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https://www.readbyqxmd.com/read/28338366/effects-of-bout-duration-on-players-internal-and-external-loads-during-small-sided-games-in-young-soccer-players
#1
Yusuf Köklü, Utku Alemdaroğlu, Hamit Cihan, Del P Wong
PURPOSE: This study investigated the effects of different bout durations on internal and external loads of young soccer players during different small-sided games (SSGs). METHOD: Fifteen male young soccer players (average age 17 ± 1 years) participated in 2 vs 2, 3 vs 3 and 4 vs 4 SSGs. All games lasted 12 min playing time in total, but each SSG format further consisted of four bout durations: continuous (CON: 1 bout x 12 min) or interval with short (SBD: 6 bouts x 2 min), medium (MBD: 3 bouts x 4 min) or long (LBD: 2 bouts x 6 min) bout durations...
March 24, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28273177/acute-exhaustive-aerobic-exercise-training-impair-cardiomyocyte-function-and-calcium-handling-in-sprague-dawley-rats
#2
Kristine Ljones, Henning Ofstad Ness, Karin Solvang-Garten, Svein Erik Gaustad, Morten Andre Høydal
INTRODUCTION: Recent data from long-distance endurance participants suggest that cardiac function is impaired after completion. Existing data further indicate that right ventricular function is more affected than left ventricular function. The cellular mechanisms underpinning cardiac deterioration are limited and therefore the aim of this study was to examine cardiomyocyte and molecular responses of the right and left ventricle to an acute bout of exhaustive endurance exercise. MATERIALS AND METHODS: Male Sprague-Dawley rats were assigned to sedentary controls or acute exhaustive endurance exercise consisting of a 120 minutes long forced treadmill run...
2017: PloS One
https://www.readbyqxmd.com/read/28257352/cardiovascular-risks-in-long-distance-runners
#3
Bethany Rolfe Witham, Keven Babbitt
Distance running has become increasingly popular since the 1970s. Despite the health benefits, long-distance running has been associated with an increased risk for cardiac events. Healthcare professionals should be familiar with distance running cardiac risk factors and preparticipation screening recommendations from the American Heart Association, and should screen and educate patients during healthcare encounters. Nurses are particularly well suited to educate runners on risks and symptoms of cardiac dysfunction...
April 2017: Journal of Christian Nursing: a Quarterly Publication of Nurses Christian Fellowship
https://www.readbyqxmd.com/read/28253025/long-sprint-abilities-in-soccer-ball-vs-running-drills
#4
Carlo Castagna, Lorenzo Francini, Susana Cristina Araújo Póvoas, Stefano D'Ottavio
PURPOSE: To examine the acute effects of generic (Running Drills, RD) and specific (Small-Sided Games, SSG) Long Sprint Ability (LSA) drills on internal and external load of male soccer-players. METHODS: Fourteen academy-level soccer-players (mean±SD; age 17.6±0.61 years, height 1.81±0.63 m, body-mass 69.53±4.65 kg) performed four 30s LSA bouts for maintenance (work:rest, 1:2) and production (1:5) with RD and SSG drills. Players' external-load was tracked with GPS technology (20Hz) and heart-rate (HR), blood-lactate concentrations (BLc) and rate of perceived exertion (RPE) were used to characterize players' internal-load...
March 2, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28243533/gait-changes-in-a-line-of-mice-artificially-selected-for-longer-limbs
#5
Leah M Sparrow, Emily Pellatt, Sabrina S Yu, David A Raichlen, Herman Pontzer, Campbell Rolian
In legged terrestrial locomotion, the duration of stance phase, i.e., when limbs are in contact with the substrate, is positively correlated with limb length, and negatively correlated with the metabolic cost of transport. These relationships are well documented at the interspecific level, across a broad range of body sizes and travel speeds. However, such relationships are harder to evaluate within species (i.e., where natural selection operates), largely for practical reasons, including low population variance in limb length, and the presence of confounding factors such as body mass, or training...
