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Ultrasound muscle assessement of the rectus femoris cross-section área (A–C); the thickness of the anterior compartment of the quadriceps muscle (rectus femoris and vastus intermedius) (D–F); rectus femoris echogenicity (G–I); MRC score (J,K); and International Classification of Functioning, Disability, and Health (ICF)-muscle strength (L). aP < 0.05 compared to day 1; bP < 0.05 compared to day 5.
