可能并非如此。
