25 results match your criteria overestimate postural

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How Does Bariatric Surgery Affect Fall Risk Factors?

Obes Surg 2021 Apr 2. Epub 2021 Apr 2.

Research Centre in Physical Activity, Health and Leisure (CIAFEL), Faculty of Sport, University of Porto, Rua Dr. Plácido Costa, 91, 4200-450, Porto, Portugal.

Purpose: This study aimed to assess bariatric surgery (BS) effect on fall risk factors.

Materials And Methods: Fifteen patients undergoing BS (intervention group, IG) and 10 non-surgical obese patients (control group, CG) were recruited. IG was assessed at pre-surgery and 6 months after BS, while CG was assessed at baseline and reassessed after 6 months. Read More

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Equimetrix Device: Criteria Based Validation and Reliability Analysis of the Center of Mass and Base of Support of a Human Postural Assessment System.

Sensors (Basel) 2021 Jan 7;21(2). Epub 2021 Jan 7.

Porto Biomechanics Laboratory, University of Porto (LABIOMEP-UP), 4200-450 Porto, Portugal.

Human postural control is a fundamental ability for static and dynamic tasks, especially in hiper- and hipo-functional populations, such as the elderly. The Equimetrix is a clinical device developed to assess both the base of support (BoS) and the center of mass (CoM) dynamics, thus allowing their use as new evaluation and training tools. This study aims to perform a criteria based validation of Equimetrix by comparing the BoS and CoM data with gold-standard equipment. Read More

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January 2021

Motor Function Relating to the Accuracy of Self-Overestimation Error in Community-Dwelling Older Adults.

Front Neurol 2020 30;11:599787. Epub 2020 Nov 30.

Department of Physical Therapy, Faculty of Health Science, Ryotokuji University, Urayasu, Japan.

Older adults often overestimate their motor performance, which represents a serious safety hazard. The cause of this self-overestimation is to date, not yet fully established. Thus, the present study aimed to reveal the factors associated with self-overestimation by focusing on motor function. Read More

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November 2020

Relevant parameters for recommendations of physical activity in patients suffering from multiple myeloma : A pilot study.

Wien Klin Wochenschr 2020 Mar 29;132(5-6):124-131. Epub 2019 Nov 29.

Department of Physical Medicine, Rehabilitation and Occupational Medicine, Medical University of Vienna, Waehringer Gürtel 18-20, 1090, Vienna, Austria.

Purpose: This pilot study aimed to describe physical performance, self-reported physical activity, health-related quality of life, anxiety and depression in patients who were assigned from Austrian self-help groups for multiple myeloma patients. These parameters were then discussed in the context of clinical decision-making concerning the recommended type of regular physical activity and exercise.

Methods: Members of the self-help groups were invited to participate. Read More

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Impact of Children's Postural Variation on Viewing Distance and Estimated Visual Acuity.

Transl Vis Sci Technol 2019 Jan 30;8(1):16. Epub 2019 Jan 30.

School of Optometry and Vision Science, The University of Auckland, Auckland, New Zealand.

Purpose: Reliable estimation of visual acuity requires that observers maintain a constant distance from the target, but use of chin rests is not always feasible. Our aim was to quantify children's movement during community testing and its impact on near (40 cm) and intermediate (150 cm) acuity measures.

Methods: Thirty-three 7-year-old children performed several acuity tests run on a tablet computer, administered in the child's home by a trained lay screener. Read More

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January 2019

Pushing people to their tipping point: Phenomenal tipping point is predicted by phenomenal vertical and intuitive beliefs.

Atten Percept Psychophys 2019 Feb;81(2):476-488

Department of Psychology, The Ohio State University - Mansfield, 1760 University Drive, Mansfield, OH, 44906, USA.

