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vestibular center of pressure

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https://www.readbyqxmd.com/read/29079459/effect-of-noisy-galvanic-vestibular-stimulation-on-center-of-pressure-sway-of-static-standing-posture
#1
Yasuto Inukai, Naofumi Otsuru, Mitsuhiro Masaki, Kei Saito, Shota Miyaguchi, Sho Kojima, Hideaki Onishi
BACKGROUND: The vestibular system is involved in the control of standing balance. Galvanic vestibular stimulation (GVS) is a noninvasive technique that can stimulate the vestibular system. In recent years, noisy GVS (nGVS) using noise current stimulation has been attempted, but it has not been clarified whether it affects postural sway in open-eye standing. OBJECTIVE: The purpose of this study was to clarify the influence of nGVS on the center of pressure (COP) sway measurement in open-eye standing postural control and identify the responders of nGVS...
October 17, 2017: Brain Stimulation
https://www.readbyqxmd.com/read/28991916/the-essential-role-of-optical-flow-in-the-peripheral-visual-field-for-stable-quiet-standing-evidence-from-the-use-of-a-head-mounted-display
#2
Kentaro Horiuchi, Masami Ishihara, Kuniyasu Imanaka
It has long been thought that vision is the most essential factor in maintaining stable quiet standing compared to other sources (i.e., vestibular and somatosensory inputs) of information. Specifically, several vision studies on postural control have shown evidence for the importance of the visual system, particularly peripheral vision rather than central vision, and optical flow. Nevertheless, to date, no study has manipulated both visual field and optical flow concurrently. In the present study, we experimentally manipulated both the visual field (the central and peripheral visual fields) and the occurrence of optical flow during quiet standing, examining the effects of the visual field and optical flow on postural sway measured in terms of the center of pressure (CoP)...
2017: PloS One
https://www.readbyqxmd.com/read/28931974/gaze-stabilization-exercises-derive-sensory-reweighting-of-vestibular-for-postural-control
#3
Yusuke Ueta, Akiyoshi Matsugi, Kosuke Oku, Kojiro Okuno, Yoshiki Tamaru, Shohei Nomura, Hiroaki Tanaka, Shinya Douchi, Nobuhiko Mori
[Purpose] The aim of this study was to investigate whether gaze stabilization exercise derives sensory reweighting of vestibular for upright postural control. [Subjects and Methods] Twenty-three healthy volunteers participated in this study. The center of pressure of the total trajectory length was measured before (pre), immediately after (post), and 10 min after (post10) gaze stabilization exercise, in the static standing position, with the eyes open or closed, on the floor or on foam rubber. The sensory contribution values of the visual, somatosensory, and vestibular systems were calculated using center of pressure of the total trajectory length value in these measuring conditions...
September 2017: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/28919878/postural-control-in-bilateral-vestibular-failure-its-relation-to-visual-proprioceptive-vestibular-and-cognitive-input
#4
Andreas Sprenger, Jann F Wojak, Nico M Jandl, Christoph Helmchen
Patients with bilateral vestibular failure (BVF) suffer from postural and gait unsteadiness with an increased risk of falls. The aim of this study was to elucidate the differential role of otolith, semicircular canal (SSC), visual, proprioceptive, and cognitive influences on the postural stability of BVF patients. Center-of-pressure displacements were recorded by posturography under six conditions: target visibility; tonic head positions in the pitch plane; horizontal head shaking; sensory deprivation; dual task; and tandem stance...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28822327/improvements-in-balance-control-in-individuals-with-pcs-detected-following-vestibular-training-a-case-study
#5
Alyssa Prangley, Mathew Aggerholm, Michael Cinelli
Concussed individuals have been found to experience balance deficits in the anterior-posterior (AP) direction as indicated by greater Center of Pressure (COP) displacement and velocity. One possible reason for this change in balance control could be due to damage to the lateral vestibulospinal tract which sends signals to control posterior muscles, specifically ankle extensors leading to compensatory torques about the ankle. The purpose of the study was to quantify balance assessments in individuals experiencing persistent post-concussion symptoms (PCS) to determine balance control changes following a vestibular training intervention...
October 2017: Gait & Posture
https://www.readbyqxmd.com/read/28802368/study-of-the-effects-of-hearing-on-static-and-dynamic-postural-function-in-children-using-cochlear-implants
#6
Malihah Mazaheryazdi, Abdollah Moossavi, Javad Sarrafzadah, Saeed Talebian, Shohreh Jalaie
OBJECTIVE: The present study aimed to evaluate the postural control perturbations by the center of pressure parameters in two main approaches, cochlear implant turned "on" and "off". METHODS: We included 25 children aged 8-10 years with unilateral cochlear implants and bilateral vestibular hypofunction deficit. To evaluate the postural function, each children was asked to stand on the force plate under 3 different conditions and cochlear implant turned "on" and "off": Condition (A) double stance from open eyes to closed eyes, Condition (B) double stance with open eyes engaging in the dual task and Condition (C) From double leg stance to one leg stance with open eyes for assessment of dynamic postural control...
