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1、Vol463
2、28January2010
3、doi:10.1038/nature08723LETTERSFootstrikepatternsandcollisionforcesinhabituallybarefootversusshodrunners11,2314DanielE.Lieberman,MadhusudhanVenkadesan*,WilliamA.Werbel*,AdamI.Daoud*,SusanD’Andrea,56,76,7IreneS.Davis,RobertOjiamboMang’Eni&YannisPitsil
4、adis1Humanshaveengagedinendurancerunningformillionsofyears,transient,Mbodyisthebodymass,vcomistheverticalspeedofthebutthemodernrunningshoewasnotinventeduntilthe1970s.Forcentreofmass,vfootistheverticalspeedofthefootjustbeforeimpactmostofhumanevolutionaryhistory,runnerswe
5、reeitherbarefootandgistheaccelerationduetogravityattheEarth’ssurface.orworeminimalfootwearsuchassandalsormoccasinswithsmal-ImpacttransientsassociatedwithRFSrunningaresuddenforceslerheelsandlittlecushioningrelativetomodernrunningshoes.withhighratesandmagnitudesofloadingt
6、hattravelrapidlyuptheWewonderedhowrunnerscopedwiththeimpactcausedbythebodyandthusmaycontributetothehighincidenceofrunning-footcollidingwiththegroundbeforetheinventionofthemodernrelatedinjuries,especiallytibialstressfracturesandplantarshoe.Hereweshowthathabituallybarefoo
7、tendurancerunners6–8fasciitis.ModernrunningshoesaredesignedtomakeRFSrunningoftenlandonthefore-foot(fore-footstrike)beforebringingdowncomfortableandlessinjuriousbyusingelasticmaterialsinalargetheheel,buttheysometimeslandwithaflatfoot(mid-footstrike)heeltoabsorbsomeofthet
8、ransientforceandspreadtheimpulseoveror,lessoften,ontheheel(rear-footstrike).Incontrast,habitually9moretime(Fig.1b).Thehumanheelpadalsocushionsimpactshodrunnersmostlyrear-footstrike,facilitatedbytheelevated5,10,11transients,buttoalesserextent,raisingthequestionofhowandcu
9、shionedheelofthemodernrunningshoe.Kinematicandrunnersstruckthegroundbeforetheinventionofmodernrunningkineticanalysesshowthatevenonhardsurfaces,barefootrunnersshoes.Previousstudieshavefoundthathabituallyshodrunnerstendwhofore-footstrikegeneratesmallercollisionforcesthans
10、hodtoadoptaflatterfootplacementwhenbarefootthanwhenshod,thusrear-footstrikers.Thisdifferenceresultsprimarilyfr
