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How muscle function changes with frequency in vertical human hopping 1. Tell us about you: - Craig McGowan, Anne Gutmann – Comparative Neuromuscular Biomechanics Lab University of Idaho 2. Big Picture Motivation: The specific aims of the project are to determine muscle-tendon dynamics and metabolic energy use for individual leg muscles across a wide range of hopping frequencies. Based on ultrasound data which show that humans hold their gastrocnemius muscle nearly isometric when hopping at 2 hops s-1, we hypothesize that humans prefer to hop at a frequency that minimizes muscle work by maximizing the elastic energy stored and returned by the proximal tendons of the legs and feet and that this, in turn, minimizes metabolic cost/height at the preferred hopping frequency. 3. Workshop Goal: - Create a 2-D simulation of vertical human hopping for one hopping frequency using the standard human model available in OpenSim. - Analyze the muscle-tendon dynamics and metabolic energy use of individual muscles using metabolic probes. OpenSim Workshop August 2013