2017: PeerJ
https://www.readbyqxmd.com/read/28236094/-diseases-and-overuse-injuries-of-the-lower-extremities-in-long-distance-runners
#6
REVIEW
M Tschopp, F Brunner
Running is one of the most popular sports worldwide, with running events attracting hundreds of thousands of runners of all age groups. Running is an effective way to improve health but is also associated with a high risk of injuries. Up to 50% of regular runners report having more than one injury each year. Some injuries are caused by an accident but most are caused by overuse. The most frequent diagnoses are patellofemoral pain syndrome, tibial stress syndrome (shin splint), Achilles tendinopathy, iliotibial band friction syndrome (runner's knee), plantar fasciitis and stress fractures of the metatarsals and tibia...
February 24, 2017: Zeitschrift Für Rheumatologie
https://www.readbyqxmd.com/read/28229568/yo-yo-ir1-vs-incremental-continuous-running-test-for-prediction-of-3000-m-performance
#7
Boris Schmitz, Andreas Klose, Katrin Schelleckes, Charlotte M Jekat, Michael Krüger, Stefan-Martin Brand
BACKGROUND: This study aimed to compare physiological responses during the Yo-Yo intermittent recovery level 1 (Yo-Yo IR1) test and an incremental continuous running field test (ICRT) and to analyze their predictive value on 3000 m running performance. METHODS: Forty moderately trained individuals (18 females) performed the ICRT and Yo-Yo IR1 test to exhaustion. The ICRT was performed as graded running test with an increase of 2.0 km·h-1 after each 3 min interval for lactate diagnostic...
February 22, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28210643/perception-of-health-problems-among-competitive-runners-a-qualitative-study-of-cognitive-appraisals-and-behavioral-responses
#8
Sara Jelvegård, Toomas Timpka, Victor Bargoria, Håkan Gauffin, Jenny Jacobsson
BACKGROUND: Approximately 2 of every 3 competitive runners sustain at least 1 health problem each season. Most of these problems are nontraumatic injuries with gradual onset. The main known risk indicator for sustaining a new running-related injury episode is a history of a previous injury, suggesting that behavioral habits are part of the causal mechanisms. PURPOSE: Identification of elements associated with purposeful interpretations of body perceptions and balanced behavioral responses may supply vital information for prevention of health problems in runners...
December 2016: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/28207880/skeletal-muscle-metabolic-adaptations-to-endurance-exercise-training-are-attainable-in-mice-with-simvastatin-treatment
#9
William M Southern, Anna S Nichenko, Daniel D Shill, Corey C Spencer, Nathan T Jenkins, Kevin K McCully, Jarrod A Call
We tested the hypothesis that a 6-week regimen of simvastatin would attenuate skeletal muscle adaptation to low-intensity exercise. Male C57BL/6J wildtype mice were subjected to 6-weeks of voluntary wheel running or normal cage activities with or without simvastatin treatment (20 mg/kg/d, n = 7-8 per group). Adaptations in in vivo fatigue resistance were determined by a treadmill running test, and by ankle plantarflexor contractile assessment. The tibialis anterior, gastrocnemius, and plantaris muscles were evaluated for exercised-induced mitochondrial adaptations (i...
2017: PloS One
https://www.readbyqxmd.com/read/28195301/people-choose-to-run-at-their-optimal-speed
#10
Joseph K Rathkey, Cara M Wall-Scheffler
OBJECTIVES: The purpose of this article is to test whether people choose to behave in a manner that reduces the amount of energy they use to travel a given distance. While this has been shown consistently for walking, it has never been tested with human running. MATERIALS AND METHODS: We collected energetic data and lower limb anthropometrics on nine men running at six different running speeds. We collected on all six speeds on 3 different days and took the average of the energetic values for each speed...
