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Motion Capture

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https://www.readbyqxmd.com/read/29331720/temporal-spatial-gait-parameter-models-of-very-slow-walking
#1
Andrew J J Smith, Edward D Lemaire
This study assessed the relationship between walking speed and common temporal-spatial stride-parameters to determine if a change in gait strategy occurs at extremely slow walking speeds. Stride-parameter models that represent slow walking can act as a reference for lower extremity exoskeleton and powered orthosis controls since these devices typically operate at walking speeds less than 0.4 m/s. Full-body motion capture data were collected from 30 health adults while walking on a self-paced treadmill, within a CAREN-Extended virtual reality environment...
January 6, 2018: Gait & Posture
https://www.readbyqxmd.com/read/29331124/characterizing-protein-conformations-by-correlation-analysis-of-coarse-grained-contact-matrices
#2
Richard J Lindsay, Jan Siess, David P Lohry, Trevor S McGee, Jordan S Ritchie, Quentin R Johnson, Tongye Shen
We have developed a method to capture the essential conformational dynamics of folded biopolymers using statistical analysis of coarse-grained segment-segment contacts. Previously, the residue-residue contact analysis of simulation trajectories was successfully applied to the detection of conformational switching motions in biomolecular complexes. However, the application to large protein systems (larger than 1000 amino acid residues) is challenging using the description of residue contacts. Also, the residue-based method cannot be used to compare proteins with different sequences...
January 14, 2018: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29331112/effects-of-dispersion-interactions-on-the-structure-polarity-and-dynamics-of-liquid-vapor-interface-of-an-aqueous-nacl-solution-results-of-first-principles-simulations-at-room-temperature
#3
Jyoti Roy Choudhuri, Amalendu Chandra
The effects of dispersion interaction on the structure, polarity, and dynamics of liquid-vapor interface of a concentrated (5.3M) aqueous NaCl solution have been investigated through first-principles simulations. Among the structural properties, we have investigated the inhomogeneous density profiles of molecules, hydrogen bond distributions, and orientational profiles. On the dynamical side, we have calculated diffusion, orientational relaxation, hydrogen bond dynamics, and vibrational spectral diffusion of molecules...
January 14, 2018: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29330951/dynamic-musculoskeletal-functional-morphology-integrating-dicect-and-xromm
#4
Courtney P Orsbon, Nicholas J Gidmark, Callum F Ross
The tradeoff between force and velocity in skeletal muscle is a fundamental constraint on vertebrate musculoskeletal design (form:function relationships). Understanding how and why different lineages address this biomechanical problem is an important goal of vertebrate musculoskeletal functional morphology. Our ability to answer questions about the different solutions to this tradeoff has been significantly improved by recent advances in techniques for quantifying musculoskeletal morphology and movement. Herein, we have three objectives: (1) review the morphological and physiological parameters that affect muscle function and how these parameters interact; (2) discuss the necessity of integrating morphological and physiological lines of evidence to understand muscle function and the new, high resolution imaging technologies that do so; and (3) present a method that integrates high spatiotemporal resolution motion capture (XROMM, including its corollary fluoromicrometry), high resolution soft tissue imaging (diceCT), and electromyography to study musculoskeletal dynamics in vivo...
February 2018: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/29328181/super-resolution-image-de-fencing-using-a-nonlocal-nonconvex-prior
#5
Sankaraganesh Jonna, Sukla Satapathy, Rajiv R Sahay
Today's smartphones/phablets/tablets are equipped with cameras that have enabled people to capture their favorite moments. However, images or videos taken at public places using inexpensive low-resolution cameras are often degraded by the presence of occlusions such as fences/barricades. In order to reconstruct a fence-free high-resolution image, we use a video of a scene captured by panning a hand-held camera and model the effects of various degradations. Initially, we obtain the spatial locations of fences by semantic segmentation and subsequently estimate the subpixel motion between the degraded low-resolution frames...
