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Sagittal ultrasound image used for measurements. Length‐related ultrasound image of the lateral gastrocnemius muscle used for measurement of: fibre length (LF) as the distance between the abaxial superficial aponeurosis (Sa) and the central aponeurosis (Ca), pennation as the angle between the fibre length line and that of the internal aponeurosis. Actual measurements were taken as the average of 10 measurements per subject. Left in the image is proximal, top is lateral.
