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Muscle Performance

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 Performance

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  1. Muscle Performance

  2. Muscle Characteristics • Irritability • ability to respond to a stimulus • Conductivity • propagate a stimulus • Adaptability • ability to change structure • Contractility • ability to modify length (shorten)

  3. 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

  4. 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

  5. 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

  6. Force-Velocity Relationship of Muscle Contraction • The amount of force generated by muscle is dependent on the velocity of contraction.

  7. 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

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