Individual psychometric thresholds as function of individual elbow joint torques, overall muscular activity and muscle-metric PSE.

<p><b>A)</b> Individual median (± S.E.) of net (black) and residual (gray) elbow flexion torques as function of individual psychophysical PSE (± S.E.) of those subjects that respected goodness of fit criteria and joint torques were extracted. Residual torque values were obtained by removing the gravitational component from the total net torque. Negative torques indicate downward resultant joint torque. Positive values represent resultant upward joint torques. Continuous lines and <i>r</i> values are the best fitting regression line and the resultant Pearson correlation through the data points, respectively. <b>B)</b> PSE values as function of individual overall muscular activity calculated by extracting the median of the sum of the normalized MAV value among muscles at each trial for all subjects showing <i>R² merged ></i> 0.5. Negative values indicate main flexor overall muscular activity, while positive represent overall extensor activity. Pearson correlation and best fitting regression line were extracted excluding subject 12 and 13. <b>C)</b> Correlation among individual psychophysical PSE (± S.E.) and PSE (± S.E.) extracted from muscle-metric curve (same data as in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0152552#pone.0152552.g004" target="_blank">Fig 4</a>). In all plots, <i>r</i> values represent statistically significant Pearson correlation (<i>p</i>< 0.05).