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Fig. 7. Force-length characteristics of fully dissected rat medial gastrocnemius
(GM) muscle with only the neuro-vascular tract as extramuscular connective
tissue. GM had been dissected free from extramuscular tissues except for its
innervation, blood supply and associated connective tissues. (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.