Figure 6
From: Role of compliant mechanics and motor control in hopping - from human to robot

Comparison of human and robot leg joint angles (during a hopping cycle). In both (a) Human and (b) Robot hopping, the range of motion in all leg joints decreases with increasing hopping frequency. The average data of all subjects for each frequency is shown. The robot data is the average value for each frequency. The Small circles indicate the take-off moments.