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Movement variability

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https://www.readbyqxmd.com/read/29791683/the-t-loop-in-details
#1
Amanda Frizzo Viecilli, Maria Perpétua Mota Freitas
INTRODUCTION: The T-loop as designed by Burstone is a space closure spring used in the rational application of orthodontic biomechanics. Despite the diversity of studies, there is still no consensus on the optimal parametric characteristics for its conformation. OBJECTIVE: This study aimed at reviewing the literature on the force systems released by different conformations of the T-loop, according to the type of anchorage and the main characteristics and factors that influence them...
January 2018: Dental Press Journal of Orthodontics
https://www.readbyqxmd.com/read/29790820/towards-quantitative-18f-fdg-pet-mri-of-the-brain-automated-mr-driven-calculation-of-an-image-derived-input-function-for-the-non-invasive-determination-of-cerebral-glucose-metabolic-rates
#2
Lalith Ks Sundar, Otto Muzik, Lucas Rischka, Andreas Hahn, Ivo Rausch, Rupert Lanzenberger, Marius Hienert, Eva-Maria Klebermass, Frank-Günther Füchsel, Marcus Hacker, Magdalena Pilz, Ekaterina Pataraia, Tatjana Traub-Weidinger, Thomas Beyer
Absolute quantification of PET brain imaging requires the measurement of an arterial input function (AIF), typically obtained invasively via an arterial cannulation. We present an approach to automatically calculate an image-derived input function (IDIF) and cerebral metabolic rates of glucose (CMRGlc) from the [18F]FDG PET data using an integrated PET/MRI system. Ten healthy controls underwent test-retest dynamic [18F]FDG-PET/MRI examinations. The imaging protocol consisted of a 60-min PET list-mode acquisition together with a time-of-flight MR angiography scan for segmenting the carotid arteries and intermittent MR navigators to monitor subject movement...
January 1, 2018: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/29790684/the-effect-of-music-on-the-cardiac-activity-of-a-fetus-in-a-cardiotocographic-examination
#3
Grażyna Gebuza, Marta Zaleska, Marzena Kaźmierczak, Estera Mieczkowska, Małgorzata Gierszewska
BACKGROUND: Music therapy as an adjunct to treatment is rarely used in perinatology and obstetrics, despite the proven therapeutic effect. Auditory stimulation through music positively impacts the health of adults and infants, its special role being observed in the development of prematurely born neonates. It is equally interesting how music impacts fetuses. OBJECTIVES: The aim of this study is to assess the parameters of fetuses through cardiotocographic recording in women in the 3rd trimester of pregnancy while listening to Pyotr Tchaikovsky's "Sleeping Beauty" and "Swan Lake...
April 24, 2018: Advances in Clinical and Experimental Medicine: Official Organ Wroclaw Medical University
https://www.readbyqxmd.com/read/29787868/individualized-tractography-based-parcellation-of-the-globus-pallidus-pars-interna-using-7t-mri-in-movement-disorder-patients-prior-to-dbs-surgery
#4
Rémi Patriat, Scott E Cooper, Yuval Duchin, Jacob Niederer, Christophe Lenglet, Joshua Aman, Michael C Park, Jerrold Vitek, Noam Harel
The success of deep brain stimulation (DBS) surgeries for the treatment of movement disorders relies on the accurate placement of an electrode within the motor portion of subcortical brain targets. However, the high number of electrodes requiring relocation indicates that today's methods do not ensure sufficient accuracy for all patients. Here, with the goal of aiding DBS targeting, we use 7 T (T) MRI data to identify the functional territories and parcellate the globus pallidus interna (GPi) into motor, associative and limbic regions in individual subjects...
May 19, 2018: NeuroImage
https://www.readbyqxmd.com/read/29785882/the-relationship-between-repetitive-finger-movement-and-quality-of-life-in-parkinson-s-disease
#5
Elizabeth L Stegemöller, Jennifer Uzochukwu, Mack Shelley
BACKGROUND: Repetitive finger movement significantly impacts daily living activities, but there have been limited studies determining how repetitive finger movement impacts quality of life (QOL) in persons with Parkinson's disease (PD). The purpose of this study was to determine the relationship between impairment in repetitive finger movement and QOL in persons with PD. METHODS: Eighty-four participants with PD completed a repetitive movement task and the Parkinson's Disease Questionnaire (PDQ)...
