keyword
MENU ▼
Read by QxMD icon Read
search

Movement patterns

keyword
https://www.readbyqxmd.com/read/28817715/longitudinal-sequencing-in-intramuscular-coordination-a-new-hypothesis-of-dynamic-functions-in-the-human-rectus-femoris-muscle
#1
Christoph von La├čberg, Julia A Schneid, Dominik Graf, Felix Finger, Walter Rapp, Norman Stutzig
The punctum fixum-punctum mobile model has been introduced in previous publications. It describes general principles of intersegmental neuromuscular succession patterns to most efficiently generate specific movement intentions. The general hypothesis of this study is that these principles-if they really do indicate a fundamental basis for efficient movement generation-should also be found in intramuscular coordination and should be indicated by "longitudinal sequencing" between fibers according to the principles of the punctum fixum-punctum mobile model...
2017: PloS One
https://www.readbyqxmd.com/read/28817708/timing-and-extent-of-finger-force-enslaving-during-a-dynamic-force-task-cannot-be-explained-by-emg-activity-patterns
#2
Mojtaba Mirakhorlo, Huub Maas, DirkJan H E J Veeger
Finger enslaving is defined as the inability of the fingers to move or to produce force independently. Such finger enslaving has predominantly been investigated for isometric force tasks. The aim of this study was to assess whether the extent of force enslaving is dependent on relative finger movements. Ten right-handed subjects (22-30 years) flexed the index finger while counteracting constant resistance forces (4, 6 and 8 N) orthogonal to the fingertip. The other, non-instructed fingers were held in extension...
2017: PloS One
https://www.readbyqxmd.com/read/28817699/cooperative-dynamics-of-neighborhood-economic-status-in-cities
#3
Anand Sahasranaman, Henrik Jeldtoft Jensen
We significantly extend our earlier variant of the Schelling model, incorporating a neighborhood Potential function as well as an agent wealth gain function to study the long term evolution of the economic status of neighborhoods in cities. We find that the long term patterns of neighborhood relative economic status (RES) simulated by this model reasonably replicate the empirically observed patterns from American cities. Specifically, we find that larger fractions of rich and poor neighborhoods tend to, on average, retain status for longer than lower- and upper-middle wealth neighborhoods...
2017: PloS One
https://www.readbyqxmd.com/read/28816827/the-relationship-between-fear-avoidance-and-objective-biomechanical-measures-of-function-in-patients-with-adult-degenerative-scoliosis
#4
Ram Haddas, Isador H Lieberman, Andrew Block
STUDY DESIGN: A prospective cohort study. OBJECTIVE: The current study utilized quantitative gait analysis to examine the relationship of fear-avoidance beliefs to gait patterns in patients with adult degenerative scoliosis (ADS). SUMMARY OF BACKGROUND DATA: Among patients with chronic spine pain, fear-avoidance beliefs are predictive of behavioral deficiencies, poor work and surgery outcomes. The impact of such beliefs on patients with major spinal deformity has yet to be investigated...
August 14, 2017: Spine
https://www.readbyqxmd.com/read/28816473/the-effects-of-context-on-processing-words-during-sentence-reading-among-adults-varying-in-age-and-literacy-skill
#5
Allison A Steen-Baker, Shukhan Ng, Brennan R Payne, Carolyn J Anderson, Kara D Federmeier, Elizabeth A L Stine-Morrow
The facilitation of word processing by sentence context reflects the interaction between the build-up of message-level semantics and lexical processing. Yet, little is known about how this effect varies through adulthood as a function of reading skill. In this study, Participants 18-64 years old with a range of literacy competence read simple sentences as their eye movements were monitored. We manipulated the predictability of a sentence-final target word, operationalized as cloze probability. First fixation durations showed an interaction between age and literacy skill, decreasing with age among more skilled readers but increasing among less skilled readers...
