Figure 2
From: The effects of poliomyelitis on motor unit behavior during repetitive muscle actions: a case report
Plotted mean firing rate (MFR) versus recruitment threshold (expressed relative to% maximal voluntary contraction [MVC]) relationships from the VL for the healthy (HE) (subject 1 – black circular markers, subject 2 – empty black circular markers, subject 3 – grey circular markers; solid linear regression lines) and polio (PO) participants (grey triangular markers; dashed regression line) during the 1st, 10th, and 20th repetitive contraction at 50% MVC. From repetition 1 to 20, HE experienced a greater decrease in y-intercepts (12.86%) than PO (1.50%).