Chapter 2
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function of a synergist
indirectly assists in movement
definition of torque
degree to which force rotates object around fulcrum
what is a first class lever
force-fulcrum-resistive force
example of a first class lever
elbow extension
what is a second class lever
force-resistive force-fulcrum
example of a second class lever
plantar flexion
what is a third class lever
fulcrum-applied force-resistive force
example of a third class lever
elbow flexion
to be at mechanical advantage…
the force must be greater then the resistance
what is a mechanical advantage
> 1.0
what is mechanical disadvantage
<1.0 -> MC
definition of acceleration
change in velocity per unit time
what is work
force x displacement
what is power
work / time; “explosive strength”
what is positive work
concentric contraction
what is negative work
eccentric contraction
what is recruitment
of motor units involved in contraction
what is rate coding
rate at which a motor unit is fired
what action is concentric
lifting movement
what action is eccentric
lowering movement
what is isometric
no movement