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posterior center of pressure

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https://www.readbyqxmd.com/read/29328985/standing-on-a-sliding-board-affects-generation-of-anticipatory-and-compensatory-postural-adjustments
#1
Bing Chen, Yun-Ju Lee, Alexander S Aruin
Postural control is compromised in the presence of body instability. We studied anticipatory and compensatory postural adjustments people use to maintain balance while standing on an unstable surface and performing voluntary arm movements. Nine healthy participants stood on a sliding board (that was either locked and as such motionless or unlocked and as such free to move in the anterior-posterior direction) and performed fast bilateral arms flexion. Arm acceleration, bilateral electromyographic activity (EMG) of the trunk and lower extremity muscles and center of pressure (COP) displacements were recorded and analyzed within the intervals typical for the anticipatory (APAs) and compensatory (CPAs) postural adjustments...
December 28, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/29326906/a-comparison-of-ground-reaction-force-components-according-to-the-foothold-heights-in-16-t-truck-during-downward-step
#2
Seung-Hyun Hyun, Che-Cheong Ryew
The aim of this study is to compare and analyze the components of ground reaction force (GRF) relative to the foothold heights during downward step of 16-t truck. Adult males (n= 10) jumped downward from each 1st, 2nd, 3rd foothold step and driver's seat orderly using hand rail. Sampling rate of force components of 3 axis (medial-lateral [ML] GRF, anterior-posterior [AP] GRF, peak vertical force [PVF]), variables (COPx, COPy, COP area) of center of pressure (COP), loading rate, and stability index (ML, AP, vertical, and dynamic postural stability index [DPSI]) processed from GRF system was cut off at 1,000 Hz...
December 2017: Journal of Exercise Rehabilitation
https://www.readbyqxmd.com/read/29323932/the-effects-of-breath-alcohol-concentration-on-postural-control
#3
Dary D Fiorentino
STRUCTURED ABSTRACT Background: Two of the three standardized field sobriety tests that US law enforcement uses at roadside checks have a postural equilibrium component to them. Those tests have been validated to detect impairment caused by blood alcohol concentrations (BACs) of .08 g/dL or above. Many medical and traffic safety associations support a lower limit, and one state, Utah, has passed a law to lower the limit to .05 g/dL. Many studies have examined the effects of alcohol on postural control (of which postural equilibrium is a component), with a consensus emerging that impairment is usually found at BACs greater than ...
January 11, 2018: Traffic Injury Prevention
https://www.readbyqxmd.com/read/29305618/control-of-vertical-posture-while-standing-on-a-sliding-board-and-pushing-an-object
#4
Yun-Ju Lee, Bing Chen, Jing-Nong Liang, Alexander S Aruin
Voluntary pushing or translation perturbation of the support surface each induces a body perturbation that affects postural control. The objective of the study was to investigate anticipatory (APA) and compensatory (CPA) postural adjustments when pushing an object (that induces self-initiated perturbation) and standing on a sliding board (that induces translational perturbation). Thirteen healthy young participants were instructed to push a handle with both hands while standing on a sliding board that was either free to move in the anterior-posterior direction or stationary...
January 5, 2018: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/29304163/a-successful-backward-step-correlates-with-hip-flexion-moment-of-supporting-limb-in-elderly-people
#5
Yahiko Takeuchi
PURPOSE: The objective of this study was to determine the positional relationship between the center of mass (COM) and the center of pressure (COP) at the time of step landing, and to examine their relationship with the joint moments exerted by the supporting limb, with regard to factors of the successful backward step response. METHODS: The study population comprised 8 community-dwelling elderly people that were observed to take successive multi steps after the landing of a backward stepping...
