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https://www.readbyqxmd.com/read/29329155/ecological-validity-and-reliability-of-an-age-adapted-endurance-field-test-in-young-male-soccer-players
#1
Carlo Castagna, Peter Krustrup, Stefano D'Ottavio, Carlo Pollastro, Andrea Bernardini, Susana Cristina Araújo Póvoas
The purpose of this study was to examine the reliability and the association with relevant match activities (ecological validity) of an age-adapted field test for intermittent high-intensity endurance known as Yo-Yo intermittent recovery level 1 children test (YYIR1C) in young male soccer players. Twenty-eight young male outfield soccer players (age 11.1±0.9 years, height 142±4.4 cm, body mass 37.0±5.9 kg) with at least 2 years of experience in soccer competitions were tested twice using YYIR1C and an age-adapted competitive small-sided game (i...
January 11, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29327823/a-previous-hamstring-injury-affects-kicking-mechanics-in-soccer-players
#2
Archit Navandar, Santiago Veiga, Gonzalo Torres, David Chorro, Enrique Navarro
BACKGROUND: Although the kicking skill is influenced by limb dominance and sex, how a previous hamstring injury affects kicking has not been studied in detail. Thus, the objective of this study was to evaluate the effect of sex and limb dominance on kicking in limbs with and without a previous hamstring injury. METHODS: 45 professional players (males: n=19, previously injured players=4, age=21.16 ± 2.00 years; females: n=19, previously injured players=10, age=22...
January 10, 2018: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/29325759/snps-in-the-vicinity-of-p2x7r-rank-rankl-opg-and-wnt-signalling-pathways-and-their-association-with-bone-phenotypes-in-academy-footballers
#3
Ian Varley, David C Hughes, Julie P Greeves, William D Fraser, Craig Sale
CONTEXT: Genotype plays an important role in influencing bone phenotypes, such as bone mineral density, but the role of genotype in determining responses of bone to exercise has yet to be elucidated. OBJECTIVE: To determine whether 10 SNPs associated with genes in the vicinity of P2X7R, RANK/RANKL/OPG and Wnt Signalling Pathways are associated with bone phenotypes in elite academy footballers (Soccer players) and to determine whether these genotypes are associated with training induced changes in bone...
January 8, 2018: Bone
https://www.readbyqxmd.com/read/29324579/traditional-vs-suspended-pushup-muscle-activation-in-athletes-and-sedentary-females
#4
Majid M Syed-Abdul, Dhwani S Soni, William M Miller, Ryan J Johnson, Jeremy T Barnes, Thomas J Pujol, Jason D Wagganer
Many strength training (ST) programs incorporate pushup exercises, which primarily activate upper body muscles. Past data supports the fact that shoulder girdle muscles [i.e., triceps (T) and anterior deltoids (AD)] exhibit greater electromyography (EMG) activity when a pushup is performed on an unstable [i.e., suspended (SP)] vs. stable [i.e., traditional (TD)] surface (Andrade, 2011). Sixty-nine healthy female volunteers [soccer players (SO), n=24; gymnasts (GY), n=21; sedentary (SE), n=24) performed three TD and three SP pushups...
January 5, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29324577/physical-fitness-performance-of-young-professional-soccer-players-does-not-change-during-several-training-seasons-in-a-spanish-elite-reserve-team-a-club-study-1996-2013
#5
Asier Los Arcos, Javier Martins
The purpose of the study was to assess the changes in physical fitness performance in young professional soccer players during several training seasons in a Spanish elite reserve team. Physical test values (i.e. vertical jump test, straight line sprint test, and discontinuous and progressive submaximal running test) of 97 young professional soccer players that belonged for at least two consecutive seasons to the reserve team of a Spanish professional team from 1996 to 2013 were analyzed. A distinction was made between the soccer players that were promoted to the Spanish 1/2 Divisions (n = 38) (PFL) and those that were not (n = 59) (non-PFL) (until the end of the 2016/2017 season)...
