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FORCE ANALYSIS (ADVANCED FORCE MEASUREMENT) (Gait analysis: LOCOMOTION…
FORCE ANALYSIS (ADVANCED FORCE MEASUREMENT)
Force
1) Force plate (force)
Vector
Fy
2) Moments, Rotational force
3) Central of pressure
Ax
Ay
Construction
COP, How far away Force from 1 2 3 4
Force through cristal
More Force, more defamation, more electrical signal
A) Directions in which quartz can be sliced
B) Unloaded VS under load (Crystal)
Walking
Long distance force plate
Read Kiestler. Tight, fix force plate
GREEN
Very expensive
Terms and Definitions/ Technical Spec
(Human) range
Linearity
Hysteresis
Cross-talk
Natural frequency
Temperature range
Calibration
Factory C
Weigh yourself, body mass, dead weight test. Vertical jump
Fx, Fy trickier
Pulley top and across plate to calibrate and double check the plate
BOD POD (Gold Standard)
Loading rate
Amount to take for initial load in the human body
Reduce load rate to reduce injuries, less stress
The shock imposed on the human system
Other uses
Internal Joint loading: Visual 3D
Gait analysis: LOCOMOTION
ANALYSIS
Towards us +
Towards screen -
Direction of Force important
Negative: breaking force
Propulsion
Straight line = plateau, not changing
GRAPH
Nipple (Little peak)
Breaking phase is small compared to propulsion, propulsion then finish
Fz: M shape with small impact phase, nice curve. Little impact
Compare values of 2 with shoes
Shoes absorb impact
Small bits
Shoes
BAREFOOT VS SHOES
Correct distance
Makes walking more natural
On foot on Force plate
13 meters (WALKING)
Run off, at least 16 meters
Move a feet or less for starting position and don't TARGET force plate
Use same foot, correct
Fx (Red line)
Have a practice run, familiarisation
Central of pressure
We can have one center point (different)
Fz trace is consistent in trained runners
Loading rate, point highest value, Timings of Fx and Fy. Training increases Propulsion phase
Movement from force
Fnet