Fig. 2From: Does movement matter in people with back pain? Investigating ‘atypical’ lumbo-pelvic kinematics in people with and without back pain using wireless movement sensorsFlexion relaxation ratio definition and calculation. The flexion relaxation ratio is calculated by dividing EMG activity while the subject is fully flexed for 3 s (numerator) by the sum of EMG activity in the eccentric plus concentric phases of flexion (denominator)Back to article page