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Postural stability

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https://www.readbyqxmd.com/read/28923138/orientation-preferences-and-motion-sickness-induced-in-a-virtual-reality-environment
#1
Wei Chen, Jian-Gang Chao, Yan Zhang, Jin-Kun Wang, Xue-Wen Chen, Cheng Tan
BACKGROUND: Astronauts' orientation preferences tend to correlate with their susceptibility to space motion sickness (SMS). Orientation preferences appear universally, since variable sensory cue priorities are used between individuals. However, SMS susceptibility changes after proper training, while orientation preferences seem to be intrinsic proclivities. The present study was conducted to investigate whether orientation preferences change if susceptibility is reduced after repeated exposure to a virtual reality (VR) stimulus environment that induces SMS...
October 1, 2017: Aerospace Medicine and Human Performance
https://www.readbyqxmd.com/read/28919878/postural-control-in-bilateral-vestibular-failure-its-relation-to-visual-proprioceptive-vestibular-and-cognitive-input
#2
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/28916583/a-balance-and-proprioception-intervention-programme-to-enhance-combat-performance-in-military-personnel
#3
Shany Funk, T Jacob, D Ben-Dov, E Yanovich, O Tirosh, N Steinberg
BACKGROUND: Optimal functioning of the lower extremities under repeated movements on unstable surfaces is essential for military effectiveness. Intervention training to promote proprioceptive ability should be considered in order to limit the risk for musculoskeletal injuries. The aim of this study was to assess the effect of a proprioceptive intervention programme on static and dynamic postural balance among Israel Defense Forces combat soldiers. METHODS: Twenty-seven male soldiers, aged 18-20 years, from a physical fitness instructor's course, were randomly divided into two groups matched by age and army unit...
September 14, 2017: Journal of the Royal Army Medical Corps
https://www.readbyqxmd.com/read/28915903/a-quantitative-assessment-of-the-evolution-of-cerebellar-syndrome-in-children-with-phosphomannomutase-deficiency-pmm2-cdg
#4
Natalia Lourdes Serrano, Victor De Diego, Daniel Cuadras, Antonio F Martinez Monseny, Ramón Velázquez-Fragua, Laura López, Ana Felipe, Luis G Gutiérrez-Solana, Alfons Macaya, Belén Pérez-Dueñas, Mercedes Serrano
BACKGROUND: We aim to delineate the progression of cerebellar syndrome in children with phosphomannomutase-deficiency (PMM2-CDG) using the International Cooperative Ataxia Rating Scale (ICARS). We sought correlation between cerebellar volumetry and clinical situation. We prospectively evaluated PMM2-CDG patients aged from 5 to 18 years through ICARS at two different time points set apart by at least 20 months. We reviewed available MRIs and performed volumetric analysis when it was possible...
September 15, 2017: Orphanet Journal of Rare Diseases
https://www.readbyqxmd.com/read/28915097/synergies-and-motor-equivalence-in-voluntary-sway-tasks-the-effects-of-visual-and-mechanical-constraints
#5
Mariusz P Furmanek, Stanisław Solnik, Daniele Piscitelli, Omid Rasouli, Ali Falaki, Mark L Latash
The authors used two analyses developed within the framework of the uncontrolled manifold hypothesis to quantify multimuscle synergies during voluntary body sway: analysis of intertrial variance and analysis of motor equivalence with respect to the center of pressure (COP) trajectory. Participants performed voluntary sway tasks in the anteroposterior direction at 0.33 and 0.66 Hz. Muscle groups were identified in the space of muscle activations and used as elemental variables in the synergy analyses. Changing mechanical and vision feedback-based constraints led to significant changes in indices of sway performance such as COP deviations in the uninstructed, mediolateral direction and indices of spontaneous postural sway...
September 15, 2017: Journal of Motor Behavior
https://www.readbyqxmd.com/read/28914720/effects-of-corrective-exercise-for-thoracic-hyperkyphosis-on-posture-balance-and-well-being-in-older-women-a-double-blind-group-matched-design
#6
Hyun-Jeong Jang, Lynne C Hughes, Duck-Won Oh, Suhn-Yeop Kim
BACKGROUND AND PURPOSE: The purpose of this study was to identify the effects of a corrective exercise for thoracic hyperkyphosis on posture, balance, and well-being in Korean community-dwelling older women. METHODS: Fifty women 65 years of age and older, recruited from 2 senior centers, participated in this study. Participants were assigned to either the experimental group (EG) or the control group (CG) on the basis of convenience of location, and 22 in each were analyzed...
September 13, 2017: Journal of Geriatric Physical Therapy
https://www.readbyqxmd.com/read/28910658/postural-regulatory-strategies-during-quiet-sitting-are-affected-in-individuals-with-thoracic-spinal-cord-injury
#7
Matija Milosevic, Dany H Gagnon, Philippe Gourdou, Kimitaka Nakazawa
Thoracic spinal cord injury (SCI) can have significant negative consequences, which can affect the ability to maintain unsupported sitting. The objectives of this study were to compare postural control of individuals with high- and low-thoracic SCI to able-bodied people and evaluate the effects of upper-limb support on postural control during quiet sitting. Twenty-five individuals were recruited into: (a) high-thoracic SCI; (b) low-thoracic SCI; and (c) able-body subgroups. Participants were seated and asked to maintain a steady balance in the following postures: (1) both hands resting on thighs; (2) both arms crossed over the chest; and (3) both arms extended...
