Study of the human postural control system during quiet standing using detrended fluctuation analysis

2009 ◽  
Vol 388 (9) ◽  
pp. 1857-1866 ◽  
Author(s):  
M. Teresa Blázquez ◽  
Marta Anguiano ◽  
Fernando Arias de Saavedra ◽  
Antonio M. Lallena ◽  
Pedro Carpena
Keyword(s):  
Control System ◽  
Postural Control ◽  
Detrended Fluctuation Analysis ◽  
Quiet Standing ◽  
Fluctuation Analysis ◽  
Postural Control System ◽  
Detrended Fluctuation

scholarly journals Characterizing the human postural control system using detrended fluctuation analysis

2010 ◽  
Vol 233 (6) ◽  
pp. 1478-1482 ◽  
Author(s):  
M. Teresa Blázquez ◽  
Marta Anguiano ◽  
Fernando Arias de Saavedra ◽  
Antonio M. Lallena ◽  
Pedro Carpena
Keyword(s):  
Control System ◽  
Postural Control ◽  
Detrended Fluctuation Analysis ◽  
Fluctuation Analysis ◽  
Postural Control System ◽  
Detrended Fluctuation

Prolonged Standing Task Affects Adaptability of Postural Control in People With Parkinson’s Disease

2020 ◽  
Vol 35 (1) ◽  
pp. 58-67
Author(s):  
Gabriel Felipe Moretto ◽  
Felipe Balistieri Santinelli ◽  
Tiago Penedo ◽  
Luis Mochizuki ◽  
Natalia Madalena Rinaldi ◽  
...  
Keyword(s):  
Parkinson’S Disease ◽  
Parkinson's Disease ◽  
Control System ◽  
Postural Control ◽  
The Body ◽  
Quiet Standing ◽  
Body Sway ◽  
Control Group ◽  
Postural Control System ◽  
Prolonged Standing

Background Studies on short-term upright quiet standing tasks have presented contradictory findings about postural control in people with Parkinson’s disease (pwPD). Prolonged trial durations might better depict body sway and discriminate pwPD and controls. Objective The aim of this study was to investigate postural control in pwPD during a prolonged standing task. Methods A total of 26 pwPD and 25 neurologically healthy individuals performed 3 quiet standing trials (60 s) before completing a constrained prolonged standing task for 15 minutes. Motion capture was used to record body sway (Vicon, 100 Hz). To investigate the body sway behavior during the 15 minutes of standing, the analysis was divided into three 5-minute-long phases: early, middle, and late. The following body sway parameters were calculated for the anterior-posterior (AP) and medial-lateral (ML) directions: velocity, root-mean-square, and detrended fluctuations analysis (DFA). The body sway area was also calculated. Two-way ANOVAs (group and phases) and 1-way ANOVA (group) were used to compare these parameters for the prolonged standing and quiet standing, respectively. Results pwPD presented smaller sway area ( P < .001), less complexity (DFA; AP: P < .009; ML: P < .01), and faster velocity (AP: P < .002; ML: P < .001) of body sway compared with the control group during the prolonged standing task. Although the groups swayed similarly (no difference for sway area) during quiet standing, they presented differences in sway area during the prolonged standing task ( P < .001). Conclusions Prolonged standing task reduced adaptability of the postural control system in pwPD. In addition, the prolonged standing task may better analyze the adaptability of the postural control system in pwPD.

Identification and Stability Analysis of the Postural Control System During Small Magnitude Perturbations

2008 ◽  
Author(s):  
Bradley S. Davidson ◽  
Michael L. Madigan ◽  
Steve C. Southward ◽  
Maury A. Nussbaum
Keyword(s):  
Control System ◽  
Stability Analysis ◽  
Postural Control ◽  
Postural Sway ◽  
Sensory Information ◽  
Quiet Standing ◽  
Muscle Forces ◽  
Postural Control System ◽  
Small Magnitude ◽  
Age Related

Age-related increases in postural sway during quiet standing are well-documented [1]. These increases could result from age-related degradation of sensory information from the somatosensory [2] and vestibular [3] systems, or may result from inaccurate or imprecise muscle forces resulting from excitation-contraction uncoupling [4].

scholarly journals DYNAMIC PATTERNS OF POSTURAL FLUCTUATIONS DURING QUIET STANDING: A RECURRENCE QUANTIFICATION APPROACH

2011 ◽  
Vol 21 (04) ◽  
pp. 1163-1172 ◽  
Author(s):  
HAMED GHOMASHCHI ◽  
ALI ESTEKI ◽  
ALI MOTIE NASRABADI ◽  
JULIEN CLINTON SPROTT ◽  
FARID BAHRPEYMA
Keyword(s):  
Time Series ◽  
Control System ◽  
Postural Control ◽  
Postural Sway ◽  
Integrated Control ◽  
Quiet Standing ◽  
Group Differences ◽  
Postural Control System ◽  
Recurrence Quantification ◽  
Quantification Analysis

When standing quietly, the human body is continuously moving about an upright posture in an erratic fashion. Conventional posturographic analyses that ignore structure of postural steadiness time series do not fully characterize properties of sway dynamics. Recurrence quantification analysis is a technique that can extract the dynamics of postural fluctuations through several variables. In this study, standing-still-sway dynamics of intact and deteriorated postural control systems were investigated by recurrence quantification of stabilograms. The results indicated that both normal and changed postural fluctuations time series, despite erratic and irregular appearance, contain a hidden structure. Although the two components of postural sway originated from an integrated control system, they exhibit distinct dynamical patterns. More determinism, greater local stability, higher degrees of nonstationarity and more laminar states were observed in fore-aft movements. Our findings reveal that decay of postural control mechanism affects dynamical properties of postural control system (especially along mediolateral direction because of the type of impairment). Determinism, nonstationarity and rigidity of balance program as well as laminar states characteristics were increased due to deterioration of postural control system. These findings imply that these measures not only can be used as the pathologic measures to discriminate between group differences, but also provide new openings to understand the nature of postural sway.

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