keyword
MENU ▼
Read by QxMD icon Read
search

Motion Capture

keyword
https://www.readbyqxmd.com/read/28748195/functional-brace-in-acl-surgery-force-quantification-in-an-in-vivo-study
#1
Robert F LaPrade, Melanie B Venderley, Kimi D Dahl, Grant J Dornan, Travis Lee Turnbull
BACKGROUND: A need exists for a functional anterior cruciate ligament (ACL) brace that dynamically supports the knee joint to match the angle-dependent forces of a native ACL, especially in the early postoperative period. PURPOSE/HYPOTHESIS: The purpose of this study was to quantify the posteriorly directed external forces applied to the anterior proximal tibia by both a static and a dynamic force ACL brace. The proximal strap forces applied by the static force brace were hypothesized to remain relatively constant regardless of knee flexion angle compared with those of the dynamic force brace...
July 2017: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/28747401/influence-of-scene-structure-and-content-on-visual-search-strategies
#2
Tatiana A Amor, Mirko Luković, Hans J Herrmann, José S Andrade
When searching for a target within an image, our brain can adopt different strategies, but which one does it choose? This question can be answered by tracking the motion of the eye while it executes the task. Following many individuals performing various search tasks, we distinguish between two competing strategies. Motivated by these findings, we introduce a model that captures the interplay of the search strategies and allows us to create artificial eye-tracking trajectories, which could be compared with the experimental ones...
July 2017: Journal of the Royal Society, Interface
https://www.readbyqxmd.com/read/28744040/an-estimation-of-knee-and-ankle-joint-angles-during-extension-phase-of-standing-up-motion-performed-using-an-inertial-sensor
#3
Fang Jin, Takayuki Nagasaki, Chikamune Wada
[Purpose] Motion capture system is difficult to use in daily life. The aim of this study was to propose an estimation model for knee and ankle joint angle measurements and locate body center of gravity (COG) of the extension phase during standing-up motion. [Subjects and Methods] Seven healthy male volunteers were enrolled. An estimation model was proposed for the knee and ankle joint angle measurements by combining the angle and acceleration of the trunk, based on readings from the inertial sensor attachment on the subject's chest, during the extension phase...
July 2017: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/28742277/the-immediate-and-short-term-effects-of-real-time-knee-adduction-moment-feedback-on-the-peak-and-cumulative-knee-load-during-walking
#4
Brennan Jackson, Keith E Gordon, Alison H Chang
The peak external knee adduction moment (pKAM), KAM impulse, and peak knee flexion moment (pKFM) during gait are important loading variables in medial tibiofemoral osteoarthritis. We evaluated the effects of gait modification, using real-time pKAM visual feedback, on pKAM, KAM impulse, and pKFM; and whether participants could maintain the KAM-reducing gait after feedback removal. Eleven healthy individuals performed a series of walking trials on a split-belt instrumented treadmill under 4 conditions of Baseline, Feedback, No Feedback Early, and No Feedback Late...
July 25, 2017: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/28742039/reconstructing-interlaced-high-dynamic-range-video-using-joint-learning
#5
Inchang Choi, Seung-Hwan Baek, Min H Kim
For extending the dynamic range of video, it is a common practice to capture multiple frames sequentially with different exposures and combine them to extend the dynamic range of each video frame. However, this approach results in typical ghosting artifacts due to fast and complex motion in nature. As an alternative, video imaging with interlaced exposures has been introduced to extend the dynamic range. However, the interlaced approach has been hindered by jaggy artifacts and sensor noise, leading to concerns over image quality...
July 24, 2017: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
https://www.readbyqxmd.com/read/28737675/3d-reconstruction-of-space-objects-from-multi-views-by-a-visible-sensor
#6
Haopeng Zhang, Quanmao Wei, Zhiguo Jiang
In this paper, a novel 3D reconstruction framework is proposed to recover the 3D structural model of a space object from its multi-view images captured by a visible sensor. Given an image sequence, this framework first estimates the relative camera poses and recovers the depths of the surface points by the structure from motion (SFM) method, then the patch-based multi-view stereo (PMVS) algorithm is utilized to generate a dense 3D point cloud. To resolve the wrong matches arising from the symmetric structure and repeated textures of space objects, a new strategy is introduced, in which images are added to SFM in imaging order...
