Are Torque-Driven Simulation Models of Human Movement Limited by an Assumption of Monoarticularity?

Subject-specific torque-driven computer simulation models employing single-joint torque generators have successfully simulated various sports movements with a key assumption that the maximal exerted at joint is function of kinematics alone. This study investigates effect on model accuracy or two-joint generator representations within whole-body simulations squat jumping and countermovement jumping. Two eight-segment forward dynamics subject-specific rigid body five joints are constructed—the first includes lower limb torques, calculated solely from generators, second generators. Both used to produce matched jump by varying activation timings in each model. The jumps measured performances more closely (6% 10% different, respectively) than (10% 24% respectively). Our results show performed better for upward phase matching faster velocities achieving comparable amounts extension. submaximal descent was similar two (9% difference). In conclusion, representation likely be appropriate simulating dynamic tasks requiring large torques near-maximal velocities.