August 31, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28904967/foot-structure-in-boys-with-down-syndrome
#8
Ewa Puszczałowska-Lizis, Krzysztof Nowak, Jarosław Omorczyk, Tadeusz Ambroży, Przemysław Bujas, Leszek Nosiadek
INTRODUCTION AND AIM: Down syndrome (DS) is associated with numerous developmental abnormalities, some of which cause dysfunctions of the posture and the locomotor system. The analysis of selected features of the foot structure in boys with DS versus their peers without developmental disorders is done. MATERIALS AND METHODS: The podoscopic examination was performed on 30 boys with DS aged 14-15 years. A control group consisted of 30 age- and gender-matched peers without DS...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28900569/there-are-no-biomechanical-differences-between-runners-classified-by-the-functional-movement-screen
#9
Rodrigo Ribeiro de Oliveira, Shalimá Figueirêdo Chaves, Yuri Lopes Lima, Márcio Almeida Bezerra, Gabriel Peixoto Leão Almeida, Pedro Olavo de Paula Lima
BACKGROUND: Running has been one of the main choices of physical activity in people seeking an active lifestyle. The Functional Movement Screen (FMS™) is a screening tool that aims to discern movement competency. PURPOSE: The purposes of this study were to compare biomechanical characteristics between two groups rated using the composite FMS™ score, and to analyze the influence of specific individual tests. The hypothesis was that the group that scored above 14 would demonstrate better performance on biomechanical tests than the group that scored below 14...
August 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/28900567/the-comparison-of-the-lumbar-multifidus-muscles-function-between-gymnastic-athletes-with-sway-back-posture-and-normal-posture
#10
Elnaz Mahdavie, Asghar Rezasoltani, Leila Simorgh
BACKGROUND: The prevalence of sway back posture (SBP) is very high among elite gymnasts. This posture may be partly due to the improper function of lumbar multifidus muscles (LMM) as lumbar stabilizers muscles. PURPOSE: The aim of this study was to compare the thicknesses of LMM measured at rest and during the contraction elicited during an arm lift between elite gymnasts with SBP and normal posture. STUDY DESIGN: Observational, descriptive, comparative...
August 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/28895802/slip-and-trip-perturbations-during-an-object-transport-task-requiring-a-lateral-change-in-support
#11
Andrew H Huntley, Keaton A Inkol, Lori Ann Vallis
The ability to counteract destabilizing external forces while simultaneously executing a complex task presents a novel way to ascertain one's ability to generate adaptive postural control responses to avoid a potential fall. In this study, participants performed an upper limb object transport task requiring a lateral change in support on a robotic platform that could remain fixed in space or translated (mimicking a slip or trip perturbation). No significant stability differences were observed at initial recovery step between slip and trip perturbations...
September 12, 2017: Journal of Motor Behavior
https://www.readbyqxmd.com/read/28893391/the-effects-of-early-stages-of-aging-on-postural-sway-a-multiple-domain-balance-assessment-using-a-force-platform
#12
Adriana M Degani, Charles T Leonard, Alessander Danna-Dos-Santos
Technical advancements in instrumentation and analytical methods have improved the ability of assessing balance control. This study investigated the effects of early stages of aging on postural sway using traditional and contemporary postural indices from different domains. Eleven healthy young adults and fourteen healthy non-faller older adults performed two postural tasks: (a) functional limits of stability and (b) unperturbed bipedal stance for 120s. Postural indices from spatial, temporal, frequency, and structural domains were extracted from the body's center of pressure (COP) signals and its Rambling and Trembling components...
September 5, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28893202/preliminary-evaluation-of-prototype-footwear-and-insoles-to-optimise-balance-and-gait-in-older-people
#13
Hylton B Menz, Maria Auhl, Shannon E Munteanu
BACKGROUND: Footwear has the potential to influence balance in either a detrimental or beneficial manner, and is therefore an important consideration in relation to falls prevention. The objective of this study was to evaluate balance ability and gait patterns in older women while wearing prototype footwear and insoles designed to improve balance. METHODS: Older women (n = 30) aged 65 - 83 years (mean 74.4, SD 5.6) performed a series of laboratory tests of balance ability (postural sway on a foam rubber mat, limits of stability and tandem walking, measured with the Neurocom® Balance Master) and gait patterns (walking speed, cadence, step length and step width at preferred speed, measured with the GAITRite® walkway) while wearing (i) flexible footwear (Dunlop Volley™), (ii) their own footwear, and (iii) prototype footwear and insoles designed to improve dynamic balance...
