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Understanding Upper Extremity and Trunk Activity Analysis Through Kinesiology Lab Exercises

In this lab session, we delve into the analysis of upper extremity and trunk activities with a focus on understanding vector analysis related to muscle and joint forces. Key activities include presentations on lower extremity exercises and a detailed breakdown of the baseball swing, emphasizing the leading arm's mechanics. We explore the significance of force vectors, including their magnitude, direction, point of application, and line of action, as well as how to draw and interpret 2D muscle vector components. Students are reminded to take detailed notes for their final practical assessment.

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Understanding Upper Extremity and Trunk Activity Analysis Through Kinesiology Lab Exercises

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Presentation Transcript

  1. Kinesiology Laboratory 6: Activity Analysis of the Upper Extremity and Trunk

  2. Today’s Activities • Presentation of Lower Extremity Exercises • Vectors • Activity Analysis • Baseball Swing [Leading Arm]

  3. Presentations • Remember to pay attention and TAKE NOTES • These exercises will be on the FINAL PRACTICAL

  4. Vector Analysis • 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.

  5. Vector Components Hamill & Knutzen, 2009

  6. 2-Dimensional Vectors • 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).

  7. Drawing Muscle Vector Components • 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.

  8. Start With Resultant Vector

  9. Mark the length of Horizontal Component

  10. Draw Horizontal Component

  11. Draw Vertical Component

  12. Example of Vectors at Different Points of a Bicep Curl

  13. Example of Vectors at Different Points of a Bicep Curl

  14. Lever Review

  15. Lever Review

  16. Lever Review

  17. Lever Review

  18. Lever Review

  19. Lever Review

  20. Activity Analysis • Break the Baseball Bat Swing into 3 Phases: • Wind Up • Swing • Deceleration • http://www.youtube.com/watch?v=7JSMEOv4dXQ&feature=fvwrel

  21. Baseball Swing

  22. For Next Week • Lab Report 6 • Readings: TG: pp 311-321, 326-329, 332 (not palpation)

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