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Feedback Motor Applied Force and Intramuscular Pressure. (A) Mean feedback motor applied forces for L7 spinal tissue displacements of 1, 2, 3, 5, 8, 10 mm (* p < 0.0001); (B) mean superficial and deep intramuscular pressures for L7 spinal tissue displacements of 1, 2, 3, 5, 8, 10 mm (* p ≤ 0.0002).
