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