May 22, 2018: Neurological Research
https://www.readbyqxmd.com/read/29785097/inter-gender-differences-of-balance-indicators-in-persons-60-90-years-of-age
#6
Ewa Puszczalowska-Lizis, Przemyslaw Bujas, Slawomir Jandzis, Jaroslaw Omorczyk, Marek Zak
Introduction: Precision of movements responsible for maintaining balance deteriorates with age due to natural involutionary processes, thus prompting a research question whether the values of gender-related stability indicators might differ significantly among the study subjects over 60 years of age. Methods: The study group comprised 136 seniors (89 women, 47 men; aged 60-90 years). The CQ-Stab 2P 2-platform posturograph was used as the main research device, whereas the Mann-Whitney U -test was used to evaluate the gender-related differences in the average level of variables...
2018: Clinical Interventions in Aging
https://www.readbyqxmd.com/read/29784628/why-physics-in-medicine
#7
Ehsan Samei, Thomas M Grist
Despite its crucial role in the development of new medical imaging technologies, in clinical practice, physics has primarily been involved in the technical evaluation of technologies. However, this narrow role is no longer adequate. New trajectories in medicine call for a stronger role for physics in the clinic. The movement toward evidence-based, quantitative, and value-based medicine requires physicists to play a more integral role in delivering innovative precision care through the intentional clinical application of physical sciences...
May 18, 2018: Journal of the American College of Radiology: JACR
https://www.readbyqxmd.com/read/29783905/effects-of-lorazepam-on-saccadic-eye-movements-the-role-of-sex-task-characteristics-and-baseline-traits
#8
Ulrich Ettinger, Inga Meyhöfer, Mitul A Mehta, Veena Kumari, Philip J Corr, Steven Cr Williams, Adam M Perkins
BACKGROUND: Saccadic eye movements are controlled by a network of parietal, frontal, striatal, cerebellar and brainstem regions. The saccadic peak velocity is an established biomarker of benzodiazepine effects, with benzodiazepines reliably reducing the peak velocity. AIMS: In this study, we aimed to replicate the effects of benzodiazepines on peak velocity and we investigated effects on previously less studied measures of saccades. We also explored the roles of sex, task characteristics and the baseline variables age, intelligence and trait anxiety in these effects...
May 1, 2018: Journal of Psychopharmacology
https://www.readbyqxmd.com/read/29782814/primary-assessment-of-the-patient-with-orbital-fractures-should-include-pupillary-response-and-visual-acuity-changes-to-detect-occult-major-ocular-injuries
#9
Jeffrey Chow, Krishnan Parthasarathi, Patrick Mehanna, Eline Whist
PURPOSE: Sight-threatening injuries associated with orbital fractures are of major concern to maxillofacial surgeons whom are often the first asked to assess these patients. Eliciting signs and symptoms that are predictive of these injuries would allow expedited ophthalmic consultation and appropriate management. We hypothesized that abnormal pupillary response is predictive of major ocular injuries. PATIENTS AND METHODS: A retrospective cohort study of patients with facial fractures was instituted with review of all associated ophthalmic injuries...
May 1, 2018: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/29781118/ballistic-tongue-projection-in-a-miniaturized-salamander
#10
Stephen M Deban, Segall V Bloom
Miniaturization of body size is often accompanied by peculiarities in morphology that can have functional consequences. We examined the feeding behavior and morphology of the miniaturized plethodontid salamander Thorius, one of the smallest vertebrates, to determine if its performance and biomechanics differ from those of its larger relatives. High-speed imaging and dynamics analysis of feeding at a range of temperatures show that tongue projection in Thorius macdougalli is ballistic and achieves accelerations of up to 600 G with low thermal sensitivity, indicating that tongue projection is powered by an elastic-recoil mechanism...
