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specificity in football

Cláudio Farias, Carla Valério, Isabel Mesquita
The teaching and learning of games and sport-based activities has historically been the dominant form of the physical education curricula. With an interest in providing to students meaningful and culturally situated sporting experiences, Sport Education is probably the most implemented and researched pedagogical model worldwide. However, although there is considerable evidence that the model as a curriculum approach can benefit the development of social goals and healthy sport behaviors, not a single study as to date examined students' game-play development beyond participation in single and isolated teaching units...
March 2018: Journal of Sports Science & Medicine
Jason McGahan, Con Burns, Seán Lacey, Tim Gabbett, Cian O' Neill
PURPOSE: This study investigated the positional running demands of elite Gaelic football players during match-play and compared these demands with typical training activities used to prepare players for competition. METHODS: Global positioning system (GPS) data was obtained from thirty elite Gaelic football players (26.9 ± 3.5 years, 182.8 ± 6.1 cm, 84.6 ± 8.1 kg) across a full season (13 competitive games and 78 training sessions). Only players who completed the full match and respective training sessions were included (n = 107 match files and n = 1,603 training files)...
March 12, 2018: Journal of Strength and Conditioning Research
Martin K Erikstad, Rune Høigaard, Bjørn Tore Johansen, Ngianga-Bakwin Kandala, Tommy Haugen
Childhood sport participation is argued to be important to understand differences in self-regulation and performance level in adolescence. This study sought to investigate if football-specific activities in childhood (6-12 years of age) is related to self-regulatory skills and national under 14- and 15-team selection in Norwegian elite youth football. Data of practice histories and self-regulatory skills of 515 youth football players selected at Norwegian regional level were collected and further analysed using multilevel analyses...
March 9, 2018: Journal of Sports Sciences
Roland Sieghartsleitner, Claudia Zuber, Marc Zibung, Achim Conzelmann
Characteristics of learning activities in early sport participation play a key role in the development of the sporting talent. Therefore, pathways of specialisation or diversification/sampling are as well debated as the implementation of practice- or play-oriented activities. The related issues are currently perceived as a two-dimensional construct of domain specificity and performance orientation . In this context, it has been shown that early specialisation, with experiences in practice and play, has led to Swiss junior national team football players reaching higher success levels as adults...
2018: Frontiers in Psychology
Sailesh V Tummala, David E Hartigan, Karan A Patel, Justin L Makovicka, Anikar Chhabra
Background: Up to 50% of National Collegiate Athletic Association (NCAA) football players have a history of shoulder injuries. The quarterback position has been shown to have a high prevalence of these injuries because of its unique exposures. There is little information regarding the shoulder injury type and mechanism in NCAA quarterbacks. Purpose: To understand the 10-year epidemiology of specific shoulder injury rates in NCAA quarterbacks. Study Design: Descriptive epidemiology study...
February 2018: Orthopaedic Journal of Sports Medicine
Jon S Patricios, Clare L Ardern, Michael David Hislop, Mark Aubry, Paul Bloomfield, Carolyn Broderick, Patrick Clifton, Ruben J Echemendia, Richard G Ellenbogen, Éanna Cian Falvey, Gordon Ward Fuller, Julie Grand, Dallas Hack, Peter Rex Harcourt, David Hughes, Nathan McGuirk, Willem Meeuwisse, Jeffrey Miller, John T Parsons, Simona Richiger, Allen Sills, Kevin B Moran, Jenny Shute, Martin Raftery
The 2017 Berlin Concussion in Sport Group Consensus Statement provides a global summary of best practice in concussion prevention, diagnosis and management, underpinned by systematic reviews and expert consensus. Due to their different settings and rules, individual sports need to adapt concussion guidelines according to their specific regulatory environment. At the same time, consistent application of the Berlin Consensus Statement's themes across sporting codes is likely to facilitate superior and uniform diagnosis and management, improve concussion education and highlight collaborative research opportunities...
March 2, 2018: British Journal of Sports Medicine
Ingunn Ludviksdottir, Hildur Hardardottir, Thorgerdur Sigurdardottir, Gudmundur F Ulfarsson
INTRODUCTION: Exercise can stress the pelvic floor muscles. Numerous women experience urinary incontinence while exercising or competing in sports. This study investigated pelvic floor muscle strength, urinary incontinence, and knowledge in contracting pelvic floor muscles among female athletes and untrained women. MATERIALS AND METHODS: This was a prospective case-control study measuring pelvic floor muscle strength using vaginal pressure meas-urement. Participants answered questions regarding general health, urinary incontinence, and knowledge on pelvic floor muscles...
