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https://www.readbyqxmd.com/read/28328716/vertical-jump-and-leg-power-normative-data-for-colombian-schoolchildren-aged-9-17-9-years-the-fuprecol-study
#1
Robinson Ramírez-Vélez, Jorge E Correa-Bautista, Felipe Lobelo, Eduardo L Cadore, Alicia M Alonso-Martinez, Mikel Izquierdo
Ramírez-Vélez, R, Correa-Bautista, JE, Lobelo, F, Cadore, EL, Alonso-Martinez, AM, and Izquierdo, M. Vertical jump and leg power normative data for Colombian schoolchildren aged 9-17.9 years: the FUPRECOL study. J Strength Cond Res 31(4): 990-998, 2017-The aims of the present study were to generate normative vertical jump height and predicted peak power (Ppeak) data for 9- to 17.9-year-olds and to investigate between-sex and age group differences in these measures. This was a cross-sectional study of 7,614 healthy schoolchildren (boys n = 3,258 and girls n = 4,356, mean [SD] age 12...
April 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28322596/motor-imagery-during-action-observation-increases-eccentric-hamstring-force-an-acute-non-physical-intervention
#2
Matthew Scott, Stephen Taylor, Paul Chesterton, Stefan Vogt, Daniel Lloyd Eaves
PURPOSE: Rehabilitation professionals typically use motor imagery (MI) or action observation (AO) to increase physical strength for injury prevention and recovery. Here we compared hamstring force gains for MI during AO (AO + MI) against two pure MI training groups. MATERIALS AND METHODS: Over a 3-week intervention physically fit adults imagined Nordic hamstring exercises in both legs and synchronized this with a demonstration of the same action (AO + MI), or they purely imagined this action (pure MI), or imagined upper-limb actions (pure MI-control)...
March 21, 2017: Disability and Rehabilitation
https://www.readbyqxmd.com/read/28321898/a-generalized-mixture-model-applied-to-diabetes-incidence-data
#3
Daiane Aparecida Zuanetti, Luis Aparecido Milan
We present a generalization of the usual (independent) mixture model to accommodate a Markovian first-order mixing distribution. We propose the data-driven reversible jump, a Markov chain Monte Carlo (MCMC) procedure, for estimating the a posteriori probability for each model in a model selection procedure and estimating the corresponding parameters. Simulated datasets show excellent performance of the proposed method in the convergence, model selection, and precision of parameters estimates. Finally, we apply the proposed method to analyze USA diabetes incidence datasets...
March 21, 2017: Biometrical Journal. Biometrische Zeitschrift
https://www.readbyqxmd.com/read/28320371/possible-factors-influencing-the-duration-of-hospital-stay-in-patients-with-psychiatric-disorders-attempting-suicide-by-jumping
#4
Tsubasa Omi, Hiroshi Ito, Keisen Riku, Koji Kanai, Hiromune Takada, Satoshi Fujimi, Hidenori Matsunaga, Kazutaka Ohi
BACKGROUND: Patients with psychiatric disorders have a high rate of suicide. The present study investigated factors influencing hospital stays for Japanese patients with psychiatric disorders attempting suicide by jumping. METHODS: We diagnosed all suicide attempts (n = 113) by jumping based on the International Classification of Diseases 10th Revision (ICD-10) and investigated the mean hospital stays of patients with each diagnosis based on the ICD-10 code. We then analyzed differences in the demographic and clinical characteristics between the diagnostic groups to identify factors influencing the duration of hospital stay...
