Fig. 1
From: Muscles adaptation to aging and training: architectural changes – a randomised trial
Regression equations obtained from the muscles of the quadriceps in young (a, c, e, g) and old (b, d, f, h) groups. Values are relative to maximum anatomical cross sectional area (ACSA) and muscle length. 0% of relative length corresponds to distal end (knee proximity) and 100% corresponds to proximal end (hip proximity). a, b: Vastus Lateralis (VL), c, d: Vastus Intermedius (VI), e, f: Vastus Medialis (VM) and g, h: Rectus Femoris (RF)