Figure 1
From: Operating length and velocity of human vastus lateralis muscle during walking and running
Ultrasound-based determination of vastus lateralis muscle fascicle length. (a) The ultrasound transducer was carefully attached on the muscle belly by means of a customised neoprene elastic cast. (b) A semi-automatic frame-by-frame tracking procedure was used to identify visible features of multiple fascicles (F) located between the manually traced upper (uA) and deeper (dA) aponeurosis. A representative reference fascicle (rF) was then calculated on the basis of the identified fascicle portions to assess fascicle length as the Euclidian distance between the insertion points with the two aponeurosis.