July 22, 2017: Sensors
https://www.readbyqxmd.com/read/28737516/pre-therapy-neural-state-of-bilateral-motor-and-premotor-cortices-predicts-therapy-gain-after-subcortical-stroke-a-pilot-study
#7
Carmen M Cirstea, Phil Lee, Sorin C Craciunas, In-Young Choi, Joseph E Burris, Randolph J Nudo
OBJECTIVE: The aim of the study was to examine whether neural state of spared motor and premotor cortices captured before a therapy predicts therapy-related motor gains in chronic subcortical stroke. DESIGN: Ten survivors, presenting chronic moderate upper limb impairment, underwent proton magnetic resonance spectroscopy, magnetic resonance imaging, clinical, and kinematics assessments before a 4-wk impairment-oriented training. Clinical/kinematics assessments were repeated after therapy, and motor gain was defined as positive values of clinical upper limb/elbow motion changes and negative values of trunk motion changes...
July 22, 2017: American Journal of Physical Medicine & Rehabilitation
https://www.readbyqxmd.com/read/28736672/handheld-optical-coherence-tomography-angiography
#8
Jianlong Yang, Liang Liu, J Peter Campbell, David Huang, Gangjun Liu
We developed a handheld optical coherence tomography angiography (OCTA) system using a 100-kHz swept-source laser. The handheld probe weighs 0.4 kg and measures 20.6 × 12.8 × 4.6 cm(3). The system has dedicated features for handheld operation. The probe is equipped with a mini iris camera for easy alignment. Real-time display of the en face OCT and cross-sectional OCT images in the system allows accurately locating the imaging target. Fast automatic focusing was achieved by an electrically tunable lens controlled by a golden-section search algorithm...
April 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/28734544/lower-limb-joint-work-and-joint-work-contribution-during-downhill-and-uphill-walking-at-different-inclinations
#9
Nathalie Alexander, Gerda Strutzenberger, Lisa Maria Ameshofer, Hermann Schwameder
Work performance and individual joint contribution to total work are important information for creating training protocols, but were not assessed so far for sloped walking. Therefore, the purpose of this study was to analyze lower limb joint work and joint contribution of the hip, knee and ankle to total lower limb work during sloped walking in a healthy population. Eighteen male participants (27.0±4.7yrs, 1.80±0.05m, 74.5±8.2kg) walked on an instrumented ramp at inclination angles of 0°, ±6°, ±12° and ±18° at 1...
July 11, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28733769/communication-for-coordination-gesture-kinematics-and-conventionality-affect-synchronization-success-in-piano-duos
#10
Laura Bishop, Werner Goebl
Ensemble musicians often exchange visual cues in the form of body gestures (e.g., rhythmic head nods) to help coordinate piece entrances. These cues must communicate beats clearly, especially if the piece requires interperformer synchronization of the first chord. This study aimed to (1) replicate prior findings suggesting that points of peak acceleration in head gestures communicate beat position and (2) identify the kinematic features of head gestures that encourage successful synchronization. It was expected that increased precision of the alignment between leaders' head gestures and first note onsets, increased gesture smoothness, magnitude, and prototypicality, and increased leader ensemble/conducting experience would improve gesture synchronizability...
