Unit 5,6

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pugsrule915
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250960
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Unit 5,6
Updated:
2013-12-05 08:12:50
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Unit 5,6
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  1. Unit 5 Purpose-
    determine the avg motor nerve fiber conduction velocity under two dif temps
  2. Unit 5 Room Temp Procedure-
    • EMG recording electrodes on belly of 1st dorsal interosseous and MCP joint
    • Ground electrode on back of wrist
    • Ulnar nerve stimulated at wrist and elbow (cathode distally)
    • Distance between elbow and wrist cathodes measured (mm)
  3. Unit 5 Ice Procedure
    • Forearm in plastic bag, ice on top for 30 min
    • Ulnar nerve stim at elbow wrist
  4. Unit 5 Results
    • Cooling slows avg NCV bc the enzymes which dictate the rate of ATP regeneration slow down
    • which slows the Na/K pump
    • Increases time needed to generate AP
    • Decreasing the avg motor nerve fiber conduction velocity
  5. Unit 5 Graphs
    ****Cooling nerve slows NCV therefore taking longer time for the AP to reach the muscle creating delay in the appearance of the M-wave
  6. Unit 6 Purpose
    • determined the impact of changing length of lever arm on the load needed to achieve static equilibrium
    • determined the impact of changing the length of the lever arm on myometer readings during MVC (iso) biceps
  7. direction of biceps force
    up
  8. direction of load force
    down
  9. φ
    biceps force and lever arm A
  10. θ
    load force and lever arm B
  11. Lever arm A
    • Load arm
    • load force to axis of rotation (elbow joint)
  12. Lever arm B
    • effort arm
    • length from biceps tendon to axis of rotation
  13. Unit 6 Simulated Biceps Procedure
    load force placed on 3 dif positions on lever arm A to equal 90 degree angle both theta and phi
  14. Unit 6 Sim bicep Results
    • if weight increase proportionally to the degree of shortening of lever arm A
    • ---then load torques equal
    • ---muscle force values equal
  15. Unit 6 Human setup protocol
    • 3 restraining strap positions
    • 3 MVC with 5 min rest, holding forearm at 90° (angle theta)
  16. moment arm
    perpendicular distance from the pt where force exerted to the axis of rotation  bc we couldn’t measure the angle btw biceps tendon and axis of forearm
  17. Unit 6 hum bic Results
    • weight increase proportionally to the degree of shortening of lever arm A
    • ---then myometer torques equal
    • ---muscle fore values equal

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