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Postural stability

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https://www.readbyqxmd.com/read/28533748/cerebral-dynamics-during-the-observation-of-point-light-displays-depicting-postural-adjustments
#1
Eduardo F Martins, Thiago Lemos, Ghislain Saunier, Thierry Pozzo, Daniel Fraiman, Claudia D Vargas
Objective: As highly social creatures, human beings rely part of their skills of identifying, interpreting, and predicting the actions of others on the ability of perceiving biological motion. In the present study, we aim to investigate the electroencephalographic (EEG) cerebral dynamics involved in the coding of postural control and examine whether upright stance would be codified through the activation of the temporal-parietal cortical network classically enrolled in the coding of biological motion. Design: We registered the EEG activity of 12 volunteers while they passively watched point light displays (PLD) depicting quiet stable (QB) and an unstable (UB) postural situations and their respective scrambled controls (QS and US)...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28531243/increased-postural-sway-during-quiet-stance-as-a-risk-factor-for-prospective-falls-in-community-dwelling-elderly-individuals
#2
Jonas Johansson, Anna Nordström, Yngve Gustafson, Göran Westling, Peter Nordström
Objective: fall-related injuries constitute major health risks in older individuals, and these risks are projected to increase in parallel with increasing human longevity. Impaired postural stability is a potential risk factor related to falls, although the evidence is inconclusive, partly due to the lack of prospective studies. This study aimed to investigate how objective measures of postural sway predict incident falls. Design, setting and participants: this prospectively observational study included 1,877 community-dwelling individuals aged 70 years who participated in the Healthy Ageing Initiative between June 2012 and December 2015...
May 22, 2017: Age and Ageing
https://www.readbyqxmd.com/read/28527232/three-dimensional-evaluation-of%C3%A2-postural%C3%A2-stability-in-parkinson-s-disease-with-mobile-technology
#3
Sarah J Ozinga, Mandy Miller Koop, Susan M Linder, Andre G Machado, Tanujit Dey, Jay L Alberts
BACKGROUND: Postural instability is a hallmark of Parkinson's disease. Objective metrics to characterize postural stability are necessary for the development of treatment algorithms to aid in the clinical setting. OBJECTIVE: The aim of this project was to validate a mobile device platform and resultant three-dimensional balance metric that characterizes postural stability. METHODS: A mobile Application was developed, in which biomechanical data from inertial sensors within a mobile device were processed to characterize movement of center of mass in the medial-lateral, anterior-posterior and trunk rotation directions...
May 13, 2017: NeuroRehabilitation
https://www.readbyqxmd.com/read/28527231/nordic-walking-improves-trunk-stability-and%C3%A2-gait-spatial-temporal-characteristics-in%C3%A2-people-with-parkinson-disease
#4
Marie-Anne Gougeon, Lei Zhou, Julie Nantel
BACKGROUND: This study aimed to assess the effect of walking with Nordic walking (NW) poles on postural stability and gait spatial-temporal characteristics in individuals with PD and to determine the cognitive load associated operating the poles. METHODS: Twelve individuals with PD (age: 61.6±11.7) were asked to perform four 90 s walking trials; with/without poles and with/without verbal fluency task (category fluency) after a 6-week independent NW training. We assessed gait spatial-temporal characteristics, and trunk postural stability using the APDM accelerometry system...
May 13, 2017: NeuroRehabilitation
https://www.readbyqxmd.com/read/28509584/the-influence-of-the-crutch-setup-on-stability-and-weight-bearing-parameters-in-post-total-hip-replacement-surgery-patients-during-quiet-standing
#5
Francesco Esposito, Marco Freddolini, Leonardo Latella, Palmina Braccio, Massimiliano Marcucci, Andrea Corvi
PURPOSE: The purpose of this study is to evaluate the influence of the crutch setup on standing, in post total hip replacement (THR) surgery patients. MATERIALS AND METHODS: Thirty patients after THR were randomly assigned to walking with the elbow flexed (EF) or elbow straight (ES) crutch setup. Subjects were asked to stand on a force platform in a comfortable position with the crutch positioned on the unaffected side, facing forward for 10 seconds. Centre of pressure total path and maximal excursion were evaluated in both medio-lateral and anterior-posterior planes...
