Assessment of the lumbar muscle co-contraction in trunk flexion and bending movements at different velocities, using time-varying muscle synergies - Bagheri Rouchi, Mahdi; Davoudi, Mehrdad; Meftahi, Narges; Rashedi, Ehsan; Khalaf, Kinda; Parnianpour, Mohamad (Gait & posture, 2023)