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(A) Muscle force-length curve in a Hill-type muscle model normalized to optimal fiber length. The curve becomes more flat when muscle fiber length is close to optimal fiber length (around 0.8 ~ 1.1 optimal fiber length). (B) Normalized muscle fiber length over a gait cycle for BFSH and RF. Normalized BFSH muscle fiber length (solid line) ranged from 0.85 to 1.0. RF (dashed line) operated on its normalized muscle fiber length curve from 0.75 to 1.25. 126×192mm (600 × 600 DPI)
