Study On Foot Arch And Foot Muscle Neuromuscular Features Of Male Recreation Runners With Heel Pain

Purpose:In the long-distance running,the foot needs to be repeatedly landed and stretched.The arch of the foot acts as a medium for the human body and the ground,and plays a role of support,absorb and propulsion.The fatigue of the muscles of the instinct muscle causes the arch of the foot to fall,thereby causing damage.Muscle fatigue has been shown to be associated with a decrease in the arch of the foot.However,there is less research on the extinct muscle of the foot.In particular,the fatigue of the muscle that occurs after a run can often guide the runner to reasonably prevent injury and recovery.Therefore,this research studies the characteristics of the arch shape,muscle strength and surface electromyography(sEMG)of male recreation runners with foot pain,and explores the changes and differences of the arch shape,muscle strength and sEMG after a 20-kilometer running.Methods:12 male recreation runners with heel pain(pain group)and 12 healthy runners(control group)were recruited into the research,the foot posture index(FPI),Normalised Navicular Height Test(NNHT),ankle ROM,ankle isometric strength and lower leg sEMG on the ground were evaluated before and after a 20-kilometer running.Then these results were compared between pain group and control group.Results:(1)Before 20-kmrun,there was no significant difference in FPI and NNHT between the two groups.The FPI of both groups increased after running(P<0.05),and the NNHT of the pain group decreased(P<0.05).(2)Before the 20-km run,the isometric strength of the ankle dorsiflexion,inversion and eversion was lower in the pain group than in the control group(P<0.05),and the inversion strength decreased in both groups after running,there was also a decrease in dorsiflexion strength of control;(3)Before 20 km run,in the pain group,root mean square(RMS)of the tibialis anterior muscle(TA)during stance phase was higher than the controlgroup(P<0.05),and there was no significant difference on other muscles(P>0.05).The TA RMS of pain group increased during the preactivation phase,there were no differences on other muscles;(4)After 20 km of running,the mean power frequency(MPF)of the TA decreased in both groups during the preactivation phase,while the pain group decreased more significantly(P<0.05);(5)There was no differences or changes on ROM before and after running,so it is between two groups(P>0.05).Conclution:(1)Foot shape pronates after a 20-km run,and ankle injuries will make it more pronate.(2)The ankle inversion and dorsiflexion isometric strength will decrease after 20-km run.(3)20-km run will cause male runners to produce fatigue of the TA muscle,foot pain will make it more,so it is important to put more attention on it.(4)There is a loss of ankle muscle strength of dorsiflexion,inversion and eversion on foot pain runners,so it is important to make it stronger to prevent more injuries.