Figure 4. Average number of discharges per motor unit per second.

The average number of discharges per motor unit per second, which is an estimate of the neural drive to the muscle (DR_MEAN, pps) and the explosive contractions (in percentages of maximal voluntary force) when averaged across subjects. The dotted lines correspond to the mean and the edges of the shaded plot indicate the SD. The peak of the neural drive corresponding to the initial phase of the explosive force contraction can be noted.