Search Results
Results 201 - 250 of 883
< 1 2 3 4 5 6 7 8 9 10 >
Delahunt Eamonn - - 2010
OBJECTIVE: To investigate whether 2 different mechanisms of ankle joint taping ([1] lateral subtalar sling or [2] fibular repositioning) can enhance actual and perceived dynamic postural stability in participants with chronic ankle instability (CAI). DESIGN: Laboratory-based repeated-measures study. SETTING: University biomechanics laboratory. PARTICIPANTS: Participants (n=16) with CAI. INTERVENTIONS: Participants performed ...
Carpenter M G - - 2010
Humans and other species are unable to stand perfectly still; their bodies continuously sway during stance even during concentrated efforts to avoid such movement. Traditionally, this phenomenon has been viewed as an inability of the central nervous system (CNS) to maintain perfect equilibrium because of its reliance on feedback from ...
Kolar P - - 2010
The aim was to describe diaphragmatic behavior during postural limb activities and examine the ventilatory and stabilizing functions of the diaphragm. Thirty healthy subjects were examined in the supine position using a dynamic MRI system assessed simultaneously with specialized spirometric readings. The diaphragmatic excursions (DEs) were measured at three diaphragmatic ...
Brandman Talia - - 2010
Evidence suggesting that the brain has specialized mechanisms for processing human bodies include the discovery of body-selective brain areas and the behavioral body inversion effect (BIE). Interestingly, the BIE (worse discrimination of inverted vs upright bodies) disappears for headless bodies, implying a critical role of the head in this effect. ...
Preuss Richard A - - 2010
This study defines the limits of stability in sitting, and quantitatively assesses two measures of postural control relative to these limits. Young, healthy subjects sat, feet unsupported, on an elevated force plate. The limits of stability were determined by a least square fit of an ellipse to the center of ...
Thrasher T Adam - - 2010
Understanding how the human body responds to unexpected force perturbations during quiet sitting is important to the science of motor behavior and the design of neuroprostheses for sitting posture. In this study, the performance characteristics of the neck and trunk in healthy individuals were assessed by measuring the kinematic responses ...
Bortolami Simone B SB Ashton Graybiel Spatial Orientation Laboratory, MS 033, Brandeis University, P.O. Box 549110, Waltham, MA 02454-9110, - - 2010
To assess vestibular influences on recovery of balance during sudden falls, we measured the postural responses of five healthy subjects to a hold and release perturbation coupled with galvanic vestibular stimulation (GVS). Two electrode pairs were located with the anterior electrode of each pair over the mastoid process and the ...
Jeka John J - - 2010
Multisensory reweighting (MSR) is an adaptive process that prioritizes the visual, vestibular, and somatosensory inputs to provide the most reliable information for postural stability when environmental conditions change. This process is thought to degrade with increasing age and to be particularly deficient in fall-prone versus healthy older adults. In the ...
Wright W G WG Department of Physical Therapy, Temple University, Philadelphia, PA 19140, USA. - - 2010
Integration of sensory and motor inputs has been shown to be impaired in appendicular muscles and joints of Parkinson's disease (PD) patients. As PD advances, axial symptoms such as gait and balance impairments appear, which often progresses to complete inability stand or walk unaided. The current study evaluates kinesthesia in ...
Hoyle Jeffrey A - - 2011
Musculoskeletal complaint rates are high among those performing low-level static exertions (LLSEs), such as computer users. However, our understanding of the causal mechanisms is lacking. It was hypothesized that myofascial trigger point (MTrP) development might be one causal mechanism to help explain these complaints and that static postural and visual ...
Bieć Ewa - - 2010
To evaluate the effect of early systematic soccer training on postural control we measured center-of-pressure (COP) variability, range, mean velocity and frequency in bipedal quiet stance with eyes open (EO) and closed (EC) in 44 boys aged 13 (25 boys who practiced soccer for 5-6 years and 19 healthy boys ...
Bertaccini Edward J EJ Department of Anesthesia, Stanford University School of Medicine and Beckman Center for Molecular and Genetic Medicine, Stanford, California, - - 2010
We have previously used molecular modeling and normal-mode analyses combined with experimental data to visualize a plausible model of a transmembrane ligand-gated ion channel. We also postulated how the gating motion of the channel may be affected by the presence of various ligands, especially anesthetics. As is typical for normal-mode ...
