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human movement analysis

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https://www.readbyqxmd.com/read/29467602/feature-selection-methods-for-robust-decoding-of-finger-movements-in-a-non-human-primate
#1
Subash Padmanaban, Justin Baker, Bradley Greger
Objective: The performance of machine learning algorithms used for neural decoding of dexterous tasks may be impeded due to problems arising when dealing with high-dimensional data. The objective of feature selection algorithms is to choose a near-optimal subset of features from the original feature space to improve the performance of the decoding algorithm. The aim of our study was to compare the effects of four feature selection techniques, Wilcoxon signed-rank test, Relative Importance, Principal Component Analysis (PCA), and Mutual Information Maximization on SVM classification performance for a dexterous decoding task...
2018: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/29454839/monitoring-the-extent-of-vertical-and-lateral-movement-of-human-decomposition-products-through-sediment-using-cholesterol-as-a-biomarker
#2
Susan Luong, Shari L Forbes, James F Wallman, Richard G Roberts
Due to the lack of human decomposition research facilities available in different geographical regions, the extent of movement of human decomposition products from a cadaver into various sedimentary environments, in different climates, has not been able to be studied in detail. In our study, a human cadaver was placed on the surface of a designated plot at the Australian Facility for Taphonomic Experimental Research (AFTER), the only human decomposition facility in Australia, where the natural process of decomposition was allowed to progress over 14days in the Australian summer...
February 6, 2018: Forensic Science International
https://www.readbyqxmd.com/read/29450763/effects-of-915-nm-laser-irradiation-on-human-osteoblasts-a-preliminary-in-vitro-study
#3
Giovanni Mergoni, Paolo Vescovi, Silvana Belletti, Jacopo Uggeri, Samir Nammour, Rita Gatti
Photobiomodulation (PBM) is a non-invasive treatment that uses laser or led devices making its effects a response to light and not to heat. The possibility of accelerating dental implant osteointegration and orthodontic movements and the need to treat refractory bone lesions, such as bisphosphonate related osteonecrosis of the jaws, has led researchers to consider the effects of PBM on bone for dentistry purposes. The aim of our study was to investigate the effects of 915 nm light supplied with a GaAs diode laser on human osteoblasts in vitro...
February 15, 2018: Lasers in Medical Science
https://www.readbyqxmd.com/read/29449194/prostaglandin-d2-receptor-dp1-antibodies-predict-vaccine-induced-and-spontaneous-narcolepsy-type-1-large-scale-study-of-antibody-profiling
#4
Helle Sadam, Arno Pihlak, Anri Kivil, Susan Pihelgas, Mariliis Jaago, Priit Adler, Jaak Vilo, Olli Vapalahti, Toomas Neuman, Dan Lindholm, Markku Partinen, Antti Vaheri, Kaia Palm
BACKGROUND: Neuropathological findings support an autoimmune etiology as an underlying factor for loss of orexin-producing neurons in spontaneous narcolepsy type 1 (narcolepsy with cataplexy; sNT1) as well as in Pandemrix influenza vaccine-induced narcolepsy type 1 (Pdmx-NT1). The precise molecular target or antigens for the immune response have, however, remained elusive. METHODS: Here we have performed a comprehensive antigenic repertoire analysis of sera using the next-generation phage display method - mimotope variation analysis (MVA)...
February 2, 2018: EBioMedicine
https://www.readbyqxmd.com/read/29444738/the-influence-of-traffic-area-location-and-other-factors-on-operating-room-microbial-load
#5
Kevin Taaffe, Brandon Lee, Yann Ferrand, Lawrence Fredendall, Dee San, Cassandra Salgado, Dotan Shvorin, Amin Khoshkenar, Scott Reeves
OBJECTIVE To determine how the movement of patients, equipment, materials, staff, and door openings within the operating room (OR) affect microbial loads at various locations within the OR. DESIGN Observation and sampling study. SETTING Academic health center, public hospital. METHODS We first analyzed 27 videotaped procedures to determine the areas in the OR with high and low numbers of people in transit. We then placed air samplers and settle plates in representative locations during 21 procedures in 4 different ORs during 2 different seasons of the year to measure microbial load in colony-forming units (CFU)...
