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https://www.readbyqxmd.com/read/28103523/anthropogenic-chemical-cues-can-alter-the-swimming-behaviour-of-juvenile-stages-of-a-temperate-fish
#1
Carlos Díaz-Gil, Lucy Cotgrove, Sarah Louise Smee, David Simón-Otegui, Hilmar Hinz, Amalia Grau, Miquel Palmer, Ignacio A Catalán
Human pressure on coastal areas is affecting essential ecosystems including fish nursery habitats. Among these anthropogenic uses, the seasonal increment in the pressure due to leisure activities such as coastal tourism and yachting is an important environmental stressor in many coastal zones. These pressures may elicit understudied impacts due to, for example, sunscreens or other seasonal pollutants. The island of Majorca, northwest Mediterranean Sea, experiences one of the highest number of tourist visits per capita in the world, thus the surrounding coastal habitat is subject to high anthropogenic seasonal stress...
January 6, 2017: Marine Environmental Research
https://www.readbyqxmd.com/read/28090141/do-maximal-aerobic-power-and-blood-lactate-concentration-affect-specific-judo-fitness-test-performance-in-female-judo-athletes
#2
H Garbouj, M A Selmi, R Haj Sassi, M Haj Yahmed, K Chamari, A Chaouachi
The Special Judo Fitness Test (SJFT) has become the test most widely used by coaches and physical trainers for assessment of competitors' judo-specific physical aptitude and training programme prescription. The aim of this study was to investigate the relationship between the SJFT performance indices and both maximal aerobic power and the level of blood lactate concentrations in female judo athletes. Seventeen female judokas (age: 21.9±1.6 years, body mass: 74.6±27.4 kg, height: 164.5±8.6 cm; BMI: 27.1±8...
December 2016: Biology of Sport
https://www.readbyqxmd.com/read/28067762/ecologically-valid-carbohydrate-intake-during-soccer-specific-exercise-does-not-affect-running-performance-in-a-fed-state
#3
Mark P Funnell, Nick R Dykes, Elliot J Owen, Stephen A Mears, Ian Rollo, Lewis J James
This study assessed the effect of carbohydrate intake on self-selected soccer-specific running performance. Sixteen male soccer players (age 23 ± 4 years; body mass 76.9 ± 7.2 kg; predicted VO2max = 54.2 ± 2.9 mL∙kg(-1)∙min(-1); soccer experience 13 ± 4 years) completed a progressive multistage fitness test, familiarisation trial and two experimental trials, involving a modified version of the Loughborough Intermittent Shuttle Test (LIST) to simulate a soccer match in a fed state. Subjects completed six 15 min blocks (two halves of 45 min) of intermittent shuttle running, with a 15-min half-time...
January 5, 2017: Nutrients
https://www.readbyqxmd.com/read/28054492/match-running-performance-and-skill-execution-improves-with-age-but-not-the-number-of-disposals-in-young-australian-footballers
#4
Paul B Gastin, Christie Tangalos, Lorena Torres, Sam Robertson
This study investigated age-related differences in maturity, physical and functional characteristics and playing performance in youth Australian Football (AF). Young male players (n = 156) were recruited from 12 teams across 6 age groups (U10-U15) of a recreational AF club. All players were tested for body size, maturity and fitness. Player performance was assessed during a match in which disposals (kicks and handballs) and their effectiveness were coded from a video recording and match running performance measured using Global Positioning System...
January 5, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28051343/methodological-considerations-when-quantifying-high-intensity-efforts-in-team-sport-using-global-positioning-system-technology
#5
Matthew C Varley, Arne Jaspers, Werner F Helsen, James J Malone
Purpose Sprints and accelerations are popular performance indicators in applied sport. The methods used to define these efforts using athlete tracking technology could affect the number of efforts reported. The study aimed to determine the influence of different techniques and settings for detecting high-intensity efforts using Global Positioning System (GPS) data. Methods Velocity and acceleration data of a professional soccer match was recorded via 10-Hz GPS. Velocity data was filtered using either a median or exponential filter...