Guigon Emmanuel - - 2010
Posture and movement are fundamental, intermixed components of motor coordination. Current approaches consider either that 1) movement is an active, anticipatory process and posture is a passive feedback process or 2) movement and posture result from a common passive process. In both cases, the presence of a passive component renders ...
Isableu B B University Joseph Fourier, TIMC-IMAG Laboratory, UMR CNRS 5525, Grenoble F-38706, France. - - 2010
The causes of the interindividual differences (IDs) in how we perceive and control spatial orientation are poorly understood. Here, we propose that IDs partly reflect preferred modes of spatial referencing and that these preferences or "styles" are maintained from the level of spatial perception to that of motor control. Two ...
Kociolek Aaron M - - 2010
The aim of this study was to determine the effects of video playback speed on posture matching reliability of the distal upper extremity. Video is frequently used in ergonomic assessments, yet there remains a need to determine the effects of viewing speed on posture observations. Participants were 7 graduate students ...
Yovel Galit - - 2010
It has been recently argued that human bodies are processed by a specialized processing mechanism. Central evidence was that body inversion reduces recognition abilities (body inversion effect; BIE) as much as it does for faces, but more than for other objects. Here we showed that the BIE is markedly reduced ...
Horton Stuart J - - 2010
A repeated measures observational study. To investigate change in sagittal alignment of head and neck posture in response to adjustments of an office chair with and without a lumbar roll in situ. Forward head posture has been identified as a risk factor for neck pain, and there is evidence to ...
Dewi Dyah Ekashanti Octorina - - 2010
Unreliable spinal X-ray radiography measurement due to standing postural variability can be minimized by using positional supports. In this study, we introduce a balancing device, named BalancAid, to position the patients in a reproducible position during spinal X-ray radiography. This study aimed to investigate the performance of healthy young subjects' ...
Godfrey Alan - - 2010
The usefulness of motor subtypes of delirium is unclear due to inconsistency in sub-typing methods and a lack of validation with objective measures of activity. The activity of 40 patients was measured with 24 h accelerometry monitoring. Patients with Diagnostic and Statistical Manual of Mental Disorders, fourth edition (DSM-IV) delirium ...
Yiou E - - 2010
During voluntary stepping initiation, postural stability along the mediolateral direction is controlled via "anticipatory postural adjustment" (APA). This study tested the hypothesis that, in young healthy subjects, the biomechanical features of mediolateral APA depend on the leg that initiates stepping. Subjects (N=10) initiated a rapid single step with the preferred ...
Goodworth Adam D - - 2010
The influence of stance width on frontal plane postural dynamics and coordination in human bipedal stance was studied. We tested the hypothesis that when subjects adopt a narrow stance width, they will rely heavily on nonlinear control strategies and coordinated counter-phase upper and lower body motion to limit center-of-mass (CoM) ...
Brault Sébastien - - 2010
Suddenly changing direction requires a whole body reorientation strategy. In sporting duels such as an attacker vs. a defender in rugby, successful body orientation/reorientation strategies are essential for successful performance. The aim of this study is to examine which biomechanical factors, while taking into account biomechanical constraints, are used by ...
Schilling Robert J RJ Department of Electrical and Computer Engineering, Clarkson University, Potsdam, NY 13699, USA. - - 2010
A phase-locked loop (PLL) model of the response of the postural control system to periodic platform motion is proposed. The PLL model is based on the hypothesis that quiet standing (QS) postural sway can be characterized as a weak sinusoidal oscillation corrupted with noise. Because the signal to noise ratio ...
Tsutsumi Takeshi - - 2010
CONCLUSION: When combined with vestibular dysfunction, visual flow can exacerbate reductions in postural stability. This effect may be one of the mechanisms underlying visual vertigo, which can be evaluated using frequency analysis of body sway elicited by optokinetic stimulation (OKS). OBJECTIVE: To clarify the interaction between the postural responses to ...
Wang Yun Y Department of Infant Education, Iwakuni Junior College, Ohtsu-Cho 2-24-18, Iwakuni 740-0032, Japan. - - 2010
In this study, we have explored whether the impact of visual information on postural reactions is due to the same perceptual mechanisms that produce vection. Pitch motion of the visual field was presented at varying velocities to eight healthy subjects (29.9+/-2.8 years) standing quietly on a stationary base of support ...