January 10, 2018: Applied Optics
https://www.readbyqxmd.com/read/29328140/full-color-digitized-holography-for-large-scale-holographic-3d-imaging-of-physical-and-nonphysical-objects
#6
Kyoji Matsushima, Noriaki Sonobe
Digitized holography techniques are used to reconstruct three-dimensional (3D) images of physical objects using large-scale computer-generated holograms (CGHs). The object field is captured at three wavelengths over a wide area at high densities. Synthetic aperture techniques using single sensors are used for image capture in phase-shifting digital holography. The captured object field is incorporated into a virtual 3D scene that includes nonphysical objects, e.g., polygon-meshed CG models. The synthetic object field is optically reconstructed as a large-scale full-color CGH using red-green-blue color filters...
January 1, 2018: Applied Optics
https://www.readbyqxmd.com/read/29328067/a-physical-approach-to-model-occlusions-in-the-retinal-microvasculature
#7
O Fleck, T Savin
Blood occlusions in the retinal microvasculature contribute to the pathology of many disease states within the eye. These events can cause haemorrhaging and retinal detachment, leading to a loss of vision in the affected patient. Here, we present a physical approach to characterising the collective cell dynamics leading to plug formation, through the use of a bespoke microfluidic device, and through the derivation of a probabilistic model. Our microfluidic device is based on a filtration design that can tune the particle volume fraction of a flowing suspension within a conduit, with sizes similar to arterioles...
January 12, 2018: Eye
https://www.readbyqxmd.com/read/29328048/a-biomechanical-modeling-guided-simultaneous-motion-estimation-and-image-reconstruction-technique-smeir-bio-for-4d-cbct-reconstruction
#8
Xiaokun Huang, You Zhang, Jing Wang
Reconstructing four-dimensional cone-beam computed tomography (4D-CBCT) images directly from respiratory phase-sorted traditional 3D-CBCT projections can capture target motion trajectory, reduce motion artifacts, and reduce imaging dose and time. However, the limited numbers of projections in each phase after phase-sorting decreases CBCT image quality under traditional reconstruction techniques. To address this problem, we developed a simultaneous motion estimation and image reconstruction (SMEIR) algorithm, an iterative method that can reconstruct higher quality 4D-CBCT images from limited projections using an inter-phase intensity-driven motion model...
January 12, 2018: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29327823/a-previous-hamstring-injury-affects-kicking-mechanics-in-soccer-players
#9
Archit Navandar, Santiago Veiga, Gonzalo Torres, David Chorro, Enrique Navarro
BACKGROUND: Although the kicking skill is influenced by limb dominance and sex, how a previous hamstring injury affects kicking has not been studied in detail. Thus, the objective of this study was to evaluate the effect of sex and limb dominance on kicking in limbs with and without a previous hamstring injury. METHODS: 45 professional players (males: n=19, previously injured players=4, age=21.16 ± 2.00 years; females: n=19, previously injured players=10, age=22...
January 10, 2018: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/29327655/accuracy-between-optical-and-inertial-motion-capture-systems-for-assessing-trunk-speed-during-preferred-gait-and-transition-periods
#10
Martin Kokholm Fleron, Niels Christian Hauerbach Ubbesen, Francesco Battistella, David Leandro Dejtiar, Anderson Souza Oliveira
Motion capture through inertial sensors is becoming popular, but its accuracy to describe kinematics during changes in walking speed is unknown. The aim of this study was to determine the accuracy of trunk speed extracted using an inertial motion system compared to a gold standard optical motion system, during steady walking and stationary periods. Eleven participants walked on pre-established paths marked on the floor. Between each lap, a 1-second stationary transition period at the initial position was included prior to the next lap...
