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Abstract #4943

2D Fiber Strains Correlated to DTI in the Medial Gastrocnemius under Isometric Contractions at Different Foot Positions

Brandon Cunnane1, Usha Sinha1, Vadim Malis2, Ryan Hernandez1, John Hodgson3, and Shantanu Sinha2
1Physics, San Diego State University, San Diego, CA, United States, 2Radiology, UC San Diego, San Diego, CA, United States, 3Inteegrative Biology and Physiology, UC Los Angeles, Los Angles, CA, United States

Synopsis

Study of muscle fiber strains at different foot positions can reveal the dependence of muscle force on muscle architecture. Prior studies of isometric contraction in calf muscle using dynamic MRI revealed in the medial gastrocnemius (MG), strain heterogeneity along and across fibers, constant in-plane areas, and gear ratios decreasing with unloading. This study examines correlation of fiber strains in the MG at three-foot positions and two sub-maximal isometric contractions with fiber directions extracted from DTI. The plantarflexed foot position had the highest normalized fiber strain (to force and to torque) while the dorsiflexed position had the lowest normalized fiber strains.

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