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The flashcards below were created by user
pugsrule915
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Unit 5 Purpose-
determine the avg motor nerve fiber conduction velocity under two dif temps
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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)
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Unit 5 Ice Procedure
- Forearm in plastic bag, ice on top for 30 min
- Ulnar nerve stim at elbow wrist
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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
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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
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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
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direction of biceps force
up
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direction of load force
down
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φ
biceps force and lever arm A
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θ
load force and lever arm B
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Lever arm A
- Load arm
- load force to axis of rotation (elbow joint)
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Lever arm B
- effort arm
- length from biceps tendon to axis of rotation
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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
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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
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Unit 6 Human setup protocol
- 3 restraining strap positions
- 3 MVC with 5 min rest, holding forearm at 90° (angle theta)
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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
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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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