Rougier Patrice R - - 2010
Past studies have emphasized the beneficial effect of additional visual feedback (VFB) on the capacity of healthy adults to decrease the amplitudes of the center-of-pressure minus center-of-gravity (CP-CG(v)) movements. To better assess these capacities, 56 subjects were asked to stand still on a force platform and to use the visual ...
Patel Biren A - - 2010
The primate fossil record suggests that terrestriality was more common in the past than it is today, particularly among cercopithecoid primates. Whether or not a fossil primate habitually preferred terrestrial substrates has typically been inferred from its forelimb anatomy. Because extant large-bodied terrestrial cercopithecine monkeys utilize digitigrade hand postures during ...
Armstrong W Jeffrey - - 2010
Reliability of high-resolution accelerometery (HRA) and mechanomyography (MMG) was evaluated for the assessment of single-leg balance. Subjects (5M/5F, 25+/-3 yr; 169.4+/-11.7 cm; 79.0+/-16.9 kg) participated in fifteen (three randomized bouts of five repetitions) 15-s dominant leg stances. A single HRA was fixed superficial to L3/L4 segment to capture motions relative ...
Zampagni M L - - 2010
Here, we studied posture and movement coordination adopted by expert climbers. The investigation of such expertise might be of particular interest to gain understanding about the mechanisms underlying the biomechanical control of vertical quadrupedal locomotion. A novel custom setup was developed to analyze the motion of the center-of-mass (COM) and ...
Caudron Sébastien S Laboratoire de Psychologie et NeuroCognition, UMR 5105 CNRS, Université Pierre Mendès France, BP47, 38040, Grenoble Cedex 9, France. - - 2010
The described experiment investigated whether adaptation to successive Achilles tendon vibration depends on the postural challenge. In phase 1, thirty-six participants were divided into three groups, each with a different postural challenge. After being blindfolded, participants received 15 trials of Achilles tendon vibration (10 s-90 Hz) while standing upright in ...
Santos Marcio J MJ Department of Physical Therapy, University of Illinois at Chicago, IL 60612, - - 2010
The central nervous system (CNS) utilizes anticipatory (APAs) and compensatory (CPAs) postural adjustments to maintain equilibrium while standing. It is known that these postural adjustments involve displacements of the center of mass (COM) and center of pressure (COP). The purpose of the study was to investigate the relationship between APAs ...
Sung Paul S - - 2010
Musculoskeletal evaluation skills are needed to examine postural compensation techniques, but little is known about ground reaction forces (GRF) in standing posture. Even though a number of studies have evaluated GRF in patients with low back pain (LBP) during vertical perturbations, it would be important to consider compensation characteristics which ...
Patel Biren A - - 2010
Nonprimate terrestrial mammals may use digitigrade postures to help moderate distal limb joint moments and metapodial stresses that may arise during high-speed locomotion with high-ground reaction forces (GRF). This study evaluates the relationships between speed, GRFs, and distal forelimb kinematics in order to evaluate if primates also adopt digitigrade hand ...
Gadotti Inae Caroline - - 2010
RATIONALE, AIMS AND OBJECTIVES: Historically, clinicians visually evaluate posture using anatomical landmarks. Advances in technology made digital photographs now feasible to use in clinical practice. Photogrammetry may increase the reliability of the assessment of postural changes. However, differences between visually estimated and photogrammetric recorded changes in posture need to be ...
Dokka Kalpana - - 2010
To stabilize our position in space we use visual information as well as non-visual physical motion cues. However, visual cues can be ambiguous: visually perceived motion may be caused by self-movement, movement of the environment, or both. The nervous system must combine the ambiguous visual cues with noisy physical motion ...
Tjernström Fredrik F Department of Otorhinolaryngology, Head and Neck Surgery, Clinical Sciences, Lund University, Lund, Sweden. - - 2010
We investigated the possible consequences of two consecutive postural tasks on adaptation. Four groups (total number of 46 healthy subjects) were perturbed on two consecutive days with vibration stimulus to tibialis anterior or posterior calf muscles, or both in different orders. Postural movements were recorded with a force platform. There ...
Myers Thomas - - 2010
The group of myofascial units known as the deep lateral rotators are considered in light of their role as postural hip extensors, resulting functional and palpatory assessments of pelvic neutral are presented, and treatment strategies for anterior and posterior pelvic tilt are discussed.