July 21, 2017: Psychological Research
https://www.readbyqxmd.com/read/28732969/suspension-characteristics-of-water-droplet-in-oil-under-ultrasonic-standing-waves
#11
Xiaoming Luo, Juhang Cao, Jing Ren, Haipeng Yan, Limin He
The suspension characteristics of water droplet in oil were investigated under ultrasonic standing waves with high-speed photography in this paper. Firstly, the suspension position of droplet was predicted by theoretical derivation. The motion trajectory of droplet was captured and a kinetic analysis was applied to characterize the suspension position of droplet. The effects of droplet size, acoustic pressure, frequency, as well as density ratio of water and oil on the suspension position of droplet were analyzed in details...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28729058/impacts-of-sensation-perception-and-motor-abilities-of-the-ipsilesional-upper-limb-on-hand-functions-in-unilateral-stroke-quantifications-from-biomechanical-and-functional-perspectives
#12
Hsiu-Yun Hsu, Chia-Wen Ke, Ta-Shen Kuan, Hsiu-Ching Yang, Ching-Liang Tsai, Li-Chieh Kuo
BACKGROUND: The presence of subtle losses in hand dexterity after stroke impacts the regaining of independence with regard to activities of daily living. Therefore, awareness of ipsilesional upper extremity (UE) function may be of importance when drafting a comprehensive rehabilitation program. However, current hand function tests seem to be unable to identify asymptomatic UE impairments. OBJECTIVES: To assess the motor coordination as well as the sensory-perception of an ipsilesional UE using biomechanical analysis of performance-oriented tasks and conducting a Manual Tactile Test (MTT)...
July 17, 2017: PM & R: the Journal of Injury, Function, and Rehabilitation
https://www.readbyqxmd.com/read/28728130/superficial-plantar-cutaneous-sensation-does-not-trigger-barefoot-running-adaptations
#13
M A Thompson, K M Hoffman
It has long been proposed that the gait alterations associated with barefoot running are mediated by alterations in sensory feedback, yet there has been no data to support this claim. Thus, the purpose of this study was to examine the role of superficial plantar cutaneous feedback in barefoot and shod running. METHODS: 10 healthy active subjects (6 male, 4 female); mass: 65.2+9.7kg; age: 27+7.1years participated in this study. 10 over-ground running trials were completed in each of the following conditions: barefoot (BF), shod (SHOD), anesthetized barefoot (ANEST BF) and anesthetized shod (ANEST SHOD)...
June 27, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28727553/flycap-markerless-motion-capture-using-multiple-autonomous-flying-cameras
#14
Lan Xu, Yebin Liu, Wei Cheng, Kaiwen Guo, Guyue Zhou, Qionghai Dai, Lu Fang
Aiming at automatic, convenient and non-instrusive motion capture, this paper presents a new generation markerless motion capture technique, the FlyCap system, to capture surface motions of moving characters using multiple autonomous flying cameras (autonomous unmanned aerial vehicles(UAVs) each integrated with an RGBD video camera). During data capture, three cooperative flying cameras automatically track and follow the moving target who performs large-scale motions in a wide space. We propose a novel non-rigid surface registration method to track and fuse the depth of the three flying cameras for surface motion tracking of the moving target, and simultaneously calculate the pose of each flying camera...
July 18, 2017: IEEE Transactions on Visualization and Computer Graphics
https://www.readbyqxmd.com/read/28725529/recent-progress-on-piezoelectric-and-triboelectric-energy-harvesters-in-biomedical-systems
#15
REVIEW
Qiang Zheng, Bojing Shi, Zhou Li, Zhong Lin Wang
Implantable medical devices (IMDs) have become indispensable medical tools for improving the quality of life and prolonging the patient's lifespan. The minimization and extension of lifetime are main challenges for the development of IMDs. Current innovative research on this topic is focused on internal charging using the energy generated by the physiological environment or natural body activity. To harvest biomechanical energy efficiently, piezoelectric and triboelectric energy harvesters with sophisticated structural and material design have been developed...
July 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
https://www.readbyqxmd.com/read/28724784/representing-delayed-force-feedback-as-a-combination-of-current-and-delayed-states
#16
Guy Avraham, Firas Mawase, Amir Karniel, Lior Shmuelof, Opher Donchin, Ferdinando A Mussa-Ivaldi, Ilana Nisky
To adapt to deterministic force perturbations that depend on the current state of the hand, internal representations are formed to capture the relationships between forces experienced and motion. However, information from multiple modalities travels at different rates, resulting in intermodal delays that require compensation for these internal representations to develop. To understand how these delays are represented by the brain, we presented participants with delayed velocity-dependent force fields; i.e., forces that depend on hand velocity either 70 or 100 ms beforehand...
