Figure 2From: Effects of breathing maneuver and sitting posture on muscle activity in inspiratory accessory muscles in patients with chronic obstructive pulmonary diseaseComparisons of %RVC among sitting postures. NP, neutral position; PM, pectoralis major; %RVC, percentage of reference voluntary contraction; SM, scalene muscle; SCM, sternocleidomastoid muscle; WAHS, breathing training with arm and head support; WAS, breathing training with arm support (*p < 0.05).Back to article page