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Rectus femoris (RF) ultrasound images from one representative subject, obtained by the same rater (R1) at two different days and at the two different muscle sites: (a) image obtained by R1 on the first day on RF50 site; (b) image obtained by R1 on the first day on RF70 site; (c) image obtained by R1 on the second day on RF50 site; (d) image obtained by R1 on the second day on RF70 site. Echo intensity values are presented in arbitrary units (a.u.).