May 16, 2017: Disability and Rehabilitation. Assistive Technology
https://www.readbyqxmd.com/read/28507630/relationship-between-gait-parameters-and-postural-stability-in-early-and-late-parkinson-s-disease-and-visual-feedback-based-balance-training-effects
#6
Mohieldin M Ahmed, Douaa M Mosalem, Aziz K Alfeeli, Ayyoub B Baqer, Doaa Youssry Soliman
BACKGROUND: Gait disorders or postural instability has been done before. However, lack of reviews has addressed the relation between gait and postural stability in Parkinson's disease (PD). AIM: The aim was to evaluate the relation between gait parameters and postural stability in early and late stages of PD. MATERIALS AND METHODS: The forty-one idiopathic PD patients were divided into two groups into a group (A) considered as early PD and group (B) considered as late ambulant PD...
April 15, 2017: Open Access Macedonian Journal of Medical Sciences
https://www.readbyqxmd.com/read/28505502/sleep-in-the-northern-fur-seal
#7
REVIEW
Oleg I Lyamin, Lev M Mukhametov, Jerome M Siegel
The pattern of sleep in the fur seal, a semiaquatic pinniped, has several striking behavioral and physiological adaptations that allow this species to inhabit both the land and water environment. These features include unihemispheric slow wave sleep (USWS, also being unihemispheric waking), the ability to maintain movement for stabilization of the sleep posture and to briefly open one eye while having a sleep electroencephalogram (EEG) in one hemisphere. In vivo microdialysis studies suggest that acetylcholine release is required for cortical activation during USWS, and that monoamines are not required for USWS...
May 12, 2017: Current Opinion in Neurobiology
https://www.readbyqxmd.com/read/28504979/congenital-deafness-alters-sensory-weighting-for-postural-control
#8
Maxime Maheu, Andréanne Sharp, Sara Pagé, François Champoux
OBJECTIVES: The aim of this study was to examine sensory reweighting for postural control in congenitally deaf individuals. DESIGN: We studied 14 controls and 14 deaf age-matched individuals using a force platform and the modified clinical test of sensory interaction and balance protocol. Both groups performed the postural tasks without auditory cues (with hearing protectors for controls or without hearing devices for the deaf). RESULTS: The results confirmed poorer postural stability in the deaf...
May 12, 2017: Ear and Hearing
https://www.readbyqxmd.com/read/28501732/asymmetrical-stabilization-and-mobilization-exploited-during-static-single-leg-stance-and-goal-directed-kicking
#9
Adam C King, Zheng Wang
The motor control properties of the right and left legs are dependent on the stabilization and mobilization features of the motor tasks. The current investigation examined the right and left leg control differences - interlateral asymmetries - during static single leg stance and dynamic goal directed kicking with an emphasis of the asymmetrical stabilization and mobilization components of movements. Ten young, healthy, right-leg preferred individuals with minimal kicking experience completed both tests on each limb...
May 11, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28500909/development-and-testing-of-a-moment-based-coactivation-index-to-assess-complex-dynamic-tasks-for-the-lumbar-spine
#10
Peter Le, Alexander Aurand, Jonathan S Dufour, Gregory G Knapik, Thomas M Best, Safdar N Khan, Ehud Mendel, William S Marras
BACKGROUND: Many methods exist to describe coactivation between muscles. However, most methods have limited capability in the assessment of coactivation during complex dynamic tasks for multi-muscle systems such as the lumbar spine. The ability to assess coactivation is important for the understanding of neuromuscular inefficiency. In the context of this manuscript, inefficiency is defined as the effort or level of coactivation beyond what may be necessary to accomplish a task (e.g., muscle guarding during postural stabilization)...