Previous work has shown that people overestimate their own body tilt by a factor of about 1.5, the same factor by which people overestimate geographical and man-made slopes. In Experiment 1 we investigated whether people can accurately identify their own and others' tipping points (TPs) - the point at which they are tilted backward and would no longer be able to return to upright - as well as their own and others' center of mass (COM) - the relative position of which is used to determine actual TP. Read More

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February 2019

We-Measure: Toward a low-cost portable posturography for patients with multiple sclerosis using the commercial Wii balance board.

J Neurol Sci 2015 Dec 14;359(1-2):440-4. Epub 2015 Oct 14.

Department of Neurology and Psychiatry, Sapienza University, Rome, Italy. Electronic address:

This study was aimed at investigating whether postural sway measures derived from a standard force platform were similar to those generated by a custom-written software ("We-Measure") acquiring and processing data from a commercial Nintendo balance board (BB). For this purpose, 90 patients with multiple sclerosis (MS) and 50 healthy controls (HC) were tested in a single-day session with a reference standard force platform and a BB-based system. Despite its acceptable between-device agreement (tested by visual evaluation of Bland-Altman plot), the low-cost BB-based system tended to overestimate postural sway when compared to the reference standard force platform in both MS and HC groups (on average +30% and +54%, respectively). Read More

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December 2015

Walking Distance as a Predictor of Falls in People With Multiple Sclerosis.

Physiother Res Int 2016 Jun 17;21(2):102-8. Epub 2015 Mar 17.

Faculty of Medicine and Health, Örebro University Hospital, Örebro, Sweden.

Background And Purpose: People with multiple sclerosis (PwMS) experience falls, usually when walking and transferring. The aim was to investigate if walking distance and patient overestimate of walking distance are predictors of falls in PwMS.

Methods: A prospective study was conducted, with a single test occasion followed by prospective registration of falls for 3 months. Read More

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Is the size of the useful field of view affected by postural demands associated with standing and stepping?

Neurosci Lett 2014 Apr 26;566:27-31. Epub 2014 Feb 26.

Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Liverpool, United Kingdom.

The useful field of view (UFOV) is the visual area from which information is obtained at a brief glance. While studies have examined the effects of increased cognitive load on the visual field, no one has specifically looked at the effects of postural control or locomotor activity on the UFOV. The current study aimed to examine the effects of postural demand and locomotor activity on UFOV performance in healthy young adults. Read More

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Compressing movement information via principal components analysis (PCA): contrasting outcomes from the time and frequency domains.

Hum Mov Sci 2013 Dec 11;32(6):1495-511. Epub 2013 Nov 11.

Department of Human Development and Family Studies, The Pennsylvania State University, United States. Electronic address:

PCA has become an increasingly used analysis technique in the movement domain to reveal patterns in data of various kinds (e.g., kinematics, kinetics, EEG, EMG) and to compress the dimension of the multivariate data set recorded. Read More

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December 2013

Effect of sertraline on risk of falling in older adults with psychotic depression on olanzapine: results of a randomized placebo-controlled trial.

Am J Geriatr Psychiatry 2014 Apr 2;22(4):332-6. Epub 2013 May 2.

Department of Psychiatry, Weill Medical College of Cornell University and New York Presbyterian Hospital-Westchester Division, NY.

Objective: Observational studies report that selective serotonin reuptake inhibitor (SSRI) antidepressants are associated with an increased risk of falls in the elderly, but these studies may overestimate drug-specific risk because of confounding. A randomized controlled trial (RCT) is the optimal way to assess the causal relationship between use of an SSRI and falls. We therefore analyzed data from a RCT of the treatment of psychotic depression, to examine whether combined olanzapine and sertraline interacted with older age to increase the risk of falling compared with olanzapine plus placebo. Read More

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In the elderly, failure to update internal models leads to over-optimistic predictions about upcoming actions.

PLoS One 2013 9;8(1):e51218. Epub 2013 Jan 9.

Département de Psychologie, Université Lille Nord de France (Lille 3), Villeneuve d'Ascq, France.