August 2017: Psychology and Aging
https://www.readbyqxmd.com/read/28814887/shp2-overexpression-enhances-the-invasion-and-metastasis-of-ovarian-cancer-in-vitro-and-in-vivo
#6
ZhongQian Hu, Jia Li, Qi Gao, Shuping Wei, Bin Yang
PURPOSE: SHP2 has roles in a variety of signal transduction pathways and in many important cellular processes, including proliferation, differentiation, movement regulation, and apoptosis. In addition, SHP2 expression is closely associated with multiple types of malignancies. In this study, we examined the role of SHP2 in epithelial ovarian cancer. PATIENTS AND METHODS: SHP2 expression in cancer and normal ovarian tissue specimens was evaluated by immunohistochemical staining and Western blot analyses...
2017: OncoTargets and Therapy
https://www.readbyqxmd.com/read/28814646/the-intracellular-immune-receptor-sw-5b-confers-broad-spectrum-resistance-to-tospoviruses-through-recognition-of-a-conserved-21-amino-acid-viral-effector-epitope
#7
Min Zhu, Lei Jiang, Baohui Bai, Wenyang Zhao, Xiaojiao Chen, Jia Li, Yong Liu, Zhengqiang Chen, Boting Wang, Chunli Wang, Qian Wu, Qian-Hua Shen, Savithramma P Dinesh-Kumar, Xiaorong Tao
Plants use both cell surface-resident pattern-recognition receptors (PRRs) and intracellular nucleotide-binding leucine-rich repeat (NLR) receptors to detect various pathogens. Plant PRRs typically recognize conserved pathogen-associated molecular patterns (PAMPs) to provide broad-spectrum resistance. By contrast, plant NLRs generally detect pathogen strain-specific effectors and confer race-specific resistance. Here, we demonstrate that the tomato NLR Sw-5b confers broad-spectrum resistance against American type tospoviruses by recognizing a conserved 21-amino-acid peptide region within viral movement protein NSm (NSm21)...
August 16, 2017: Plant Cell
https://www.readbyqxmd.com/read/28814029/vibrotactile-feedback-to-control-the-amount-of-weight-shift-during-walking-a-first-step-towards-better-control-of-an-exoskeleton-for-spinal-cord-injury-subjects
#8
Heidi J B Muijzer-Witteveen, Sara Nataletti, Martina Agnello, Maura Casadio, Edwin H F van Asseldonk
People with Spinal Cord Injury do not only lack the ability to control their muscles, but also miss the sensory information from below the level of their lesion. Therefore, it may become difficult for them to perceive the state of the body during walking, which is however often used to control wearable exoskeletons. In the present study the possibilities of providing vibrotactile feedback about the Center of Mass (CoM) during walking were investigated. The results showed that healthy subjects could successfully interpret the provided vibrotactile cues and change their walking pattern accordingly...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28814025/learning-from-demonstration-teaching-a-myoelectric-prosthesis-with-an-intact-limb-via-reinforcement-learning
#9
Gautham Vasan, Patrick M Pilarski
Prosthetic arms should restore and extend the capabilities of someone with an amputation. They should move naturally and be able to perform elegant, coordinated movements that approximate those of a biological arm. Despite these objectives, the control of modern-day prostheses is often nonintuitive and taxing. Existing devices and control approaches do not yet give users the ability to effect highly synergistic movements during their daily-life control of a prosthetic device. As a step towards improving the control of prosthetic arms and hands, we introduce an intuitive approach to training a prosthetic control system that helps a user achieve hard-to-engineer control behaviours...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813991/voluntary-phantom-hand-and-finger-movements-in-transhumerai-amputees-could-be-used-to-naturally-control-polydigital-prostheses
#10
Nathanael Jarrasse, Caroline Nicol, Florian Richer, Amelie Touillet, Noel Martinet, Jean Paysant, Jozina B De Graaf
An arm amputation is extremely invalidating since many of our daily tasks require bi-manual and precise control of hand movements. Perfect hand prostheses should therefore offer a natural, intuitive and cognitively simple control over their numerous biomimetic active degrees of freedom. While efficient polydigital prostheses are commercially available, their control remains complex to master and offers limited possibilities, especially for high amputation levels. In this pilot study, we demonstrate the possibility for upper-arm amputees to intuitively control a polydigital hand prosthesis by using surface myoelectric activities of residual limb muscles (sEMG) associated with phantom limb movements, even if these residual arm muscles on which the phantom activity is measured were not naturally associated with hand movements before amputation...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813986/evaluation-of-the-myo-armband-for-the-classification-of-hand-motions
