Coordination of cat hindlimb muscles during voluntary movements

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dc.contributor.advisorHerzog, Walter
dc.contributor.authorKaya, Motoshi
dc.date.accessioned2005-08-16T17:05:33Z
dc.date.available2005-08-16T17:05:33Z
dc.date.issued2004
dc.descriptionBibliography: p. 181-195en
dc.description.abstractIn order to gain insight into the mechanisms of the force-sharing between cat medial gastrocnemius (MG) and soleus (SOL), direct measurements of MG and SOL tendon forces were performed for a variety of movement tasks, while simul­taneously recording the kinematics and kinetics of the target movements. The purpose of this thesis was to investigate changes in MG and SOL forces for a variety of unrestrained movements, such as different speeds and intensities of walking, jumping, and paw shaking, and to develop a theoretical framework to gain insight into the control of MG and SOL forces, specifically, and voluntary movements in general. MG activities systematically increased with increasing mechanical requirements for all movement tasks. SOL activation during locomotion appeared to be regulated so that decreases in force potential, associated with changes in the contractile conditions, were offset to maintain SOL forces ap­proximately constant. During jumping, SOL was deactivated prematurely, and the corresponding forces fell to zero prior to the end of the take off phase. SOL shortening speed during jumping reached and exceeded the maximal speed of shortening, and it appears that the muscle was deactivated so as to preserve en­ergy in a situation where it could not contribute effectively to force production. Deactivation always occurred at or near the instant when SOL speed reached its maximal shortening value, therefore it seems that deactivation might have been triggered by a speed sensitive mechanism. Finally, a theoretical model was de­veloped to quantify the proximity of the component of the ground reaction force (GRF) produced by an individual muscle to the resultant GRF produced by the entire system. MG forces were tightly related to proximity, suggesting that MG might be preferentially activated to control the direction of the GRF. This result is in agreement with a conceptual model of muscle control proposed by the group of van lngen Schenau several years ago, but it provides first validation of these ideas through the newly developed theoretical model of the cat hindlimb, and the corresponding direct muscle force measurements.en
dc.format.extentxxi, 195 leaves : ill. ; 30 cm.en
dc.identifier.citationKaya, M. (2004). Coordination of cat hindlimb muscles during voluntary movements (Doctoral thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca. doi:10.11575/PRISM/16868en_US
dc.identifier.doihttp://dx.doi.org/10.11575/PRISM/16868
dc.identifier.isbn0612934926en
dc.identifier.lccAC1 .T484 2004 K39en
dc.identifier.urihttp://hdl.handle.net/1880/41654
dc.language.isoeng
dc.publisher.institutionUniversity of Calgaryen
dc.publisher.placeCalgaryen
dc.rightsUniversity of Calgary graduate students retain copyright ownership and moral rights for their thesis. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.
dc.titleCoordination of cat hindlimb muscles during voluntary movements
dc.typedoctoral thesis
thesis.degree.disciplineMechanical and Manufacturing Engineering
thesis.degree.grantorUniversity of Calgary
thesis.degree.nameDoctor of Philosophy (PhD)
ucalgary.item.requestcopytrue
ucalgary.thesis.accessionTheses Collection 58.002:Box 1510 520492027
ucalgary.thesis.notesUARCen
ucalgary.thesis.uarcreleaseyen
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