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Journal ArticleDOI

Stabilometric parameters are affected by anthropometry and foot placement.

01 Nov 2002-Clinical Biomechanics (Elsevier)-Vol. 17, Iss: 9, pp 666-677
TL;DR: Care should be taken when quantifying postural sway through stabilometric parameters, and it is suggested as a good practice to include some anthropometric measurements in the experimental protocol, and to standardize or trace foot position.
About: This article is published in Clinical Biomechanics.The article was published on 2002-11-01. It has received 494 citations till now.
Citations
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Journal ArticleDOI
TL;DR: A non-monotonic, U-shaped relation between the efficacy of postural control and concurrent cognitive demands that reflect opposing trends of the effects of attention focus and attentional resource competition is proposed and empirically examined.

530 citations

Journal ArticleDOI
TL;DR: The studies reviewed show that bipedal static COP measures may be used as a reliable tool for investigating general postural stability and balance performance under specific conditions and recommendations for maximizing the reliability of COP data are provided.

500 citations


Cites background or methods from "Stabilometric parameters are affect..."

  • ...While the evaluation of COP excursions is a commonly used method for measuring postural stability [21–38] no standardization of thismethod exists....

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  • ...While most articles provided basic details on the baseline demographics, only few articles addressed the effect of intrinsic physical differences between subjects such as body mass index (BMI), height or weight on the reliability of COP measures [23,24]....

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  • ...It has been shown that widening of the foot position increases the passive stability of the musculoskeletal system and decreases active neural control [23,48]....

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  • ...This should be included in all COP studies as it has been demonstrated that selected temporal-distance COP parameters such as mean velocity or range are strongly dependent on the subject’s height [23] and weight [25]....

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  • ...[23] and Pinsault and Vuillerme [27]....

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Journal ArticleDOI
TL;DR: Revelar os metodos de analise experimental de dados utilizados para investigacao do controle postural em seres humanos e demonstrar o calculo e rotinas de programacao das principais medidas utilizadas na avaliacao desse controle.
Abstract: CONTEXTUALIZACAO: A manutencao do equilibrio e da orientacao corporal em humanos e garantida pelo adequado funcionamento do sistema de controle postural. A investigacao desse controle tem despertado interesse em profissionais de diversas areas, tais como, Fisioterapia, Educacao Fisica, Engenharia, Fisica, Medicina, Psicologia, entre outras. OBJETIVOS: Revisar os metodos de analise experimental de dados utilizados para investigacao do controle postural em seres humanos e demonstrar o calculo e rotinas de programacao das principais medidas utilizadas na avaliacao desse controle. CONCLUSAO: Os procedimentos experimentais e as medidas utilizadas na avaliacao do controle postural apresentados nesta revisao poderao auxiliar na padronizacao da investigacao do controle postural.

483 citations

Journal ArticleDOI
TL;DR: It is suggested that body weight may be an important risk factor for falling and the combined effect of aging and obesity on falling and injuries and the impact of obesity on the diverse range of activities of daily living.

446 citations


Cites background from "Stabilometric parameters are affect..."

  • ...In previous studies, age, body height and foot length also have been considered as predictors of postural stability [12,16,21,22]....

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  • ...[12] investigated more closely the relationship between body sway oscillations and various anthropometric parameters....

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  • ...For instance, body height and foot length also have been suggested to affect balance control [12,13]....

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01 Jan 2010
TL;DR: In this paper, the authors present a review of the methods of data analysis used to investigate the postural control in human beings and demonstrate the computational algorithms of the main measures used in the posturgrafia evaluation.
Abstract: Resumo Contextualizacao: A manutencao do equilibrio e da orientacao corporal em humanos e garantida pelo adequado funcionamento do sistema de controle postural. A investigacao desse controle tem despertado interesse em profissionais de diversas areas, tais como, Fisioterapia, Educacao Fisica, Engenharia, Fisica, Medicina, Psicologia, entre outras. Objetivos: Revisar os metodos de analise experimental de dados utilizados para investigacao do controle postural em seres humanos e demonstrar o calculo e rotinas de programacao das principais medidas utilizadas na avaliacao desse controle. Conclusao: Os procedimentos experimentais e as medidas utilizadas na avaliacao do controle postural apresentados nesta revisao poderao auxiliar na padronizacao da investigacao do controle postural. Palavras-chave: controle motor; biomecânica; plataforma de forca; posturografia; equilibrio; centro de pressao. Abstract Background: The maintenance of balance and body orientation in humans is guaranteed by the adequate functioning of the postural control system. The investigation of this control has awakened the interest of professionals from several fields such as Physical Therapy, Physical Education, Engineering, Physics, Medicine, Psychology, and others. Objectives: The purposes of this study are to revise the methods of data analysis used to investigate the postural control in human beings and to demonstrate the computational algorithms of the main measures used in the postural control evaluation. Conclusion: The experimental procedures and measures used in postural control evaluation presented in this review can help in the standardization of postural control investigation.

