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https://www.readbyqxmd.com/read/28090138/agility-training-in-young-elite-soccer-players-promising-results-compared-to-change-of-direction-drills
#1
A Chaalali, M Rouissi, M Chtara, A Owen, N L Bragazzi, W Moalla, A Chaouachi, M Amri, K Chamari
The aim of this study was to compare the effect of two different training programmes - change of direction (COD) vs. agility (AG) - on straight sprint (SS), COD and AG test performances in young elite soccer players. Thirty-two soccer players (age: 14.5±0.9 years; height: 171.2±5.1 cm; body mass: 56.4±7.1 kg, body fat: 10.3±2.3%) participated in a short-term (6 weeks) training study. Players were randomly assigned to two experimental groups - training with change of direction drills (COD-G, n=11) or using agility training (AG-G, n= 11) - and to a control group (CON-G, n=10)...
December 2016: Biology of Sport
https://www.readbyqxmd.com/read/28087543/leisure-time-sport-and-overuse-injuries-of-extremities-in-children-age-6-13-a-2-5%C3%A2-years-prospective-cohort-study-the-champs-study-dk
#2
Charlène Chéron, Charlotte Leboeuf-Yde, Christine Le Scanff, Eva Jespersen, Christina Trifonov Rexen, Claudia Franz, Niels Wedderkopp
OBJECTIVES: It is not known which sports are most likely to cause overuse injuries of the extremities in children. In this study, we report on the incidence of overuse injuries of the upper and lower extremities in children who participate in various leisure-time sports and relate this to the frequency of sport sessions. DESIGN: Natural experiment including a prospective cohort study. SETTING: 10 state schools in 1 Danish municipality: Svendborg...
January 13, 2017: BMJ Open
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/28060035/etiology-and-recovery-of-neuromuscular-fatigue-following-simulated-soccer-match-play
#4
Kevin Thomas, Jack Dent, Glyn Howatson, Stuart Goodall
PURPOSE: We profiled the etiology and recovery of neuromuscular fatigue post-simulated-soccer-match-play. METHODS: Fifteen semi-professional players completed a 90 min simulated soccer match. Pre-, immediately-post and at 24, 48 and 72 h participants completed a battery of neuromuscular, physical and perceptual tests. Perceived fatigue and muscle soreness were assessed via visual analogue scales. Maximum voluntary contraction (MVC) and twitch responses to electrical (femoral nerve) and magnetic (motor cortex) stimulation during isometric knee-extensor contractions and at rest were measured to assess central (voluntary activation, VA) and peripheral (quadriceps potentiated twitch force, Qtw,pot) fatigue, and responses to single and paired-magnetic stimuli were assessed to quantify corticospinal excitability and short-intracortical inhibition (SICI), respectively...
January 3, 2017: Medicine and Science in Sports and Exercise
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/28031767/mechanical-differences-between-barbell-and-body-optimum-power-loads-in-the-jump-squat-exercise
#6
Irineu Loturco, Lucas A Pereira, Vinicius Zanetti, Katia Kitamura, César C Cal Abad, Ronaldo Kobal, Fabio Y Nakamura
This study compared the values of bar-peak force (PFBar) and power (PPBar), body-peak force (PFBody) and power (PPBody) and bar-mean propulsive power (MPPBar) in different jump-squat (JS) conditions: unloaded condition (UC); bar-loaded condition (BLC) and optimum bar-MPP condition (OBC). Twenty-five soccer players performed the JS using a bar with negligible mass (UC), using the Smith-machine bar (BLC) and using the load capable of maximizing the bar-MPP (OBC). The PFBody was significantly higher in the UC (2847...
December 1, 2016: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28031763/evolution-of-determinant-factors-of-repeated-sprint-ability
#7
Fernando Pareja-Blanco, Luis Suarez-Arrones, David Rodríguez-Rosell, Manuel López-Segovia, Pedro Jiménez-Reyes, Beatriz Bachero-Mena, Juan José González-Badillo
The aim of this study was to investigate the changes in the relationships between repeated sprint ability (RSA) and anthropometric measures as well as fitness qualities in soccer players. Twenty-one professional soccer players performed several anthropometric and physical tests including countermovement vertical jumps (CMJs), a straight-line 30 m sprint (T30), an RSA test (6 x 20 + 20 m with 20 s recovery), a progressive isoinertial loading test in a full squat, a Yo-Yo Intermittent Recovery Test Level-1 (YYIRT-1) and a 20 m shuttle run test (20mSRT)...
