Article

Postural stabilization is required following perturbations or after transitioning
to standing. The current research evaluated two available algorithms that utilize
within-trial data to quantify standing following multi-planar transitions.
Forty-five participants began each trial by assuming a static forward kneeling
posture that ended with an auditory signal prompting transition to standing. Data
from two force plates was collected at 100Hz for 20s starting with the
transition. With one algorithm, using windows of various lengths, stabilization
time was defined as when mean center of pressure (CoP) velocity of the current
window was less than that for the mean of all subsequent windows. This algorithm
produced significantly different stabilization times (1.3-6.9s) depending on the
window length. In a second algorithm, a negative exponential mathematical model
was fit to data within each trial (R(2)=0.93). This approach was easily
implemented and produced results (mean=2.1s) with lower variability (SD=0.9s).
Though approaches exist that adequately determine stabilization times in
well-constrained uni-planar movements, there are limitations to generalizability.
The negative exponential mathematical model evaluated in this study provides a
promising method for systematically determining stabilization times for
multi-planar movements.
CI - Copyright (c) 2013 Elsevier B.V. All rights reserved.

Langue : ANGLAIS