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dc.contributor.authorLenton, Gavin K
dc.contributor.authorDoyle, Tim LA
dc.contributor.authorLloyd, David G
dc.contributor.authorHiggs, Jeremy
dc.contributor.authorBilling, Daniel
dc.contributor.authorSaxby, David J
dc.date.accessioned2019-06-07T01:34:58Z
dc.date.available2019-06-07T01:34:58Z
dc.date.issued2019
dc.identifier.issn0021-9290
dc.identifier.doi10.1016/j.jbiomech.2018.11.036
dc.identifier.urihttp://hdl.handle.net/10072/383035
dc.description.abstractSoldiers regularly transport loads weighing >20 kg at slow speeds for long durations. These tasks elicit high energetic costs through increased positive work generated by knee and ankle muscles, which may increase risk of muscular fatigue and decrease combat readiness. This study aimed to determine how modifying where load is borne changes lower-limb joint mechanical work production, and if load magnitude and/or walking speed also affect work production. Twenty Australian soldiers participated, donning a total of 12 body armor variations: six different body armor systems (one standard-issue, two commercially available [cARM1-2], and three prototypes [pARM1-3]), each worn with two different load magnitudes (15 and 30 kg). For each armor variation, participants completed treadmill walking at two speeds (1.51 and 1.83 m/s). Three-dimensional motion capture and force plate data were acquired and used to estimate joint angles and moments from inverse kinematics and dynamics, respectively. Subsequently, hip, knee, and ankle joint work and power were computed and compared between armor types and walking speeds. Positive joint work over the stance phase significantly increased with walking speed and carried load, accompanied by 2.3–2.6% shifts in total positive work production from the ankle to the hip (p < 0.05). Compared to using cARM1 with 15 kg carried load, carrying 30 kg resulted in significantly greater hip contribution to total lower-limb positive work, while knee and ankle work decreased. Substantial increases in hip joint contributions to total lower-limb positive work that occur with increases in walking speed and load magnitude highlight the importance of hip musculature to load carriage walking.
dc.description.peerreviewedYes
dc.languageEnglish
dc.language.isoeng
dc.publisherElsevier Science
dc.relation.ispartofpagefrom174
dc.relation.ispartofpageto180
dc.relation.ispartofjournalJOURNAL OF BIOMECHANICS
dc.relation.ispartofvolume83
dc.subject.fieldofresearchBiomedical engineering
dc.subject.fieldofresearchMechanical engineering
dc.subject.fieldofresearchSports science and exercise
dc.subject.fieldofresearchcode4003
dc.subject.fieldofresearchcode4017
dc.subject.fieldofresearchcode4207
dc.titleLower-limb joint work and power are modulated during load carriage based on load configuration and walking speed
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
dcterms.licensehttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.description.versionAccepted Manuscript (AM)
gro.rights.copyright© 2019 Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence (http://creativecommons.org/licenses/by-nc-nd/4.0/) which permits unrestricted, non-commercial use, distribution and reproduction in any medium, providing that the work is properly cited.
gro.hasfulltextFull Text
gro.griffith.authorSaxby, David J.
gro.griffith.authorLloyd, David


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