Saskia Baltrusch

98 Chapter 4 lifting with the exoskeleton from knee height (p=0.050). M. external oblique significantly increased in activity when lifting with the exoskeleton from ankle height (p=0.042). Post-hoc analysis suggested that this latter main effect derives from a difference in activity between low cam and control condition, although it did not reach significance. We did not find any effects of the exoskeleton on muscle activity in the upper legs. Figure 5: The amplitude of the center of mass when lifting from knee and ankle height, averaged over all participants (a). Highest position of the center of mass when lifting from knee and ankle height, averaged over all participants (b). Lowest position of the center of mass when lifting from knee and ankle height, averaged over all participants (c). N=11. Error bars indicate standard deviations.