Abstract
Upper arm function during a tracking task is recognized as non-linear and characterized by a phase plane with acceleration (second derivative of stick position) plotted on the ordinate and velocity (first derivative of stick position) plotted on the abscissa. An acceleration time constant (/spl tau//sub A/) is defined as [V/sub A//A/sub M/] where V/sub A/ is the velocity at maximal acceleration and AM is the actual maximal acceleration. Ten spastic subjects (S) were categorized into 3 groups of mildly spastic (M), intermediately spastic (I), and highly spastic (H) which were compared to 5 normal subjects (N). When performing a commanded movement, T/sub A/ is a significant identifier between M, I and H. Specifically, T/sub A/ for M is highest, T/sub A/ for I is intermediate, and /spl tau//sub A/ for H is lowest. There is no significant difference between /spl tau//sub A/ for H and /spl tau//sub A/ for N. The physical significance of these results is discussed.
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