September 2017: International Journal of Pediatric Otorhinolaryngology
https://www.readbyqxmd.com/read/28783491/adaptation-of-postural-recovery-responses-to-a-vestibular-sensory-illusion-in-individuals-with-parkinson-disease-and-healthy-controls
#7
Mark E Lester, James T Cavanaugh, K Bo Foreman, Scott W Shaffer, Robin Marcus, Leland E Dibble
BACKGROUND: The ability to adapt postural responses to sensory illusions diminishes with age and is further impaired by Parkinson disease. However, limited information exists regarding training-related adaptions of sensory reweighting in these populations. METHODS: This study sought to determine whether Parkinson disease or age would differentially affect acute postural recovery or adaptive postural responses to novel or repeated exposure to sensory illusions using galvanic vestibular stimulation during quiet stance...
July 26, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28767021/the-limits-of-stability-in-patients-with-unilateral-vestibulopathy
#8
Rafael Alvarez-Otero, Nicolas Perez-Fernandez
OBJECTIVE: To characterize the stability limits and region in patients with unilateral vestibulopathy according to the side of the lesion and determine if that imposes any bias. To analyze if the stability limits and region depend on the functional deficit as evaluated in the sensory organization test. METHODS: Forty patients with chronic dizziness and without any vertigo spell for least 6 months prior to testing. In all of them, a unilateral vestibulopathy was diagnosed clinically and at vestibular testing...
October 2017: Acta Oto-laryngologica
https://www.readbyqxmd.com/read/28687471/does-the-postural-variable-affect-the-determination-of-balance-compensation-level-in-vestibular-schwannoma-patients
#9
Julien Frère, Charles P Hoffmann, Gérome C Gauchard, Cécile Parietti-Winkler
Previous sensory organization test (SOT) outcomes provided evidences that the vestibular schwannoma (VS) removal led to acute and slow changes in the ability to use vestibular cues for balance control. However, the assumptions behind the equilibrium score (ES) are somewhat controversial within the literature. Therefore, we compared the time-course of balance control in eighteen VS patients across different postural variables. Analyses of variance and unsupervised clustering (k-means) were used to compare the whole dataset of four postural variables: ES, a modified ES which factored in the time before a fall (cES), the mean amplitude (MA) and the mean velocity (MV) of center of pressure displacements...
July 4, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28419063/the-effect-of-elevated-intracranial-pressure-on-frequency-tuning-of-air-conducted-ocular-vestibular-myogenic-potentials-in-m%C3%A3-ni%C3%A3-re-s-disease-patients
#10
Rebecca Maxwell, Claudia Jerin, Robert Gürkov
OBJECTIVE: To investigate the effect of increased intracranial pressure on ocular vestibular-evoked myogenic potential (oVEMP) amplitudes and frequency tuning in patients with Ménière's disease (MD) to elucidate whether oVEMPS recorded under such conditions could provide a simple and accurate diagnostic test for MD. SETTING: Tertiary referral center for otology and neurotology. PATIENTS: Ten patients with certain unilateral MD (mean age = 48...
July 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/28368883/effect-of-gaze-stabilization-exercises-on-vestibular-function-during-postural-control
#11
Akiyoshi Matsugi, Yusuke Ueta, Kosuke Oku, Kojiro Okuno, Yoshiki Tamaru, Shohei Nomura, Hiroaki Tanaka, Nobuhiko Mori
Gaze-stabilization exercise (GSE) is often conducted in vestibular rehabilitation, but its effect on vestibular function in postural control is not clear. We investigated whether GSE affects vestibular function during static upright standing and vestibulospinal reflex (VSR) in healthy young adults. First, the center of pressure of the total trajectory length (CoP-L) was measured before each GSE task or control (only standing) task (pre), immediately after (post), and 10 min after (post10) in the static standing position on foam rubber with the eyes open or closed (EC)...
May 24, 2017: Neuroreport
https://www.readbyqxmd.com/read/28351744/dynamical-analysis-of-balance-in-vestibular-schwannoma-patients
#12
Charles P Hoffmann, Benoît Seigle, Julien Frère, Cécile Parietti-Winkler
The analysis of the complexity of postural fluctuations is a recent method for assessing postural control. Complexity relates to the irregularity of the center of pressure time series and characterizes the ability of postural control to meet a changing environment. In our study, we used the sample entropy (SampEn) parameter to evaluate the complexity of postural sway velocity time series in patients with vestibular schwannoma (n=19) compared to healthy controls (n=20), using the sensory organization test. Patients performed postural assessments three days before surgical ablation of the tumor, then three times after surgery, at eight, thirty, and ninety days...
March 9, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28346894/the-romberg-ratio-in-people-with-multiple-sclerosis
#13
Alon Kalron
Postural control relies on the integration of inputs from the visual, somatosensory and vestibular systems which are frequently impaired in people with Multiple Sclerosis (PwMS). In this situation, examining the Romberg ratio can be useful. This parameter can be interpreted as a gross indicator of a vestibular and proprioceptive contribution to postural control. Therefore, the primary objective of the current study was to examine whether the Romberg ratio differs between MS fallers, non-fallers and neurological disability levels...