February 15, 2018: Infection Control and Hospital Epidemiology
https://www.readbyqxmd.com/read/29431559/the-effects-of-filter-cutoff-frequency-on-musculoskeletal-simulations-of-high-impact-movements
#6
Sebastian Tomescu, Ryan Bakker, Tyson A C Beach, Naveen Chandrashekar
Estimation of muscle forces through musculoskeletal simulation is important in understanding human movement and injury. Unmatched filter frequencies used to low-pass filter marker and force platform data can create artifacts during inverse dynamics analysis, but their effects on muscle force calculations are unknown. The objective of this study was to determine the effects of filter cutoff frequency on simulation parameters and magnitudes of lower extremity muscle and resultant joint contact forces during a high-impact maneuver...
February 12, 2018: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/29420437/objectively-differentiating-movement-patterns-between-elite-and-novice-athletes
#7
Gwyneth B Ross, Brittany Dowling, Nikolaus F Troje, Steven L Fischer, Ryan B Graham
INTRODUCTION: Movement screens are frequently used to identify abnormal movement patterns that may increase risk of injury or hinder performance. Abnormal patterns are often detected visually based on the observations of a coach or clinician. Quantitative, or data-driven methods can increase objectivity, remove issues related to inter-rater reliability and offer the potential to detect new and important features that may not be observable by the human eye. Applying principal components analysis (PCA) to whole-body motion data may provide an objective data-driven method to identify unique and statistically important movement patterns, an important first step to objectively characterize optimal patterns or identify abnormalities...
February 5, 2018: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/29409977/extending-the-analysis-of-zebrafish-behavioral-endophenotypes-for-modeling-psychiatric-disorders-fear-conditioning-to-conspecific-alarm-response
#8
Caio Maximino, Daniele L Meinerz, Barbara D Fontana, Nathana J Mezzomo, Flavia V Stefanello, Alessandro de S Prestes, Cibele B Batista, Maribel A Rubin, Nilda V Barbosa, João Batista T Rocha, Monica G Lima, Denis B Rosemberg
Anxiety, trauma- and stressor-related disorders are severe psychiatric conditions that affect human population worldwide. Given their genetic tractability, evolutionarily conserved neurotransmitter systems, and extensive behavioral repertoire, zebrafish have become an emergent model organism in translational neuroscience. Here, we investigate whether a single exposure to conspecific alarm substance (CAS) produces fear conditioning in zebrafish using a conditioned place aversion (CPA) paradigm, as well as the persistence of aversive responses at different time intervals...
February 2, 2018: Behavioural Processes
https://www.readbyqxmd.com/read/29404856/analysis-and-fem-simulation-methodology-of-dynamic-behavior-of-human-rotator-cuff-in-repetitive-routines-musician-case-study
#9
Manuel Islan, Fernando Blaya, Pilar San Pedro, Roberto D'Amato, Emilio Lechosa Urquijo, Juan Antonio Juanes
The majority of musculoskeletal injuries located in the shoulder are often due to repetitive or sustained movements that occur in work routines in different areas. In the case of musicians, such as violinists, who have long and daily training routines, the repetitive movements they perform are forced and sometimes the postures are not natural. Therefore, this article aims to study and simulate the dynamic behavior of the glenohumeral joint under repetitive conditions that represent the different postures assumed by a violinist during his daily training...
February 5, 2018: Journal of Medical Systems
https://www.readbyqxmd.com/read/29398001/a-computer-vision-based-method-for-3d-posture-estimation-of-symmetrical-lifting
#10
Rahil Mehrizi, Xi Peng, Xu Xu, Shaoting Zhang, Dimitris Metaxas, Kang Li
Work-related musculoskeletal disorders (WMSD) are commonly observed among the workers involved in material handling tasks such as lifting. To improve work place safety, it is necessary to assess musculoskeletal and biomechanical risk exposures associated with these tasks. Such an assessment has been mainly conducted using surface marker-based methods, which is time consuming and tedious. During the past decade, computer vision based pose estimation techniques have gained an increasing interest and may be a viable alternative for surface marker-based human movement analysis...
