Activity Analysis of the Upper Extremity and Trunk.
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Transcript of Activity Analysis of the Upper Extremity and Trunk.
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Activity Analysis of the Upper Extremity and Trunk
Kinesiology Laboratory 6:
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1. Presentation of Lower Extremity Exercises
2. Vectors
3. Activity Analysisa. Baseball Swing [Leading Arm]
Today’s Activities
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Remember to pay attention and TAKE NOTES
These exercises will be on the FINAL PRACTICAL
Presentations
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Force vectors give the magnitude and direction of muscle and joint force needed to move a load. They also have two key components, a point of application and line of action.
• Magnitude (how much force) is designated by the length of the vector
• Direction (of force) is designated by the direction of the arrow
• Point of application is where the force is applied (typically the center of the muscle’s attachment)
• Line of action is the infinite line at which the force is acting.
Vector Analysis
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Vector Components
Hamill & Knutzen, 2009
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When looking at muscle vectors in two dimensions (i.e. on one plane) it is the result of two components• Horizontal Component:• Stabilizing component: degree of parallel forces
generated on the lever (bone and joint) when the muscles angle of pull is less than 90 degrees.
• Dislocating component: degree of parallel forces generated on the lever (bone and joint) when the muscle's angle of pull is greater than 90 degrees.
• Vertical Component/ Rotary Component: • Force of a muscle contributing to bone's movement
around a joint axis; greatest when muscles angle of pull is perpendicular to bone (i.e. 90 degrees).
2-Dimensional Vectors
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1. Begin at the axis
2. Draw the Horizontal component
- Parallel to Lever
- Start at muscle insertion
90˚ all rotary (movement force)
> 90˚ Dislocating (force generated away form joint)
< 90˚ Stabilizing (force generated towards joint)
3. Draw Vertical Component
- Perpendicular to Horizontal Component
- Start at muscle insertion
4. Draw vectors ONLY long enough to make a perpendicular angle to the resultant vector.
Drawing Muscle Vector Components
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Start With Resultant Vector
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Mark the length of Horizontal Component
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Draw Horizontal Component
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Draw Vertical Component
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Example of Vectors at Different Points of a Bicep Curl
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Example of Vectors at Different Points of a Bicep Curl
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Lever Review
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Lever Review
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Lever Review
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Lever Review
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Lever Review
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Lever Review
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Break the Baseball Bat Swing into 3 Phases:
1. Wind Up
2. Swing
3. Deceleration
http://www.youtube.com/watch?v=7JSMEOv4dXQ&feature=fvwrel
Activity Analysis
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Baseball Swing
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Lab Report 6
Readings: TG: pp 311-321, 326-329, 332 (not palpation)
For Next Week