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Auteur (up) Abourachid, A.; Herbin, M.; Hackert, R.; Maes, L.; Martin, V. url  doi
  Titre Experimental study of coordination patterns during unsteady locomotion in mammals Type Article scientifique
  Année 2007 Publication The Journal of Experimental Biology Revue Abrégée J Exp Biol  
  Volume 210 Numéro Pt 2 Pages 366-372  
  Mots-Clés Animals; Biomechanical Phenomena; Cats/anatomy & histology/*physiology; Dogs/anatomy & histology/*physiology; Extremities/*physiology; Gait/*physiology; Locomotion/*physiology; Species Specificity; Time Factors  
  Résumé A framework to study interlimb coordination, which allowed the analysis of all the symmetrical and asymmetrical gaits, was recently proposed. It suggests that gait depends on a common basic pattern controlling the coordination of the forelimbs (fore lag, FL), the coordination of the hindlimbs (hind lag, HL) and the relationship between these two pairs of limbs (pair lag, PL) in an anteroposterior sequence of movement (APS). These three time parameters are sufficient for identifying all steady gaits. We assumed in this work that this same framework could also be used to study non-steady locomotion, particularly the transitions between symmetrical and asymmetrical gaits. Moreover, as the limbs are coordinated in time and also in space during locomotion, we associated three analogous space parameters (fore gap, FG; hind gap, HG and pair gap, PG) to the three time parameters. We studied the interlimb coordination of dogs and cats moving on a runway with a symmetrical gait. In the middle of the runway, the gait was disturbed by an obstacle, and the animal had to change to an asymmetrical coordination to get over it. The time (FL, HL, PL) and space (FG, HG, PG) parameters of each sequence of the trials were calculated. The results demonstrated that the APS method allows quantification of the interlimb coordination during the symmetrical and asymmetrical phases and during the transition between them, in both dogs and cats. The space and time parameters make it possible to link the timing and the spacing of the footfalls, and to quantify the spatiotemporal dimension of gaits in different mammals. The slight differences observed between dogs and cats could reflect their morphological differences. The APS method could thus be used to understand the implication of morphology in interlimb coordination. All these results are consistent with current knowledge in biomechanics and neurobiology, therefore the APS reflects the actual biological functioning of quadrupedal interlimb coordination.  
  Adresse FRE2696, CNRS, MNHN, Universite P6, Col. de France, Museum National d'Histoire Naturelle, Departement Ecologie et Gestion de la Biodiversite, FRE 2696, Pavillon d'Anatomie Comparee, CP 55, 57 rue Cuvier, 75231 Paris cedex 05, France.  
  Auteur institutionnel Thèse  
  Editeur Lieu de Publication Éditeur  
  Langue English Langue du Résumé Titre Original  
  Éditeur de collection Titre de collection Titre de collection Abrégé  
  Volume de collection Numéro de collection Edition  
  ISSN 0022-0949 ISBN Médium  
  Région Expédition Conférence  
  Notes PMID:17210971 Approuvé pas de  
  Numéro d'Appel MNHN-CNRS @ hackert @ collection 154  
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