Show simple item record Bishop, KL Pai, AK Schmitt, D
dc.coverage.spatial United States 2011-06-21T17:31:26Z 2008
dc.identifier.citation PLoS One, 2008, 3 (11), pp. e3808 - ?
dc.description.abstract The metabolic cost associated with locomotion represents a significant part of an animal's metabolic energy budget. Therefore understanding the ways in which animals manage the energy required for locomotion by controlling muscular effort is critical to understanding limb design and the evolution of locomotor behavior. The assumption that energetic economy is the most important target of natural selection underlies many analyses of steady animal locomotion, leading to the prediction that animals will choose gaits and postures that maximize energetic efficiency. Many quadrupedal animals, particularly those that specialize in long distance steady locomotion, do in fact reduce the muscular contribution required for walking by adopting pendulum-like center of mass movements that facilitate exchange between kinetic energy (KE) and potential energy (PE). However, animals that are not specialized for long distance steady locomotion may face a more complex set of requirements, some of which may conflict with the efficient exchange of mechanical energy. For example, the "stealthy" walking style of cats may demand slow movements performed with the center of mass close to the ground. Force plate and video data show that domestic cats (Felis catus, Linnaeus, 1758) have lower mechanical energy recovery than mammals specialized for distance. A strong negative correlation was found between mechanical energy recovery and diagonality in the footfalls and there was also a negative correlation between limb compression and diagonality of footfalls such that more crouched postures tended to have greater diagonality. These data show a previously unrecognized mechanical relationship in which crouched postures are associated with changes in footfall pattern which are in turn related to reduced mechanical energy recovery. Low energy recovery was not associated with decreased vertical oscillations of the center of mass as theoretically predicted, but rather with posture and footfall pattern on the phase relationship between potential and kinetic energy. An important implication of these results is the possibility of a tradeoff between stealthy walking and economy of locomotion. This potential tradeoff highlights the complex and conflicting pressures that may govern the locomotor choices that animals make.
dc.format.extent e3808 - ?
dc.language eng
dc.language.iso en_US en_US
dc.relation.ispartof PLoS One
dc.relation.isversionof 10.1371/journal.pone.0003808
dc.subject Animals
dc.subject Cats
dc.subject Energy Metabolism
dc.subject Gait
dc.subject Locomotion
dc.subject Mechanics
dc.subject Walking
dc.title Whole body mechanics of stealthy walking in cats.
dc.title.alternative en_US
dc.type Journal Article
dc.description.version Version of Record en_US 2008-11-26 en_US
duke.description.endpage e3808 en_US
duke.description.issue 11 en_US
duke.description.startpage e3808 en_US
duke.description.volume 3 en_US
dc.relation.journal Plos One en_US
pubs.issue 11
pubs.organisational-group /Duke
pubs.organisational-group /Duke/Trinity College of Arts & Sciences
pubs.organisational-group /Duke/Trinity College of Arts & Sciences/Evolutionary Anthropology
pubs.publication-status Published
pubs.volume 3
dc.identifier.eissn 1932-6203

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