Figure 6.

The probability of a stimulation pulse eliciting an H-reflex depends on the time since the motor unit last fired. (A) As shown for a single motor unit, the time since the previous motor unit discharge was measured for each stimulation pulse, and termed the “after firing period”. It was then determined whether this stimulation pulse elicited an H-reflex. (B) Across subjects, the probability of a stimulation pulse eliciting a motor unit H-reflex was calculated for each 1 ms after firing period increment.