January 5, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29323926/investigating-effects-of-sex-differences-and-prior-concussions-on-symptom-reporting-and-cognition-among-adolescent-soccer-players
#6
Brian L Brooks, Noah Silverberg, Bruce Maxwell, Rebekah Mannix, Ross Zafonte, Paul D Berkner, Grant L Iverson
BACKGROUND: There has been increasing concern regarding the possible effect of multiple concussions on the developing brain, especially for adolescent females. Hypothesis/Purpose: The objectives were to determine if there are differences in cognitive functioning, symptom reporting, and/or sex effects from prior concussions. In a very large sample of youth soccer players, it was hypothesized that (1) there would be no differences in cognitive test performance between those with and without prior concussions, (2) baseline preseason symptoms would be better predicted by noninjury factors than concussion history, and (3) males and females with prior concussions would not have differences in cognition or symptoms...
January 1, 2018: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/29318166/lower-limb-symmetry-comparison-of-muscular-power-between-dominant-and-nondominant-legs-in-healthy-young-adults-associated-with-single-leg-dominant-sports
#7
Alex Vaisman, Rodrigo Guiloff, Juan Rojas, Iris Delgado, David Figueroa, Rafael Calvo
Background: Achieving a symmetrical power performance (difference <15%) between lower limbs is generally recommended during sports rehabilitation. However, athletes in single-leg-dominant sports, such as professional soccer players, could develop significant asymmetry between their dominant and nondominant legs, such that symmetry does not act as a viable comparison. Purpose: To (1) compare maximal muscular power between the dominant and nondominant legs in healthy young adults, (2) evaluate the effect of a single-leg-dominant sport activity performed at the professional level, and (3) propose a parameter of normality for maximal power difference in the lower limbs of this young adult population...
December 2017: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/29314871/normative-functional-performance-values-in-high-school-athletes-the-functional-pre-participation-evaluation-project
#8
James A Onate, Cambrie Starkel, Daniel R Clifton
CONTEXT:   The fourth edition of the Preparticipation Physical Evaluation recommends functional testing for the musculoskeletal portion of the examination; however, normative data across sex and grade level are limited.3 Establishing normative data can provide clinicians reference points with which to compare their patients, potentially aiding in the development of future injury-risk assessments and injury-mitigation programs. OBJECTIVE:   To establish normative functional performance and limb-symmetry data for high school-aged male and female athletes in the United States...
January 9, 2018: Journal of Athletic Training
https://www.readbyqxmd.com/read/29303362/the-demands-of-amputee-soccer-impair-muscular-endurance-and-power-indices-but-not-match-physical-performance
#9
Mário A M Simim, Gustavo R da Mota, Moacir Marocolo, Bruno V C da Silva, Marco Túlio de Mello, Paul S Bradley
We investigated the match demands (distances covered and acute physiological responses) of amputee soccer and its impact on muscular endurance and power. Measures such as heart rate, blood lactate concentration, subjective rating of perceived exertion, and time-motion characteristics were recorded in 16 Brazilian amputee soccer players during matches. Before and after matches, players completed a battery of tests: push-ups, countermovement vertical jump performance, and medicine ball throwing. Small differences were found between the first and second half for the distance covered in total and across various speed categories...
January 5, 2018: Adapted Physical Activity Quarterly: APAQ
https://www.readbyqxmd.com/read/29299878/talent-identification-and-development-in-male-football-a-systematic-review
#10
REVIEW
Hugo Sarmento, M Teresa Anguera, Antonino Pereira, Duarte Araújo
BACKGROUND: Expertise has been extensively studied in several sports over recent years. The specificities of how excellence is achieved in Association Football, a sport practiced worldwide, are being repeatedly investigated by many researchers through a variety of approaches and scientific disciplines. OBJECTIVE: The aim of this review was to identify and synthesise the most significant literature addressing talent identification and development in football. We identified the most frequently researched topics and characterised their methodologies...
