Abstract

MAUREIRA P., H.  and  JARUR M., M. C.. Interpretation of the variability of the steady bipedal posture in age sensitive to the system control. Rev. mex. ing. bioméd [online]. 2016, vol.37, n.2, pp.123-134. ISSN 2395-9126.  https://doi.org/10.17488/rmib.37.2.4.

The human postural control study through statistical mechanic techniques identifies dynamic behavior with characteristics of persistence and anti-persistence. Such behaviors are interpreted like time-dependent variability of the control systems, and indicators that reflect these ones, are diffusion coefficient and scaling exponent obtained with stabilogram diffusion analysis (SDA) technique.

A force platform was used to obtain stabilometry records and SDA was applied in order to discriminate the temporal behavior of the variability in quasi-static bipedal position in a group of 22 students in critical age (11,2 ± 1,5 years old) for postural control maturity, between eyes-closed and eyes-open conditions.

The results of diffusion coefficients (Ds, DƖ ) and scaling exponents (Hs, HƖ ) in both visual condition have two distinct phases from ADE graphic and establish statistically significant differences for D s and H s, when comparing the displacement of COP between open eyes and closed eyes.

The SDA allows us to identify a behavior of postural control system similar to adults, modeled like a two-phase fractional Brownian motion.

Keywords : balance; center of pressure; stabilometry; variability; postural control; quiet standing.