May 20, 2018: Journal of Experimental Zoology. Part A, Ecological and Integrative Physiology
https://www.readbyqxmd.com/read/29781091/fetal-assessment-in-buprenorphine-maintained-women-using-fetal-magnetoencephalography-a-pilot-study
#11
Diana Escalona-Vargas, Jessica L Coker, Shona Ray-Griffith, Eric R Siegel, Curtis L Lowery, Zachary N Stowe, Hari Eswaran
BACKGROUND AND AIMS: In-utero exposure to opioids including buprenorphine (BUP) has been shown to affect fetal activity, specifically heart-rate variability (FHRV) and fetal movement (FM). Our objective was to extract simultaneous recordings of fetal cardiac, and brain-related activity in BUP-maintained and non-opioid exposed pregnant women using a novel non-invasive biomagnetic technique. DESIGN: A pilot study was conducted, recording and analyzing biomagnetic data from fetuses of BUP-maintained and non-opioid exposed pregnant women...
May 20, 2018: Addiction
https://www.readbyqxmd.com/read/29778979/exploring-the-relationship-between-stability-and-variability-of-the-centre-of-mass-and-centre-of-pressure
#12
Roshanth Rajachandrakumar, Jotvarinder Mann, Alison Schinkel-Ivy, Avril Mansfield
BACKGROUND: There are competing perspectives in the literature regarding the role of movement variability in quiet standing and balance control. Some view high variability as indicative of poor balance control and a contributor to increased fall risk, whereas others view variability as beneficial in providing sensory information that aids balance control. RESEARCH QUESTION: This study aimed to help to clarify the role of variability in balance control by testing two competing hypotheses: that increased variability would lead to instability, or that increased variability would improve stability, where stability is defined as the ability to respond to a perturbation...
May 9, 2018: Gait & Posture
https://www.readbyqxmd.com/read/29778689/network-analysis-of-a-proposed-exit-pathway-for-protons-to-the-p-side-of-cytochrome-c-oxidase
#13
Xiuhong Cai, Kamran Haider, Jianxun Lu, Slaven Radic, Chang Yun Son, Qiang Cui, M R Gunner
Cytochrome c Oxidase (CcO) reduces O2 , the terminal electron acceptor, to water in the aerobic respiration electron transport chain. The energy released by O2 reductions is stored by removing eight protons from the high pH, N-side, of the membrane with four used for chemistry in the active site and four pumped to the low pH, P-side. The proton transfers must occur along controllable proton pathways that prevent energy dissipating movement towards the N-side. The CcO N-side has well established D- and K-channels to deliver protons to the protein interior...
May 17, 2018: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/29778340/prospective-randomized-controlled-trial-of-polymer-cable-ties-versus-standard-wire-closure-of-midline-sternotomy
#14
Silvana F Marasco, Louise Fuller, Adam Zimmet, David McGiffin, Michael Seitz, Stephanie Ch'ng, Shivanand Gangahanumaiah, Michael Bailey
OBJECTIVE: Midline sternotomy remains the most common access incision for cardiac operations. Traditionally, the sternum is closed with stainless steel wires. Wires are well known to stretch and break, however, leading to pain, nonunion, and potential deep sternal wound infection. We hypothesized that biocompatible plastic cable ties would achieve a more rigid sternal fixation, reducing postoperative pain and analgesia requirements. METHODS: A prospective, randomized study compared the ZIPFIX (De Puy Synthes, West Chester, Pa) sternal closure system (n = 58) with standard stainless steel wires (n = 60)...
April 16, 2018: Journal of Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/29778064/is-the-limit-cycle-attractor-an-almost-invariable-characteristic-in-human-walking
#15
Kim-Charline Broscheid, Christian Dettmers, Manfred Vieten
BACKGROUND: Common methods of gait analyses measure step length/width, gait velocity and gait variability to name just a few. Those parameters tend to be changing with fitness and skill of the subjects. But, do stable subject characteristic parameters in walking exist? Does the Limit-Cycle-Attractor qualify as such a parameter?. RESEARCH QUESTION: The attractor method is a new approach focusing on the dynamics of human motion. It classifies the fundamental walking pattern by calculating the Limit-Cycle-Attractor and its variability from acceleration data of the feet...