#11
I Mendez, B W Hansen, C M Grabow, E J L Smedegaard, N B Skogberg, X J Uth, A Bruhn, B Geng, E N Kamavuako
Pattern recognition-based control systems have been widely investigated in prostheses and virtual reality environments to improve amputees' quality of life. Most of these systems use surface electromyography (EMG) to detect user movement intentions. The Myo armband (MYB) is a wireless wearable device, developed by Thalmic Labs, which enables EMG recordings with a limited bandwidth (<100Hz). The aim of this study was to compare MYB's narrow bandwidth with a conventional EMG acquisition system (CONV) that captures the full EMG spectrum to assess its suitability for pattern recognition control...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813944/robotic-set-up-to-quantify-hand-eye-behavior-in-motor-execution-and-learning-of-children-with-autism-spectrum-disorder
#12
Claudia Casellato, Marta Gandolla, Alessandro Crippa, Alessandra Pedrocchi
Autism spectrum disorder (ASD) is a multifaceted neurodevelopmental disorder characterized by a persistence of social and communication impairment, and restricted and repetitive behaviors. However, motor disorders have also been described, but not objectively assessed. Most studies showed inefficient eye-hand coordination and motor learning in children with ASD; in other experiments, mechanisms of acquisition of internal models in self-generated movements appeared to be normal in autism. In this framework, we have developed a robotic protocol, recording gaze and hand data during upper limb tasks, in which a haptic pen-like handle is moved along specific trajectories displayed on the screen...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813881/simulation-of-variable-impedance-as-an-intervention-for-upper-extremity-motor-exploration
#13
Felix C Huang
Current methods in robot-assisted therapy are limited in providing predictions of the effectiveness of interventions. Our approach focuses on how robotic interaction can impact the distribution of movements expressed in the arm. Using data from a previous study with stroke survivors (n=10), we performed simulations to examine how changes in hand endpoint impedance would alter exploratory motion. We present methods for designing a custom training intervention, by relating the desired change in acceleration covariance in planar motion with a corresponding change in inertia matrix...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813874/effect-of-human-robot-interaction-on-muscular-synergies-on-healthy-people-and-post-stroke-chronic-patients
#14
A Scano, A Chiavenna, M Caimmi, M Malosio, L M Tosatti, F Molteni
Robot-assisted training is a widely used technique to promote motor re-learning on post-stroke patients that suffer from motor impairment. While it is commonly accepted that robot-based therapies are potentially helpful, strong insights about their efficacy are still lacking. The motor re-learning process may act on muscular synergies, which are groups of co-activating muscles that, being controlled as a synergic group, allow simplifying the problem of motor control. In fact, by coordinating a reduced amount of neural signals, complex motor patterns can be elicited...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813846/closed-loop-emg-informed-model-based-analysis-of-human-musculoskeletal-mechanics-on-rough-terrains
#15
C Varotto, Z Sawacha, L Gizzi, D Farina, M Sartori
This work aims at estimating the musculoskeletal forces acting in the human lower extremity during locomotion on rough terrains. We employ computational models of the human neuro-musculoskeletal system that are informed by multi-modal movement data including foot-ground reaction forces, 3D marker trajectories and lower extremity electromyograms (EMG). Data were recorded from one healthy subject locomoting on rough grounds realized using foam rubber blocks of different heights. Blocks arrangement was randomized across all locomotion trials to prevent adaptation to specific ground morphology...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813836/development-of-new-rehabilitation-robot-device-that-can-be-attached-to-the-conventional-knee-ankle-foot-orthosis-for-controlling-the-knee-in-individuals-after-stroke
