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Relationship of Foot Strike Pattern and Landing Impacts during a Marathon

机译：马拉松脚罢工模式与着陆冲击的关系

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Purpose Foot strike patterns (FSP) influence landing mechanics, with rearfoot strike (RFS) runners exhibiting higher impact loading than forefoot strike (FFS) runners. The few studies that included midfoot strike (MFS) runners have typically grouped them together with FFS. In addition, most running studies have been conducted in laboratories. Advances in wearable technology now allow the measurement of runners' mechanics in their natural environment. The purpose of this study was to examine the relationship between FSP and impacts across a marathon race. Methods A total of 222 healthy runners (119 males, 103 females; age, 44.1 +/- 10.8 yr) running a marathon race were included. A treadmill assessment was undertaken to determine FSP. An ankle-mounted accelerometer recorded tibial shock (TS) over the course of the marathon. TS was compared between RFS, MFS, and FFS. Correlations between speed and impacts were examined between FSP. TS was also compared at the 10- and 40-km race points. Results RFS and MFS runners exhibited similar TS (12.24g +/- 3.59g vs 11.82g +/- 2.68g, P = 0.46) that was significantly higher (P < 0.001 and P < 0.01, respectively) than FFS runners (9.88g +/- 2.51g). In addition, TS increased with speed for both RFS (r = 0.54, P = 0.01) and MFS (r = 0.42, P = 0.02) runners, but not FFS (r = 0.05, P = 0.83). Finally, both speed (P < 0.001) and TS (P < 0.001) were reduced between the 10- and the 40-km race points. However, when normalized for speed, TS was not different (P = 0.84). Conclusions RFS and MFS exhibit higher TS than FFS. In addition, RFS and MFS increase TS with speed, whereas FFS do not. These results suggest that the impact loading of MFS is more like RFS than FFS. Finally, TS, when normalized for speed, is similar between the beginning and the end of the race.
机译：目的脚冲击模式（FSP）影响着陆力学，后脚攻击（RFS）跑步者表现出比前足冲击（FFS）跑步者更高的冲击载荷。包括Midfoot罢工（MFS）跑步者的少数研究通常与FF一起分组。此外，已经在实验室进行了大多数运行研究。可穿戴技术的进步现在允许在自然环境中测量跑步者的力学。本研究的目的是审查FSP之间的关系和在马拉松比赛中的影响。方法共有222名健康跑步者（119名男性，103名女性;年龄，44.1 +/-10.8岁）均被包括马拉松比赛。承接跑步机评估以确定FSP。在马拉松队的过程中，脚踝安装的加速度计记录了胫骨冲击（TS）。在RFS，MF和FF之间比较TS。在FSP之间检查了速度和冲击之间的相关性。在10千米和40公里的比赛点也比较了TS。结果RFS和MFS跑步者表现出类似的TS（12.24g +/- 3.59g vs 11.82g +/- 2.68g，p = 0.46），显着更高（分别比FFS跑步者（9.88g） +/- 2.51g）。此外，TS随着RFS（R = 0.54，P = 0.01）和MFS（R = 0.42，P = 0.02）的跑步者而增加，但不是FF（r = 0.05，p = 0.83）。最后，在10-和40公里的血管点之间降低了速度（P <0.001）和TS（P <0.001）。但是，当速度为速度时，TS并不不同（P = 0.84）。结论RFS和MFS表现出高于FFS。此外，RFS和MFS以速度增加TS，而FFS则不会增加TS。这些结果表明，MFS的冲击负载比FF更像RF。最后，TS，当速度正常化时，在比赛的开始和结尾之间类似。

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