摘要
Background:Theforefootrunningfootfallpatternhasbeensuggestedtoreducetheriskofdevelopingrunningrelatedoveruseinjuriesduetoareductionofimpactrelatedvariablescomparedwiththerearfootrunningfootfallpattern.However,onlytime-domainimpactvariableshavebeencomparedbetweenfootfallpatterns.Thefrequencycontentoftheimpactshockandthedegreetowhichitisattenuatedmaybeofgreaterimportanceforinjuryriskandpreventionthantime-domainvariables.Therefore,thepurposeofthisstudywastodeterminethedifferencesinheadandtibialaccelerationsignalpowerandshockattenuationbetweenrearfootandforefootrunning.Methods:Nineteenhabitualrearfootrunnersand19habitualforefootrunnersranonatreadmillat3.5m/susingtheirpreferredfootfallpatternswhiletibialandheadaccelerationdatawerecollected.Themagnitudeofthefirstandsecondheadaccelerationpeaks,andpeakpositivetibialaccelerationwerecalculated.Thepowerspectraldensityofeachsignalwascalculatedtotransformtheheadandtibialaccelerationsinthefrequencydomain.Shockattenuationwascalculatedbyatransferfunctionoftheheadsignalrelativetothetibia.Results:Peakpositivetibialaccelerationandsignalpowerinthelowerandhigherrangesweresignificantlygreaterduringrearfootthanforefootrunning(/><0.05).Thefirstandsecondheadaccelerationpeaksandheadsignalpowerwerenotstatisticallydifferentbetweenpatterns(p>0.05).Rearfootrunningresultedinsignificantlygreatershockattenuationforthelowerandhigherfrequencyrangesasaresultofgreatertibialacceleration(p<0.05).Conclusion:Thedifferenceinimpactshockfrequencycontentbetweenfootfallpatternssuggeststhattheprimarymechanismsforattenuationmaydiffer.Therelationshipbetweenshockattenuationmechanismsandinjuryisnotclearbutgiventhedifferencesinimpactfrequencycontent,neitherfootfallpatternmaybemorebeneficialforinjury,ratherthetypeofinjurysustainedmayvary
出版日期
2014年02月12日（中国期刊网平台首次上网日期，不代表论文的发表时间）
