Muscle activity and kinematics of forefoot and rearfoot strike runners

作     者：A.N.Ahn C.Brayton T.Bhatia P.Martin 

作者机构：Department of BiologyHarvey Mudd College Keck Science CenterScripps College Department of EngineeringHarvey Mudd College 

出 版 物：《Journal of Sport and Health Science》 (运动与健康科学（英文）)

年 卷 期：2014年第3卷第2期

页      面：102-112,153+156页

核心收录：

学科分类：0403[教育学-体育学] 040302[教育学-运动人体科学(可授教育学、理学、医学学位)] 04[教育学] 

基　　金：the Purves Summer Research Award Sherman Fairchild Foundation National Science Foundation (NSF-0634592) Howard Hughes Medical Institute Undergraduate Science Program award 52006301 to Harvey Mudd College 

主　　题：Barefoot Forefoot strike Gastrocnemius Muscle activity Rearfoot strike Running 

摘      要：Background:Forefoot strike(FFS) and rearfoot strike(RFS) runners differ in their kinematics,force loading rates,and joint loading patterns,but the timing of their muscle activation is less ***:Forty recreational and highly trained runners ran at four speeds barefoot and shod on a motorized treadmill. Barefoot runners wore thin,five-toed socks and shod runners wore neutral running *** were instructed to run comfortably at each speed with no instructions about foot strike ***:Eleven runners landed with an FFS when barefoot and shod and eleven runners landed with an RFS when barefoot and *** 18remaining runners shifted from an FFS when barefoot to an RFS when shod(shifters).Shod shifters ran with a lower stride frequency and greater stride length than all other *** FFS runners landed with more plantarflexed ankles and more vertical lower legs at the beginning of stance compared to RFS *** runners activated their plantarflexor muscles 1 1%earlier and 10%longer than RFS ***:This earlier and longer relative activation of the plantarrlexors likely enhances the capacity for the passive structures of the foot and ankle to store elastic energy,and may also enhance the performance of the active muscle by increasing the storage of elastic strain energy in the cross-bridaes and activated thin.