Kinetic and Kinematics Flashcards
3 methods of gait measurement
1) kinetics
2) kinematics
3) spatial temporal
2- D gait analysis is able to measure
- ROM
- GRF
- Power and moments
tools for 2 D gait analysis
- zynomat
- one camera
Zeno mat with protokinetics Software
- GAME lab 2 D analysis
- provides spatial-temporal output and kinematics
- visual video of foot prints
3 D motion capture is able to measure
- position
- velocity
- accelertion
- GRF
- joint moments
- powers
- both kinetics and kinematics
kinetics refers to
1) ground reaction forces
2) moments
3) power
ground reaction forces
external force
moments
- force to cause a rotation around a joint axis
- internal or external moments
power
- measured in watts
- force times time
- concentric vs eccentric
- 3 D gait analysis
internal moments are created by
contraction of the muscle, joint ligaments (restraint), and fascia/joint capsule (elastic properties)
- purpose is to counteract the external moments
- measures in newtons/ body weight
external moments are created by
landing on a surface (GRF)
in walking each joint creates a moment to either
1) stabilize and control
2) produce movement
extensor moments
support for body on surface
ex: gastroc/soleus, quads
flexor moments
pull away from the surface
ex: iliopsoas, DF
where in the gait cycle are GRF the most
LR and Heel off