Braccini Stephanie - - 2010
The degree to which non-human primate behavior is lateralized, at either individual or population levels, remains controversial. We investigated the relationship between hand preference and posture during tool use in chimpanzees (Pan troglodytes) during bipedal tool use. We experimentally induced tool use in a supported bipedal posture, an unsupported bipedal ...
Lee Linda-Joy - - 2010
This study examined the effect of sitting posture on regional chest wall shape in three dimensions, chest wall motion (measured with electromagnetic motion analysis system), and relative contributions of the ribcage and abdomen to tidal volume (%RC/V(t)) (measured with inductance plethysmography) in 7 healthy volunteers. In seven seated postures, increased ...
Vinjamuri Ramana - - 2010
Postural synergies of the hand have been widely proposed in the literature, but only a few attempts were made to visualize temporal postural synergies, i.e., profiles of postural synergies varying over time. This paper aims to derive temporal postural synergies from kinematic synergies extracted from joint angular velocity profiles of ...
Ugbolue U Chris - - 2010
To compare two postural interventions, a wrist splint and a Wrist Alignment Device (WAD) with a biofeedback mechanism. Nine right-handed healthy individuals participated in the study. Using both hands independently a 30-minute office-activity-experiment was performed that consisted of data entry, mouse clicking, text dragging, and mouse scrolling executed one after ...
Raffler Nastaran - - 2010
The drivers of ten vehicles (tram, helicopter, saloon car, van, forklift, two mobile excavators, wheel loader, tractor, elevating platform truck) were studied with regard to the combined exposures of whole-body vibration and awkward posture during occupational tasks. Seven degrees of freedom (DOFs), or body angles, were recorded as a function ...
Horak Fay B FB Department of Neurology and Biomechanical Engineering, Oregon Health and Science University, 3181 SW Sam Jackson Park Road OP32, Portland, OR 97239, USA. - - 2010
This chapter summarizes the role of the vestibular system in postural control so that specific and effective rehabilitation can be designed that facilitates compensation for loss of vestibular function. Patients with bilateral or unilateral loss of peripheral vestibular function are exposed to surface perturbations to quantify automatic postural responses. Studies ...
Wall C C - - 2010
Vibrotactile tilt feedback was used to help vestibulopathic subjects control their anterioposterior (AP) sway during sensory organization tests 5 and 6 of Equitest computerized dynamic posturography. We used four kinds of signals to activate the feedback. The first signal was proportional (P) to the measured tilt of the subject, while ...
Kellerová E - - 2010
There is virtually no information on spontaneous variability of ECG body surface potential maps (BSPMs) and on dynamics of their reactive changes in healthy subjects. This study evaluated quantitatively the depolarization (QRS) and repolarization (QRST) parameters derived from the respective integral BSPMs, constructed beat-to-beat, from continual body surface ECG records ...
Rigoberto Martinez M MM Chiba university, 263-8500, Japan. - - 2010
We present a study on using a smart phone as a tool to evaluate anticipatory postural adjustments (APA) before the beginning of normal gait in healthy subjects. The results show a significantly lower amplitude of anticipatory postural adjustments in the mediolateral axis (ML) when subjects used the non-dominant leg for ...
Asundi Krishna - - 2010
This study quantified postures of users working on a notebook computer situated in their lap and tested the effect of using a device designed to increase the height of the notebook when placed on the lap. A motion analysis system measured head, neck and upper extremity postures of 15 adults ...
Lancioni Giulio - - 2010
OBJECTIVE: To evaluate a technology-based programme to help a post-coma man with multiple disabilities access stimulation and control head posture (i.e. reduce head forward tilting). METHOD: The response targeted within the programme was closing the sweater's zipper. This response (which could be repeated since the zipper tended to reopen automatically) ...
Viel Sébastien - - 2010
In order to test how gravitational information would affect the choice of stable reference frame used to control posture and voluntary movement, we have analysed the forearm stabilisation during sit to stand movement under microgravity condition obtained during parabolic flights. In this study, we hypothesised that in response to the ...
Bruns Patrick - - 2010
It is well known that spatial discrepancies between synchronized auditory and visual events can lead to mislocalizations of the auditory stimulus toward the visual stimulus, the so-called ventriloquism effect. Recently, a similar effect of touch on audition has been reported. This study investigated whether this audio-tactile ventriloquism effect depends on ...
< 1 2 3 4 5 6 7 8 9 10 >