2018: PloS One
https://www.readbyqxmd.com/read/29286981/age-related-changes-in-postural-control-in-physically-inactive-older-women
#6
Juliana Teles Tavares, Daniela Aparecida Biasotto-Gonzalez, Nárlon Cássio Boa Sorte Silva, Frank Shiguemitsu Suzuki, Paulo Roberto Garcia Lucareli, Fabiano Politti
BACKGROUND AND PURPOSE: The maintenance of postural control is influenced by the complexity of a given task. Tasks that require greater attention and cognitive involvement increase the risk of falls among older adults. The aim of the present study was to evaluate the adaptation of the postural control system to different levels of task complexity in physically inactive young and older women. METHODS: A cross-sectional study was conducted with adult women classified as physically inactive based on the results of the International Physical Activity Questionnaire...
December 28, 2017: Journal of Geriatric Physical Therapy
https://www.readbyqxmd.com/read/29279639/posterior-reversible-leukoencephalopathy-syndrome-pres-in-intensive-care-unit-case-series
#7
Antara Gokhale, Atheel Kimona, Sandeep Kantor, S Prakash, Yogesh Manhas
Introduction: Posterior reversible encephalopathy syndrome (PRES) is characterized by a range of clinico neuro radiological manifestation along with hypertension due to varied etiology. Contrary to its name, a small number of patients have residual neurological deficits. Patients with severe manifestation of PRES may get admitted to the Intensive Care Unit (ICU) due to coma or status epilepticus. Small case series and large multicenter studies have been reported. Materials and Methods: We report a single center series of ten cases admitted to ICU over a 5 year period in a tertiary care centre...
November 2017: Indian Journal of Critical Care Medicine
https://www.readbyqxmd.com/read/29248190/thigh-calf-contact-parameters-for-six-high-knee-flexion-postures-onset-maximum-angle-total-force-contact-area-and-center-of-force
#8
David C Kingston, Stacey M Acker
In high knee flexion, contact between the posterior thigh and calf is expected to decrease forces on tibiofemoral contact surfaces, therefore, thigh-calf contact needs to be thoroughly characterized to model its effect. This study measured knee angles and intersegmental contact parameters in fifty-eight young healthy participants for six common high flexion postures using motion tracking and a pressure sensor attached to the right thigh. Additionally, we introduced and assessed the reliability of a method for reducing noise in pressure sensor output...
November 28, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/29246154/dexamethasone-implants-in-paediatric-patients-with-noninfectious-intermediate-or-posterior-uveitis-first-prospective-exploratory-case-series
#9
Sibylle Winterhalter, Uwe Diedrich Behrens, Daniel Salchow, Antonia M Joussen, Uwe Pleyer
BACKGROUND: To evaluate the efficacy and safety of dexamethasone (DEX) implants in paediatric patients with noninfectious intermediate or posterior uveitis. METHODS: Prospective single center exploratory case series. Children and adolescents, 6 to 17 years old, with a vitreous haze score of ≥1.5+ or cystoid macular edema (CME) of >300 μm were enrolled. Vitreous haze score at month 2 was chosen as primary endpoint. Best corrected visual acuity (BCVA), central retinal thickness (CRT) and concomitant medication at month 6 were defined as secondary endpoints...
December 16, 2017: BMC Ophthalmology
https://www.readbyqxmd.com/read/29239806/development-of-postural-control-and-maturation-of-sensory-systems-in-children-of-different-ages-a-cross-sectional-study
#10
Cristina Dos Santos Cardoso de Sá, Catarina Costa Boffino, Renato Teodoro Ramos, Clarice Tanaka
OBJECTIVE: To evaluate the stability, postural adjustments and contributions of sensory information for postural control in children. METHODS: 40 boys and 40 girls were equally divided into groups of 5, 7, 9 and 12 years (G5, G7, G9 and G12). All children were submitted to dynamic posturography using a modified sensory organization test, using four sensory conditions: combining stable or sway referencing platform with eyes opened, or closed. The area and displacements of the center of pressure were used to determine stability, while the adjustments were used to measure the speed of the center of pressure displacements...
