Biomechanical Applications Flashcards
Motion analysis
Separation of movement into its constituent parts for immediate or delayed analysis
Two things to consider for type of camera used for analysis
- Resolution
- Capture rate
If a video camera records at 15 Hz, what is the time stamp?
1 / 15 = 0.0667s
Three steps of motion analysis
- Timing
- Digitisation
- Scaling factor
How to calculate movement time
Multiply frame number by time stamp
How to digitise
Draw an X-Y co ordinate system
How to work out scaling factor
Divide real world distance by measured distance
How to work out real world distance
Multiply measured distance by scaling factor
Average velocity
Velocity measured over a finite time interval e.g. a whole race
Instantaneous velocity
Velocity measured over a relatively short period of time e.g. one lap of a race
Electromyography
Using specialised sensors to measure the muscle activity during movement
As velocity of contraction increases, force ____
Decreases
Long-distance runners have ____ toes
Shorter
Resolution
Amount of detail included in the picture