March 20, 2017: BMC Psychiatry
https://www.readbyqxmd.com/read/28303248/fitness-effects-of-10-month-frequent-low-volume-ball-game-training-or-interval-running-for-8-10-year-old-school-children
#5
Malte Nejst Larsen, Claus Malta Nielsen, Christina Ørntoft, Morten Bredsgaard Randers, Eva Wulff Helge, Mads Madsen, Vibeke Manniche, Lone Hansen, Peter Riis Hansen, Jens Bangsbo, Peter Krustrup
We investigated the exercise intensity and fitness effects of frequent school-based low-volume high-intensity training for 10 months in 8-10-year-old children. 239 Danish 3rd-grade school children from four schools were cluster-randomised into a control group (CON, n = 116) or two training groups performing either 5 × 12 min/wk small-sided football plus other ball games (SSG, n = 62) or interval running (IR, n = 61). Whole-body DXA scans, flamingo balance, standing long-jump, 20 m sprint, and Yo-Yo IR1 children's tests (YYIR1C) were performed before and after the intervention...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28301929/cage-size-and-jump-precursors-in-glass-forming-liquids-experiment-and-simulations
#6
Raffaele Pastore, Giuseppe Pesce, Antonio Sasso, Massimo Pica Ciamarra
Glassy dynamics is intermittent, as particles suddenly jump out of the cage formed by their neighbours, and heterogeneous, as these jumps are not uniformly distributed across the system. Relating these features of the dynamics to the diverse local environments explored by the particles is essential to rationalize the relaxation process. Here we investigate this issue characterizing the local environment of a particle with the amplitude of its short time vibrational motion, as determined by segmenting in cages and jumps the particle trajectories...
March 16, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28297964/mixed-order-phase-transition-in-a-two-step-contagion-model-with-a-single-infectious-seed
#7
Wonjun Choi, Deokjae Lee, B Kahng
Percolation is known as one of the most robust continuous transitions, because its occupation rule is intrinsically local. As one of the ways to break the robustness, occupation is allowed to more than one species of particles and they occupy cooperatively. This generalized percolation model undergoes a discontinuous transition. Here we investigate an epidemic model with two contagion steps and characterize its phase transition analytically and numerically. We find that even though the order parameter jumps at a transition point r_{c}, then increases continuously, it does not exhibit any critical behavior: the fluctuations of the order parameter do not diverge at r_{c}...
February 2017: Physical Review. E
https://www.readbyqxmd.com/read/28297936/mean-field-avalanches-in-jammed-spheres
#8
S Franz, S Spigler
Disordered systems are characterized by the existence of many sample-dependent local-energy minima that cause a step-wise response when the system is perturbed. In this article we use an approach based on elementary probabilistic methods to compute the complete probability distribution of the jumps (static avalanches) in the response of mean-field systems described by replica symmetry breaking; we find a precise condition for having a power-law behavior in the distribution of avalanches caused by small perturbations, and we show that our predictions are in remarkable agreement both with previous results and with what is found in simulations of three-dimensional systems of soft spheres, either at jamming or at slightly higher densities...
February 2017: Physical Review. E
https://www.readbyqxmd.com/read/28297924/onset-of-anomalous-diffusion-from-local-motion-rules
#9
Sarah de Nigris, Timoteo Carletti, Renaud Lambiotte
Anomalous diffusion processes, in particular superdiffusive ones, are known to be efficient strategies for searching and navigation in animals and also in human mobility. One way to create such regimes are Lévy flights, where the walkers are allowed to perform jumps, the "flights," that can eventually be very long as their length distribution is asymptotically power-law distributed. In our work, we present a model in which walkers are allowed to perform, on a one-dimensional lattice, "cascades" of n unitary steps instead of one jump of a randomly generated length, as in the Lévy case, where n is drawn from a cascade distribution p_{n}...
