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An isovelocity dynamometer method to determine monoarticular and biarticular muscle parameters.
MedLine Citation:
PMID:  23348140     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
This study aimed to determine whether subject-specific individual muscle models for the ankle plantar flexors could be obtained from single joint isometric and isovelocity maximum torque measurements in combination with a model of plantar flexion. Maximum plantar flexion torque measurements were taken on one subject at six knee angles spanning full flexion to full extension. A planar three-segment (foot, shank and thigh), two-muscle (soleus and gastrocnemius) model of plantar flexion was developed. Seven parameters per muscle were determined by minimizing a weighted root mean square difference (wRMSD) between the model output and the experimental torque data. Valid individual muscle models were obtained using experimental data from only two knee angles giving a wRMSD score of 16 N m, with values ranging from 11 to 17 N m for each of the six knee angles. The robustness of the methodology was confirmed through repeating the optimization with perturbed experimental torques (±20%) and segment lengths (±10%) resulting in wRMSD scores of between 13 and 20 N m. Hence, good representations of maximum torque can be achieved from subject-specific individual muscle models determined from single joint maximum torque measurements. The proposed methodology could be applied to muscle-driven models of human movement with the potential to improve their validity.
Authors:
Filipe Conceição; Mark A King; Maurice R Yeadon; G C Lewis M; Stephanie E Forrester
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of applied biomechanics     Volume:  28     ISSN:  1065-8483     ISO Abbreviation:  J Appl Biomech     Publication Date:  2012 Dec 
Date Detail:
Created Date:  2013-01-25     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9315240     Medline TA:  J Appl Biomech     Country:  United States    
Other Details:
Languages:  eng     Pagination:  751-60     Citation Subset:  IM    
Affiliation:
Sports Faculty, University of Porto, Porto, Portugal.
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