Quantifying postural stability of patients with cerebellar disorder during quiet stance using three-axis accelerometer

2018 ◽  
Vol 40 ◽  
pp. 378-384 ◽  
Author(s):  
Barbora Adamová ◽  
Patrik Kutilek ◽  
Ondrej Cakrt ◽  
Zdenek Svoboda ◽  
Slavka Viteckova ◽  
...  
Keyword(s):  
Postural Stability ◽  
Quiet Stance ◽  
Cerebellar Disorder

VOLUME OF CONVEX HULL: A TECHNIQUE FOR QUANTIFYING HUMAN POSTURAL STABILITY

2016 ◽  
Vol 16 (02) ◽  
pp. 1650013 ◽  
Author(s):  
PATRIK KUTILEK ◽  
ONDREJ CAKRT ◽  
VLADIMIR SOCHA ◽  
KAREL HANA
Keyword(s):  
Convex Hull ◽  
Postural Stability ◽  
Postural Sway ◽  
Balance Control ◽  
The Body ◽  
Quiet Stance ◽  
Body Segments ◽  
3D Space ◽  
Cerebellar Disorder ◽  
Trunk Sway

Many disorders, such as nervous system disorders, can affect orientation of the body segments in 3D space negatively. Patients with these disorders often show body segments instability during stance tasks. Nowadays, 3-axis gyroscopes are about to be used to measure postural stability. The main objective of the paper is to describe a method which would be suitable for quantifying postural stability and 3D movement as a whole using a cheap 3-axis gyroscope. New method based on the volume of a 3D convex hull (CH) obtained by plotting pitch, roll and yaw angles versus each other was proposed for quantitative evaluation of 3D trunk sway. The sway was measured while patients with degenerative cerebellar disorder (Pts) and eleven healthy subjects (HSs) performed quiet stance on a firm surface (FiS) and foam surface (FoS) with open eyes (OE) and closed eyes (CE). The CH was used to identify differences in balance control, and there were significant differences found between the two groups. The median (Mdn) of the volume of Pts with OE on FiS is four times larger than the Mdn of the volume of HS with OE on FiS. The Mdn of the volume of Pts with CE on FoS is 80 times larger than the Mdn of the volume of HS with CE on FoS. It was therefore found that the volume of CH is suitable for quantifying postural sway and identifying differences in balance control.

Experimental Muscle Pain Challenges the Postural Stability During Quiet Stance and Unexpected Posture Perturbation

2011 ◽  
Vol 12 (8) ◽  
pp. 911-919 ◽  
Author(s):  
Rogério Pessoto Hirata ◽  
Ulysses Fernandes Ervilha ◽  
Lars Arendt-Nielsen ◽  
Thomas Graven-Nielsen
Keyword(s):  
Muscle Pain ◽  
Postural Stability ◽  
Quiet Stance ◽  
Experimental Muscle Pain

Examining Quiet Standing Center of Pressure Data Using Invariant Density Analysis

2009 ◽  
Author(s):  
Pilwon Hur ◽  
K. Alex Shorter ◽  
Elizabeth T. Hsiao-Wecksler
Keyword(s):  
Postural Stability ◽  
Center Of Pressure ◽  
Quiet Standing ◽  
Physiological System ◽  
Quiet Stance ◽  
Invariant Density ◽  
Pressure Data ◽  
Density Analysis ◽  
Insight Into

Posturographic data collected during quiet stance using force plates is widely used to assess postural stability [1]. Center of pressure (COP) is a commonly used experimental variable for several types of analyses. Traditionally, COP data have been analyzed using measures that describe the shape or speed of the trajectory [1]. Unfortunately, these parameters do not provide insight into the physiological system as a whole and have been shown to have questionable reliability [2].

Experimental calf muscle pain attenuates the postural stability during quiet stance and perturbation

2010 ◽  
Vol 25 (9) ◽  
pp. 931-937 ◽  
Author(s):  
Rogério Pessoto Hirata ◽  
Lars Arendt-Nielsen ◽  
Thomas Graven-Nielsen
Keyword(s):  
Muscle Pain ◽  
Postural Stability ◽  
Calf Muscle ◽  
Quiet Stance

Evaluation of Time-to-Contact Measures for Assessing Postural Stability

2006 ◽  
Vol 22 (2) ◽  
pp. 155-161 ◽  
Author(s):  
Jeffrey M. Haddad ◽  
Jeff L. Gagnon ◽  
Christopher J. Hasson ◽  
Richard E.A. Van Emmerik ◽  
Joseph Hamill
Keyword(s):  
Control System ◽  
Postural Stability ◽  
Center Of Pressure ◽  
Center Of Mass ◽  
Stability Boundary ◽  
Quiet Stance ◽  
Postural Control System ◽  
Time To Contact ◽  
Additional Information ◽  
Spatial Measures

Postural stability has traditionally been examined through spatial measures of the center of mass (CoM) or center of pressure (CoP), where larger amounts of CoM or CoP movements are considered signs of postural instability. However, for stabilization, the postural control system may utilize additional information about the CoM or CoP such as velocity, acceleration, and the temporal margin to a stability boundary. Postural time-to-contact (TtC) is a variable that can take into account this additional information about the CoM or CoP. Postural TtC is the time it would take the CoM or CoP, given its instantaneous trajectory, to contact a stability boundary. This is essentially the time the system has to reverse any perturbation before stance is threatened. Although this measure shows promise in assessing postural stability, the TtC values derived between studies are highly ambiguous due to major differences in how they are calculated. In this study, various methodologies used to assess postural TtC were compared during quiet stance and induced-sway conditions. The effects of the different methodologies on TtC values will be assessed, and issues regarding the interpretation of TtC data will also be discussed.

