Figure 5.

Displacement of and strains in aponeuroses during passive lengthening

A, distal displacement of the centroid of the superficial aponeurosis. B, distal displacement of the centroid of the deep aponeurosis. C, difference in the distal displacements of the centroids of the superficial and deep aponeuroses. D, longitudinal strain of the superficial aponeurosis. E, longitudinal strain of the deep aponeurosis. F, muscle thickness. Each of the thin lines in each panel represents data from a single muscle. The heavy line is a lowess smoothed curve fitted through all data between 20% and 60% of the in vivo range of muscle lengths.