跑步时足偏角对胫骨冲击影响的探索性研究

Exploration Study about Influence of Foot Progression Angle on Tibial Shock During Running

目的探究跑步时足偏角对胫骨冲击的影响。方法 15名健康成年受试者分别以惯用、内八、外八的步态跑步,比较跑步者在不同足偏角跑步时的胫骨冲击(通过冲击峰值、平均加载率、最大加载率和最大胫骨加速度表征),探究跑步时足偏角对胫骨冲击是否有影响。并且比较跑步者不同步态下的躯干前倾角、着地方式、步频和步宽的变化,探究影响可能的原因。结果与惯用步态相比,内八和外八步态的最大胫骨加速度分别显著增加19.3%和24.5%,冲击峰值均显著增加7.6%,平均加载率分别显著增加7.9%和9.5%,最大加载率分别显著增加3.9%和10.9%。没有观测到躯干前倾角、着地方式、步频和步宽的显著性变化。结论足偏角有可能是除躯干前倾角、着地方式、步频和步宽外的另一种影响胫骨冲击的步态运动学参数,对其进行进一步研究将对预防胫骨应力性骨折提供重要参考。

Objective To study the influence of foot progression angle on tibial shock during running.Methods The normal,toe-in and toe-out gait of fifteen healthy adults was tested during running trials on a treadmill.The differences in tibial shock(impact peak,average loading rate,instantaneous loading rate and maximum tibia acceleration)for runners at different foot progression angles were analyzed to explore the influence of foot progression angle on tibial shock.The changes in sagittal plane trunk angle,strike pattern,stride frequency and step width of runners under three gaits were also compared to explore its possible causes.Results Compared with normal gait,the maximum tibial acceleration of toe-in and toe-out gait was increased by 19.3%and 24.5%,impact peak was increased by 7.6%,average loading rate was increased by 7.9%and 9.5%,instantaneous loading rate was increased by 3.9%and 10.9%,with significant statistic differences.No significant changes were found in sagittal plane trunk angle,strike pattern,stride frequency and step width.Conclusions Foot progression angle might be an another gait parameter which affected tibial shock during running in addition to other related known gait parameters such as sagittal plane trunk angle,strike pattern,stride frequency and step width,which would provide an important reference for prevention of tibial stress fracture.