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The results of ultrasound measurements of the right quadriceps (A–C), questionnaires (D, E) and 6MWD (F) in the study population.
Abbreviations: 6MWD, 6-minute walk distance; EI, echo intensity; FACITF, functional assessment of chronic illness therapy fatigue; GOLD, Global Initiative for Chronic Obstructive Lung Disease; PCS, physical component summary; QMT, quadriceps muscle thickness; RFcsa, rectus femoris cross-sectional area.