443 citations

References
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Book
01 May 1986
TL;DR: In this article, the authors present a graphical representation of data using Principal Component Analysis (PCA) for time series and other non-independent data, as well as a generalization and adaptation of principal component analysis.
Abstract: Introduction * Properties of Population Principal Components * Properties of Sample Principal Components * Interpreting Principal Components: Examples * Graphical Representation of Data Using Principal Components * Choosing a Subset of Principal Components or Variables * Principal Component Analysis and Factor Analysis * Principal Components in Regression Analysis * Principal Components Used with Other Multivariate Techniques * Outlier Detection, Influential Observations and Robust Estimation * Rotation and Interpretation of Principal Components * Principal Component Analysis for Time Series and Other Non-Independent Data * Principal Component Analysis for Special Types of Data * Generalizations and Adaptations of Principal Component Analysis

17,446 citations

Book
01 Jan 1987
TL;DR: This paper presents the results of a two-year study of the statistical treatment of outliers in the context of one-Dimensional Location and its applications to discrete-time reinforcement learning.
Abstract: 1. Introduction. 2. Simple Regression. 3. Multiple Regression. 4. The Special Case of One-Dimensional Location. 5. Algorithms. 6. Outlier Diagnostics. 7. Related Statistical Techniques. References. Table of Data Sets. Index.

6,955 citations


"Stabilometric parameters are affect..." refers methods in this paper

  • ...This was done by means of maximum-likelihood robust regression techniques [22] that provide an alternative to least squares regression....

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Journal ArticleDOI
TL;DR: The inverted pendulum model permitted us to understand the separate roles of the two mechanisms during these critical unbalancing and rebalancing periods and confirmed the critical importance of the hip abductors/adductors in balance during all phases of standing and walking.

2,940 citations


"Stabilometric parameters are affect..." refers background in this paper

  • ...These adjustments are characterized by lower frequencies since they involve the slow motion of the center of mass [2]....

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  • ...Ground-reaction vector and CoP provide important insights into the process of controlling balance since they can be directly related to the motion of body center of mass [2]....

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Journal ArticleDOI
TL;DR: Evaluating the relative sensitivity of center-of-pressure (COP)-based measures to changes in postural steadiness related to age found mean velocity of the COP was the only measure that identified age-related changes in both eye conditions, and differences between eye conditions in both age groups.
Abstract: Measures of postural steadiness are used to characterize the dynamics of the postural control system associated with maintaining balance during quiet standing. The objective of this study was to evaluate the relative sensitivity of center-of-pressure (COP)-based measures to changes in postural steadiness related to age. A variety of time and frequency domain measures of postural steadiness were compared between a group of twenty healthy young adults (21-35 years) and a group of twenty healthy elderly adults (66-70 years) under both eyes-open and eyes-closed conditions. The measures that identified differences between the eyes-open and eyes-closed conditions in the young adult group were different than those that identified differences between the eye conditions in the elderly adult group. Mean velocity of the COP was the only measure that identified age-related changes in both eye conditions, and differences between eye conditions in both age groups. The results of this study will be useful to researchers and clinicians using COP-based measures to evaluate postural steadiness.

1,538 citations


"Stabilometric parameters are affect..." refers background or methods in this paper

  • ...Seventeen parameters were computed from each of the two components of CoP displacement, and from the 2D (distance) time series (see [3])....

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  • ...Nonetheless, few authors have tried so far to select a subset of non-redundant and complementary features [3]....

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  • ...Section I––summary statistic scores [3,20]...

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  • ...The absence of correlation between the 2D composite parameters and the base of support measurements confirms that 2D measures should be preferred when the placement of the feet on the force plate is not constrained [3]....

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  • ...The full list of the summary statistic scores computed throughout this paper is reported in the first section of Table 2 [3,18]....

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Journal ArticleDOI
TL;DR: This work strongly supports the position that much can be learned about the functional organization of the postural control system by studying the steady-state behavior of the human body during periods of undisturbed stance.
Abstract: A new conceptual and theoretical framework for studying the human postural control system is introduced. Mathematical techniques from statistical mechanics are developed and applied to the analysis and interpretation of stabilograms. This work was based on the assumption that the act of maintaining an erect posture could be viewed, in part, as a stochastic process. Twenty-five healthy young subjects were studied under quite-standing conditions. Center-of-pressure (COP) trajectories were analyzed as one-dimensional and two-dimensional random walks. This novel approach led to the extraction of repeatable, physiologically meaningful parameters from stabilograms. It is shown that although individual stabilograms for a single subject were highly variable and random in appearance, a consistent, subject-specific pattern emerged with the generation of averaged stabilogram-diffusion plots (mean square COP displacement vs time interval). In addition, significant inter-subject differences were found in the calculated results. This suggests that the steady-state behavior of the control mechanisms involved in maintaining erect posture can be quite variable even amongst a population of age-matched, anthropometrically similar, healthy individuals. These posturographic analyses also demonstrated that COP trajectories could be modelled as fractional Brownian motion and that at least two control systems-a short-term mechanism and a long-term mechanism-were operating during quit standing. More specifically, the present results suggest that over short-term intervals open-loop control schemes are utilized by the postural control system, whereas over long-term intervals closed-loop control mechanisms are called into play. This work strongly supports the position that much can be learned about the functional organization of the postural control system by studying the steady-state behavior of the human body during periods of undisturbed stance.

1,110 citations


"Stabilometric parameters are affect..." refers background in this paper

  • ...The parameters derived more closely from the Collins and De Luca theory [5] are moderately correlated with selected BF....

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  • ...In the present study we consider a modification of the original Collins and De Luca technique, with improvements in the parameter estimation procedure that increased parameter reliability [5]....

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  • ...After Collins and De Luca [4], who characterized the fractal properties of CoP time series during quiet stance by a framework of Brownian motions, two modes of postural control are usually looked for in the range 0....

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  • ...After Collins and De Luca [4], who characterized the fractal properties of CoP time series during quiet stance by a framework of Brownian motions, two modes of postural control are usually looked for in the range 0.01–10 s: open-loop (short term) and feedback (long term)....

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  • ...The inherent variability of all such measures in normal subjects has been largely debated [4,5,7,8]....

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