Lecture notes Advanced Biomechanical Analysis

Biomechanics – Smoothing – 30/01/23
 Signal Content –
o True Value – The real value at each time
o Error (“Noise”)




True Signal




Error




Recorded
Signal




 IKD errors –
o Misalignment of the axis
o Other muscles being involved
o Is it 100% effort
o Allow speed to be within 10%
 Systematic Error –
o Electronic Drift
o Calibration Errors
o Consistent Mistakes
 Random –
o Equally likely in any direction
 Propagation of Errors –
o Errors can increase each time they are used in calculations
 Validity –
o How well you are measuring what you are supposed to be measuring
o Is the average where it should be
 Reliability –
o The consistency of measurements under different “conditions”
 Repeatability –
o Test-retest reliability