The sensitivity of posturographic parameters to acquisition settings.
The objective of this study was to evaluate the sensitivity of posturographic parameters (PP) to changes in acquisition settings. A group of eight young adults underwent a set of typical orthostatic posture trials, and selected PP were then calculated from a set of centre of pressure (CoP) displacement time series obtained by applying different cut-off frequencies to the same set of raw data. Four PP out of 11 showed significant changes with respect to cut-off frequency. Statistical mechanics parameters exhibited smaller sensitivity than summary measures. On the basis of the results obtained, a proposal for a standard cut-off frequency and a sampling rate value is embodied in the paper together with some suggestions on measurement settings, with a view to standardized use of instrumentation for quantitative analysis in orthostatic posturography.
Schmid
M
M
Dipartimento di Ingegneria Meccanica e Industriale, Università di Roma Tre, Via della Vasca Navale 79, I-00146, Rome, Italy.
Conforto
S
S
Camomilla
V
V
Cappozzo
A
A
D'Alessio
T
T
D000054:Acceleration; D000328:Adult; D000703:Analog-Digital Conversion; D002138:Calibration; D005260:Female; D005583:Fourier Analysis; D006801:Humans; D008297:Male; D009068:Movement / Q000502:physiology*; D010808:Physical Examination / Q000295:instrumentation / Q000379:methods* / Q000592:standards; D004856:Postural Balance / Q000502:physiology*; D011187:Posture / Q000502:physiology*; D011312:Pressure; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012815:Signal Processing, Computer-Assisted; D013314:Stress, Mechanical