Before an action is performed, the brain simulates the body's dynamic behavior in relation to the environment, estimates the possible outcomes and assesses the feasibility of potential actions. Here, we tested a hypothesis whereby age-related changes in sensorimotor abilities result in failure to update internal models of action in the elderly. Young and older adults were required to judge in advance whether or not they could stand on an inclined plane (Experiment 1). Read More

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[The overestimation of performance: a specific bias of aging?].

Geriatr Psychol Neuropsychiatr Vieil 2011 Sep;9(3):287-94

Pavillon de médecine gériatrique, CHR de Roubaix, Hôpital Victor Provo, Roubaix.

The decline of postural abilities with age leads to increased falls. In this study, we suggest that a disturbance in the perception of postural affordances, characterized by an overestimation of performance, could be a major risk of falls specifically in the elderly. In addition, we test the possible link between the overestimation of capabilities and postural balance as we know degraded in the elderly. Read More

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September 2011

Walking speed and distance in different environments of subjects in the later stage post-stroke.

Physiother Theory Pract 2010 Nov 22;26(8):519-27. Epub 2010 Jul 22.

Institute of Neuroscience and Physiology, Section of Clinical Neuroscience and Rehabilitation Medicine, University of Gothenburg, Gothenburg, Sweden.

The purpose of this study is to assess short- and long-distance walking performance in indoor and outdoor environments of slow and fast walkers' subjects living in the community in the later stage post-stroke. Thirty-six subjects with at least 6 months post-stroke were included and divided into two groups based on their walking speed in the clinical setting. Thirty-meter walk tests (30 mWT) at self-selected and maximum speeds were assessed in three environments: (1) clinical setting; (2) basement setting; and (3) outdoor setting. Read More

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November 2010

Do children perceive postural constraints when estimating reach or action planning?

J Mot Behav 2009 Mar;41(2):100-5

Texas A&M University, College Station, TX 77843-4243, USA.

Estimation of whether an object is reachable from a specific body position constitutes an important aspect in effective motor planning. Researchers who estimate reachability by way of motor imagery with adults consistently report the tendency to overestimate, with some evidence of a postural effect (postural stability hypothesis). This idea suggests that perceived reaching limits depend on an individual's perceived postural constraints. Read More

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Older fallers with poor working memory overestimate their postural limits.

Arch Phys Med Rehabil 2008 Jul;89(7):1335-40

Centre for Hip Health, Vancouver Coastal Health Research Institute, University of British Columbia, Vancouver, BC, Canada.

Objective: To compare the accuracy of perceived postural limits between older fallers with good working memory and those with poor working memory.

Design: Cross-sectional study.

Setting: Research laboratory. Read More

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The subjective visual vertical in a nonhuman primate.

J Vis 2008 Mar 24;8(3):19.1-8. Epub 2008 Mar 24.

Center for Neurology, Hertie Institute for Clinical Brain Research, Department of Cognitive Neurology, University of Tuebingen, Tuebingen, Germany.

We perceive the visual world as upright as our visual system used information on the orientation of the body to update the internal representation of the visual scene. In humans, this updating is not perfect, thus leading to distortions of the subjective visual vertical. For small roll-tilt angles (<60 degrees ), subjects overestimate the body tilt (E-effect), whereas for larger angles they underestimate it (A-effect). Read More

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The impact of arm position on the measurement of orthostatic blood pressure.

J Emerg Med 2008 May 4;34(4):377-82. Epub 2008 Jan 4.

Department of Emergency Medicine, University of California, San Diego Medical Center, San Diego, California 92103, USA.

Blood pressure is a standard vital sign in patients evaluated in an Emergency Department. The American Heart Association has recommended a preferred position of the arm and cuff when measuring blood pressure. There is no formal recommendation for arm position when measuring orthostatic blood pressure. Read More

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Examining the effects of postural constraints on estimating reach.

J Mot Behav 2007 Jul;39(4):242-6

Texas A&M University, College Station, TX 77843-4243, USA.

