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Fig. 8. Effects of muscle relative position of fully dissected in situ rat
medial gastrocnemius (GM) muscle on force. Muscle relative position was
manipulated by moving the origin 3 mm proximally or distally from the
reference position (i.e. the position corresponding to a knee angle of
120°). (A) Active force-length characteristics after moving the origin in
the proximal direction. (B) Passive force-length characteristics after moving
the origin in the proximal direction. (C) Active force-length characteristics
after moving the origin in the distal direction. (D) Passive force-length
characteristics after moving the origin in the distal direction. Proximal and
distal forces (mean ± S.E.M.) are
represented by closed and open symbols, respectively. Muscle-tendon complex
length (Lm+t) is expressed as deviation from optimum
length (L0).