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https://www.readbyqxmd.com/read/29350296/use-of-biotechnological-devices-in-the-quantification-of-psychophysiological-workload-of-professional-chess-players
#1
Juan P Fuentes, Santos Villafaina, Daniel Collado-Mateo, Ricardo de la Vega, Narcis Gusi, Vicente Javier Clemente-Suárez
Psychophysiological requirements of chess players are poorly understood, and periodization of training is often made without any empirical basis. For this reason, the aim of the present study was to investigate the psychophysiological response and quantify the player internal load during, and after playing a chess game. The participant was an elite 33 year-old male chess player ranked among the 300 best chess players in the world. Thus, cortical arousal by critical flicker fusion threshold, electroencephalogram by the theta Fz/alpha Pz ratio and autonomic modulation by heart rate variability were analyzed...
January 19, 2018: Journal of Medical Systems
https://www.readbyqxmd.com/read/29340001/neuromuscular-control-during-the-bench-press-movement-in-an-elite-disabled-and-able-bodied-athlete
#2
Artur Gołaś, Anna Zwierzchowska, Adam Maszczyk, Michał Wilk, Petr Stastny, Adam Zając
The disabled population varies significantly in regard to physical fitness, what is conditioned by the damage to the locomotor system. Recently there has been an increased emphasis on the role of competitive sport in enhancing health and the quality of life of individuals with disability. One of the sport disciplines of Paralympics is the flat bench press. The bench press is one of the most popular resistance exercises used for the upper body in healthy individuals. It is used not only by powerlifters, but also by athletes in most strength-speed oriented sport disciplines...
December 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/29339994/the-second-to-fourth-digit-ratio-in-elite-and-non-elite-greco-roman-wrestlers
#3
Mohammad Keshavarz, Mahdi Bayati, Babak Farzad, Amirbahador Dakhili, Hamid Agha-Alinejad
A low second-to-fourth digit ratio (2D:4D) has been reported to correlate with high performance and athletic potential of an individual in sport. It has been suggested that 2D:4D is a relatively weak predictor of strength and a stronger predictor of efficiency in aerobic exercise. Comparing extreme groups on a continuum of sports performance requiring high power (physical strength) output would be helpful to resolve this issue. Therefore, the purpose of the present study was to compare the 2D:4D ratio of world-class elite Greco-Roman wrestlers (n = 10) taking part in Olympic fitness camps in 2013 with the 2D:4D ratio of non-elite collegiate wrestlers (n = 20), and age-matched sedentary males (n = 40)...
December 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/29338738/rapid-hiv-disease-progression-following-superinfection-in-an-hla-b-27-05-b-57-01-positive-transmission-recipient
#4
Jacqui Brener, Astrid Gall, Jacob Hurst, Rebecca Batorsky, Nora Lavandier, Fabian Chen, Anne Edwards, Chrissy Bolton, Reena Dsouza, Todd Allen, Oliver G Pybus, Paul Kellam, Philippa C Matthews, Philip J R Goulder
BACKGROUND: The factors determining differential HIV disease outcome among individuals expressing protective HLA alleles such as HLA-B*27:05 and HLA-B*57:01 remain unknown. We here analyse two HIV-infected subjects expressing both HLA-B*27:05 and HLA-B*57:01. One subject maintained low-to-undetectable viral loads for more than a decade of follow up. The other progressed to AIDS in < 3 years. RESULTS: The rapid progressor was the recipient within a known transmission pair, enabling virus sequences to be tracked from transmission...
January 16, 2018: Retrovirology
https://www.readbyqxmd.com/read/29334309/effects-of-resisted-sprint-training-on-sprinting-ability-and-change-of-direction-speed-in-professional-soccer-players
#5
Saulo Gil, Renato Barroso, Everton Crivoi do Carmo, Irineu Loturco, Ronaldo Kobal, Valmor Tricoli, Carlos Ugrinowitsch, Hamilton Roschel
Resisted sprint training consists of performing overloaded sprints, which may produce greater effects than traditional sprint training. We compared a resisted sprint training with overload control versus an unresisted sprint training program on performance in soccer players. Eighteen elite athletes were randomly assigned to resisted (RST) or unresisted sprint training protocol (UR). Before and after a 6-week training period, sprinting ability, change of direction speed (COD), vertical jumps (SJ and CMJ), mean power (MP) and mean propulsive power (MPP) at distinct loads were assessed...