March 14, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28256416/the-triage-score-for-vertigo-or-dizziness-a-diagnostic-model-for-stroke-in-the-emergency-department
#14
R Kuroda, T Nakada, T Ojima, M Serizawa, N Imai, N Yagi, A Tasaki, M Aoki, T Oiwa, T Ogane, K Mochizuki, M Kobari, H Miyajima
BACKGROUND: Vertigo or dizziness is a common occurrence, but it remains a challenging symptom when encountered in the emergency department (ED). A diagnostic score for stroke with high accuracy is therefore required. METHODS: A single-center observational study (498 patients) was conducted. The predictor variables were derived from a multivariate logistic regression analysis with Akaike information criterion. The outcome was the occurrence of stroke. We evaluated the utility of a new diagnostic score (TriAGe+) and compared it with the ABCD2 score...
February 27, 2017: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
https://www.readbyqxmd.com/read/28195999/clinical-significance-of-arterial-stiffness-and-metabolic-syndrome-scores-in-vestibular-neuritis
#15
Jae Ho Chung, Seung Hwan Lee, Chul Won Park, Jin Hyeok Jeong, Jeong-Hun Shin
OBJECTIVE: To investigate the clinical significance of cardiovascular factors, including arterial stiffness and metabolic syndrome scores, in the development of vestibular neuritis. STUDY DESIGN: A prospective, case-control study. SETTING: Tertiary referral center. PATIENTS: Fifty-eight adult patients with vestibular neuritis (VN) and 58 age- and sex-matched controls were evaluated between January 2015 and January 2016...
June 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/28032220/transoral-endoscopic-parathyroidectomy-vestibular-approach-a-novel-scarless-parathyroid-surgery
#16
Thanyawat Sasanakietkul, Pornpeera Jitpratoom, Angkoon Anuwong
BACKGROUND: Natural orifice transluminal endoscopic surgery developed for neck surgery become increasing popular. Herein, an innovative transoral endoscopic parathyroidectomy vestibular approach (TOEPVA) was developed for primary hyperparathyroidism (PHPT) and renal hyperparathyroidism (rHPT). METHODS: Incisions were made at the oral vestibule under the inferior lip. A 10-mm trocar was inserted through the center of the oral vestibule with two 5-mm trocars laterally...
December 28, 2016: Surgical Endoscopy
https://www.readbyqxmd.com/read/28032141/vestibular-control-of-standing-balance-is-enhanced-with-increased-cognitive-load
#17
Michael A McGeehan, Marjorie H Woollacott, Brian H Dalton
When cognitive load is elevated during a motor task, cortical inhibition and reaction time are increased; yet, standing balance control is often unchanged. This disconnect is likely explained by compensatory mechanisms within the balance system such as increased sensitivity of the vestibulomotor pathway. This study aimed to determine the effects of increased cognitive load on the vestibular control of standing balance. Participants stood blindfolded on a force plate with their head facing left and arms relaxed at their sides for two trials while exposed to continuous electrical vestibular stimulation (EVS)...
April 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/27812748/relationship-between-changes-in-vestibular-sensory-reweighting-and-postural-control-complexity
#18
Brian L Cone, Daniel J Goble, Christopher K Rhea
Complexity measures have become increasingly prominent in the postural control literature. Several studies have found associations between clinical balance improvements and complexity, but the relationship between sensory reweighting and complexity changes has remained unobserved. The purpose of this study was to determine the relationship between sensory reweighting via Wii Fit balance training and complexity. Twenty healthy adults completed 6 weeks of training. Participants completed the sensory organization test (SOT) before and after the sessions...
February 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/27749751/unilateral-hearing-loss-is-associated-with-impaired-balance-in-children-a-pilot-study
#19
Nikolaus E Wolter, Sharon L Cushing, Luis D Vilchez-Madrigal, Adrian L James, Jennifer Campos, Blake C Papsin, Karen A Gordon
OBJECTIVE: To determine if children with unilateral sensorineural hearing loss (UHL) demonstrate impaired balance compared with their normal hearing (NH) peers. STUDY DESIGN: Prospective, case-control study. METHODS: Balance was assessed in14 UHL and 14 NH children using the Bruininks-Oseretsky Test-2 (BOT-2) and time to fall (TTF) in an immersive, virtual-reality laboratory. Postural control was quantified by center of pressure (COP) using force plates...
December 2016: Otology & Neurotology
https://www.readbyqxmd.com/read/27642667/two-common-second-causes-of-dizziness-in-patients-with-m%C3%A3-ni%C3%A3-re-s-disease
#20
Babette F van Esch, Peter Paul G van Benthem, Hester J van der Zaag-Loonen, Tjasse D Bruintjes
OBJECTIVE: There are no epidemiological studies quantifying the prevalence of second causes of dizziness in Ménière's disease (MD). Therefore, we aimed to quantify which dizziness-inducing causes are prevalent alongside MD. Moreover, we analyzed which second cause of dizziness was more common in a specific age group and if age was a risk factor. STUDY DESIGN: Retrospective cohort study. SETTING: Tertiary referral center. METHODS: Data were retrospectively obtained from all MD patients who visited our clinic between January 2000 and December 2013...
December 2016: Otology & Neurotology
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