February 14, 2017: American Journal of Physical Anthropology
https://www.readbyqxmd.com/read/28167230/adaptation-to-a-blood-pressure-telemetry-system-revealed-by-measures-of-activity-agility-and-operant-learning-in-mice
#11
Anfisa Popova, Darya Tsvirkun, Oleg Dolgov, Konstantin Anokhin, Jeffrey Alberts, Evgeniia Lagereva, Marc-Antoine Custaud, Guillemette Gauquelin-Koch, Olga Vinogradova, Alexander Andreev-Andrievskiy
INTRODUCTION: Implantable telemetry enables continuous monitoring of physiological functions in freely moving animals and can greatly complement pharmacological research. Despite its miniaturization, a sensor/transmitter constitutes 5% or more of a mouse's bodyweight. The aim of the present study was to evaluate whether factors related to the presence of a probe/transmitter influence the ambulatory activity, strength, agility, or operant, motivated behaviors of this small rodent. METHODS: Adult male mice (C57BL/6N, 22-25g, 9-10weeks; implanted n=26, intact n=45) were evaluated during week-long tests, conducted three and eight weeks after surgical implantation of the PA-C10 blood pressure probe...
February 3, 2017: Journal of Pharmacological and Toxicological Methods
https://www.readbyqxmd.com/read/28136131/is-marathon-running-toxic-an-observational-study-of-cardiovascular-disease-prevalence-and-longevity-in-54-male-marathon-runners
#12
Benjamin Rosin
OBJECTIVES: Recent literature suggests reduced benefits associated with high intensity (HIT) and or sustained intensity exercise training (SIT). While important, they tend to contrast with other studies of HIT and SIT and may not be representative of all individuals wishing to participate in activities such as marathon running. The purpose of this observational report is to describe a 45-year history of 54 long distance runners, their incidence of death from cardiovascular disease and their ages at death compared to the normal population...
February 8, 2017: Physician and Sportsmedicine
https://www.readbyqxmd.com/read/28117921/a-hybrid-solid-state-nmr-and-electron-microscopy-structure-determination-protocol-for-engineering-advanced-para-crystalline-optical-materials
#13
Brijith Thomas, Jeroen Rombouts, Gert T Oostergetel, Karthick B S S Gupta, Francesco Buda, Koop Lammertsma, Romano Orru, Huub J M de Groot
Hybrid magic-angle spinning (MAS) NMR spectroscopy and TEM were demonstrated for de novo structure determination of para-crystalline materials with a bioinspired fused naphthalene diimide (NDI)-salphen-phenazine prototype light-harvesting compound. Starting from chiral building blocks with C2 molecular symmetry, the asymmetric unit was determined by MAS NMR spectroscopy, index low-resolution TEM diffraction data, and resolve reflection conditions, and for the first time the ability to determine the space group from reciprocal space data using this hybrid approach was shown...
March 8, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28113845/numerical-simulation-of-transit-time-ultrasonic-flowmeters-by-a-direct-approach
#14
Adrian Luca, Regis Marchiano, Jean-Camille Chassaing
This paper deals with the development of a computational code for the numerical simulation of wave propagation through domains with a complex geometry consisting in both solids and moving fluids. The emphasis is on the numerical simulation of ultrasonic flowmeters (UFMs) by modeling the wave propagation in solids with the equations of linear elasticity and in fluids with the linearized Euler equations. This approach requires high performance computing because of the high number of degrees of freedom and the long propagation distances...
March 23, 2016: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28094013/pulmonary-outcome-of-esophageal-atresia-patients-and-its-potential-causes-in-early-childhood
#15
René Dittrich, Philippe Stock, Karin Rothe, Petra Degenhardt
INTRODUCTION: The aim of this study was to illustrate the pulmonary long term outcome of patients with repaired esophageal atresia and to further examine causes and correlations that might have led to this outcome. METHODS: Twenty-seven of 62 possible patients (43%) aged 5-20years, with repaired esophageal atresia were recruited. Body plethysmography and spirometry were performed to evaluate lung function, and the Bruce protocol treadmill exercise test to assess physical fitness...