2018: Læknablađiđ
Brianna D McKay, Amelia A Miramonti, Zachary M Gillen, Todd J Leutzinger, Alegra I Mendez, Nathaniel D M Jenkins, Joel T Cramer
The purpose of the present report was to provide test- and position-specific normative reference values for combine test results based on a large, nationally-representative sample of high school-aged American football players in their freshman, sophomore, and junior classes. Cross-sectional anthropometric and performance data were obtained from 12 different high school American football recruiting combines between March 7, 2015 and January 9, 2016 across the United States. Subjects included a sample (n=7,478) of high school-aged American football athletes in their junior (n=3,779), sophomore (n=2,514), and freshman (n=1,185) classes...
February 27, 2018: Journal of Strength and Conditioning Research
Aleksander Błażkiewicz, Monika Grygorowicz, Arkadiusz Białostocki, Dariusz Czaprowski
BACKGROUND: Characteristic types of actions and training/matches loads of football goalkeepers show that goalkeeper's performance differs from other football's formations. Such situation may predispose to the occurrence of other kinds of injuries in this position. The aim of this study was to analyse epidemiology of injuries in young football goalkeepers. METHODS: 48 football goalkeepers (aged:15.2±1.9 years) were filled the questionnaire aimed at collecting information about all injuries sustained within 12 months before the data collection...
February 26, 2018: Journal of Sports Medicine and Physical Fitness
Jonathan G Beckwith, Wei Zhao, Songbai Ji, Amaris G Ajamil, Richard P Bolander, Jeffrey J Chu, Thomas W McAllister, Joseph J Crisco, Stefan M Duma, Steven Rowson, Steven P Broglio, Kevin M Guskiewicz, Jason P Mihalik, Scott Anderson, Brock Schnebel, P Gunnar Brolinson, Michael W Collins, Richard M Greenwald
Kinematic measurements of head impacts are sensitive to sports concussion, but not highly specific. One potential reason is these measures reflect input conditions only and may have varying degrees of correlation to regional brain tissue deformation. In this study, previously reported head impact data recorded in the field from high school and collegiate football players were analyzed using two finite element head models (FEHM). Forty-five impacts associated with immediately diagnosed concussion were simulated along with 532 control impacts without identified concussion obtained from the same players...
February 22, 2018: Annals of Biomedical Engineering
Dhiren Naidu, Martin Mrazik, Carley Borza, Tara Kobitowich
Reasons for Study: Sideline assessment tools are an important component of concussion evaluations. To date there has been little data evaluating the clinical utility of these tests in professional football. The purpose of this study was to evaluate the clinical utility of the King-Devick Test (KD) in evaluating concussions in professional football players. Baseline data was collected over 2 consecutive seasons in the Canadian Football League as part of a comprehensive medical baseline evaluation. A pilot study with the KD began in 2015 with 306 participants and the next year (2016) there were 917 participants...
February 8, 2018: Journal of Neurotrauma
Astrid Junge, Birgit Prinz
BACKGROUND: Information on the prevalence of mental health problems of elite athletes is inconclusive, most probably due to methodological limitations, such as low response rates, heterogeneous samples. AIMS: To evaluate the prevalence and risk factors of depression and anxiety symptoms in high-level female football players. METHODS: Female football players of 10 German first league (Bundesliga) and 7 lower league teams were asked to answer a questionnaire on players' characteristics, the Center of Epidemiologic Studies Depression Scale (CES-D) and the Generalised Anxiety Disorder (GAD-7) scale...
February 2, 2018: British Journal of Sports Medicine
David W Sproule, Steven Rowson
Current youth football helmets, intended for players under the age of 14 years old, are similar in design and are tested under the same standard as varsity football helmets. This study evaluated the impact performance of matched youth and adult varsity football helmets. Eight helmet models were evaluated using an impact pendulum, with a modified National Operating Committee on Standards for Athletic Equipment (NOCSAE) medium sized headform mounted on a Hybrid III 50th percentile neck. Four locations on the helmet shell at three impact velocities were tested for three trials, for a total of 576 impact tests...
December 2017: Proc Inst Mech Eng P J Sport Eng Technol
Li Zheng-Yao, Huibo Wang, Dongfeng Chen, Kai Sun, Wenyun Yang, Jinbo Yang, Xiangfeng Liu, Songbai Han
Developing advanced cathode materials is still a great interest for sodium-ion batteries. Acceptable commercialization of sodium-ion batteries relies on the design and exploitation of suitable electrode materials. This study offers a novel insight of material design into exploiting high performance P2-type cathode materials for sodium-ion batteries. Skillfully incorporating Mg2+ into some intrinsic Na+ vacancies in Na-ion layers can achieve high-performance P2-type cathode materials for sodium-ion batteries...