January 15, 2018: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29333092/role-of-apobec3h-in-the-viral-control-of-hiv-elite-controller-patients
#6
José M Benito, Julia Hillung, Clara Restrepo, José M Cuevas, Agathe León, Ezequiel Ruiz-Mateos, Rosario Palacios-Muñoz, Miguel Górgolas, Rafael Sanjuán, Norma Rallón
Background APOBEC3H (A3H) gene presents variation at 2 positions (rs139297 and rs79323350) leading to a non-functional protein. So far, there is no information on the role played by A3H in spontaneous control of HIV. The aim of this study was to evaluate the A3H polymorphisms distribution in a well-characterized group of Elite Controller (EC) subjects. Methods We analyzed the genotype distribution of two different SNPs (rs139297 and rs79323350) of A3H in 30 EC patients and compared with 11 non-controller (NC) HIV patients...
2018: International Journal of Medical Sciences
https://www.readbyqxmd.com/read/29332730/biomechanical-factors-associated-with-running-economy-and-performance-of-elite-kenyan-distance-runners-a-systematic-review
#7
REVIEW
Nassib Tawa, Quinette Louw
BACKGROUND: Running economy (RE) is a determinant of performance in endurance sports and is a complex multi-factorial measure which reflects the combined functioning of bio-mechanical, neuro-muscular, metabolic and cardio-respiratory factors some of which are hereditary or adapt to coaching. Kenyan distance runners have dominated major global events with their unmatched performance for decades and this phenomenon has prompted several investigations aimed at establishing possible factors associated with their performance...
January 2018: Journal of Bodywork and Movement Therapies
https://www.readbyqxmd.com/read/29330669/hip-and-groin-injuries-in-baseball-players
#8
REVIEW
Ryan A Mlynarek, Struan H Coleman
PURPOSE OF REVIEW: To discuss the clinical significance of the most common hip and groin injuries in baseball players, as well as an algorithmic approach to diagnosis and treatment of these injuries. RECENT FINDINGS: (a) Limitations in throwing velocity, pitch control, and bat swing speed may be secondary to decreased mobility and strength within the proximal kinetic chain, which must harness power from the lower extremities and core. (b) Approximately 5.5% of all baseball injuries per year involve the hip/groin and may lead to a significant amount of time spent on the disabled list...
January 12, 2018: Current Reviews in Musculoskeletal Medicine
https://www.readbyqxmd.com/read/29327824/are-there-bilateral-isokinetic-shoulder-rotator-differences-in-basketball-male-players
#9
Thierry Weissland, Maryne Cozette, Clare Doyle, Antoine Gabrion
BACKGROUND: The internal (IR) and external (ER) rotator shoulder strength are often assess in the upper limb sports to prevent a risk of injuries. The purpose of this comparative study was to measure the agonist/antagonist balance of shoulder strength and to determine whether significant differences exist between the dominant and nondominant sides in basketball players compared to a control groups. METHODS: During the championship, 23 elite male-basketball players (BB) and 23 healthy males (CG) were tested bilaterally on a Cybex Norm isokinetic dynamometer in a seated position with 45° shoulder abduction in the scapular plane at 60°...
January 10, 2018: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/29327170/the-effects-of-a-single-session-of-spinal-manipulation-on-strength-and-cortical-drive-in-athletes
#10
Thomas Lykke Christiansen, Imran Khan Niazi, Kelly Holt, Rasmus Wiberg Nedergaard, Jens Duehr, Kathryn Allen, Paul Marshall, Kemal S Türker, Jan Hartvigsen, Heidi Haavik
PURPOSE: The primary purpose of this study was to investigate whether a single session of spinal manipulation (SM) increases strength and cortical drive in the lower limb (soleus muscle) of elite Taekwondo athletes. METHODS: Soleus-evoked V-waves, H-reflex and maximum voluntary contraction (MVC) of the plantar flexors were recorded from 11 elite Taekwondo athletes using a randomized controlled crossover design. Interventions were either SM or passive movement control...