November 8, 2017: Brazilian Journal of Physical Therapy
https://www.readbyqxmd.com/read/29209250/mental-simulation-of-painful-situations-has-an-impact-on-posture-and-psychophysiological-parameters
#11
Thierry Lelard, Olivier Godefroy, Said Ahmaidi, Pierre Krystkowiak, Harold Mouras
Embodiment is made possible by the ability to imagine ourselves in a particular situation (mental simulation). Postural changes have been demonstrated in response to painful situations, but the effect of an implicit instruction has not been studied. The present study was designed to record differential responses according to whether or not subjects were instructed to imagine themselves in a painful or non-painful situation. Painful stimuli and instructions to mentally simulate the displayed situation were hypothesized to induce postural changes that could be demonstrated by changes in the center of pressure (COP) trajectory compared to viewing the same stimuli with no instructions...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/29202358/increasing-mediolateral-standing-sway-is-associated-with-increasing-corticospinal-excitability-and-decreasing-m1-inhibition-and-facilitation
#12
Tulika Nandi, Beth E Fisher, Tibor Hortobágyi, George J Salem
In standing, corticospinal excitability increases and primary motor cortex (M1) inhibition decreases in response to anterior posterior or direction unspecific manipulations that increase task difficulty. However, mediolateral (ML) sway control requires greater active neural involvement. Therefore, the primary purpose of this study was to determine the pattern of change in neural excitability when ML postural task difficulty is manipulated and to test whether the neural excitability is proportional to ML sway magnitude across conditions...
November 28, 2017: Gait & Posture
https://www.readbyqxmd.com/read/29188450/ankle-muscle-activity-modulation-during-single-leg-stance-differs-between-children-young-adults-and-seniors
#13
Eduard Kurz, Oliver Faude, Ralf Roth, Lukas Zahner, Lars Donath
PURPOSE: Incomplete maturation and aging-induced declines of the neuromuscular system affect postural control both in children and older adults and lead to high fall rates. Age-specific comparisons of the modulation of ankle muscle activation and behavioral center of pressure (COP) indices during upright stance have been rarely conducted. The objective of the present study was to quantify aging effects on a neuromuscular level. Thus, surface electromyography (SEMG) modulation and co-activity of ankle muscles during single-leg standing was compared in healthy children, young adults and seniors...
November 29, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/29173778/assessing-the-long-term-manometric-outcomes-in-patients-with-previous-laparoscopic-anorectoplasty-larp-and-posterior-sagittal-anorectoplasty-psarp
#14
Patrick Ho Yu Chung, Carol Wing Yan Wong, Kenneth Kak Yuen Wong, Paul Kwong Hang Tam
BACKGROUND/PURPOSE: The objective of this study is to compare the long term manometric outcomes in patients with previous laparoscopic anorectoplasty (LARP) and posterior sagittal anorectoplasty (PSARP). METHODS: This is a single-centered retrospective study and the participants were born with various types of anorectal malformation. Manometric assessment was carried out with high-resolution anorectomanometry performed as a day procedure. In addition, a seven-itemed bowel function score (BFS) was utilized to assess the functional outcomes...
November 22, 2017: Journal of Pediatric Surgery
https://www.readbyqxmd.com/read/29145576/different-filling-patterns-of-the-choriocapillaris-in-fluorescein-and-indocyanine-green-angiography-in-primate-eyes-under-elevated-intraocular-pressure
#15
Naoto Hanyuda, Hideo Akiyama, Yukitoshi Shimoda, Ryo Mukai, Morihiko Sano, Yoichiro Shinohara, Shoji Kishi
Purpose: To investigate the hemodynamics of the choriocapillaris in primate eyes under elevated intraocular pressure. Methods: Indocyanine green angiography (ICGA) and fluorescein angiography (FA) were performed in two monkeys after elevation of the intraocular pressure (IOP) to 35 and 60 mm Hg. Results: ICGA and FA showed no perfusion delays in the choriocapillaris at 35 mm Hg. The slow dye filling at 60 mm Hg made it possible to observe the early phase angiography sequence...