January 3, 2018: Sports Medicine
https://www.readbyqxmd.com/read/29295583/carbohydrates-for-soccer-a-focus-on-skilled-actions-and-half-time-practices
#11
REVIEW
Samuel P Hills, Mark Russell
Carbohydrate consumption is synonymous with soccer performance due to the established effects on endogenous energy store preservation, and physical capacity maintenance. For performance-enhancement purposes, exogenous energy consumption (in the form of drinks, bars, gels and snacks) is recommended on match-day; specifically, before and during match-play. Akin to the demands of soccer, limited opportunities exist to consume carbohydrates outside of scheduled breaks in competition, such as at half-time. The link between cognitive function and blood glucose availability suggests that carbohydrates may influence decision-making and technical proficiency (e...
December 25, 2017: Nutrients
https://www.readbyqxmd.com/read/29284166/functional-screening-tests-interrelationships-and-ability-to-predict-vertical-jump-performance
#12
Irineu Loturco, Lucas Adriano Pereira, Ronaldo Kobal, Cesar Cavinato Cal Abad, William Komatsu, Ronaldo Cunha, Gustavo Arliani, Benno Ejnisman, Alberto de Castro Pochini, Fábio Yuzo Nakamura, Moises Cohen
There are several methods used in sports science to identify asymmetries in athletes, given their purported relevance to injury prevention and performance optimization. We aimed to verify whether asymmetries provided by isokinetic assessments, jump tests, and tensiomyography (TMG) are associated with each other, and whether their respective functional indices are related to jumping ability. TMG parameters, unilateral and bilateral squat-jump (SJ) and countermovement-jump (CMJ) performances, and peak torque in knee-extension and flexion with angular velocities of 60o/s and 300o/s for twenty-four soccer players were retained for analyses...
December 28, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/29283933/a-preventive-model-for-muscle-injuries-a-novel-approach-based-on-learning-algorithms
#13
Alejandro López-Valenciano, Francisco Ayala, José Miguel Puerta, Mark De Ste Croix, Francisco Vera-García, Sergio Hernández-Sánchez, Iñaki Ruiz-Pérez, Gregory Myer
INTRODUCTION: The application of contemporary statistical approaches coming from Machine Learning and Data Mining environments to build more robust predictive models to identify athletes at high risk of injury might support injury prevention strategies of the future. PURPOSE: The purpose was to analyse and compare the behaviour of numerous machine learning methods in order to select the best performing injury risk factor model to identify athlete at risk of lower extremity muscle injuries (MUSINJ)...
December 28, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/29283696/the-neuromuscular-determinants-of-unilateral-jump-performance-in-soccer-players-are-direction-specific
#14
Conall Murtagh, Christopher Nulty, Jos Vanrenterghem, Andy O'Boyle, Ryland Morgans, Barry Drust, Robert Erskine
PURPOSE: To investigate differences in neuromuscular factors between elite and non-elite players, and to establish which factors underpin direction-specific unilateral jump performance. METHODS: Elite (n=23; age, 18.1 ± 1.0 yrs; BMI, 23.1 ± 1.8 kg/m2) and non-elite (n=20; age, 22.3 ± 2.7 yrs; BMI, 23.8 ± 1.8 kg/m2) soccer players performed three unilateral countermovement jumps (CMJs) on a force platform in the vertical, horizontal-forward and medial directions...
December 28, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29283691/relationships-between-the-external-and-internal-training-load-in-professional-soccer-what-can-we-learn-from-machine-learning
#15
Arne Jaspers, Tim Op De Beéck, Michel S Brink, Wouter G P Frencken, Filip Staes, Jesse J Davis, Werner F Helsen
PURPOSE: Machine learning may contribute to understanding the relationship between the external load and internal load in professional soccer. Therefore, the relationship between external load indicators and the rating of perceived exertion (RPE) was examined using machine learning techniques on a group and individual level. METHODS: Training data were collected from 38 professional soccer players over two seasons. The external load was measured using global positioning system technology and accelerometry...