January 12, 2018: Sports Biomechanics
https://www.readbyqxmd.com/read/29325901/dynamic-structure-of-lower-limb-joint-angles-during-walking-post-stroke
#11
Kelley Kempski, Louis N Awad, Thomas S Buchanan, Jill S Higginson, Brian A Knarr
BACKGROUND: Variability in joint kinematics is necessary for adaptability and response to everyday perturbations; however, intrinsic neuromotor changes secondary to stroke often cause abnormal movement patterns. How these abnormal movement patterns relate to joint kinematic variability and its influence on post-stroke walking impairments is not well understood. OBJECTIVE: The purpose of this study was to evaluate the movement variability at the individual joint level in the paretic and non-paretic limbs of individuals post-stroke...
December 15, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/29320463/a-continuous-identity-authentication-scheme-based-on-physiological-and-behavioral-characteristics
#12
Guannan Wu, Jian Wang, Yongrong Zhang, Shuai Jiang
Wearable devices have flourished over the past ten years providing great advantages to people and, recently, they have also been used for identity authentication. Most of the authentication methods adopt a one-time authentication manner which cannot provide continuous certification. To address this issue, we present a two-step authentication method based on an own-built fingertip sensor device which can capture motion data (e.g., acceleration and angular velocity) and physiological data (e.g., a photoplethysmography (PPG) signal) simultaneously...
January 10, 2018: Sensors
https://www.readbyqxmd.com/read/29318996/a-case-report-of-real-time-in-vivo-demonstration-of-sarcoptes-scabiei
#13
Mehmet Salih Gürel, Aslı Vefa Turgut Erdemir, Burak Tekin
Scabies is a pruritic dermatosis caused by the ectoparasite Sarcoptes scabiei var. hominis. The diagnosis of scabies is usually made on clinical grounds, but histopathological and/or dermoscopic examinations may sometimes be of assistance. However, these diagnostic modalities do not offer a detailed in vivo demonstration of the motile microorganism. Reflectance confocal microscopy (RCM) is a relatively novel imaging modality that permits in vivo examination of the skin at a resolution similar to that used during similar to histopathologic resolution...
December 2017: Türkiye Parazitolojii Dergisi
https://www.readbyqxmd.com/read/29318167/a-comparison-of-cervical-spine-motion-after-immobilization-with-a-traditional-spine-board-and-full-body-vacuum-mattress-splint
#14
Brian E Etier, Grant E Norte, Megan M Gleason, Dustin L Richter, Kelli F Pugh, Keith B Thomson, Lindsay V Slater, Joe M Hart, Stephen F Brockmeier, David R Diduch
Background: The National Athletic Trainers' Association (NATA) advocates for cervical spine immobilization on a rigid board or vacuum splint and for removal of athletic equipment before transfer to an emergency medical facility. Purpose: To (1) compare triplanar cervical spine motion using motion capture between a traditional rigid spine board and a full-body vacuum splint in equipped and unequipped athletes, (2) assess cervical spine motion during the removal of a football helmet and shoulder pads, and (3) evaluate the effect of body mass on cervical spine motion...
December 2017: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/29317079/biotensegrity-and-myofascial-chains-a-global-approach-to-an-integrated-kinetic-chain
#15
S L Dischiavi, A A Wright, E J Hegedus, C M Bleakley
Human movement is a complex orchestration of events involving many different body systems. Understanding how these systems interact during musculoskeletal movements can directly inform a variety of research fields including: injury etiology, injury prevention and therapeutic exercise prescription. Traditionally scientists have examined human movement through a reductionist lens whereby movements are broken down and observed in isolation. The process of reductionism fails to capture the interconnected complexities and the dynamic interactions found within complex systems such as human movement...
