Regional changes in gastrocnemius architecture with knee position.

Mean values and standard deviation (whiskers) are shown for the fat thickness (panel a), the MG fibre length (panel b), and their pennation angle (panel c). These values were obtained from panoramic ultrasound images (see Fig 5), separately for the proximal (dark, shaded bars) and distal (light, shaded bars) muscle regions. Asterisks denote statistical differences at P < 0.05.