January 12, 2018: Journal of Biomechanics
https://www.readbyqxmd.com/read/29396499/movement-strategies-for-countermovement-jumping-are-potentially-influenced-by-elastic-energy-stored-and-released-from-tendons
#11
Logan Wade, Glen Lichtwark, Dominic James Farris
The preferred movement strategies that humans choose to produce work for movement are not fully understood. Previous studies have demonstrated an important contribution of elastic energy stored within the Achilles tendon (AT) during jumping. This study aimed to alter energy available for storage in the AT to examine changes in how jumpers distribute work among lower limb joints. Participants (n = 16) performed maximal and sub-maximal jumps under two paradigms, matched for increasing total work output by manipulating jump height or adding body mass...
February 2, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29393489/lysyl-oxidase-inhibition-via-%C3%AE-aminoproprionitrile-hampers-human-umbilical-vein-endothelial-cell-angiogenesis-and-migration-in%C3%A2-vitro
#12
Lin Shi, Ning Zhang, Hetao Liu, Lei Zhao, Jing Liu, Juan Wan, Wenyi Wu, Hetian Lei, Rongqing Liu, Mei Han
Lysyl oxidase (LOX) is an enzyme that oxidizes lysine residues in collagens and elastin. It stabilizes or remodels the extracellular matrix and basement membrane of blood vessels. Current oncology studies have revealed that LOX is upregulated in invasive cancer cells and bolstered cell movement, and LOX was observed to promote the angiogenesis and migration of endothelial cells. In the present study, angiogenesis and migration were examined in human umbilical vein endothelial cells (HUVECs). Following cell treatment with 0...
January 26, 2018: Molecular Medicine Reports
https://www.readbyqxmd.com/read/29387830/thymoquinone-as-a-natural-spermostatic-substance-in-reproductive-medicine-an-experimental-study
#13
Farhad Golshan Iranpour, Khatereh Fazelian, Gholam Reza Dashti
Background: Nonoxynol-9 a nonionic surfactant is widely used for its spermicidal effects. Finding new sperm immobilizing agents is necessary because Nonoxynol-9 damages the tissues of female reproductive system. Objective: The aim of this study was to evaluate the effects of Thymoquinone (TQ) as a potential spermostatic compound on the motility and viability of human spermatozoa. Materials and Methods: In this experimental study, the effects of 5, 10, 20, 50, 100 µg/ml, 1 and 10 mg/ml of TQ on normozoospermic semen samples were investigated...
October 2017: International Journal of Reproductive Biomedicine (Yazd, Iran)
https://www.readbyqxmd.com/read/29383565/an-across-target-study-on-visual-attentions-in-facial-expression-recognition
#14
Baomin Li, Fenglei Yang
As a simulation of human expression recognition, the studies on automatic expression recognition expect to draw useful enlightenment through close, accurate observation on human expression processing via advanced devices. Eye-trackers are mostly used devices that are technically designed to obtain eye-movement data. However, due to the discrepancy between target faces, across-target analysis is limited in these studies, and this much reduces the chance of finding the latent eye-behavior patterns. Through the utilization of correspondences between targets, this study achieves an across-target analysis to explore the attention pattern in expression recognition...
January 30, 2018: Interdisciplinary Sciences, Computational Life Sciences
https://www.readbyqxmd.com/read/29383399/influence-of-dual-task-constraints-on-the-interaction-between-posture-and-movement-during-a-lower-limb-pointing-task
#15
Marcelo Guimarães Silva, Lucas Struber, José Geraldo T Brandão, Olivier Daniel, Vincent Nougier
One of the challenges regarding human motor control is making the movement fluid and at a limited cognitive cost. The coordination between posture and movement is a necessary requirement to perform daily life tasks. The present experiment investigated this interaction in 20 adult men, aged 18-30 years. The cognitive costs associated to postural and movement control when kicking towards a target was estimated using a dual-task paradigm (secondary auditory task). Results showed that addition of the attentional demanding cognitive task yielded a decreased kicking accuracy and an increased timing to perform the movement, mainly during the backswing motion...
