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Abstract #5143

Variation of Strain Rate with Force Output in the Medial Gastrocnemius During Isometric Contractions in Young and Senior Subjects

Shantanu Sinha1, Vadim Malis2, and Usha Sinha3

1Radiology, UC San Diego, San Diego, CA, United States, 2Physics, UC San Diego, La Jolla, CA, United States, 3Physics, San Diego State University, San Diego, CA, United States

Strain rate tensor mapping can be conveniently computed from velocity encoded phase contrast imaging. It provides a tool to explore local tissue deformations including the magnitude and directions of the principal axes of deformations. The study of the variation of strain rate indices with force output (% Maximum Voluntary Contraction (MVC) can provide additional information similar to stress-strain relationships measured at the whole muscle level. Here, we present the methodological developments to extract 2D Strain rate indices as a function of %MVC in 6 normal young (3) and senior (3) subjects. An approximately linear variation of SR indices with %MVC force was seen in the range of 20-50% MVC in young and senior subjects.

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