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The duration of impaired modulation vs. the recruitment threshold for 51 motor unit pairs in the spastic-paretic muscle, 47 motor unit pairs in the contralateral muscle, and 44 motor unit pairs in the control muscle. ●, Lower-threshold motor units; ○, higher-threshold motor units. Note the longer duration of impaired modulation for both lower- and higher-threshold motor units in spastic-paretic muscle than contralateral or control muscle.