January 11, 2018: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/29326958/performance-and-return-to-sport-after-thumb-ulnar-collateral-ligament-repair-in-major-league-baseball-players
#11
Robert A Jack, Kyle R Sochacki, Bryce Gagliano, David M Lintner, Joshua D Harris, Patrick C McCulloch
Background: Acute ruptures of the ulnar collateral ligament (UCL) of the thumb are common injuries in sports. Surgical repair has yielded excellent results and high return-to-sport (RTS) rates in elite athletes. Purpose: To determine (1) the RTS rate in Major League Baseball (MLB) players following thumb UCL repair, (2) postoperative career length and games played per season, (3) pre- and postoperative performance, (4) postoperative performance compared with matched control players, and (5) whether dominant and nondominant hand injuries respond differently...
January 2018: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/29321647/molecular-marker-assisted-breeding-and-genome-composition-analysis-of-zhengmai-7698-an-elite-winter-wheat-cultivar
#12
Chun-Xin Li, Wei-Gang Xu, Rui Guo, Jian-Zhou Zhang, Xue-Li Qi, Lin Hu, Ming-Zhong Zhao
Zhengmai 7698 is an elite winter wheat variety widely cultivated in the Southern regions of the Yellow-Huai River Valley of China. Here, we report the molecular markers used for breeding Zhengmai 7698 and the genome composition of this cultivar revealed using genome-wide SNPs. A total of 26 DNA markers derived from the genes controlling gluten protein quality, grain hardness, flour color, disease resistance, or pre-harvesting sprouting resistance were used during breeding. Consequently, Zhengmai 7698 had strong gluten, high grain hardness index, white flour color, and high levels of resistance to powdery mildew, stripe rust infections, and pre-harvesting sprouting...
January 10, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29310525/proactive-and-reactive-motor-inhibition-in-top-athletes-versus-nonathletes
#13
Damien Brevers, Etienne Dubuisson, Fabien Dejonghe, Julien Dutrieux, Mathieu Petieau, Guy Cheron, Paul Verbanck, Jennifer Foucart
We examined proactive (early restraint in preparation for stopping) and reactive (late correction to stop ongoing action) motor response inhibition in two groups of participants: professional athletes ( n = 28) and nonathletes ( n = 25). We recruited the elite athletes from Belgian national taekwondo and fencing teams. We estimated proactive and reactive inhibition with a modified version of the stop-signal task (SST) in which participants inhibited categorizing left/right arrows. The probability of the stop signal was manipulated across blocks of trials by providing probability cues from the background computer screen color (green = 0%, yellow =17%, orange = 25%, red = 33%)...
January 1, 2018: Perceptual and Motor Skills
https://www.readbyqxmd.com/read/29301377/identification-and-comparative-analysis-of-premature-senescence-leaf-mutants-in-rice-oryza-sativa-l
#14
Yan He, Liangjian Li, Zhihong Zhang, Jian-Li Wu
Premature leaf senescence negatively impacts the grain yield in the important monocot rice (Oryza sativa L.); to understand the molecular mechanism we carried out a screen for mutants with premature senescence leaves in a mutant bank generated by ethyl methane sulfonate (EMS) mutagenesis of elite indica rice ZhongJian100. Five premature senescence leaf (psl15, psl50, psl89, psl117 and psl270) mutants were identified with distinct yellowish phenotypes on leaves starting from the tillering stage to final maturation...
January 3, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29298333/genetic-dissection-of-qtls-and-differentiation-analysis-of-alleles-for-heading-date-genes-in-rice
#15
Hua Zhang, Shuyi Liu, Gao Chen, Xu Liu, Ning Xuan, Yongyi Yang, Wei Liu, Hanfeng Ding, Fangyin Yao
Heading date is an important agronomic trait in rice (Oryza sativa L.); it determines the geographical and seasonal adaptability of the crop. Single segment substitution lines (SSSLs) have become the preferred experimental materials in mapping functional genetic variations as the particular chromosome segments from donor genotypes can be evaluated for their impact on the phenotype in a recurrent recipient background. The phenotypic differences can be attributed to the control of quantitative trait loci (QTLs)...
