Muscle Performance. Muscle Characteristics Irritability –ability to respond to a stimulus...
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Transcript of Muscle Performance. Muscle Characteristics Irritability –ability to respond to a stimulus...
![Page 1: Muscle Performance. Muscle Characteristics Irritability –ability to respond to a stimulus Conductivity –propagate a stimulus Adaptability –ability to.](https://reader035.fdocuments.in/reader035/viewer/2022080914/56649d005503460f949d3164/html5/thumbnails/1.jpg)
Muscle Performance
![Page 2: Muscle Performance. Muscle Characteristics Irritability –ability to respond to a stimulus Conductivity –propagate a stimulus Adaptability –ability to.](https://reader035.fdocuments.in/reader035/viewer/2022080914/56649d005503460f949d3164/html5/thumbnails/2.jpg)
Muscle Characteristics
• Irritability– ability to respond to a stimulus
• Conductivity– propagate a stimulus
• Adaptability– ability to change structure
• Contractility– ability to modify length (shorten)
![Page 3: Muscle Performance. Muscle Characteristics Irritability –ability to respond to a stimulus Conductivity –propagate a stimulus Adaptability –ability to.](https://reader035.fdocuments.in/reader035/viewer/2022080914/56649d005503460f949d3164/html5/thumbnails/3.jpg)
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
![Page 4: Muscle Performance. Muscle Characteristics Irritability –ability to respond to a stimulus Conductivity –propagate a stimulus Adaptability –ability to.](https://reader035.fdocuments.in/reader035/viewer/2022080914/56649d005503460f949d3164/html5/thumbnails/4.jpg)
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
![Page 5: Muscle Performance. Muscle Characteristics Irritability –ability to respond to a stimulus Conductivity –propagate a stimulus Adaptability –ability to.](https://reader035.fdocuments.in/reader035/viewer/2022080914/56649d005503460f949d3164/html5/thumbnails/5.jpg)
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
![Page 6: Muscle Performance. Muscle Characteristics Irritability –ability to respond to a stimulus Conductivity –propagate a stimulus Adaptability –ability to.](https://reader035.fdocuments.in/reader035/viewer/2022080914/56649d005503460f949d3164/html5/thumbnails/6.jpg)
Force-Velocity Relationship of Muscle Contraction
• The amount of force generated by muscle is dependent on the velocity of contraction.
![Page 7: Muscle Performance. Muscle Characteristics Irritability –ability to respond to a stimulus Conductivity –propagate a stimulus Adaptability –ability to.](https://reader035.fdocuments.in/reader035/viewer/2022080914/56649d005503460f949d3164/html5/thumbnails/7.jpg)
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