May 5, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28499747/preoperative-posturing-of-patients-with-macula-on-retinal-detachment-reduces-progression-toward-the-fovea
#11
Jan H de Jong, Juan P Vigueras-Guillén, Tiarah C Simon, Reinier Timman, Tunde Peto, Koenraad A Vermeer, Jan C van Meurs
PURPOSE: Traditionally, preoperative posturing consisting of bed rest and positioning is prescribed to patients with macula-on retinal detachment (RD) to prevent RD progression and detachment of the fovea. Execution of such advice can be cumbersome and expensive. This study aimed to investigate if preoperative posturing affects the progression of RD. DESIGN: Prospective cohort study. PARTICIPANTS: Ninety-eight patients with macula-on RD were included...
May 9, 2017: Ophthalmology
https://www.readbyqxmd.com/read/28493067/visuotactile-interaction-even-in-far-sagittal-space-in-older-adults-with-decreased-gait-and-balance-functions
#12
Wataru Teramoto, Keito Honda, Kento Furuta, Kaoru Sekiyama
Spatial proximity of signals from different sensory modalities is known to be a crucial factor in facilitating efficient multisensory processing in young adults. However, recent studies have demonstrated that older adults exhibit strong visuotactile interactions even when the visual stimuli were presented in a spatially disparate position from a tactile stimulus. This suggests that visuotactile peripersonal space differs between older and younger adults. In the present study, we investigated to what extent peripersonal space expands in the sagittal direction and whether this expansion was linked to the decline in sensorimotor functions in older adults...
May 10, 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/28493066/cognition-and-balance-control-does-processing-of-explicit-contextual-cues-of-impending-perturbations-modulate-automatic-postural-responses
#13
Daniel Boari Coelho, Luis Augusto Teixeira
Processing of predictive contextual cues of an impending perturbation is thought to induce adaptive postural responses. Cueing in previous research has been provided through repeated perturbations with a constant foreperiod. This experimental strategy confounds explicit predictive cueing with adaptation and non-specific properties of temporal cueing. Two experiments were performed to assess those factors separately. To perturb upright balance, the base of support was suddenly displaced backwards in three amplitudes: 5, 10 and 15 cm...
May 10, 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/28486863/the-influence-of-the-use-of-ankle-foot-orthoses-on-thorax-spine-and-pelvis-kinematics-during-walking-in-children-with-cerebral-palsy
#14
Eva Swinnen, Jean-Pierre Baeyens, Benjamin Van Mulders, Julian Verspecht, Marc Degelaen
BACKGROUND: To improve gait function in children with cerebral palsy, ankle-foot orthoses are often prescribed. However, until now, little attention has been devoted to the effect of ankle-foot orthoses on the postural control during walking in children with cerebral palsy. OBJECTIVES: The aim was to compare the differences in thorax, spine, and pelvis movements in children with cerebral palsy during walking barefoot and walking with ankle-foot orthoses. STUDY DESIGN: Clinical study with an intra subject design...
May 1, 2017: Prosthetics and Orthotics International
https://www.readbyqxmd.com/read/28485669/postural-stability-in-a-population-of-dancers-healthy-non-dancers-and-vestibular-neuritis-patients
#15
Eduardo Martin-Sanz, Isabel Ortega Crespo, Jonathan Esteban-Sanchez, Ricardo Sanz
INTRODUCTION: Several studies have indicated better balance control in dancers than in control participants, but some controversy remains. The aim of our study is to evaluate the postural stability in a cohort of dancers, non-dancers, compensated, and non-compensated unilateral vestibular neuritis (VN). METHODS: This is a prospective study of control subjects, dancers, and VN patients between June 2009 and December 2015. Dancers from the Dance Conservatory of Madrid and VN patients were referred to our department for analysis...
May 9, 2017: Acta Oto-laryngologica
https://www.readbyqxmd.com/read/28485653/vestibular-rehabilitation-in-benign-paroxysmal-positional-vertigo-reality-or-fiction
#16
Federica Bressi, Paola Vella, Manuele Casale, Antonio Moffa, Lorenzo Sabatino, Michele Antonio Lopez, Francesco Carinci, Rocco Papalia, Fabrizio Salvinelli, Silvia Sterzi
The objective of this article is to systematically review the evidence on the effectiveness of vestibular rehabilitation (VR) in patients with benign paroxysmal positional vertigo (BPPV). Relevant published studies about VR in BPPV were searched in PubMed, Google Scholar and Ovid using various keywords. We included trials that were available in the English language and did not apply publication year or publication status restrictions. Studies based on the VR in other peripheral and/or central balance disorders are excluded...
