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A time-frequency approach to estimate critical time intervals in postural control
Hongbo Zhang1, Maury A Nussbaum, Michael J Agnew
1a Department of Industrial and Systems Engineering , Virginia Tech , 250 Durham Hall (0118), Blacksburg , VA 24061 , USA.
Computer Methods in Biomechanics and Biomedical Engineering
|August 9, 2014
Summary
A new intermittent critical time interval (ICTI) method estimates upright stance control transitions. This approach uses time-frequency analysis to improve critical time interval (CTI) assessments.
Area of Science:
- Biomechanics
- Control Theory
- Human Postural Control
Background:
- The critical time interval (CTI) differentiates open-loop from closed-loop control in upright stance.
- Upright standing is increasingly understood as an intermittent, not asymptotic, stability process.
Purpose of the Study:
- To develop and introduce a novel method for determining CTIs.
- To enhance the estimation of the transition interval between open- and closed-loop postural control.
Main Methods:
- The intermittent critical time interval (ICTI) method was developed.
- Center-of-pressure time series data were analyzed using wavelet transform for time-frequency domain analysis.
- CTI was defined as the time between local maxima within a 0.5-1.1 Hz frequency band.
Main Results:
- The ICTI method provides a new approach to quantifying postural control dynamics.
- The time-frequency analysis successfully identified key intervals within the center-of-pressure data.
Conclusions:
- The ICTI method offers improved estimates for the transition time interval in upright stance.
- This method has potential applications in simulating postural control and assessing temporal changes in CTIs.