January 4, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28031765/physical-performance-during-water-polo-matches-the-effect-of-the-players-competitive-level
#6
Petros G Botonis, Argyris G Toubekis, Theodoros I Platanou
The purpose of the study was to compare playing intensity and performance changes within a water-polo match in players of different competitive levels. High-level (n = 7) and lower-level (n = 7) players performed a progressively increasing speed test of 5 x 200 m swimming and speed corresponding to lactate concentration of 4.0, 5.0 and 10.0 mmol•l-1 was calculated. Repeated sprint ability (8 x 20 m) was tested at pre-, the middle and post-match and a 400 m swimming test was completed at pre and post in five water-polo matches...
December 1, 2016: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28004133/tail-autotomy-affects-bipedalism-but-not-sprint-performance-in-a-cursorial-mediterranean-lizard
#7
Pantelis Savvides, Maria Stavrou, Panayiotis Pafilis, Spyros Sfenthourakis
Running is essential in all terrestrial animals mainly for finding food and mates and escaping from predators. Lizards employ running in all their everyday functions, among which defense stands out. Besides flight, tail autotomy is another very common antipredatory strategy within most lizard families. The impact of tail loss to sprint performance seems to be species dependent. In some lizard species, tail shedding reduces sprint speed, in other species, increases it, and, in a few species, speed is not affected at all...
February 2017: Die Naturwissenschaften
https://www.readbyqxmd.com/read/27992260/a-three-week-unexpected-disturbance-program-improves-physical-performance-of-elite-female-athletes
#8
Jorg Teichmann, Edin K Suwarganda, C Martyn Beaven, Kim Hébert-Losier, Lee Jin Wei, Florencio Tenllado Vallejo, Philip Lew Chun Foong, Ramlan Abdul Aziz, Yeo Wee Kian, Dietmar Schmidtbleicher
CONTEXT: Sensorimotor training is commonly used in a rehabilitative setting; however, the effectiveness of an unexpected disturbance program (UDP) to enhance performance measures in uninjured elite athletes is unknown. OBJECTIVE: To assess the impact of a three-week UDP program on strength, power, and proprioceptive measures. DESIGN: Matched-group, pre- post design. SETTING: National Sports Institute. PARTICIPANTS: Twenty-one international-level female field hockey athletes...
December 19, 2016: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/27990222/spatial-awareness-is-related-to-moderate-intensity-running-during-a-collegiate-rugby-match
#9
Kyle S Beyer, David H Fukuda, Amelia M Miramonti, Mattan W Hoffman, Ran Wang, Michael B LA Monica, Josh J Riffe, Satoru Tanigawa, Jeffrey R Stout, Jay R Hoffman
The purpose of the present study was to evaluate the relationship between spatial awareness, agility, and distance covered in global positioning system (GPS) derived velocity zone classifications during a collegiate rugby match. Twelve American collegiate rugby union players (mean±SD; age: 21.2±1.4 y; weight: 85.0±16.0 kg; 7 forwards & 5 backs) on a single team volunteered to participate in this investigation. The distances travelled at low (walking/jogging; <2.7m/s), moderate (cruising/striding; 2.7-5...
2016: International Journal of Exercise Science
https://www.readbyqxmd.com/read/27941491/low-intensity-sprint-training-with-blood-flow-restriction-improves-100-m-dash
#10
M Behringer, D Behlau, J Montag, M McCourt, J Mester
PURPOSE: We investigated the effects of practical blood flow restriction (pBFR) of leg muscles during sprint training on the 100 m dash time in well-trained sport students. METHODS: Participants performed 6x100 m sprints at 60-70% of their maximal 100 m sprinting speed twice a week for 6 weeks, either with (IG; n=12) or without pBFR (CG; n=12). RESULTS: The 100 m dash time significantly decreased more in the IG (-0.38±0.24 s) than in the CG (-0...