May 16, 2018: Gait & Posture
https://www.readbyqxmd.com/read/29778063/comparison-of-three-dimensional-multi-segmental-foot-models-used-in-clinical-gait-laboratories
#16
Kristen Nicholson, Chris Church, Colton Takata, Tim Niiler, Brian Po-Jung Chen, Nancy Lennon, Julie P Sees, John Henley, Freeman Miller
BACKGROUND: Many skin-mounted three-dimensional multi-segmented foot models are currently in use for gait analysis. Evidence regarding the repeatability of models, including between trial and between assessors, is mixed, and there are no between model comparisons of kinematic results. RESEARCH QUESTION: This study explores differences in kinematics and repeatability between five three-dimensional multi-segmented foot models. The five models include duPont, Heidelberg, Oxford Child, Leardini, and Utah...
May 16, 2018: Gait & Posture
https://www.readbyqxmd.com/read/29777676/cognitive-effects-of-rhythmic-auditory-stimulation-in-parkinson-s-disease-a-p300-study
#17
Juan Lei, Nadine Conradi, Cornelius Abel, Stefan Frisch, Alla Brodski-Guerniero, Marcel Hildner, Christian A Kell, Jochen Kaiser, Maren Schmidt-Kassow
Rhythmic auditory stimulation (RAS) may compensate dysfunctions of the basal ganglia (BG), involved with intrinsic evaluation of temporal intervals and action initiation or continuation. In the cognitive domain, RAS containing periodically presented tones facilitates young healthy participants' attention allocation to anticipated time points, indicated by better performance and larger P300 amplitudes to periodic compared to random stimuli. Additionally, active auditory-motor synchronization (AMS) leads to a more precise temporal encoding of stimuli via embodied timing encoding than stimulus presentation adapted to the participants' actual movements...
May 16, 2018: Brain Research
https://www.readbyqxmd.com/read/29777527/limiting-motor-skill-knowledge-via-incidental-training-protects-against-choking-under-pressure
#18
Taraz G Lee, Daniel E Acuña, Konrad P Kording, Scott T Grafton
The paradoxical harmful effects of motivation and incentives on skilled performance ("choking under pressure") are observed in a wide variety of motor tasks. Two theories of this phenomenon suggest that choking under pressure occurs due to maladaptive attention and top-down control, either through distraction away from the task or interference via an overreliance on controlled processing of a skilled task. A third theory, overmotivation (or overarousal), suggests that under pressure, "instinctive" or Pavlovian approach/withdrawal responses compete with the desired response...
May 18, 2018: Psychonomic Bulletin & Review
https://www.readbyqxmd.com/read/29777506/an-extended-kalman-filter-for-mouse-tracking
#19
Hongjun Choi, Mingi Kim, Onseok Lee
Animal tracking is an important tool for observing behavior, which is useful in various research areas. Animal specimens can be tracked using dynamic models and observation models that require several types of data. Tracking mouse has several barriers due to the physical characteristics of the mouse, their unpredictable movement, and cluttered environments. Therefore, we propose a reliable method that uses a detection stage and a tracking stage to successfully track mouse. The detection stage detects the surface area of the mouse skin, and the tracking stage implements an extended Kalman filter to estimate the state variables of a nonlinear model...
May 19, 2018: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/29773999/fitts-law-in-the-control-of-isometric-grip-force-with-naturalistic-targets
#20
Zachary C Thumser, Andrew B Slifkin, Dylan T Beckler, Paul D Marasco
Fitts' law models the relationship between amplitude, precision, and speed of rapid movements. It is widely used to quantify performance in pointing tasks, study human-computer interaction, and generally to understand perceptual-motor information processes, including research to model performance in isometric force production tasks. Applying Fitts' law to an isometric grip force task would allow for quantifying grasp performance in rehabilitative medicine and may aid research on prosthetic control and design...
2018: Frontiers in Psychology
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