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Put it all together

Put it all together. Compare muscles w /two different pcsas Draw F-L for same fiber length Draw F-V for same fiber length Compare muscle w /different fiber lengths Draw F-L, for same pcsa Draw F-V, for same pcsa. Max Force (N). Max Force (N). Muscle Length (mm).

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Put it all together

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  1. Put it all together • Compare muscles w/two different pcsas • Draw F-L for same fiber length • Draw F-V for same fiber length • Compare muscle w/different fiber lengths • Draw F-L, for same pcsa • Draw F-V, for same pcsa Max Force (N) Max Force (N) Muscle Length (mm) Muscle Velocity (mm/s)

  2. Same fiber length Different PCSA Max Force (N) Max Force (N) Muscle Velocity (mm/s) Muscle Length (mm) Different fiber length Same PCSA Max Force (N) Max Force (N) Muscle Length (mm) Muscle Velocity (mm/s)

  3. Design problem • Rectus femoris • Mass: 84 g • Fiber length: 6.6cm • Average CSA: 12.7 cm2 • Pennation Angle:5o • Semitendinosous • Mass: 76.9g • Fiber length: 15.8cm • Average CSA: 5.4 cm2 • Pennation Angle:5o

  4. Design problem • Rectus femoris • Mass: 84 g • Fiber length: 6.6cm • Average CSA: 12.7 cm2 • Pennation Angle:5o • Bicepsfemoris • Mass: 128 g • Fiber length: 8.5cm • Average CSA: 12.7 cm2 • Pennation Angle:0o • VastusLateralis • Mass: 220 g • Fiber length: 6.5cm • Average CSA: 30.6 cm2 • Pennation Angle:5o

  5. Design problem • Rectus femoris • Mass: 84 g • Fiber length: 6.6cm • Average CSA: 12.7 cm2 • Pennation Angle:5o • Bicepsfemoris • Mass: 128 g • Fiber length: 8.5cm • Average CSA: 12.7 cm2 • Pennation Angle:0o • VastusLateralis • Mass: 220 g • Fiber length: 6.5cm • Average CSA: 30.6 cm2 • Pennation Angle:5o A B C

  6. Fiber Length/Muscle Length ratio

  7. Examples of Muscle Structure/Function • Quads • High pennation angles • Large PCSAs • Short fibers • Large forces • Hamstrings • Long fibers, intermediate PCSAs • Large excursions

  8. Plantarflexors • Dorsiflexors • Dangerous generalization: • Anti-gravity extensors for force production • Flexors for high-velocity excursion • Will break down under close scrutiny

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