July 19, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28724735/dual-function-of-the-pectoral-girdle-for-feeding-and-locomotion-in-white-spotted-bamboo-sharks
#17
Ariel L Camp, Bradley Scott, Elizabeth L Brainerd, Cheryl D Wilga
Positioned at the intersection of the head, body and forelimb, the pectoral girdle has the potential to function in both feeding and locomotor behaviours-although the latter has been studied far more. In ray-finned fishes, the pectoral girdle attaches directly to the skull and is retracted during suction feeding, enabling the ventral body muscles to power rapid mouth expansion. However, in sharks, the pectoral girdle is displaced caudally and entirely separate from the skull (as in tetrapods), raising the question of whether it is mobile during suction feeding and contributing to suction expansion...
July 26, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28723790/relationship-of-medial-gastrocnemius-relative-fascicle-excursion-and-ankle-joint-power-and-work-performance-during-gait-in-typically-developing-children-a-cross-sectional-study
#18
Teresa Martín Lorenzo, Gustavo Albi Rodríguez, Eduardo Rocon, Ignacio Martínez Caballero, Sergio Lerma Lara
Muscle fascicles lengthen in response to chronic passive stretch through in-series sarcomere addition in order to maintain an optimum sarcomere length. In turn, the muscles' force generating capacity, maximum excursion, and contraction velocity is enhanced. Thus, longer fascicles suggest a greater capacity to develop joint power and work. However, static fascicle length measurements may not be taking sarcomere length differences into account. Thus, we considered relative fascicle excursions through passive ankle dorsiflexion may better correlate with the capacity to generate joint power and work than fascicle length...
July 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28719977/the-efficacy-of-interactive-motion-capture-based-rehabilitation-on-functional-outcomes-in-an-inpatient-stroke-population-a-randomized-controlled-trial
#19
John Cannell, Emelyn Jovic, Amy Rathjen, Kylie Lane, Anna M Tyson, Michele L Callisaya, Stuart T Smith, Kiran Dk Ahuja, Marie-Louise Bird
OBJECTIVE: To compare the efficacy of novel interactive, motion capture-rehabilitation software to usual care stroke rehabilitation on physical function. DESIGN: Randomized controlled clinical trial. SETTING: Two subacute hospital rehabilitation units in Australia. PARTICIPANTS: In all, 73 people less than six months after stroke with reduced mobility and clinician determined capacity to improve. INTERVENTIONS: Both groups received functional retraining and individualized programs for up to an hour, on weekdays for 8-40 sessions (dose matched)...
July 1, 2017: Clinical Rehabilitation
https://www.readbyqxmd.com/read/28718754/rhythmic-interlimb-coordination-impairments-are-associated-with-mobility-limitations-among-older-adults
#20
Eric G James, Suzanne G Leveille, Jeffrey M Hausdorff, Thomas Travison, Sarah Cote, Philip Conatser, Murat Karabulut, Andrea C Mendes, David N Kennedy, Katherine L Tucker, Soham Al Snih, Kyriakos S Markides, Jonathan F Bean
Background/Study Context: Mobility limitations affect more than 25% of adults aged 70 years or older. This study tested the hypothesis that impairments in ankle and shoulder coordination are associated with mobility limitations among older adults. METHODS: his study consisted of conducted a cross-sectional analysis from a sample of community-dwelling older adults (N = 130) aged ≥67 years. Motion capture equipment was used to collect kinematic data during rhythmic antiphase coordination of the right and left: (a) ankles moving in dorsi-plantarflexion; and (b) glenohumeral ("shoulder") moving in flexion-extension while paced by an auditory metronome...
July 2017: Experimental Aging Research
keyword
keyword
71141
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"