February 4, 2018: ChemSusChem
Todd J Leutzinger, Zachary M Gillen, Amelia M Miramonti, Brianna D McKay, Alegra I Mendez, Joel T Cramer
The purpose of the present study was to investigate differences among player positions at three grade levels in elite, collegiate-prospective American football players. Participants' data (n = 7,160) were analyzed for this study [mean height (Ht) ± standard deviation (SD) = 178 ± 7 cm, weight (Wt) = 86 ± 19 kg]. Data were obtained from 12 different high school American football recruiting combines hosted by Zybek Sports (Boulder, Colorado). Eight two-way (9x3) mixed factorial ANOVAs [position (defensive back (DB), defensive end (DE), defensive lineman (DL), linebacker (LB), offensive lineman (OL), quarterback (QB), running back (RB), tight end (TE), and wide receiver (WR) x grade (freshmen, sophomores, and juniors)] were used to test for differences among the mean test scores for each combine measure [Ht, Wt, 40-yard (40yd) dash, pro-agility drill (PA), L-cone drill (LC), vertical jump (VJ), and broad jump (BJ)]...
January 30, 2018: Journal of Strength and Conditioning Research
Robert A Keller, Anthony F De Giacomo, Julie A Neumann, Orr Limpisvasti, James E Tibone
CONTEXT: Current perception dictates that glenohumeral internal rotation deficit (GIRD) is a chronic adaptation that leads to an increased risk of pathologic conditions in the dominant shoulder or elbow of overhead athletes. OBJECTIVE: To determine whether adaptations in glenohumeral range of motion in overhead athletes lead to injuries of the upper extremity, specifically in the shoulder or elbow. DATA SOURCES: An electronic database search was performed using Medline, Embase, and SportDiscus from 1950 to 2016...
January 1, 2018: Sports Health
Jason H McGahan, Shane Mangan, Kieran Collins, Con Burns, Tim Gabbett, Cian O' Neill
The aim of the current study was to compare positional differences in running demands and technical performance variables among elite Gaelic football teams from separate Divisions. Data were obtained from a Division 1 (26.7 ± 2.9 years, 179.2 ± 21.3 cm, 89.9 ± 21.2 kg) and a Division 3 (25.7 ± 3.5 years, 183.0 ± 4.7 cm, 84.4 ± 6.5 kg) team. Match-play running variables were collected using 4-Hz global positioning system (GPS) units (VX Sport, New-Zealand) (Match data sets; Division 1: n = 107, Division 3: n = 97)...
January 24, 2018: Journal of Strength and Conditioning Research
Alex Donaldson, Aisling Callaghan, Mario Bizzini, Andrew Jowett, Patrick Keyzer, Matthew Nicholson
BACKGROUND AND AIM: Understanding the barriers to programme use is important to facilitate implementation of injury prevention programmes in real-word settings. This study investigated the barriers to coaches of adolescent female soccer teams, in Victoria, Australia, implementing the evidence-based FIFA 11+ injury prevention programme. METHODS: Concept mapping with data collected from 19 soccer coaches and administrators. RESULTS: Brainstorming generated 65 statements as barriers to 11+ implementation...
January 20, 2018: Injury Prevention: Journal of the International Society for Child and Adolescent Injury Prevention
Marco Messina, James Njuguna, Chrysovalantis Palas
This work focuses on the proof-mass mechanical structural design improvement of a tri-axial piezoresistive accelerometer specifically designed for head injuries monitoring where medium-G impacts are common; for example, in sports such as racing cars or American Football. The device requires the highest sensitivity achievable with a single proof-mass approach, and a very low error (<1%) as the accuracy for these types of applications is paramount. The optimization method differs from previous work as it is based on the progressive increment of the sensor proof-mass mass moment of inertia (MMI) in all three axes...
January 19, 2018: Sensors
Jorge Baptista, Bruno Travassos, Bruno Gonçalves, Paulo Mourão, João L Viana, Jaime Sampaio
This study aimed to identify the effects of playing formations on tactical behaviour and external workload during football small-sided games. Twenty-three semi-professional footballers integrated three different playing formations in a 7-a-side small-sided game, according to their specific player positions: team 4:3:0 (4 defenders, 3 midfielders); team 4:1:2 (4 defenders, 1 midfielder, 2 forwards); and team 0:4:3 (4 midfielders, 3 forwards). Based on players' movement trajectories, the following individual and collective tactical variables were calculated: total distance covered and distance covered while walking, jogging, running and sprinting, distance from each player to both own and opponent's team centroid (Dist CG and Dist OPP CG, respectively), individual area, team length, team width and surface area...
January 4, 2018: Journal of Strength and Conditioning Research
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