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Fig. 3. Humeral retractor muscle recruitment profiles for individual brown lemur
(A13) and red-belly lemur (B1,2) subjects. As in
Fig. 2, step-cycle lengths have
all been equalized for ease of comparisons. Each support phase begins with
hand touchdown and ends with hand lift-off. Each swing phase begins with hand
lift-off and ends with hand touchdown. The magnitude of the RMS values are
shown as a percentage of the maximum level of activity observed during a
recording session, with 100% of the maximum burst equal to the top of the box
along the y-axis. Blackened areas represent the most consistent
activity, occurring in 75% or more of the step cycles, and the gray shaded
areas represent more variable activity occurring at least 50% of the time.