November 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/29141386/-clinical-characteristics-and-surgical-effect-observation-of-congenital-aniridia-combined-with-cataract
#16
X H Wu, Q Z Cao, Y X Hu, J N Lin, H T Lin, W R Chen, Y Z Liu
Objective: To analyze the clinical manifestations, surgical approaches and postoperative prognosis for the cases of congenital aniridia combined with cataract. Methods: In this retrospective case series, 26 patients diagnosed with congenital aniridia combined with cataract were collected from Zhongshan Ophthalmic Center from February 2002 to August 2016. The Clinical data were collected to analyze the clinical features, surgical approaches and postoperative prognosis. T-test was used for statistical analysis...
November 11, 2017: [Zhonghua Yan Ke za Zhi] Chinese Journal of Ophthalmology
https://www.readbyqxmd.com/read/29120261/effects-of-vision-and-cognitive-load-on-static-postural-control-in-subjects-with-and-without-patellofemoral-pain-syndrome
#17
Afsaneh Zeinalzadeh, Saeed Talebian, Soofia Naghdi, Mahyar Salavati, Salman Nazary-Moghadam, Bahareh Zeynalzadeh Ghoochani
OBJECTIVE: To compare the effects of vision and cognitive load on static postural control in subjects with and without patellofemoral pain syndrome (PFPS). METHODS: Twenty-eight PFPS patients and 28 controls participated in the study. Postural control was assessed in isolation as well as with visual manipulation and cognitive loading on symptomatic limb. The outcome measures of postural control were quantified in terms of area, anterior-posterior (AP), medial-lateral (ML), and mean velocity (MV) of the displacements of center of pressure (COP)...
November 9, 2017: Physiotherapy Theory and Practice
https://www.readbyqxmd.com/read/29093770/associates-and-prognosis-of-giant-left-atrium-single-center-experience
#18
Hyoeun Kim, Young-Ah Park, Sung Min Choi, Hyemoon Chung, Jong-Youn Kim, Pil-Ki Min, Young Won Yoon, Byoung Kwon Lee, Bum-Kee Hong, Se-Joong Rim, Hyuck Moon Kwon, Eui-Young Choi
Background: Left atrial (LA) remodeling develops as a result of longstanding pressure overload. However, determinants and clinical outcome of excessive remodeling, so called giant left atrium (GLA), are not clear. Methods: Clinical characteristics of patients with GLA (antero-posterior diameter higher than 65 mm), including echo-Doppler parameters, and follow-up clinical outcomes from a tertiary referral hospital were investigated. Results: Among 68519 consecutive primary patients who underwent echocardiography over a period of 10 years, data from 163 GLA cases (0...
September 2017: Journal of Cardiovascular Ultrasound
https://www.readbyqxmd.com/read/29079459/effect-of-noisy-galvanic-vestibular-stimulation-on-center-of-pressure-sway-of-static-standing-posture
#19
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/29072015/-clinical-trials-for-thyroidectomy-under-acupuncture-aided-anesthesia-by-using-electroacupuncture-or-transcutaneous-acupoint-electrical-stimulation-of-different-acupoints
#20
Yin-Qiu Gao, Qing Jia, Shen Xie, Li-Wei Yin, Ji-Xiu Xue, Li-Hua Kou, Bing Xue, Jun-Ling Liu, Jin-Hua Shi
OBJECTIVE: To observe the effectiveness of transcutaneous acupoint electrical stimulation (TAES) or electroacupuncture (EA) stimulation of different acupoints in combination with anesthetics in the management of thyroidectomy patients, so as to choose a better stimulating method and most effective acupoints for thyroidectomy. METHODS: A total of 216 thyroidectomy patients (ASA Ⅰ-Ⅱ grades) with thyroid gland adenoma, thyroid cyst or thyroid nodules from 3 hospitals (3 research centers) were randomized into 6 groups, i...
August 25, 2017: Zhen Ci Yan Jiu, Acupuncture Research
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