The tendency to overestimate has consistently been reported in studies of reachability estimation. According to one of the more prominent explanations, the postural stability hypothesis, the perceived reaching limit depends on the individual's perceived postural constraints. To test that proposition, the authors compared estimates of reachability of 38 adults (a) in the seated posture (P1) and (b) in the more demanding posture of standing on one foot and leaning forward (P2). Read More

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Literature review and pilot studies of the effect of QT correction formulas on reported beta2-agonist-induced QTc prolongation.

Clin Ther 2006 Apr;28(4):582-90

Department of Medicine, University of California, San Diego 92103-8341, USA.

Background: Drugs that stimulate the beta2-adrenergic receptor have been reported to prolong the QT interval corrected for heart rate (QTc interval), a potential mechanism for cardiac toxicity.

Objective: This study evaluated whether beta2-adrenergic agonist drugs prolong the QTc interval when different correction formulas for the effect of heart rate are used.

Methods: Healthy subjects of both sexes aged 19 to 33 years were recruited with advertisements. Read More

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Visual cues and perceived reachability.

Brain Cogn 2005 Dec 9;59(3):287-91. Epub 2005 Sep 9.

Texas A&M University, USA.

A rather consistent finding in studies of perceived (imagined) compared to actual movement in a reaching paradigm is the tendency to overestimate at midline. Explanations of such behavior have focused primarily on perceptions of postural constraints and the notion that individuals calibrate reachability in reference to multiple degrees of freedom, also known as the whole-body explanation. The present study examined the role of visual information in the form of binocular and monocular cues in perceived reachability. Read More

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December 2005

Common reference system for estimation of the postural and subjective visual vertical.

Ann N Y Acad Sci 2003 Oct;1004:516-20

Department of Neurology, University of Zürich, Zürich, Switzerland.

When tilted subjects are asked to set a luminous line to the perceived earth-vertical in a dark surrounding, they systematically underestimate the true direction of earth-vertical at large tilt angles, a phenomenon first described by Aubert (A-phenomenon). At small tilt angles, subjects usually overestimate the direction of earth-vertical. Overestimation has been first reported by Müller, who termed the notion of E-phenomenon. Read More

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October 2003

Perception of postural limits in elderly nursing home and day care participants.

J Gerontol A Biol Sci Med Sci 1999 Mar;54(3):B124-30; discussion B131

Department of Orthopedic Surgery, San Francisco General Hospital, USA.

This study explored whether, when compared to young community-dwelling individuals, elderly nursing home and day care participants have less accurate perceptions of their postural stability borders (postural limits). Subjects estimated their performance before executing maximum forward reaches while maintaining the feet stationary. Whereas young subjects tended to underestimate their reaching limits, elderly subjects displayed no significant difference between estimated and actual values. Read More

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Can visual perception be used to estimate body part angles?

Ergonomics 1993 Apr;36(4):323-9

Department of Mechanical Industrial and Nuclear Engineering, University of Cincinnati, OH 45221-0116.

For two decades, observational methods have been used to measure postural loads in industry. These methods depend on the analyst's judgment to characterize correctly the working postures. The errors associated with estimating the body part's angular deviation from the neutral position are not known. Read More

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A problem intrinsic to the measurements of the pulmonary extravascular water volume by the thermal-dye technic with the sampling site in the bifurcation of the aorta. Thermal equilibrium with the aortic wall.

Jpn Circ J 1985 Mar;49(3):301-10

When estimating the pulmonary extravascular water volume (PEWV) as the lung thermal volume (LTV), by the double indicator dilution technic using heat and indocyanine green (ICG), a part of the left ventricular wall comes to the thermal equilibrium, and this leads to an overestimation of PEWV, when the samplings are made in the aortic root. In a previous study from this laboratory, this overestimation was approximately 10% of the measured LTV in the aortic root. In the present study, we evaluated the extent to which the thermal equilibrium with the aortic wall would cause LTV to slightly overestimate PEWV. Read More

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