Figure 3.

Onion-skin (firing rate versus recruitment threshold force) regression slope as a function of muscle contraction levels. (A) Onionskin regression slope on the affected side at different muscle contraction levels of individual subjects. One color represents an individual subject. (B) Onion-skin regression slope on the contralateral side at different muscle contraction levels of individual subjects. (C) Onion-skin slope comparisons between the affected and the contralateral muscles. The solid lines represent the average slopes across all subjects and the shaded region represents the standard error. (D) Regression R² comparisons between the affected and the contralateral muscles. Error bars represent standard errors.