Muscle Mechanics

  • Describe the effect of fiber direction, cross-sectional area, and fiber length on muscle force
  • Distinguish between the various types of muscle fiber for endurance and speed
  • Describe the three types of muscle activations
  • Calculate stress and strain for muscles

 What is strength?
Frankie FredericksLeroy Burrell
Bernard Lagat
T = F⊥d

Factors affecting force production
  • Cross-sectional Area
  • Muscle Design
  • Myofibril Organization
  • Fiber Length
  • Contraction Velocity
  • Fiber Type
    • (1) slow twitch fatigue resistant (I), (2) fast twitch fatigue resistant (IIa), (3) faster twitch fatigue resistant (IIx), and (4) fastest twitch fast fatigue (IIb).
  • Neuromuscular Factors
Tendons and Ligaments
  • 70% water
  • 25% collagen
  • 5% elastin
  • Traces of inorganic components

Fiber Arrangement Stress Strain