Frequencies in center of pressure time series above 1Hz during quiet upright stance reflect the use of a hip strategy

2008 ◽  
Author(s):  
Hongbo Zhang ◽  
Maury A. Nussbaum
Keyword(s):  
Time Series ◽  
Center Of Pressure ◽  
Upright Stance ◽  
Hip Strategy ◽  
Pressure Time

Assessment of differenced center of pressure time series improves detection of age-related changes in postural coordination

2013 ◽  
Vol 38 (2) ◽  
pp. 345-348 ◽  
Author(s):  
Adam J. Strang ◽  
Angela DiDomenico ◽  
William P. Berg ◽  
Raymond W. McGorry
Keyword(s):  
Time Series ◽  
Center Of Pressure ◽  
Postural Coordination ◽  
Age Related ◽  
Pressure Time ◽  
Age Related Changes

Complexity and variability of the center of pressure time series during quiet standing in patients with knee osteoarthritis

2016 ◽  
Vol 32 ◽  
pp. 280-285 ◽  
Author(s):  
Hossein Negahban ◽  
Mohammad Ali Sanjari ◽  
Mehrnoosh Karimi ◽  
Mohamad Parnianpour
Keyword(s):  
Time Series ◽  
Knee Osteoarthritis ◽  
Center Of Pressure ◽  
Quiet Standing ◽  
Pressure Time

DYNAMICS UNDERLYING PATIENT-VENTILATOR INTERACTIONS DURING NOCTURNAL NONINVASIVE VENTILATION

2012 ◽  
Vol 22 (02) ◽  
pp. 1250030 ◽  
Author(s):  
R. NAECK ◽  
D. BOUNOIARE ◽  
U. S. FREITAS ◽  
H. RABARIMANANTSOA ◽  
A. PORTMANN ◽  
...  
Keyword(s):  
Time Series ◽  
Respiratory Failure ◽  
Shannon Entropy ◽  
Noninvasive Ventilation ◽  
Spontaneous Breathing ◽  
Sleep Stages ◽  
Common Procedure ◽  
Pressure Time ◽  
Ventilatory Assistance

Noninvasive ventilation is a common procedure for managing patients having chronic respiratory failure. The success of this ventilatory assistance is often linked with patient's tolerance that is known to be related to the quality of the synchronization between patient's spontaneous breathing cycles and ventilatory cycles delivered by the ventilator. Thirty-four sleep sessions (more than 5000 ventilatory cycles each) were automatically investigated using a specific algorithm processing airflow and pressure time series. Four groups of patients were defined according to the interplay between asynchrony events and leaks. Different mechanisms that depend on sleep stages were thus evidenced. A Shannon entropy was also proposed as a new sleep fragmentation quantification methodology.

scholarly journals Effects of additional load at different heights on gait initiation: A statistical parametric mapping of center of pressure and center of mass behavior

PLoS ONE ◽  
2021 ◽  
Vol 16 (6) ◽  
pp. e0242892
Author(s):  
Marcus Fraga Vieira ◽  
Fábio Barbosa Rodrigues ◽  
Alfredo de Oliveira Assis ◽  
Eduardo de Mendonça Mesquita ◽  
Thiago Santana Lemes ◽  
...  
Keyword(s):  
Time Series ◽  
Center Of Pressure ◽  
Center Of Mass ◽  
Statistical Parametric Mapping ◽  
Gait Initiation ◽  
Experimental Conditions ◽  
Distributed Load ◽  
Uniformly Distributed Load ◽  
Reaction Forces ◽  
Controlled Object

The purpose of this study was to investigate the effects of different vertical positions of an asymmetrical load on the anticipatory postural adjustments phase of gait initiation. Sixty-eight college students (32 males, 36 females; age: 23.65 ± 3.21 years old; weight: 69.98 ± 8.15 kg; height: 1.74 ± 0.08 m) were enrolled in the study. Ground reaction forces and moments were collected using two force platforms. The participants completed three trials under each of the following random conditions: no-load (NL), waist uniformly distributed load (WUD), shoulder uniformly distributed load (SUD), waist stance foot load (WST), shoulder stance foot load (SST), waist swing foot load (WSW), and shoulder swing foot load (SSW). The paired Hotelling’s T-square test was used to compare the experimental conditions. The center of pressure (COP) time series were significantly different for the SUD vs. NL, SST vs. NL, WST vs. NL, and WSW vs. NL comparisons. Significant differences in COP time series were observed for all comparisons between waist vs. shoulder conditions. Overall, these differences were greater when the load was positioned at the shoulders. For the center of mass (COM) time series, significant differences were found for the WUD vs. NL and WSW vs. NL conditions. However, no differences were observed with the load positioned at the shoulders. In conclusion, only asymmetrical loading at the waist produced significant differences, and the higher the extra load, the greater the effects on COP behavior. By contrast, only minor changes were observed in COM behavior, suggesting that the changes in COP (the controller) behavior are adjustments to maintain the COM (controlled object) unaltered.

scholarly journals Processing moving visual scenes during upright stance in elderly patients with mild cognitive impairment

PeerJ ◽  
2020 ◽  
Vol 8 ◽  
pp. e10363
Author(s):  
Martin Kucharik ◽  
Zuzana Kosutzka ◽  
Jozef Pucik ◽  
Michal Hajduk ◽  
Marian Saling
Keyword(s):  
Cognitive Impairment ◽  
Mild Cognitive Impairment ◽  
Visual Stimulation ◽  
Center Of Pressure ◽  
Visual Scene ◽  
Upright Stance ◽  
Stimulus Period ◽  
Postural Responses ◽  
The Subject ◽  
Visual Scenes

Background The ability to maintain balance in an upright stance gradually worsens with age and is even more difficult for patients with cognitive disorders. Cognitive impairment plays a probable role in the worsening of stability. The purpose of this study was to expose subjects with mild cognitive impairment (MCI) and healthy, age-matched controls to moving visual scenes in order to examine their postural adaptation abilities. Methods We observed postural responses to moving visual stimulation while subjects stood on a force platform. The visual disturbance was created by interposing a moving picture in four directions (forward, backward, right, and left). The pre-stimulus (a static scene for 10 s), stimulus (a dynamic visual scene for 20 seconds) and post-stimulus (a static scene for 20 seconds) periods were evaluated. We separately analyzed the total path (TP) of the center of pressure (COP) and the root mean square (RMS) of the COP displacement in all four directions. Results We found differences in the TP of the COP during the post-stimulus period for all stimulus directions except in motion towards the subject (left p = 0.006, right p = 0.004, and away from the subject p = 0.009). Significant RMS differences between groups were also observed during the post-stimulus period in all directions except when directed towards the subject (left p = 0.002, right p = 0.007, and away from the subject p = 0.014). Conclusion Exposing subjects to a moving visual scene induced greater destabilization in MCI subjects compared to healthy elderly controls. Surprisingly, the moving visual scene also induced significant aftereffects in the MCI group. Our findings indicate that the MCI group had diminished adaptation to the dynamic visual scene and recovery. These results suggest that even mild cognitive deficits can impair sensory information integration and alter the sensory re-weighing process.

scholarly journals Center of Pressure based Assessment of Balance Responses to Repeated Perturbations of Upright Stance

2017 ◽  
pp. 262-265 ◽  
Author(s):  
Alessandro Mengarelli ◽  
Stefano Cardarelli ◽  
Sandro Fioretti ◽  
Laura Burattini ◽  
Francesco Di Nardo ◽  
...  
Keyword(s):  
Center Of Pressure ◽  
Upright Stance
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