Postural Stability Margins as a Function of Support Surface Slopes

作者：Dutt Mazumder Aviroop^*; Slobounov Seymon M; Challis John Henry; Newell Karl Maxim

来源：PLos One, 2016, 11(10): e0164913.

DOI：10.1371/journal.pone.0164913

This investigation examined the effects of slope of the surface of support (35 degrees, 30 degrees, 20 degrees, 10 degrees Facing(Toe) Down, 0 degrees Flat and 10 degrees, 20 degrees, 25 degrees Facing (Toe) Up) and postural orientation on the margins of postural stability in quiet standing of young adults. The findings showed that the center of pressure-CoP (displacement, area and length) had least motion at the baseline (0 degrees Flat) platform condition that progressively increased as a function of platform angle in both facing up and down directions. The virtual time to collision (VTC) dynamics revealed that the spatio-temporal margins to the functional stability boundary were progressively smaller and the VTC time series also more regular (SampEn-Sample Entropy) as slope angle increased. Surface slope induces a restricted stability region with lower dimension VTC dynamics that is more constrained when postural orientation is facing down the slope. These findings provide further evidence that VTC acts as a control variable in standing posture that is influenced by the emergent dynamics of the individual-environment-task interaction.

• 出版日期2016-10-20