2018: PloS One
https://www.readbyqxmd.com/read/29273355/what-is-the-most-important-for-elite-control-genetic-background-of-patient-genetic-background-of-partner-both-or-neither-description-of-complete-natural-history-within-a-couple-of-msm
#16
M Bendenoun, A Samri, V Avettand-Fènoël, S Cardinaud, B Descours, G Carcelain, M-C Mazeron, J-F Bergmann, A Urrutia, A Moris, C Rouzioux, F Simon, P Andre, M Pocard, X Dray, T Mourez, V Vieillard, B Autran, F Barin, P Sellier
BACKGROUND: We describe a homosexual man who strongly controlled HIV-1 for ten years despite lack of protective genetic background. METHODS: HIV-1 DNA was measured in blood and other tissues. Cell susceptibility was evaluated with various strains. HIV-1-specific (CD4 and CD8 activation markers and immune check points) and NK cells responses were assessed; KIRs haplotypes and HLA alleles were determined. FINDINGS: Two HIV-1 RNA copies/mL of plasma were detected in 2009, using an ultra-sensitive assay...
December 7, 2017: EBioMedicine
https://www.readbyqxmd.com/read/29259393/the-retina-rpe-proteome-in-chick-myopia-and-hyperopia-models-commonalities-with-inherited-and-age-related-ocular-pathologies
#17
Nina Riddell, Pierre Faou, Melanie Murphy, Loretta Giummarra, Rachael A Downs, Harinda Rajapaksha, Sheila G Crewther
Purpose: Microarray and RNA sequencing studies in the chick model of early optically induced refractive error have implicated thousands of genes, many of which have also been linked to ocular pathologies in humans, including age-related macular degeneration (AMD), choroidal neovascularization, glaucoma, and cataract. These findings highlight the potential relevance of the chick model to understanding both refractive error development and the progression to secondary pathological complications...
2017: Molecular Vision
https://www.readbyqxmd.com/read/29240004/synchronizing-gait-with-cardiac-cycle-phase-alters-heart-rate-response-during-running
#18
Keren Constantini, Abigail S L Stickford, Jeffery L Bleich, Paul D Mannheimer, Benjamin D Levine, Robert F Chapman
Timing foot strike to occur in synchrony with cardiac diastole may reduce left ventricular afterload and promote coronary and skeletal muscle perfusion. PURPOSE: To assess heart rate (HR) and metabolic responses to running when foot strikes are timed to occur exclusively during 1) the systolic phase of the cardiac cycle, or 2) the diastolic phase. METHODS: Ten elite male distance runners performed a testing session on a treadmill at 4.72 m[BULLET OPERATOR]s while matching their steps to an auditory tone and wearing a chest strap that transmitted accelerometer and ECG signals...
December 12, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/29239994/effects-of-judo-training-on-bones-a-systematic-literature-review
#19
Simone Ciaccioni, Giancarlo Condello, Flavia Guidotti, Laura Capranica
The aim of this study was to provide a systematic literature review on the osteogenic effects of judo (PROSPERO: CRD42016041803). The online search was conducted according to the inclusion criteria: observational studies and clinical/interventional trials in English from inception to June 2016; bone health, mineral density (BMD), diameters, impact force and turnover markers (BTM) outcomes. Thirty-four studies were included and graded for their methodological quality ("fair" quality: 79.4%). The most used assessment method (44...
December 11, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29239030/neuromuscular-training-reduces-lower-limb-injuries-in-elite-female-basketball-players-a-cluster-randomized-controlled-trial
#20
M Bonato, R Benis, A La Torre
The study was a two-armed, parallel group, cluster randomized controlled trial in which 15 teams (160 players) were assigned to either an experimental group (EG, 8 teams n = 86), which warmed-up with bodyweight neuromuscular exercises, or a control group (CG, 7 teams, n = 74) that performed standard tactical-technical exercises before training. All injuries during the 2015-2016 regular season were counted. Epidemiologic incidence proportion and incidence rate were also calculated. Countermovement jump (CMJ) and composite Y-Excursion Balance test (YBT) were used to assess lower limb strength and postural control...
December 14, 2017: Scandinavian Journal of Medicine & Science in Sports
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