December 1, 2016: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28031758/somatic-endurance-performance-and-heart-rate-variability-profiles-of-professional-soccer-players-grouped-according-to-age
#8
Michal Botek, Jakub Krejčí, Andrew J McKune, Iva Klimešová
This cross-sectional study compared somatic, endurance performance determinants and heart rate variability (HRV) profiles of professional soccer players divided into different age groups: GI (17-19.9 years; n = 23), GII (20-24.9 years; n = 45), GIII (25-29.9 years; n = 30), and GIV (30-39 years; n = 26). Players underwent somatic and HRV assessment and maximal exercise testing. HRV was analyzed by spectral analysis of HRV, and high (HF) and low (LF) frequency power was transformed by a natural logarithm (Ln)...
December 1, 2016: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28031753/accuracy-of-a-10-hz-gps-unit-in-measuring-shuttle-velocity-performed-at-different-speeds-and-distances-5-20-m
#9
Marco Beato, Davide Bartolini, Gianluigi Ghia, Paola Zamparo
The aim of this study was to validate the accuracy of a 10 Hz GPS device (STATSports, Ireland) by comparing the instantaneous values of velocity determined with this device with those determined by kinematic (video) analysis (25 Hz). Ten male soccer players were required to perform shuttle runs (with 180° change of direction) at three velocities (slow: 2.2 m·s(-1); moderate: 3.2 m·s(-1); high: maximal) over four distances: 5, 10, 15 and 20 m. The experiments were video-recorded; the "point by point" values of speed recorded by the GPS device were manually downloaded and analysed in the same way as the "frame by frame" values of horizontal speed as obtained by video analysis...
December 1, 2016: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28005978/emergence-of-exploratory-technical-and-tactical-behavior-in-small-sided-soccer-games-when-manipulating-the-number-of-teammates-and-opponents
#10
Carlota Torrents, Angel Ric, Robert Hristovski, Lorena Torres-Ronda, Emili Vicente, Jaime Sampaio
The effects that different constraints have on the exploratory behavior, measured by the variety and quantity of different responses within a game situation, is of the utmost importance for successful performance in team sports. The aim of this study was to determine how the number of teammates and opponents affects the exploratory behavior of both professional and amateur players in small-sided soccer games. Twenty-two professional (age 25.6 ± 4.9 years) and 22 amateur (age 23.1 ± 0.7 years) male soccer players played three small-sided game formats (4 vs...
2016: PloS One
https://www.readbyqxmd.com/read/28004817/assessment-of-myocardial-function-in-elite-athlete-s-heart-at-rest-2d-speckle-tracking-echocardiography-in-korean-elite-soccer-players
#11
Lucy Youngmin Eun, Hyun Wook Chae
The purpose of this study was to investigate Korean elite soccer players' myocardial function using the conventional and advanced speckle tracking imaging to compare the difference with the normal controls. We used 2D echocardiography speckle tracking echocardiography (STE) to evaluate LV regional strain in 29 elite soccer players compared to 29 age-matched healthy controls. Conventional, tissue Doppler, and STI echocardiography was performed, for strain at base and apex, rotation and torsion. There is no difference in longitudinal strain (-17...
December 22, 2016: Scientific Reports
https://www.readbyqxmd.com/read/28003239/meta-analytical-review-of-the-effects-of-football-heading
#12
REVIEW
Anthony P Kontos, Rock Braithwaite, Sara P D Chrisman, Jamie McAllister-Deitrick, Larissa Symington, Valerie L Reeves, Michael W Collins
AIM/OBJECTIVE: The objective of this study was to provide a meta-analysis examining the effects of football heading. DESIGN: Meta-analytical review on football heading effects on neurocognitive performance, cognition and symptom reports. DATA SOURCES: Combinations of the key terms were entered into the following electronic database search engines: Cochrane Libraries, PyscARTICLE, PyscINFO, PubMed, ProQuest, SPORTDiscus and Web of Science on 7 July 2016...
December 21, 2016: British Journal of Sports Medicine
https://www.readbyqxmd.com/read/28002179/game-profile-based-training-in-soccer-a-new-field-approach
#13
Antonio Dello Iacono, Domenico Martone, Drazen Cular, Mirjana Milic, Johnny Padulo
The aim of the study was to profile and compare the time-motion, physiological, and neuromuscular responses of both national youth league (NYL) and UEFA Youth League (UYL) matches with those of an experimental game-profile-based training (GPBT) protocol. Time-motion traits and physiological, perceptual, and neuromuscular responses were investigated in 24 male soccer players across 14 matches and 6 GPBT training sessions, for a total of 420 samples. The GPBT had a greater influence on time-motion traits and perceptual responses than the NYL and UYL matches (all p< 0...
