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Fig. 2. (A) Schematic diagram of single joint structures crossing plantar and
dorsal aspects of the ankle and the gastrocnemius crossing both ankle and
knee. Passive ankle torque is assumed due to resistive forces from these
structures. (B) Raw data of passive ankle torques when the ankle was rotated
from full plantarflexion to full dorsiflexion from one subject measured at
four of the eight different knee angles (0°, 20°, 70° and
100°). Differences in torque-angle relations are assumed to reflect
changes in the length of the gastrocnemius (see Materials and methods).
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