Fig. 6. The relationship between stiffness (N/% strain) and muscle-tendon unit (MTU) length for each of the five segments defined in this study; for definitions of abbreviations, see Fig. 5. Tendon stiffness was greater than that of all regions of the aponeurosis and did not vary significantly with increasing MTU length. The stiffness of the aponeurosis was relatively constant across lengths but was significantly (P<0.05) higher at L_o+2 mm than at any other length. Values are means ± 1 S.D. (N=4).