Fig. 4From: Biomechanical walking mechanisms underlying the metabolic reduction caused by an autonomous exoskeletonJoint angle profiles. The angle trajectories of the ankle, knee and hip are shown over a gait cycle that begins and ends with heel strike of the same leg. Increasing angles represent dorsiflexion at the ankle, flexion at the knee, and flexion at the hip. The trajectories are intersubject means. The grey solid lines represent the no exoskeleton condition; dark blue dashes represent the powered-off exoskeleton condition, and the red dots represent the active exoskeleton condition. The standard error means are shown with light shading of the same colorBack to article page