Fig. 4From: Specific motor cortex hypoexcitability and hypoactivation in COPD patients with peripheral muscle weaknessSlopes and y-intercepts of linear relationship between maximal voluntary quadriceps torque (QMVC) and quadriceps maximal peak twitch (QPt) in healthy controls (gray squares and gray line), COPD patients without muscle weakness (COPDNoMW) (empty circles and dotted line), and COPD patients with muscle weakness (COPDMW) (dark circles and dark line)Back to article page