November 25, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27930450/yo-yo-intermittent-recovery-test-level-2-and-its-relationship-to-other-typical-soccer-field-tests-in-female-collegiate-soccer-players
#11
Robert G Lockie, Farzad Jalilvand, Matthew R Moreno, Ashley J Orjalo, Fabrice G Risso, Sophia Nimphius
The ability to complete high-intensity running is essential for soccer. The Yo-Yo Intermittent Recovery Test Level 2 (YYIRT2) can measure this capacity, but there is limited information regarding this assessment in collegiate female soccer players. This study investigated the YYIRT2 as a measure of high-intensity running in this population, and its relationship to other soccer field tests. Twenty-one players from a Division I team were recruited. In addition to the YYIRT2, subjects completed linear (0-5, 0-10, 0-30 m sprint intervals) and change-of-direction (pro-agility and 60-yard shuttle) speed tests, as well as the YYIRT Level 1 (YYIRT1), to assess relationships with YYIRT2 via correlations (p < 0...
November 19, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27930447/carbohydrate-and-caffeine-improves-high-intensity-running-of-elite-rugby-league-interchange-players-during-simulated-match-play
#12
Jon S Clarke, Jamie Highton, Graeme L Close, Craig Twist
The study examined the effects of carbohydrate and caffeine ingestion on simulated rugby league interchange performance. Eight male elite rugby league forwards completed two trials of a rugby league simulation protocol for interchange players seven days apart in a randomized crossover design, ingesting either carbohydrate (CHO; 40 g·h-1) or carbohydrate and caffeine (CHO-C) (40 g·h-1 + 3 mg·kg-1) drink. Movement characteristics, heart rate, ratings of perceived exertion (RPE), and countermovement jump height (CMJ) were measured during the protocol...
November 19, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27918679/movement-patterns-and-metabolic-responses-during-an-international-rugby-sevens-tournament
#13
Anthony Couderc, Claire Thomas, Mathieu Lacome, Julien Piscione, Julien Robineau, Rémi Delfour-Peyrethon, Rachel Borne, Christine Hanon
PURPOSE: This study investigated the running-demands and associated metabolic perturbations during an official rugby sevens tournament. METHODS: Twelve elite players participated in seven matches wearing Global Positioning System units. Maximal sprinting speed (MSS) and maximal aerobic speed (MAS) were measured. High-intensity threshold was individualized relative to MAS (>100% of MAS) and very high-intensity distance were reported relative to both MAS and MSS...
December 5, 2016: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/27918677/a-comparison-of-isometric-mid-thigh-pull-strength-vertical-jump-sprint-speed-and-change-of-direction-speed-in-academy-netball-players
#14
Christopher Thomas, Paul Comfort, Paul A Jones, Thomas Dos'Santos
PURPOSE: To investigate (a) the relationships between maximal isometric strength, vertical jump (VJ), sprint speed, and change of direction speed (CODS) in academy netball players, and (b) determine whether players who have high performance in isometric strength testing would demonstrate superior performance in VJ, sprint speed, and CODS measures. METHODS: Twenty-six young female netball players (age = 16.1 ± 1.2 years; height = 173.9 ± 5.7 cm; body mass = 66...
December 5, 2016: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/27918240/circadian-rhythm-effect-on-physical-tennis-performance-in-trained-male-players
#15
Álvaro López-Samanes, Diego Moreno-Pérez, José L Maté-Muñoz, Raúl Domínguez, Jesús G Pallarés, Ricardo Mora-Rodriguez, Juan F Ortega
To determine the effect of circadian rhythm on neuromuscular responses and kinematics related to physical tennis performance, after a standardised warm-up, 13 highly competitive male tennis players were tested twice for serve velocity/accuracy (SVA), countermovement vertical jump (CMJ), isometric handgrip strength (IS), agility T-test (AGIL) and a 10-m sprint (10-m RUN). In a randomised, counter-balance order, tennis players underwent the test battery twice, either in the morning (i.e., AM; 9:00 h) and in the afternoon (i...
