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Spatial dependency of paraspinal muscle activity was assessed using a new two-dimensional MMG recording system. MMG signals were detected over the left and right paraspinal muscles of 10 volunteers using a grid of 12 accelerometers. During two separate trials subjects maintained a 20° flexed position and held loads that ranged from 0 to 15kg (in 2.5kg increments) for 20s; and 7.5kg for 6min. Maps...