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dc.contributor.advisorAskew, Thomas R., 1955-
dc.contributor.advisorThelen, Darryl G.
dc.contributor.authorLoftin, G. Matthew
dc.description36 p.en_US
dc.description.abstractThe project I participated in involved the development of a direct-dynamics model to realistically simulate human movement. The model consisted of a multi-segmented representation of the body with Hill-type musculo-tendon actuators across the joints to accurately reproduce muscle power and torque. My exclusive role was to help validate/improve the model by generating simulations and comparing them with experimental data obtained from human subjects during strength exercises. Through my adjustments to muscle characteristics of the model, I was able to closely reproduce the joint torque vs. joint angle curves created across the hip joint during specific movements. The model parameters of the Hill-type musculo-tendon model were then adjusted to reflect changes in muscle mechanics that occur with aging. Adapting the muscle model for older adults (-70 years old) involved: 1) Decreasing muscle cross-sectional areas, maximum stress capability of the muscle, and maximum contraction velocity; 2) Slowing muscular deactivation; 3) Increasing the relative force capacity during lengthening contractions. The resulting model predicted diminished hip strength, power development, and slowed torque development that were in agreement with experimental observations of healthy older adults. This musculo-tendon model can then be used in direct-dynamics simulations to predict how age-related changes in muscle may impact the abilities of old adults to perform tasks requiring rapid movements and/or substantial strength.en_US
dc.description.sponsorshipDepartment of Physics and Engineering, Hope College, Holland, MI
dc.relation.ispartofKalamazoo College Physics Senior Individualized Projects Collection
dc.relation.ispartofseriesSenior Individualized Projects. Physics.;
dc.rightsU.S. copyright laws protect this material. Commercial use or distribution of this material is not permitted without prior written permission of the copyright holder. All rights reserved.
dc.titleAdaptation of a Dynamic Muscle Mechanics Model to Simulate Movement in Young and Old Adultsen_US
KCollege.Access.ContactIf you are not a current Kalamazoo College student, faculty, or staff member, email to request access to this thesis.

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  • Physics Senior Individualized Projects [323]
    This collection includes Senior Individualized Projects (SIP's) completed in the Physics Department. Abstracts are generally available to the public, but PDF files are available only to current Kalamazoo College students, faculty, and staff.

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