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dc.contributor.authorLussiana, Thibaulten_NZ
dc.contributor.authorPatoz, Aurélienen_NZ
dc.contributor.authorGindre, Cyrilleen_NZ
dc.contributor.authorMourot, Laurenten_NZ
dc.contributor.authorHébert-Losier, Kimen_NZ
dc.date.accessioned2019-06-23T23:18:32Z
dc.date.available2019-03-01en_NZ
dc.date.available2019-06-23T23:18:32Z
dc.date.issued2019en_NZ
dc.identifier.citationLussiana, T., Patoz, A., Gindre, C., Mourot, L., & Hébert-Losier, K. (2019). The implications of time on the ground on running economy: Less is not always better. Journal of Experimental Biology, 222(6). https://doi.org/10.1242/jeb.192047en
dc.identifier.issn0022-0949en_NZ
dc.identifier.urihttps://hdl.handle.net/10289/12623
dc.description.abstractA lower duty factor (DF) reflects a greater relative contribution of leg swing to ground contact time during the running step. Increasing time on the ground has been reported in the scientific literature to both increase and decrease the energy cost (EC) of running, with DF reported to be highly variable in runners. As increasing running speed aligns running kinematics more closely with spring-mass model behaviors and re-use of elastic energy, we compared the centre of mass (COM) displacement and EC between runners with a low (DFlow) and high (DFhigh) duty factor at typical endurance running speeds. Forty well-trained runners were divided in two groups based on their mean DF measured across a range of speeds. EC was measured from 4-min treadmill runs at 10, 12, and 14 km·h−1 using indirect calorimetry. Temporal characteristics and COM displacement data of the running step were recorded from 30-s treadmill runs at 10, 12, 14, 16, and 18 km·h−1. Across speeds, DFlow exhibited more symmetrical patterns between braking and propulsion phases in terms of time and vertical COM displacement than DFhigh. DFhigh limited global vertical COM displacements in favor of horizontal progression during ground contact. Despite these running kinematics differences, no significant difference in EC was observed between groups. Therefore, both DF strategies seem energetically efficient at endurance running speeds.
dc.format.mimetypeapplication/pdf
dc.language.isoenen_NZ
dc.publisherThe Company of Biologists Ltd.en_NZ
dc.rights© 2019. Published by The Company of Biologists Ltd
dc.subjectScience & Technologyen_NZ
dc.subjectLife Sciences & Biomedicineen_NZ
dc.subjectBiologyen_NZ
dc.subjectLife Sciences & Biomedicine - Other Topicsen_NZ
dc.subjectRunning formen_NZ
dc.subjectBiomechanicsen_NZ
dc.subjectEnergy costen_NZ
dc.subjectSelf-optimizationen_NZ
dc.subjectTAKE-OFF ASYMMETRYen_NZ
dc.subjectSPRING-MASS MODELen_NZ
dc.subjectENERGETIC COSTen_NZ
dc.subjectCONTACT TIMEen_NZ
dc.subjectSTRIDEen_NZ
dc.subjectWORKen_NZ
dc.subjectLOCOMOTIONen_NZ
dc.subjectBEHAVIORen_NZ
dc.titleThe implications of time on the ground on running economy: Less is not always betteren_NZ
dc.typeJournal Article
dc.identifier.doi10.1242/jeb.192047en_NZ
dc.relation.isPartOfJournal of Experimental Biologyen_NZ
pubs.elements-id236642
pubs.issue6en_NZ
pubs.publication-statusPublisheden_NZ
pubs.volume222en_NZ
dc.identifier.eissn1477-9145en_NZ
uow.identifier.article-noUNSP jeb192047


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