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2018 IEEE International Work Conference on Bioinspired Intelligence (IWOBI): Conference Report
Open AccessArticle

Analyzing Moment Arm Profiles in a Full-Muscle Rat Hindlimb Model

Department of Mechanical and Aerospace Engineering, Case Western Reserve University, Cleveland, OH 44106-7222, USA
Department of Motion Science, Friedrich-Schiller University Jena, 07737 Jena, Germany
Department of Mechanical and Materials Engineering, Portland State University, Portland, OR 97207, USA
Author to whom correspondence should be addressed.
This article is an extended version of our paper published in Lecture Notes in Artificial Intelligence, Volume 10928, Proceedings of the 7th International Conference on Biomimetic and Biohybrid Systems, Living Machines 2018, Paris, France, 17–20 July 2018; Vouloutsi, V., Halloy, J., Mura, A., Mangan, M., Lepora, N., Prescott, T.J., Verschure, P.F.M.J, Eds. Springer Nature: 2018; Paper No. 57, pp. 527–537.
Biomimetics 2019, 4(1), 10;
Received: 7 November 2018 / Revised: 18 January 2019 / Accepted: 22 January 2019 / Published: 25 January 2019
(This article belongs to the Special Issue Selected Papers from Living Machines 2018)
Understanding the kinematics of a hindlimb model is a fundamental aspect of modeling coordinated locomotion. This work describes the development process of a rat hindlimb model that contains a complete muscular system and incorporates physiological walking data to examine realistic muscle movements during a step cycle. Moment arm profiles for selected muscles are analyzed and presented as the first steps to calculating torque generation at hindlimb joints. A technique for calculating muscle moment arms from muscle attachment points in a three-dimensional (3D) space has been established. This model accounts for the configuration of adjacent joints, a critical aspect of biarticular moment arm analysis that must be considered when calculating joint torque. Moment arm profiles from isolated muscle motions are compared to two existing models. The dependence of biarticular muscle’s moment arms on the configuration of the adjacent joint is a critical aspect of moment arm analysis that must be considered when calculating joint torque. The variability in moment arm profiles suggests changes in muscle function during a step. View Full-Text
Keywords: biomechanics; moment arm; biarticular muscles biomechanics; moment arm; biarticular muscles
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Young, F.; Rode, C.; Hunt, A.; Quinn, R. Analyzing Moment Arm Profiles in a Full-Muscle Rat Hindlimb Model. Biomimetics 2019, 4, 10.

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