#16
Kawasaki Shihomi, Ohata Koji, Tsuboyama Tadao, Sawada Yuichi, Higashi Yoshiyuki
This research developed a device that can be attached to the conventional Knee-Ankle-Foot-Orthosis for controlling the knee in individuals after stroke. The device automatically assists the flexion and extension movements of the knee joint at the appropriate timing. We aimed to clarify the effect of this device on gait performance, kinematic pattern and muscle activation during gait. Seventeen participants after stroke were recruited in this study. They walked with this device for 3 minutes, and we measured the 10m gait time, number of steps, knee motion using electric goniometer and muscle activities of lower limbs during gait...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813823/a-generalized-framework-to-achieve-coordinated-admittance-control-for-multi-joint-lower-limb-robotic-exoskeleton
#17
Kai Gui, Honghai Liu, Dingguo Zhang
Traditional joint space admittance controller for N-DOF robotic systems is complexity and easily leads to incongruous movement among all joints. Our study introduces a central pattern generator (CPG) network into one-dimension joint space admittance control for the custom-made lower limb robotic exoskeleton with four DOFs, to guarantee the coordinated movement and security of users. The predefined trajectories for four joints are produced by CPG. Unilateral knee joint torque of subjects is detected based on corresponding muscle EMG signals...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813812/characterization-of-surface-electromyography-patterns-of-healthy-and-incomplete-spinal-cord-injury-subjects-interacting-with-an-upper-extremity-exoskeleton
#18
Craig G McDonald, Troy A Dennis, Marcia K O'Malley
Rehabilitation exoskeletons may make use of myoelectric control to restore in patients with significant motor impairment following a spinal cord injury (SCI) a sense of volitional control over their limb - a crucial component for recovery of movement. Little investigation has been done into the feasibility of using surface electromyography (sEMG) as an exoskeleton control interface for SCI patients, whose impairment manifests in a highly variable way across the patient population. We have demonstrated that by using only a small subset of features extracted from eight bipolar electrodes recording on the upper arm and forearm muscles, we can achieve high predictive accuracy for the intended direction of motion...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813454/applying-machine-learning-to-identify-autistic-adults-using-imitation-an-exploratory-study
#19
Baihua Li, Arjun Sharma, James Meng, Senthil Purushwalkam, Emma Gowen
Autism spectrum condition (ASC) is primarily diagnosed by behavioural symptoms including social, sensory and motor aspects. Although stereotyped, repetitive motor movements are considered during diagnosis, quantitative measures that identify kinematic characteristics in the movement patterns of autistic individuals are poorly studied, preventing advances in understanding the aetiology of motor impairment, or whether a wider range of motor characteristics could be used for diagnosis. The aim of this study was to investigate whether data-driven machine learning based methods could be used to address some fundamental problems with regard to identifying discriminative test conditions and kinematic parameters to classify between ASC and neurotypical controls...
2017: PloS One
https://www.readbyqxmd.com/read/28813029/joint-mobile-data-collection-and-wireless-energy-transfer-in-wireless-rechargeable-sensor-networks
#20
Ping Zhong, Ya-Ting Li, Wei-Rong Liu, Gui-Hua Duan, Ying-Wen Chen, Neal Xiong
In wireless rechargeable sensor networks (WRSNs), there is a way to use mobile vehicles to charge node and collect data. It is a rational pattern to use two types of vehicles, one is for energy charging, and the other is for data collecting. These two types of vehicles, data collection vehicles (DCVs) and wireless charging vehicles (WCVs), are employed to achieve high efficiency in both data gathering and energy consumption. To handle the complex scheduling problem of multiple vehicles in large-scale networks, a twice-partition algorithm based on center points is proposed to divide the network into several parts...
August 16, 2017: Sensors
keyword
keyword
116379
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"