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Fig. 3. Ultrasound images of the gastrocnemius medialis (GM) at rest, at 50% of the
maximum voluntary contraction (MVC) and at the plateau of the MVC. The
elongation of the tendon and aponeurosis was examined at the GM muscle belly
at about 50% of its length. The displacement of the analysed cross-point in
relation to the skin marker was defined as measured elongation of the tendon
and aponeurosis.