January 2018: Medical Hypotheses
https://www.readbyqxmd.com/read/29316273/pilot-project-physiologic-responses-to-a-high-intensity-active-video-game-with-copd-patients-tools-for-home-rehabilitation
#16
Andrée-Anne Parent, Vincent Gosselin-Boucher, Marilyn Houle-Peloquin, Claude Poirier, Alain-Steve Comtois
INTRODUCTION: Chronic Obstructive Pulmonary Disease (COPD) is a respiratory condition that causes a significant deterioration of the quality of life. However, exercise can improve the quality of life for COPD patients and it is for this reason previous study observed the effects of active video games to increase exercise. Using motion capture devices with short bursts of exercise never been tried with COPD patients. OBJECTIVES: The objective was to observe the feasibility of using this device safely and easily with COPD patients...
January 8, 2018: Clinical Respiratory Journal
https://www.readbyqxmd.com/read/29315458/implementation-and-effectiveness-of-a-video-based-debriefing-programme-for-neonatal-resuscitation
#17
C Skåre, T E Calisch, E Saeter, T Rajka, A M Boldingh, B Nakstad, D E Niles, J Kramer-Johansen, T M Olasveengen
BACKGROUND: Approximately 5%-10% of newly born babies need intervention to assist transition from intra- to extrauterine life. All providers in the delivery ward are trained in neonatal resuscitation, but without clinical experience or exposure, training competency is transient with a decline in skills within a few months. The aim of this study was to evaluate whether neonatal resuscitations skills and team performance would improve after implementation of video-assisted, performance-focused debriefings...
January 7, 2018: Acta Anaesthesiologica Scandinavica
https://www.readbyqxmd.com/read/29315083/capture-consistently-acquired-projections-for-tuned-and-robust-estimation-a-self-navigated-respiratory-motion-correction-approach
#18
Cihat Eldeniz, Tyler Fraum, Amber Salter, Yasheng Chen, H Michael Gach, Parag J Parikh, Kathryn J Fowler, Hongyu An
OBJECTIVES: In this study, we present a fully automated and robust self-navigated approach to obtain 4-dimensional (4-D) motion-resolved images during free breathing. MATERIALS AND METHODS: The proposed method, Consistently Acquired Projections for Tuned and Robust Estimation (CAPTURE), is a variant of the stack-of-stars gradient-echo sequence. A 1-D navigator was consistently acquired at a fixed azimuthal angle for all stacks of spokes to reduce nonphysiological signal contamination due to system imperfections...
January 8, 2018: Investigative Radiology
https://www.readbyqxmd.com/read/29310946/validation-of-lumbar-spine-loading-from-a-musculoskeletal-model-including-the-lower-limbs-and-lumbar-spine
#19
Jason A Actis, Jasmin D Honegger, Deanna H Gates, Anthony J Petrella, Luis A Nolasco, Anne K Silverman
Low back mechanics are important to quantify to study injury, pain and disability. As in vivo forces are difficult to measure directly, modeling approaches are commonly used to estimate these forces. Validation of model estimates is critical to gain confidence in modeling results across populations of interest, such as people with lower-limb amputation. Motion capture, ground reaction force and electromyographic data were collected from ten participants without an amputation (five male/five female) and five participants with a unilateral transtibial amputation (four male/one female) during trunk-pelvis range of motion trials in flexion/extension, lateral bending and axial rotation...
December 13, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/29310637/reliability-and-validity-of-a-novel-kinect-based-software-program-for-measuring-posture-balance-and-side-bending
#20
Wilhelmus Johannes Andreas Grooten, Lisa Sandberg, John Ressman, Nicolas Diamantoglou, Elin Johansson, Eva Rasmussen-Barr
BACKGROUND: Clinical examinations are subjective and often show a low validity and reliability. Objective and highly reliable quantitative assessments are available in laboratory settings using 3D motion analysis, but these systems are too expensive to use for simple clinical examinations. Qinematic™ is an interactive movement analyses system based on the Kinect camera and is an easy-to-use clinical measurement system for assessing posture, balance and side-bending. The aim of the study was to test the test-retest the reliability and construct validity of Qinematic™ in a healthy population, and to calculate the minimal clinical differences for the variables of interest...
January 8, 2018: BMC Musculoskeletal Disorders
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