Fig. 7. EMG patterns (means ± 1 S.E.M.) for the triceps and vastus as a function of speed on the incline (black) versus the level (gray; Hoyt et al., 2005). (A) On an incline at low speeds, EMG activity of both muscles started near the time of foot contact, but as speed increased the muscle was activated earlier. (B) As speed increased on the incline, EMGs of both muscles were active for a smaller percentage of stance, but for a larger fraction than at the same speed on the level. (C) Integrated EMG activities of both muscles increased with speed and were greater on the incline.