May 1, 2017: International Journal of Immunopathology and Pharmacology
https://www.readbyqxmd.com/read/28479946/the-effect-of-military-load-carriage-on-postural-sway-forward-trunk-lean-and-pelvic-girdle-motion
#17
Eileen M Strube, Andrea Sumner, Roger Kollock, Kenneth E Games, Marie A Lackamp, Masahiro Mizutani, Joellen M Sefton
Musculoskeletal injuries are a common occurrence in military service members. It is believed that the load carried by the service member impedes stability and alters back and pelvis kinematics, increasing their susceptibility to musculoskeletal injuries, specifically in the lower extremities. The purpose of this study was to examine the effects of two different loads on postural sway, forward trunk lean, and pelvic girdle motion in United States Army Cadets. Twenty male Army Reserve Officers' Training Corps Cadets participated in this study...
2017: International Journal of Exercise Science
https://www.readbyqxmd.com/read/28477042/unintentional-drifts-during-quiet-stance-and-voluntary-body-sway
#18
Omid Rasouli, Stanisław Solnik, Mariusz P Furmanek, Daniele Piscitelli, Ali Falaki, Mark L Latash
We explored unintentional drifts in voluntary whole-body sway tasks following the removal of visual feedback. The main hypothesis was that the unintentional drifts were produced by drifts of referent coordinates for salient performance variables. Young healthy subjects stood quietly on a force platform and also performed voluntary body sway at 0.5 Hz both in the anterio-posterior and medio-lateral directions. Visual feedback on the center of pressure (COP) coordinate was provided and then turned off. During quiet stance trials, the subjects matched the initial COP coordinate with a target shifted by 3 cm anterior, posterior, left, or right from the coordinate during natural standing and activated the right tibialis anterior to 30% of its maximal voluntary contraction...
May 5, 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/28473404/graded-association-between-kidney-function-and-impaired-orthostatic-blood-pressure-stabilization-in-older-adults
#19
Mark Canney, Matthew D L O'Connell, Donal J Sexton, Neil O'Leary, Rose Anne Kenny, Mark A Little, Conall M O'Seaghdha
BACKGROUND: Impaired orthostatic blood pressure (BP) stabilization is highly prevalent in older adults and is a predictor of end-organ injury, falls, and mortality. We sought to characterize the relationship between postural BP responses and the kidney. METHODS AND RESULTS: We performed a cross-sectional analysis of 4204 participants from The Irish Longitudinal Study on Ageing, a national cohort of community-dwelling adults aged ≥50 years. Beat-to-beat systolic and diastolic BP were measured during a 2-minute active stand test...
May 4, 2017: Journal of the American Heart Association
https://www.readbyqxmd.com/read/28459950/tremor-stability-index-a-new-tool-for-differential-diagnosis-in-tremor-syndromes
#20
Lazzaro di Biase, John-Stuart Brittain, Syed Ahmar Shah, David J Pedrosa, Hayriye Cagnan, Alexandre Mathy, Chiung Chu Chen, Juan Francisco Martín-Rodríguez, Pablo Mir, Lars Timmerman, Petra Schwingenschuh, Kailash Bhatia, Vincenzo Di Lazzaro, Peter Brown
Misdiagnosis among tremor syndromes is common, and can impact on both clinical care and research. To date no validated neurophysiological technique is available that has proven to have good classification performance, and the diagnostic gold standard is the clinical evaluation made by a movement disorders expert. We present a robust new neurophysiological measure, the tremor stability index, which can discriminate Parkinson's disease tremor and essential tremor with high diagnostic accuracy. The tremor stability index is derived from kinematic measurements of tremulous activity...
April 27, 2017: Brain: a Journal of Neurology
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