TY - JOUR
T1 - Postural stability margins as a function of support surface slopes
AU - Dutt-Mazumder, Aviroop
AU - Slobounov, Seymon M.
AU - Challis, John Henry
AU - Newell, Karl Maxim
N1 - Publisher Copyright:
© 2016 Dutt-Mazumder et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
PY - 2016/10
Y1 - 2016/10
N2 - This investigation examined the effects of slope of the surface of support (35°, 30°, 20°, 10° Facing(Toe) Down, 0° Flat and 10°, 20°, 25° 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° 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 spatiooral 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.
AB - This investigation examined the effects of slope of the surface of support (35°, 30°, 20°, 10° Facing(Toe) Down, 0° Flat and 10°, 20°, 25° 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° 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 spatiooral 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.
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U2 - 10.1371/journal.pone.0164913
DO - 10.1371/journal.pone.0164913
M3 - Article
C2 - 27764158
AN - SCOPUS:84992179941
SN - 1932-6203
VL - 11
JO - PloS one
JF - PloS one
IS - 10
M1 - e0164913
ER -