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A. Trunk Stability Test (TST). B. Lab-based biomechanical test of isolated core stability. The lab-based test reduces influence of the lower extremities by strapping the legs together and supporting the feet on the footplate that is attached to the chair thereby eliminating control of the chair through the lower extremities. The TST requires the same trunk and arm position as the lab-based test; however, one foot is allowed to remain in contact with the floor.