December 28, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29283689/physiological-and-physical-responses-according-to-the-game-surface-in-a-soccer-simulation-protocol
#16
Jorge Lopez-Fernandez, Javier Sánchez-Sánchez, Jorge García-Unanue, José Luis Felipe, Enrique Colino-Acevedo, Leonor Gallardo
PURPOSE: Recent studies have shown that soccer player's responses are similar on natural grass (NG) and artificial turf (AT), but they did not control the mechanical properties of these surfaces. This work aimed to analyse the influence of the game surface on amateur soccer player's physical and physiological responses using a soccer simulation protocol (SSP). METHODS: Sixteen amateur players performed three bouts of the SSP on AT and NG. The mechanical properties of both surfaces were recorded...
December 28, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29282554/soccer-helps-build-strong-bones-during-growth-a-systematic-review-and-meta-analysis
#17
REVIEW
Gabriel Lozano-Berges, Ángel Matute-Llorente, Alejandro González-Agüero, Alejandro Gómez-Bruton, Alba Gómez-Cabello, Germán Vicente-Rodríguez, José A Casajús
The aim of this study was to analyze the effects of soccer practice on bone in male and female children and adolescents. MEDLINE, PubMed, SPORTDiscus and Web of Science databases were searched for scientific articles published up to and including October 2016. Twenty-seven studies were included in this systematic review (13 in the meta-analysis). The meta-analysis was performed by using OpenMeta[Analyst] software. It is well documented that soccer practice during childhood provides positive effects on bone mineral content (BMC) and density (BMD) compared to sedentary behaviors and other sports, such as tennis, weightlifting, or swimming...
December 28, 2017: European Journal of Pediatrics
https://www.readbyqxmd.com/read/29277588/sport-related-traumatic-brain-injury-with-and-without-helmets-in-children
#18
Angela Bandte, Friederike-Sophie Fritzsche, Pedram Emami, Getrud Kammler, Klaus Püschel, Kara Krajewski
BACKGROUND: Soccer, bicycling and horseback riding are sports most commonly associated with traumatic brain injury (TBI) in Germany. The latter are commonly practiced with helmets and data on helmet use and usefulness vary widely. METHODS: After ethics approval, retrospective analysis was performed for patients ages 5-17 from 01/2009- 08/2014 based on the diagnosis TBI using the electronic patient file for both university hospital locations. Descriptive data analysis, multi- and univariate logistic regression were employed to calculate the odds ratio...
December 22, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/29276855/assessing-differences-in-cardiorespiratory-fitness-with-respect-to-maturity-status-in-highly-trained-youth-soccer-players
#19
Greg Doncaster, John Iga, Viswanath Unnithan
PURPOSE: The purpose of the study was to examine differences in measures of cardiorespiratory fitness and determinants of running economy with respect to maturity status in a group of highly trained youth soccer players. METHODS: A total of 21 highly trained youth soccer players participated in this study. On separate visits, players' peak oxygen uptake (VO2peak), running economy at 3 different speeds [8 km·h-1, 80% gaseous exchange threshold (GET), and 95% GET], and pulmonary oxygen uptake (VO2) kinetics were determined...
December 23, 2017: Pediatric Exercise Science
https://www.readbyqxmd.com/read/29246592/risk-factors-associated-with-baseline-king-devick-performance
#20
R Moran, T Covassin
OBJECTIVE: This study examined the effect of baseline risk factors on the King-Devick (K-D) test in youth athletes, including of age, sex, and history of concussion. METHODS: A total of 422 youth football and soccer athletes between the ages of 8 and 14 completed a baseline K-D test prior to the start of their respective seasons. Participant age, sex, and history of concussion were analyzed for K-D performance (i.e., errors and baseline time). A series of Mann-Whitney U tests were conducted to determine the effects of risk factors on performance...
December 15, 2017: Journal of the Neurological Sciences
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