Computerized posturography for data analysis and mathematical
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Дата
2007
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Анотація
Mechanisms of balance control are investigated on computerized posturography data on vertical two-legged and
uncomfortable one-legged stance measured on healthy subjects. Oscillations of the centre of mass in the course of 30 s
standing and the corresponding trajectories for a step forward off the force platform have been computed. Spectral analysis
of the time series revealed three main harmonics for the studied postures. When a volunteer was balancing standing on one
leg, all the harmonics were shifted towards the high frequencies and the sway amplitude was twice increased in
comparison with comfortable two-legged vertical stance. Decomposition of the sway trajectories into the rambling and
trembling components has been carried out. It was shown that in the course of the one-legged stance the balance control
strategy includes ‘scanning’ of the larger area with bigger sway amplitudes in the vicinity of the stable state as compared
to two-legged stance. A mathematical model of the body as a multi-link system is considered. Mass and inertia of each
body segment and torques in joints are taken into consideration. The calculated own and forced frequencies of the model
correspond to the spectral analysis of the posturography data. One-legged stance is proposed as an excellent tool for
revealing the balance problems. It is shown that investigation of the oscillations and trajectories of the centre of mass for
the step forward off the force platform is perspective for medical diagnostics to distinguish between the spine and joint
pathologies.
Опис
Ключові слова
biomechanical modelling, sway analysis, computerized posturography, medical diagnostics, spectral analysis
Бібліографічний опис
J.Vibroeng. v.9,N3