December 5, 2016: Journal of Sports Sciences
https://www.readbyqxmd.com/read/27905864/determining-friction-and-effective-loading-for-sled-sprinting
#16
Matt R Cross, Farhan Tinwala, Seth Lenetsky, Pierre Samozino, Matt Brughelli, Jean-Benoit Morin
Understanding the impact of friction in sled sprinting allows the quantification of kinetic outputs and the effective loading experienced by the athlete. This study assessed changes in the coefficient of friction (µk) of a sled sprint-training device with changing mass and speed to provide a means of quantifying effective loading for athletes. A common sled equipped with a load cell was towed across an athletics track using a motorised winch under variable sled mass (33.1-99.6 kg) with constant speeds (0...
December 1, 2016: Journal of Sports Sciences
https://www.readbyqxmd.com/read/27901341/the-efficacy-and-characteristics-of-warm-up-and-re-warm-up-practices-in-soccer-players-a-systematic-review
#17
Amri Hammami, James Zois, Maamer Slimani, Mark Russel, Ezdine Bouhlel
INTRODUCTION: This review aimed (i) to evaluate the current research that examines the efficacy of warm-up (WU) and re-warm-up (RWU) on physical performance, and (ii) to highlight the WU and RWU characteristics that optimise subsequent performance in soccer players. EVIDENCE ACQUISITION: A computerized search was performed in the PubMed, ScienceDirect and Google Scholar (from 1995 to December 2015) for English-language, peer- reviewed investigations using the terms "soccer" OR "football" AND "warm-up" OR "stretching" OR "post-activation potentiation" OR "pre-activity" OR "re-warm-up" AND "performance" OR "jump" OR "sprint" OR "running"...
November 30, 2016: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/27896814/evaluation-of-swimming-performance-for-fish-passage-of-longnose-dace-rhinichthys-cataractae-using-an-experimental-flume
#18
D R Dockery, T E McMahon, K M Kappenman, M Blank
The swimming performance of longnose dace Rhinichthys cataractae, the most widely distributed minnow (Cyprinidae) in North America, was assessed in relation to potential passage barriers. The study estimated passage success, maximum ascent distances and maximum sprint speed in an open-channel flume over a range of water velocities and temperatures (10·7, 15·3 and 19·3° C). Rhinichthys cataractae had high passage success (95%) in a 9·2 m flume section at mean test velocities of 39 and 64 cm s(-1) , but success rate dropped to 66% at 78 cm s(-1) ...
November 28, 2016: Journal of Fish Biology
https://www.readbyqxmd.com/read/27893482/effects-of-sprint-training-with-and-without-weighted-vest-on-speed-and-repeated-sprint-ability-in-male-soccer-players
#19
Ezequiel Rey, Alexis Padrón-Cabo, Diego Fernández-Penedo
The purpose of this study was to assess the effect resisted sprint training using weighted vests (WV) compared with unresisted sprint training (US) on physical fitness (countermovement jump, 10 m sprint, 30 m sprint and repeated sprint ability (RSA)) in amateur male soccer players. 19 soccer players (age: 23.7±4.5 years; height: 178.3±5.8 cm; body mass: 72.9±5.2 kg) were randomly assigned to a WV (n= 10) or a US (n= 9) group. The intervention program had to be carried out 2 times a week over 6 weeks. The only difference between the two interventions was that the WV group performed all the sprints with an additional weight of 18...
November 16, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27882914/propulsive-limb-coordination-and-body-acceleration-in-sprint-breaststroke-swimming
#20
Marek Strzała, Arkadiusz Stanula, Andrzej Ostrowski, Marcin Kaca, Piotr Kreżałek, Jacek Głodzik
BACKGROUND: This work is aimed at examining how coordination and kinematic indices interplay with swimming performance measured by average speed in 50m all-out test. METHODS: The group of 34 male competitive swimmers (19.1± 1.91 years old) participated in the study. The underwater movements of swimmers' bodies were recorded providing side- shots. Accelerations and angular velocity of pitch rotation of swimmer's sacrum were measured with inertial sensor device (three-axial accelerometer and gyroscope)...
November 24, 2016: Journal of Sports Medicine and Physical Fitness
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