September 11, 2017: BMC Geriatrics
https://www.readbyqxmd.com/read/28879179/capturing-the-cranio-caudal-signature-of-a-turn-with-inertial-measurement-systems-methods-parameters-robustness-and-reliability
#14
Karina Lebel, Hung Nguyen, Christian Duval, Réjean Plamondon, Patrick Boissy
BACKGROUND: Turning is a challenging mobility task requiring coordination and postural stability. Optimal turning involves a cranio-caudal sequence (i.e., the head initiates the motion, followed by the trunk and the pelvis), which has been shown to be altered in patients with neurodegenerative diseases, such as Parkinson's disease as well as in fallers and frails. Previous studies have suggested that the cranio-caudal sequence exhibits a specific signature corresponding to the adopted turn strategy...
2017: Frontiers in Bioengineering and Biotechnology
https://www.readbyqxmd.com/read/28878227/intermittent-muscle-activity-in-the-feedback-loop-of-postural-control-system-during-natural-quiet-standing
#15
Hiroko Tanabe, Keisuke Fujii, Motoki Kouzaki
The origin of continual body oscillation during quiet standing is a neural-muscular-skeletal closed feedback loop system that includes insufficient joint stiffness and a time delay. Thus, muscle activity and joint oscillations are nonlinear during quiet standing, making it difficult to demonstrate the muscular-skeletal relationship experimentally. Here we experimentally revealed this relationship using intermittent control theory, in which non-actuation works to stabilize the skeletal system towards equilibrium...
September 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28877185/feet-deformities-are-correlated-with-impaired-balance-and-postural-stability-in-seniors-over-75
#16
Ewa Puszczalowska-Lizis, Przemyslaw Bujas, Jaroslaw Omorczyk, Slawomir Jandzis, Marek Zak
OBJECTIVE: Understanding the factors and mechanisms that determine balance in seniors appears vital in terms of their self-reliance and overall safety. The study aimed to determine the relationship between the features of feet structure and the indicators of postural stability in the elderly. METHODS: The study group comprised 80 seniors (41F, 39M; aged 75-85 years). CQ-ST podoscope and the CQ-Stab 2P two-platform posturograph were used as primary research tools...
2017: PloS One
https://www.readbyqxmd.com/read/28870628/the-role-of-anterior-cruciate-ligament-in-the-control-of-posture-possible-neural-contribution
#17
Mohammadreza Nematollahi, Mohsen Razeghi, Behdad Tahayori, David Koceja
The anterior cruciate ligament (ACL) is not only a mechanical structure for knee joint stability but is also a source of sensory information which could be used in the control of standing posture. It has been shown that the center of pressure (COP) time series during normal standing may be decomposed into two components which are hypothetically governed by different neural mechanisms, namely rambling and trembling. The aim of the present study was to investigate to what extent an injury to the ACL structure would affect these two control mechanisms...
September 8, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28869638/evaluation-of-the-accuracy-of-the-postural-stability-measurement-with-the-y-balance-test-based-on-the-levels-of-the-biomechanical-parameters
#18
Robert Walaszek, Wiesław Chwała, Katarzyna Walaszek, Marcin Burdacki, Jarosław Błaszczuk
PURPOSE: The study of dynamic balance involves tests that assess the muscle control of spatial changes of the position of the centre of gravity over the base of support. The purpose of this work was to determine the structure of the Y-balance test and its accuracy based on the measurements of strength performance of the muscles acting on the knee joint as well as the flexibility and balance in boys aged 14 years. METHODS: The study included 43 schoolboys regularly participating in physical education lessons...
2017: Acta of Bioengineering and Biomechanics
https://www.readbyqxmd.com/read/28869628/the-influence-of-the-acoustic-stimulus-on-postural-stability
#19
Anna Majewska, Weronika Kawałkiewicz, Dorota Hojan-Jezierska, Agata Jezierska, Leszek Kubisz
PURPOSE: The purpose of this study was to assess if 65 dB and 4000 Hz stimuli affect postural stability of young normally hearing people. METHODS: Posturography examinations belong to clinical tests which evaluate the motor skills. Posturography can be divided into static posturography and dynamic posturography. In both static and dynamic posturography patient stays on the platform with opened and closed eyes, but in the case of dynamic one, platform is unstable...
2017: Acta of Bioengineering and Biomechanics
https://www.readbyqxmd.com/read/28869624/computerized-static-posturography-and-laterality-in-children-influence-of-age
#20
Sophie Bourelle, Nilanjan Dey, Dimitra Sifaki-Pistolla, Benoit Berge, Vincent Gautheron, Jerome Cottalorda, Redha Taiar
PURPOSE: The present study aims to explore relationships between footedness and posturographic assessment in children aged from 4 to 10. A real-time computerised device was used on a force plate for movement analysis. It requires a static posturography to assess postural control of children with the same handedness and footedness. METHODS: Thirty eight right-handed and right-footed children organized in three age groups of 4 to 6 years old, 6 to 8 years old and 8 to 10 years old participated in the study...
2017: Acta of Bioengineering and Biomechanics
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