January 3, 2017: Journal of Pediatric Surgery
https://www.readbyqxmd.com/read/28046601/su-f-t-232-monthly-quality-assurance-in-external-beam-radiation-therapy-using-a-single-system
#16
K Ding, T Ji, I Iordachita, E Velarde, J Hyatt, J Wong
PURPOSE: Monthly quality assurance (QA) is time consuming for external beam radiation therapy, taking as long as 6-8 hours for each machine. It is due to the use and setup of multiple devices for different QA procedures. We have developed a single system with rotational capability for the measurement of both optical light and radiation which significantly reduces the time spent on Monthly QA. METHODS: A single system using mirrors, a phosphor screen and a CCD camera is housed on a cylindrical motor so that it can rotate 360 degrees...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28025558/empirical-analysis-and-modeling-of-stop-line-crossing-time-and-speed-at-signalized-intersections
#17
Keshuang Tang, Fen Wang, Jiarong Yao, Jian Sun
In China, a flashing green (FG) indication of 3 s followed by a yellow (Y) indication of 3 s is commonly applied to end the green phase at signalized intersections. Stop-line crossing behavior of drivers during such a phase transition period significantly influences safety performance of signalized intersections. The objective of this study is thus to empirically analyze and model drivers' stop-line crossing time and speed in response to the specific phase transition period of FG and Y. High-resolution trajectories for 1465 vehicles were collected at three rural high-speed intersections with a speed limit of 80 km/h and two urban intersections with a speed limit of 50 km/h in Shanghai...
December 23, 2016: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28007336/the-combined-frequency-of-igf-and-myostatin-polymorphism-among-track-field-athletes-and-swimmers
#18
Sigal Ben-Zaken, Yoav Meckel, Dan Nemet, Alon Eliakim
OBJECTIVE: The IGF C-1245T (rs35767) and the myostatin (MSTN) Lys(K)-153Arg(R) genetic polymorphism may influence skeletal muscle phenotypes and athletic performance. Carrying the minor IGF T allele and the myostatin rare R allele was associated with higher circulating IGF-I levels, greater muscle mass and improved performance. The aim of the present study was to assess the combined frequency of the IGF 1245T (rs35767) and MSTN 153Arg(R) polymorphism among Israeli track and field athletes (n=111) and swimmers (n=80)...
December 15, 2016: Growth Hormone & IGF Research
https://www.readbyqxmd.com/read/27918655/activity-profiles-and-positional-differences-of-handball-players-during-the-world-championships-in-qatar-2015
#19
Marco Cardinale, Rodney Whiteley, Ahmed Abdelrahman Hosny, Nebojsa Popovic
PURPOSE: Handball is an Olympic sport played indoor by 6 court players and one goalkeeper with rolling substitutions. Limited data exist on elite players competing in a World Championship and virtually no information exits on the evolution of time-motion performance over the course of a long tournament. Therefore, the aim of this study was to analyze time motion characteristics of elite male handball players of the last World Championships played in Qatar in 2015. METHODS: 384 Players from 24 national teams were analyzed during 88 matches using a tracking camera system and a bespoke software (Prozone Handball V...
December 5, 2016: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/27917706/the-changes-of-positive-selection-within-env-gene-of-hiv-1-b-crf07_bc-and-crf08_bc-from-china-over-time
#20
Tingting Li, Binlian Sun, Yanyan Jiang, Haiyan Zeng, Yanpeng Li, Yan Wang, Rongge Yang
It is not clear about the possible evolutionary changes of the three predominant strains of HIV-1 in China over the course of the epidemic. Envelope (env) gene of HIV-1 is a good target for this evolutionary pressure for its enriched epitopes. METHODS: We collected 159 full or part of env sequences sampled between 1997 and 2010 from database of China, we calculated the genetic distance, detected the positively selected sites by PAML suite and then compared the number using Fisher's exact test between the early period 1997 to 2003and the late period2004 to 2010...
December 5, 2016: Current HIV Research
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