January 30, 2018: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/29383259/monitoring-of-atopic-dermatitis-using-leaky-coaxial-cable
#16
Binbin Dong, Aifeng Ren, Syed Aziz Shah, Fangming Hu, Nan Zhao, Xiaodong Yang, Daniyal Haider, Zhiya Zhang, Wei Zhao, Qammer Hussain Abbasi
In our daily life, inadvertent scratching may increase the severity of skin diseases (such as atopic dermatitis etc.). However, people rarely pay attention to this matter, so the known measurement behaviour of the movement is also very little. Nevertheless, the behaviour and frequency of scratching represent the degree of itching, and the analysis of scratching frequency is helpful to the doctor's clinical dosage. In this Letter, a novel system is proposed to monitor the scratching motion of a sleeping human body at night...
December 2017: Healthcare Technology Letters
https://www.readbyqxmd.com/read/29380374/hunger-mediates-apex-predator-s-risk-avoidance-response-in-wildland-urban-interface
#17
Kevin A Blecha, Randall B Boone, Mathew W Alldredge
1.Conflicts between large mammalian predators and humans present a challenge to conservation efforts, as these events drive human attitudes and policies concerning predator species. Unfortunately, generalities portrayed in many empirical carnivore landscape selection studies do not provide an explanation for a predator's occasional use of residential development preceding a carnivore-human conflict event. In some cases, predators may perceive residential development as a risk-reward tradeoff. 2.We examine whether state dependent mortality-risk sensitive foraging can explain an apex carnivore's (Puma concolor) occasional utilization of residential areas...
January 30, 2018: Journal of Animal Ecology
https://www.readbyqxmd.com/read/29379881/biallelic-chp1-mutation-causes-human-autosomal-recessive-ataxia-by-impairing-nhe1-function
#18
Natalia Mendoza-Ferreira, Marie Coutelier, Eva Janzen, Seyyedmohsen Hosseinibarkooie, Heiko Löhr, Svenja Schneider, Janine Milbradt, Mert Karakaya, Markus Riessland, Christian Pichlo, Laura Torres-Benito, Andrew Singleton, Stephan Zuchner, Alexis Brice, Alexandra Durr, Matthias Hammerschmidt, Giovanni Stevanin, Brunhilde Wirth
Objective: To ascertain the genetic and functional basis of complex autosomal recessive cerebellar ataxia (ARCA) presented by 2 siblings of a consanguineous family characterized by motor neuropathy, cerebellar atrophy, spastic paraparesis, intellectual disability, and slow ocular saccades. Methods: Combined whole-genome linkage analysis, whole-exome sequencing, and focused screening for identification of potential causative genes were performed. Assessment of the functional consequences of the mutation on protein function via subcellular fractionation, size-exclusion chromatography, and fluorescence microscopy were done...
February 2018: Neurology. Genetics
https://www.readbyqxmd.com/read/29373231/automatic-recognition-of-gait-patterns-in-human-motor-disorders-using-machine-learning-a-review
#19
REVIEW
Joana Figueiredo, Cristina P Santos, Juan C Moreno
BACKGROUND: automatic recognition of human movement is an effective strategy to assess abnormal gait patterns. Machine learning approaches are mainly applied due to their ability to work with multidimensional nonlinear features. PURPOSE: to compare several machine learning algorithms employed for gait pattern recognition in motor disorders using discriminant features extracted from gait dynamics. Additionally, this work highlights procedures that improve gait recognition performance...
January 17, 2018: Medical Engineering & Physics
https://www.readbyqxmd.com/read/29368117/beyond-v40-31-narrative-phenomenology-of-wandering-in-autism-and-dementia
#20
Olga Solomon, Mary C Lawlor
Research on autism spectrum disorder (ASD) and on Alzheimer's Disease (AD) and other types of dementia describes a behaviour called 'wandering', a term that denotes movement through space lacking intention or exact destination, as when a person is disoriented or not self-aware. In the U.S., 'wandering' in both ASD and AD has been examined mostly from a management and prevention perspective. It prioritizes safety while primarily overlooking personal experiences of those who 'wander' and their families, thus limiting the range of potentially effective strategies to address this issue...
January 24, 2018: Culture, Medicine and Psychiatry
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