February 2017: Physical Review. E
https://www.readbyqxmd.com/read/28281348/giant-exchange-coupling-evidenced-with-a-magnetization-jump-at-52-t-for-a-gadolinium-nitroxide-chelate
#10
Takuya Kanetomo, Takumi Kihara, Atsushi Miyake, Akira Matsuo, Masashi Tokunaga, Koichi Kindo, Hiroyuki Nojiri, Takayuki Ishida
The Gd-radical complex [Gd(III)(hfac)3(6bpyNO)] (6bpyNO = 2,2'-bipyridin-6-yl tert-butyl nitroxide; Hhfac = 1,1,1,5,5,5-hexafluoropentane-2,4-dione) showed a magnetization jump at 52 T observed in a pulsed-field facility, corresponding to an exchange coupling constant of -17.4 K. Furthermore, hysteretic behavior due to a relatively slow magnetization reversal was recorded around 2 T. From the high-frequency EPR study, the exchange coupling between Gd and radical spins accompanies an anisotropic character, which is responsible for both the broad jump and the slow magnetization reversal...
March 10, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28277733/a-new-paradigm-to-measure-probabilistic-reasoning-and-a-possible-answer-to-the-question-why-psychosis-prone-individuals-jump-to-conclusions
#11
Steffen Moritz, Anja S Göritz, Ryan P Balzan, Łukasz Gawęda, Susan C Kulagin, Christina Andreou
Jumping to conclusions (JTC) distinguishes patients with schizophrenia from both healthy and psychiatric controls. JTC is typically assessed using the beads task, which, however, faces a number of limitations as to its interpretability and reliability. The present study set out to validate a new paradigm to assess JTC: the box task. We adopted a psychometric psychosis proneness approach and divided a large population sample into participants who scored high versus low on a scale tapping psychosis-like experiences...
March 9, 2017: Journal of Abnormal Psychology
https://www.readbyqxmd.com/read/28275003/inverse-dynamic-modelling-of-jumping-in-the-red-legged-running-frog-kassina-maculata
#12
Laura B Porro, Amber J Collings, Enrico A Eberhard, Kyle P Chadwick, Christopher T Richards
Although the red-legged running frog Kassina maculata is secondarily a walker/runner, it retains the capacity for multiple locomotor modes, including jumping at a wide range of angles (nearly 70°). Using simultaneous hind limb kinematics and single-foot ground reaction forces, we performed inverse dynamics analyses to calculate moment arms and torques about the hind limb joints during jumping at different angles in K. maculata. We show that forward thrust is generated primarily at the hip and ankle, while body elevation is primarily driven by the ankle...
March 8, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28270816/size-matters-a-lot-drought-affected-italian-oaks-are-smaller-and-show-lower-growth-prior-to-tree-death
#13
Michele Colangelo, Jesús J Camarero, Marco Borghetti, Antonio Gazol, Tiziana Gentilesca, Francesco Ripullone
Hydraulic theory suggests that tall trees are at greater risk of drought-triggered death caused by hydraulic failure than small trees. In addition the drop in growth, observed in several tree species prior to death, is often interpreted as an early-warning signal of impending death. We test these hypotheses by comparing size, growth, and wood-anatomy patterns of living and now-dead trees in two Italian oak forests showing recent mortality episodes. The mortality probability of trees is modeled as a function of recent growth and tree size...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28270619/massive-increase-in-visual-range-preceded-the-origin-of-terrestrial-vertebrates
#14
Malcolm A MacIver, Lars Schmitz, Ugurcan Mugan, Todd D Murphey, Curtis D Mobley
The evolution of terrestrial vertebrates, starting around 385 million years ago, is an iconic moment in evolution that brings to mind images of fish transforming into four-legged animals. Here, we show that this radical change in body shape was preceded by an equally dramatic change in sensory abilities akin to transitioning from seeing over short distances in a dense fog to seeing over long distances on a clear day. Measurements of eye sockets and simulations of their evolution show that eyes nearly tripled in size just before vertebrates began living on land...
March 7, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28265090/deactivation-kinetics-of-acid-sensing-ion-channel-1a-are-strongly-ph-sensitive
#15
David M MacLean, Vasanthi Jayaraman
Acid-sensing ion channels (ASICs) are trimeric cation-selective ion channels activated by protons in the physiological range. Recent reports have revealed that postsynaptically localized ASICs contribute to the excitatory postsynaptic current by responding to the transient acidification of the synaptic cleft that accompanies neurotransmission. In response to such brief acidic transients, both recombinant and native ASICs show extremely rapid deactivation in outside-out patches when jumping from a pH 5 stimulus to a single resting pH of 8...
