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. Author manuscript; available in PMC: 2010 Feb 10.
Published in final edited form as: IEEE Trans Neural Syst Rehabil Eng. 2009 Feb;17(1):31. doi: 10.1109/TNSRE.2008.2008285

Figure 9.

Figure 9

Positive and negative exoskeleton mechanical work (J/kg) averaged across 9 subjects (black dots) +/− 1 SD (grey area). Positive mechanical work stays constant over day 1 and day 2 while there is a substantial decrease in exoskeleton negative work on both day 1 and day 2. The horizontal black lines show +/− 2 standard deviations of group mean data from the last 15 min of day 2, representing steady state dynamics. These steady state envelopes are calculated from group mean data and are for display purposes only. Individual subject analyses were used for statistical tests.