Postural stability in the dog

1965 ◽  
Vol 208 (6) ◽  
pp. 1047-1057 ◽  
Author(s):  
J. M. Brookhart ◽  
P. L. Parmeggiani ◽  
W. A. Petersen ◽  
S. A. Stone
Keyword(s):  
Control System ◽  
Postural Control ◽  
Weight Distribution ◽  
Postural Stability ◽  
Center Of Gravity ◽  
Total Weight ◽  
Quiet Stance ◽  
Nervous Regulation ◽  
Postural Control System ◽  
The Mean

Positional stability in quietly standing dogs has been evaluated in terms of force records from individual feet and the position of the center of gravity. All four dogs carried approximately 60% of their total weight on their anterior feet and roughly 50% of their weight on each side. Within-trial variations from the mean of the fraction of total weight borne on any one foot ranged from 0.3 to 4.5% with a mean of 1.4%; between-trial variability ranged from 1.1 to 2.7%. Continuous movement of the center of gravity occurred within an area measuring approximately 1.5 cm on a side. Shifts in weight distribution within and between trials occurred in a variety of patterns which could be described in terms of the behavior of pairs of transverse, longitudinal, and diagonal couples. Preliminary observations of the reactions to a sudden disturbance confirm the hypothesis that quiet stance is accomplished through central nervous regulation. It is concluded that the trained dog behaves with a sufficient level of predictability to permit its use as a subject in a further examination of the postural control system.

Postural stability of canoeing and kayaking young male athletes during quiet stance

2011 ◽  
Vol 112 (5) ◽  
pp. 1807-1815 ◽  
Author(s):  
Katerina Stambolieva ◽  
Vassilis Diafas ◽  
Vichren Bachev ◽  
Lilia Christova ◽  
Plamen Gatev
Keyword(s):  
Postural Stability ◽  
Young Male ◽  
Quiet Stance ◽  
Male Athletes

scholarly journals How does mixed reality affect quiet stance?

2017 ◽  
Author(s):  
Gaiqing Kong ◽  
Kunlin Wei ◽  
Konrad P. Kording
Keyword(s):  
Everyday Life ◽  
Postural Stability ◽  
Moving Objects ◽  
Mixed Reality ◽  
Learning Design ◽  
Quiet Stance ◽  
Solid Object ◽  
Virtual Objects ◽  
Dynamic Setting ◽  
Microsoft Hololens

AbstractMixed reality (MR) has promise for learning, design, and entertainment, and for use during everyday life. However, when interacting with objects in mixed reality, will moving objects make us fall or perturb our postural stability? To address this question, we recruited participants, instructed them to stand quietly, and measured how much virtual objects presented in mixed reality (Microsoft HoloLens) affected their stance. We analyzed the effects of solid object and text, in both a static and a dynamic setting. Mixed reality events induced some movements, but the effect, while significant, was exceptionally small (< 1mm & < 0.5° perturbations in terms of mean distance and angle rotations). We conclude that induced movement in “real reality” should not be too much of a concern when designing mixed reality applications.

scholarly journals Postural Sway and Effect of Levodopa in Early Parkinson's Disease

2008 ◽  
Vol 35 (1) ◽  
pp. 65-68 ◽  
Author(s):  
Anne Beuter ◽  
Roberto Hernández ◽  
Robert Rigal ◽  
Julien Modolo ◽  
Pierre J. Blanchet
Keyword(s):  
Parkinson’S Disease ◽  
Parkinson's Disease ◽  
Postural Stability ◽  
Postural Sway ◽  
Stability Control ◽  
Control Mechanisms ◽  
Quiet Stance ◽  
Dependent Variables ◽  
Eyes Open ◽  
Early Parkinson’S Disease

Objective:To characterize postural stability control and levodopa responsiveness in early Parkinson's disease (PD).Methods:Postural sway was studied during quiet stance in ten patients within six years of PD onset, both before (OFF) and after (ON) regular oral levodopa dosing. Postural sway was recorded using a force platform during 30 sec with eyes open, and six dependent variables were examined.Results:Mild baseline subclinical changes in postural sway were recorded in our patients. Clear benefit was observed in five out of six characteristics (mean sway, transversal sway, sagittal sway, sway intensity, and sway area) in the ON condition.Conclusion:Postural control mechanisms are affected early in PD and modulated by dopamine.

Influence of virtual reality on postural stability during movements of quiet stance

2009 ◽  
Vol 451 (3) ◽  
pp. 227-231 ◽  
Author(s):  
Corinne G.C. Horlings ◽  
Mark G. Carpenter ◽  
Ursula M. Küng ◽  
Flurin Honegger ◽  
Brenda Wiederhold ◽  
...  
Keyword(s):  
Virtual Reality ◽  
Postural Stability ◽  
Quiet Stance
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