Fig. 4. Representative muscle fascicle strain and activation patterns from wallaby #3 during level and incline hopping at (A,B) 3.3 and (C,D) 4.2 m s^–1. Shaded regions indicate stance phase. Muscle fascicle strain was recorded from one sight in the biceps femoris (BF) and two sights in the vastus lateralis, proximally (VL_prox) and distally (VL_dist). In general, both muscles exhibited decreased initial stretch followed by increased shortening during incline as compared with level hopping. There were no significant differences in fascicle strain due to speed. Note: the second EMG electrode in the VL (bottom trace) did not provide reliable data in these trials.