Dynamical and stabilometric measures are complementary for the characterization of postural fluctuations in older women

We investigate the complementarities of several measures extracted from center of pressure (COP) recordings during quiet standing, in older women. The selected variables include classical stabilometric measures (SMs) and several dynamical measures (DMs). The computed DMs quantify various features of the temporal structure of COP signals, including predictability, regularity and smoothness of the trajectories. The postural fluctuations of a group of 101 healthy older women were recorded by means of a force platform. After estimating the SMs and DMs from the COP data, we used principal components analysis (PCA) to quantify the contribution of each measure. The results suggest that SMs and DMs are complementary. In addition, the different DMs are globally not redundant. This finding is a reinforcement argument in favor of the use of DMs as postural signatures.

► Dynamical and traditional postural measures are complementary in older women. ► Dynamical measures describing different features of postural fluctuations temporal structure are not redundant. ► Predictability, regularity and smoothness measures provide useful information on postural sway in older women.