March 6, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28263394/conditioning-hops-increase-triceps-surae-muscle-force-and-achilles-tendon-strain-energy-in-the-stretch-shortening-cycle
#16
Jakob Kümmel, Neil J Cronin, Andreas Kramer, Janne Avela, Markus Gruber
Post-activation potentiation can improve athletic performance, but the underlying mechanisms are poorly understood. This study investigated the effect of conditioning hops on triceps surae muscle force and tendon strain and its contribution to potentiated stretch-shortening cycle (SSC) performance. Thirty-two subjects participated in two experiments. In both experiments, subjects performed three drop jumps (DJs) after prior conditioning with 10 maximal hops, three unconditioned DJs served as control. Ground reaction forces, kinematics, and triceps surae electromyographic activity were recorded...
March 6, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28257100/an-adaptive-damping-network-designed-for-strapdown-fiber-optic-gyrocompass-system-for-ships
#17
Jin Sun, Xiaosu Xu, Yiting Liu, Tao Zhang, Yao Li, Jinwu Tong
The strapdown fiber optic gyrocompass (strapdown FOGC) system for ships primarily works on external horizontal damping and undamping statuses. When there are large sea condition changes, the system will switch frequently between the external horizontal damping status and the undamping status. This means that the system is always in an adjustment status and influences the dynamic accuracy of the system. Aiming at the limitations of the conventional damping method, a new design idea is proposed, where the adaptive control method is used to design the horizontal damping network of the strapdown FOGC system...
March 2, 2017: Sensors
https://www.readbyqxmd.com/read/28256848/localization-in-open-quantum-systems
#18
I Yusipov, T Laptyeva, S Denisov, M Ivanchenko
In an isolated single-particle quantum system, a spatial disorder can induce Anderson localization. Being a result of interference, this phenomenon is expected to be fragile in the face of dissipation. Here we show that a proper dissipation can drive a disordered system into a steady state with tunable localization properties. This can be achieved with a set of identical dissipative operators, each one acting nontrivially on a pair of sites. Operators are parametrized by a uniform phase, which controls the selection of Anderson modes contributing to the state...
February 17, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28253355/a-neuropeptide-modulates-sensory-perception-in-the-entomopathogenic-nematode-steinernema-carpocapsae
#19
Robert Morris, Leonie Wilson, Matthew Sturrock, Neil D Warnock, Daniel Carrizo, Deborah Cox, Aaron G Maule, Johnathan J Dalzell
Entomopathogenic nematodes (EPNs) employ a sophisticated chemosensory apparatus to detect potential hosts. Understanding the molecular basis of relevant host-finding behaviours could facilitate improved EPN biocontrol approaches, and could lend insight to similar behaviours in economically important mammalian parasites. FMRFamide-like peptides are enriched and conserved across the Phylum Nematoda, and have been linked with motor and sensory function, including dispersal and aggregating behaviours in the free living nematode Caenorhabditis elegans...
March 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28253065/effects-of-taping-on-achilles-tendon-protection-and-kendo-performance
#20
Feng-Hua Tsai, I-Hua Chu, Chun-Hao Huang, Jing-Min Liang, Jia-Hroung Wu, Wen-Lan Wu
CONTEXT: It has been reported that there is high rate of Achilles tendon injury among kendo athletes. For protection and support the area, kendo athletes habitually use taping during practice or games. OBJECTIVE: To investigate the effect of various taping techniques on injury prevention and functional performance in kendo athletes. DESIGN: Case-control study. SETTING: Laboratory. PARTICIPANTS: Fifteen University Kendo Team athletes with at least 2 years kendo experience...
March 2, 2017: Journal of Sport Rehabilitation
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