December 8, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28002177/selected-physiological-perceptual-and-physical-performance-changes-during-two-bouts-of-prolonged-high-intensity-intermittent-running-separated-by-72-hours
#14
Nicholas Dobbin, Kevin Lamb, Craig Twist
This study investigated the effects of performing a second 90-minute intermittent running protocol 72 hours after an initial trial on selected physiological, perceptual and sprint running measures. Eight sub-elite soccer players provided measures of isokinetic muscle function, counter-movement jump (CMJ), 10 m sprinting, and muscle soreness before, and at 0, 24, 48 and 72 h after a 90-minute intermittent high intensity running bout (IHIR 1). A second 90-minute intermittent high intensity running bout (IHIR 2) was performed 72 h after the first...
December 8, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27999720/changes-in-dynamic-balance-and-hip-strength-after-an-eight-week-conditioning-program-in-ncaa-division-i-female-soccer-football-athletes
#15
Brandon M Ness, Brett A Comstock, William E Schweinle
BACKGROUND: Lower extremity injury commonly affects female soccer athletes. Decreased dynamic balance and hip strength are identified risk factors for lower extremity injury. Little is known about how these factors adapt to a training stimulus in this population. PURPOSE: To retrospectively investigate changes in lower extremity dynamic balance and isometric hip strength in Division I collegiate female soccer athletes after participating in an eight-week strength and conditioning program...
December 2016: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/27992281/analysis-of-gauntlet-test-performance-and-injury-risk-in-intercollegiate-division-i-female-soccer-football-players-a-retrospective-study
#16
Brandon M Ness, Kory Zimney, William E Schweinle
CONTEXT: Injury risk factors and relevant assessments have been identified in women's soccer athletes. Other tests assess fitness, e.g. the Gauntlet Test (GT). However, little empirical support exists for the utility of the GT to predict time loss injury. OBJECTIVES: To examine the GT as a predictor of injury in intercollegiate Division I female soccer athletes. DESIGN: Retrospective, non-experimental descriptive cohort study. SETTING: College athletic facilities...
December 19, 2016: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/27991485/construct-validity-of-tests-that-measure-kick-performance-for-young-soccer-players-based-on-cluster-analysis-exploring-the-relationship-between-coaches-rating-and-actual-measures
#17
Luiz H P Vieira, Vitor L DE Andrade, Rodrigo L Aquino, Renato Moraes, Fabio A Barbieri, Sérgio A Cunha, Bruno L Bedo, Paulo R Santiago
BACKGROUND: The main aim of this study was to verify the relationship between the classification of coaches and actual performance in field tests that measure the kicking performance in young soccer players, using the K--means clustering technique. METHODS: Twenty--three U--14 players performed eight tests to measure their kicking performance. Four experienced coaches provided a rating for each player as follows: 1--poor, 2--below average, 3--average, 4--very good, 5-excellent as related to three parameters (i...
December 16, 2016: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/27984438/assessing-the-effectiveness-of-the-functional-movement-screen-fms%C3%A2-in-predicting-non-contact-injury-rates-in-soccer-players
#18
Paul D Smith, Michael Hanlon
This study assessed if the Functional Movement Screen (FMS™) can accurately predict non-contact injury in adult soccer players when normalizing non-contact injury occurrence against match exposure levels. Senior male players (n=89) from five League of Ireland semi-professional clubs participated in the study (mean age=23.2 ± 4.4 years; mean height=179.5 ± 6.6 cm; mean body mass=77.5 ± 7.8 kg). Participants performed the FMS™ during preseason and their injury occurrence rates and match minutes were tracked throughout one season...
December 7, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27977300/preventive-neuromuscular-training-for-young-female-athletes-comparison-of-coach-and-athlete-compliance-rates
#19
Dai Sugimoto, Carl G Mattacola, Heather M Bush, Staci M Thomas, Kim D Barber Foss, Gregory D Myer, Timothy E Hewett
CONTEXT:  Fewer athletic injuries and lower anterior cruciate ligament injury incidence rates were noted in studies of neuromuscular training (NMT) interventions that had high compliance rates. However, several groups have demonstrated that preventive NMT interventions were limited by low compliance rates. OBJECTIVE:  To descriptively analyze coach and athlete compliance with preventive NMT and compare the compliance between study arms as well as among school levels and sports...
December 15, 2016: Journal of Athletic Training
https://www.readbyqxmd.com/read/27940807/sex-based-differences-in-cognitive-deficits-and-symptom-reporting-among-acutely-concussed-adolescent-lacrosse-and-soccer-players
#20
Natalie K Sandel, Philip Schatz, Kenneth B Goldberg, Mary Lazar
BACKGROUND: Research on the acute effects of a concussion among lacrosse players is limited, and postconcussion patterns between male and female athletes have yet to be clearly established. Differences in the style of play and protective gear worn among male and female lacrosse players potentially confound a direct comparison of sex-based differences in this population. PURPOSE: To explore sex-based differences in postconcussive neurocognitive functioning and symptom reporting outcomes in concussed adolescent male and female lacrosse players compared with a group of soccer players...
December 9, 2016: American Journal of Sports Medicine
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