Figure 2
From: Muscle-driven simulations and experimental data of cycling

Simulation results of the mean joint angle ± 2 SD of the right leg for each rotational DOF. TDC denotes top dead center and BDC denotes bottom dead center of the crank cycle. Positive angles denote hip flexion, hip adduction, hip internal rotation, knee flexion, and ankle dorsiflexion. Pelvis tilt, list, and rotation are defined as rotation about the medial–lateral, anterior–posterior, and superior-inferior axes of the pelvis, respectively, and the positive directions of the axes of rotation for tilt, list, and rotation, are right, anterior, and superior in the pelvis reference frame.