PMID: 6981506Jan 1, 1982Paper

The spectral characteristics of postural sway behaviour

European Journal of Applied Physiology and Occupational Physiology
R W Soames, J Atha

Abstract

To determine whether recognisable profiles of sway behaviour are characteristically found among normal subjects the energy content of a contiguous series of bandwidths were computed from power density spectra of the sway behaviour of 29 young men and 29 young women. No significant differences were observed over time either in the energy content or in the profile shape of the power spectral density (PSD) records when these were subjected to a multivariate profile analysis of variance. It was observed that the majority of energy in the power spectrum, viz. 90% (+/- 4%) in the antero-posterior and 95% (+/- 3%) in the lateral direction, was below 2.0 Hz. Three dominant frequencies of sway were identifiable in 93% of subjects. The modal frequencies in the antero-posterior direction were 0.30-0.45 Hz (primary), 0.60-0.75 Hz (secondary) and 1.05-1.20 Hz (tertiary), and in the lateral direction 0.30-0.45 Hz (primary), 0.45-0.60 Hz (secondary) and 0.75-0.90 Hz (tertiary). These three dominant frequencies were distributed over the full frequency range. An explanation of their origins was not sought but the suggestion is made that they could be driven by common dynamic physiological events. The patterns of energy distribution were simplif...Continue Reading

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