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Muscle Performance - PowerPoint PPT Presentation


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Muscle Performance. Muscle Characteristics. Irritability ability to respond to a stimulus Conductivity propagate a stimulus Adaptability ability to change structure Contractility ability to modify length (shorten). Muscle Contraction. Isometric: No change in muscle length

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muscle characteristics
Muscle Characteristics
  • Irritability
    • ability to respond to a stimulus
  • Conductivity
    • propagate a stimulus
  • Adaptability
    • ability to change structure
  • Contractility
    • ability to modify length (shorten)
muscle contraction
Muscle Contraction
  • Isometric: No change in muscle length
  • Isotonic: Change in length (same external weight)
    • Concentric: muscle length shortens during contraction
    • Eccentric: muscle length increases during contraction
  • Isokinetic: Angular speed is constant during contraction
    • Concentric
    • Eccentric
role of muscle p170
Role of Muscle (p170)
  • Agonist: (prime mover) functions to cause a movement
  • Antagonist: functions to resist movement
  • Stabilizer: functions to fixate an area so another movement can occur
  • Synergist: assist another muscle
  • Neutralizer: functions to prevent undesired movement
length tension relationship of muscle contraction
Length-Tension Relationship of Muscle Contraction
  • The amount of force generated by a muscle is dependent on length of muscle.
  • Muscles that cross two joints
    • concurrent movements at both joints not maximized
force velocity relationship of muscle contraction
Force-Velocity Relationship of Muscle Contraction
  • The amount of force generated by muscle is dependent on the velocity of contraction.
summary
Summary
  • Muscle characteristics
  • Types of contraction
    • isotonic, isometric, isokinetic, concentric, eccentric
  • Role of muscle
    • agonist, antagonist, synergist, stabilizer, neutralizer
  • Muscle force dependent on
    • length-tension relationship
    • force-velocity relationship