lifting considerations

Question 1

lifting considerations

work and power:
what is work?

Answer 1

work = the product of force and the distance throug hwhich taht force acts

Question 2

lifting considerations

what are the 3 equations for work and power

1 work, 2 power

Answer 2

work = force x distance
power = work/time
or
power = force x velocity

to produce a higher power time needs to be smaller/shorter

Question 3

lifting considerations

load and torque definitions

Answer 3

load = a force that acts on the body
torque = a force that rotates a body orsegment around an axis of rotation

Question 4

lifting considerations

what is the equation for torque

Answer 4

torque = load x moment arm

force/load interchangeable

Question 5

lifting considerations

what are the 4 types of lifts?

Answer 5

1. squat lift
2. stoop lift
3. golfers lift
4. power lift

Question 6

lifting considerations

talk about squat lift

Answer 6

uniform flexion of hips and knees
dorsiflexion at the ankles
moment arm @ hips would be greater if it wasnt for flexed knees
requires less torque from hip muscles due to flexed knees

Question 7

lifting considerations

talk about stoop lift

Answer 7

more hip flexion less knee flexion
> moment arm between object being lifting and force of gravity
more toque @ hip muscles
see this lift with lighter loads
patient population seen with knee pathologies
there is regional interdependence on knee shift to the hips
concurrent lumbar movement into flexion with hips

Question 8

lifting considerations

talk about golfers lift

Answer 8

lift used for very small loads
> torque requirement
alot of uniolateral hip stabilty
allows more isolated hip flexion with limited lumbar flexion - this is due to rotation @ the femroacetabular joint

Question 9

lifting considerations

talk about power lift

Answer 9

each lower extremity is put in a differnet length tension
allows load to be closer to AOR @ hips
decreases moment arm, decreased required torque

Question 10

lifting considerations

list the 6 general rules for lifting

Answer 10

1. decrease the amout of external load
2. decrease velocity of the lift (F=ma)
3. minimize twisting (torsional force)
4. decrease distance of the laod to center of mass (external moment arm)
5. increase muscle strength (internal moment)
6. seek assistance