HSE311 - Performane Analysis of 100m sprint

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Transcript of HSE311 - Performane Analysis of 100m sprint

  1. 1. 1|P a g e Mero,KomiandGregor(1992)identifyreactiontime,forceproductionbyacceleration (throughstridefrequencyandlength)andoverallforceproductionasbeingsomeofthekey componentsthatdictatesuccessinsprintingperformance.Assuch,thesewillbethefocus ofthisanalysisofJohanBlakes100metresprintperformanceattheLondonOlympicsfinal in2012. Reactiontime Reactiontimewasmeasuredfromthefirstinitialmovementoftheathleteuntiltheirlead legleavesthegroundatthebeginningoftherace.UsainBoltsreactiontimewasmeasured at.36ofasecond,whereasJohanBlakesreactiontimewasmeasuredat.40ofasecond. Stridefrequency UsainBoltcompleted41stridesacross100m,whereasJohanBlakecompleted46strides across100m.Thiswasdeterminedbycountingthenumberofstridesofeachathletefrom theirfirststrideatthestarttothefinalstridewithinthe100metredistance.Stridelength wasmeasuredfromtheathletestoeoftheirbackfoottothetoeoftheirfrontfootduring thelast10metresoftherace,ascertainedbythelinesofmeasurementonthetrack.
  2. 2. 2|P a g e Stridelength Atthesamepointintherace(14.02metrestogobeforethefinishline),UsainBoltsstride lengthwas2.17metres,whereasYohanBlakesstridelengthwas1.63metres.Thiswas calibratedaccordingtotheIAAFstrackmeasurements(IAAF,2015).Basedonstride frequency,Boltsaveragestridelength(takingintoaccountashortfirststride)was2.43 metres,whereasJohanBlakesaveragestridelengthwas2.17metres. Timeperstride UsainBoltstimewas9.63secondsfor100m,whereasJohanBlakestimewas9.75seconds for100m.Basedontotaltimeandstridenumber,UsainBoltmadeastrideevery0.23 seconds,whereasYohanBlakemadeastrideevery0.21seconds. Heightandweightoftheathletes AccordingtoESPN(2015),YohanBlakeis180cmandweighs84kilograms.Thesamesource (ESPN)statesUsainBoltsheightas196cmandweightas86kg. Intermsofthisanalysis,reactiontime,stridefrequency,stridelengthandtimeperstride areconsideredthekeycomponentsofsuchashortracedurationasmentioned.Through analysis,apartfromthesevariables,therewaslittletodistinguishtheperformancesofBlake andBolt.ConsideringtheadvantagesthatBolthadwiththesekeyvariablesduringtherace, theresultwasquiteclosebetweenthetworunners.
  3. 3. 3|P a g e Summarytableofresults: YohanBlake UsainBolt Reactiontime 0.4seconds 0.36seconds Stridefrequency 46strides 41strides Stridelength(last10m) 1.63metres 2.17metres Timeperstride 0.21seconds 0.23seconds Height+Weight 180cm+84kg 196cm+86kg KeyinformationforYohanBlakescoach: Inaracethatwasdecidedby0.12ofasecond,Blakesreactiontimeof0.4seconds asopposedtohiscounterpartBoltsreactiontimeof0.36isanareafor improvement.Blakesreactiontimeatthebeginningofaraceneedstobequickerto getatleastanevenstartwithhiscompetitors,orideallyaheadstart.Thisneedsto beachievedusingwhichevermeansavailabletohim(music,caffeine,pre-race routineetc) Havingaheightadvantageandthusagreaterstridelength,Boltisalwaysgoingto haveanadvantageoverBlake.Agreaterstridefrequencymeansheismaking contactwiththegroundmorefrequentlythanBolt,andthusdecreasingthetime whereheismovingforwardtowardsthefinishline. TheincreasedstridelengthofBoltoverBlakeisalsoanadvantageasheismaking contactwiththegroundforlesstimethanBlakeandthusismakingmoreforward progresstowardsthefinishline.Thereisamaximumstridelengththatanathlete canreachduetothelengthoftheirlimbs,howeverBlakeshouldaimtoreachthis maximumlengthconsistentlythroughoutarace,particularlyatthebeginning.This willdecreasehisstriderateandtimemakingcontactwiththeground,whichwillbe advantageous. Asalreadymentioned,Blakesheightdifferentialtohiscompetitorsmeanshisstride lengthisdecreasedandhisstriderateisincreased,andhealsoweighslessthan Bolt.Heobviouslycannotincreasehisheight,howeverhecanpotentiallydiminish thisdisadvantagebyweighingmorethanhiscompetitorspeciallyincreasingcross- sectionalareaandmusclemassofhislowerbodytoincreasestrengthandpower output.Bydoingthis,hecouldpotentiallyincreasethepowergeneratedashe
  4. 4. 4|P a g e makescontactwiththeground,resultinginmoreforwardmomentumandabetter raceperformance. Limitationsoftheanalysis: Duetothecameraangles,itwasdifficulttogetagoodviewofthetwoathletes togetheratthesamepointintherace,particularlyforthepurposeofcomparing stridelengthandcalibratingadistanceonthetrack, Thepresenceofothercompetitorsonthetrackoftenobscuredtheanalystsviewof JohanBlakeduringtherace,makingaccurateanalysisquitedifficult,and Theresolutionofthefootageisgrainyinsomeparts,makinglimbsoftheathletes blurredwhichmadeitdifficulttolocateanatomicalpointsonathletestoprovide accuratemeasuresofvariablessuchasstridelengthandreactiontime. Linktoannotatedvideo: http://air.deakin.edu.au/public/media/HSE311+Performance+Analysis+Video+- +Samuel+Ryan+-+211338161/0_bhy46igf. References: ESPN2015,retrieved28May2015, . ESPN2015,retrieved28May2015,. Mero,A,Komi,V,&Gregor,R1992.Biomechanicsofsprintrunning,JournalofSports Medicine,vol.13,no.6,pp.376-392. IAAF2015,retrieved28May2015,.>