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Fig. 6. Force-length characteristics of partially dissected rat medial gastrocnemius (GM) muscle connected only at the level of the muscle belly by extramuscular connective tissue (i.e. remnants of the general fascia and epimysium). (A) Active forces exerted at the proximal tendon (closed symbols) and at the distal tendon (calcaneal bone) (open symbols). (B) Passive forces exerted at the proximal tendon (closed symbols) and at the distal tendon (calcaneal bone) (open symbols). Muscle-tendon complex length (Lm+t) is expressed as deviation from optimum GM muscle-tendon complex length (L0). Force is shown as mean ± S.E.M.