The biarticularity of the gastrocnemii muscles provides relevant mechanisms for managing drop-like gait perturbations in humans

This study investigated the ankle-to-knee and knee-to-ankle joint energy transfer via the biarticular gastrocnemii muscles during unpredictable and adapted drop-like gait perturbations to understand how biarticular mechanisms of the gastrocnemii contribute to the mechanical work performed by the Achilles tendon (AT) force at the ankle joint. This has been done by measuring AT elongation and quantifying AT force as an indicator of the triceps surae muscle forces, as well as the body kinematics an