Fig. 6. Mean fascicle length change (A) of 4 subjects, mean muscle–tendon complex (MTC) length change (B) and smoothed GM EMG (C) data of 10 subjects of one full descending stride cycle for standard stair descent (solid lines) and stair descent with 20% extra body weight (dotted lines). The fascicular behaviour was analyzed during touch-down (from 0 to 14% stride cycle). Vertical lines indicate foot-contact times [lift-off (LO) right, touch-down (TD) right and LO left] for both conditions, whereas 0 and 100% of the stride cycle indicate TD of the left (analyzed) foot. For clarity, only the positive standard deviations of the standard mass condition are presented.