Figure 1

Data from a typical experimental trial. (A) Knee angle recorded for an entire day of activity on Earth for Subject 1. Specific sections depicting walking, running, and sitting are indicated. Zero degrees indicates full knee extension. (B) Detailed view of a 4s section of the above data demonstrating an excursion event. A transition from an extension excursion to flexion was detected when the change in angular direction exceeded a 3° fluctuation.