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Percentage change from baseline in ultrasound and DEXA measured indices of quadriceps mass in (a) COPD, and (b) Healthy. Data presented as Means (SEM) RFcsa: Rectus femoris cross-sectional area measured by ultrasound, Qt: Quadriceps muscle thickness measured by ultrasound, Tdexa: Thigh lean mass measured by DEXA, Wilcoxon Signed rank test: *** p ≤ 0.0001; ** p < 0.001; * p < 0.01, significantly different from baseline.
