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Article Dans Une Revue Journal of Theoretical Biology Année : 2015

Effect of walking speed on the gait of king penguins: An accelerometric approach

Résumé

Little isknownaboutnon-humanbipedalgaits.Thisisprobablyduetothefactthatmostlargeanimals are quadrupedalandthatnon-humanbipedalanimalsaremostlybirds,whoseprimaryformofloco- motion is flight. Verylittleresearchhasbeenconductedonpenguinpedestrianlocomotionwiththe focus insteadontheirassociatedhighenergyexpenditure.Inanimals,tri-axialaccelerometersarefre- quentlyusedtoestimatephysiologicalenergycost,aswellastodefine thebehaviourpatternofaspecies, or thekinematicsofswimming.Inthisstudy,weshowedhowanaccelerometer-basedtechniquecould be usedtodeterminethebiomechanicalcharacteristicsofpedestrianlocomotion.Eightkingpenguins, which representtheonlyfamilyofbirdstohaveanuprightbipedalgait,weretrainedtowalkona treadmill. Thetrunktri-axialaccelerationswererecordedwhilethebirdwaswalkingatfourdifferent speeds (1.0,1.2,1.4and1.6km/h),enablingtheamplitudeofdynamicbodyaccelerationalongthethree axes(amplitudeofDBAx, DBAy and DBAz), stridefrequency,waddlingandleaningamplitude,aswellas the leaningangletobedefined. Themagnitudeofthemeasuredvariablesshowedasignificant increase with increasingspeed,apartfromthebackwardsangleoflean,whichdecreasedwithincreasingspeed. The variabilityofthemeasuredvariablesalsoshowedasignificant increasewithspeedapartfromthe DBAz amplitude, thewaddlingamplitude,andtheleaningangle,wherenosignificant effectofthe walkingspeedwasfound.Thispaperisthe first approachtodescribe3Dbiomechanicswithanaccel- erometeronwildanimals,demonstratingthepotentialofthistechnique.
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Dates et versions

hal-01236737 , version 1 (02-12-2015)

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Astrid S.T. Willener, Yves Handrich, Lewis G. Halsey, Siobhán Strike. Effect of walking speed on the gait of king penguins: An accelerometric approach. Journal of Theoretical Biology, 2015, 387, pp.166-173. ⟨10.1016/j.jtbi.2015.09.019⟩. ⟨hal-01236737⟩
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