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https://www.readbyqxmd.com/read/29337830/exploring-the-effects-of-playing-formations-on-tactical-behaviour-and-external-workload-during-football-small-sided-games
#1
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
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
#2
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/29314871/normative-functional-performance-values-in-high-school-athletes-the-functional-pre-participation-evaluation-project
#3
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/29299878/talent-identification-and-development-in-male-football-a-systematic-review
#4
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/29275983/the-association-of-vitamin-d-status-in-lower-extremity-muscle-strains-and-core-muscle-injuries-at-the-national-football-league-combine
#5
Brian J Rebolledo, Johnathan A Bernard, Brian C Werner, Andrea K Finlay, Benedict U Nwachukwu, David M Dare, Russell F Warren, Scott A Rodeo
PURPOSE: To evaluate the association between serum vitamin D level and the prevalence of lower extremity muscle strains and core muscle injuries in elite level athletes at the National Football League (NFL) combine. METHODS: During the 2015 NFL combine, all athletes with available serum vitamin D levels were included for study. Baseline data were collected, including age, race, body mass index, position, injury history specific to lower extremity muscle strain or core muscle injury, and Functional Movement Screen scores...
December 19, 2017: Arthroscopy: the Journal of Arthroscopic & related Surgery
https://www.readbyqxmd.com/read/29233665/eccentric-hamstring-strength-deficit-and-poor-hamstring-to-quadriceps-ratio-are-risk-factors-for-hamstring-strain-injury-in-football-a-prospective-study-of-146-professional-players
#6
Justin W Y Lee, Kam-Ming Mok, Hardaway C K Chan, Patrick S H Yung, Kai-Ming Chan
OBJECTIVES: The purpose of this study was to investigate whether preseason isokinetic strength measures were predictive of future HSI among professional football players. DESIGN: Prospective cohort study, Level of evidence 2. METHODS: A total of 169 professional players participated in a preseason isokinetic strength screening, followed by a 10-month competitive season. Testing protocol included the concentric performance of both knee flexion and extension at 60degs-1 and 240degs-1 and the eccentric performance of the knee flexor at 30degs-1...
December 5, 2017: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/29233465/physical-demands-and-technical-performance-in-australian-football-league-women-s-aflw-competition-match-play
#7
Anthea C Clarke, Samuel Ryan, Georgia Couvalias, Ben J Dascombe, Aaron J Coutts, Thomas Kempton
OBJECTIVES: To compare positional differences in the physical and technical demands of Australian Football League Women's (AFLW) match-play. A secondary aim was to examine the time course changes in activity profiles during AFLW match-play. DESIGN: Longitudinal observational study. METHODS: Global positioning system data were collected from 26 players (6 positional groups) from the same club during seven AFLW matches. Absolute and relative physical performance data were categorised into total distance, high-speed running (>14...
December 5, 2017: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/29228862/oculomotor-cognitive-control-abnormalities-in-australian-rules-football-players-with-a-history-of-concussion
#8
Meaghan Clough, Steven Mutimer, David K Wright, Adrian Tsang, Daniel Costello, Andrew Gardner, Peter Stanwell, Richelle Mychasiuk, Mujun Sun, Rhys D Brady, Stuart John McDonald, Kyria Maree Webster, Maddison Johnstone, Joanne Fielding, Bridgette Semple, Denes V Agoston, Owen B White, Richard Frayne, Terence John O'Brien, Sandy Richard Shultz
This study used oculomotor, cognitive, and multimodal magnetic resonance imaging (MRI) measures to assess for neurological abnormalities in current asymptomatic amateur Australian rules footballers (i.e., Australia's most participated collision sport) with a history of sports-related concussion (SRC). Participants were 15 male amateur Australian rules football players with a history of SRC greater than 6 months previously, and 15 sex-, age- and education-matched athlete control subjects that had no history of neurotrauma or participation in collision sports...
December 11, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/29225015/symptomatic-focal-knee-chondral-injuries-in-national-football-league-combine-players-are-associated-with-poorer-performance-and-less-volume-of-play
#9
Matthew T Provencher, Jorge Chahla, Mark E Cinque, George Sanchez, Nicholas I Kennedy, Daniel B Haber, Ashley J Tisosky, Brendin R Beaulieu-Jones, Mark D Price, James M Whalen, Gilbert Moatshe, Robert F LaPrade
PURPOSE: To (1) describe the magnetic resonance imaging (MRI) characteristics of knee chondral injuries identified at the National Football League (NFL) Combine and (2) assess in-game performance of prospective NFL players with previously untreated knee chondral injuries and compare it with matched controls. METHODS: All players with knee chondral injuries identified at the NFL Combine (2009-2015) were retrospectively reviewed. Players with prior knee surgery were excluded...
December 7, 2017: Arthroscopy: the Journal of Arthroscopic & related Surgery
https://www.readbyqxmd.com/read/29216241/discussion-about-different-cut-off-values-of-conventional-hamstring-to-quadriceps-ratio-used-in-hamstring-injury-prediction-among-professional-male-football-players
#10
Monika Grygorowicz, Martyna Michałowska, Tomasz Walczak, Adam Owen, Jakub Krzysztof Grabski, Andrzej Pyda, Tomasz Piontek, Tomasz Kotwicki
OBJECTIVE: To measure the sensitivity and specificity of differences cut-off values for isokinetic Hcon/Qcon ratio in order to improve the capacity to evaluate (retrospectively) the injury of hamstring muscles in professional soccer screened with knee isokinetic tests. DESIGN: Retrospective study. METHODS: Medical and biomechanical data of professional football players playing for the same team for at least one season between 2010 and 2016 were analysed...
2017: PloS One
https://www.readbyqxmd.com/read/29210954/examining-the-influence-of-exercise-intensity-and-hydration-on-gastrointestinal-temperature-in-collegiate-football-players
#11
Julie K DeMartini-Nolan, Jessica L Martschinske, Douglas J Casa, Rebecca M Lopez, Rebecca L Stearns, Matthew S Ganio, Eric Coris
Debate exists regarding the influence of intensity and hydration on body temperature during American football. The purpose of this study was to observe body core temperature responses with changes in intensity and hydration. Twenty-nine male football players (age=21±1y, height=187±9 cm, mass=110.1±23.5 kg, body mass index (BMI)=31.3±5.0, and body surface area (BSA)=2.34±0.27m2) participated in eight days of practice in a warm environment (WBGT:29.6±1.6°C). Participants were identified as Starters (S;n=12) or Non-Starters (NS;n=17) and Linemen (L;n=14) or Non-Linemen (NL;n=15)...
November 27, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29209662/prehistoric-women-s-manual-labor-exceeded-that-of-athletes-through-the-first-5500-years-of-farming-in-central-europe
#12
Alison A Macintosh, Ron Pinhasi, Jay T Stock
The intensification of agriculture is often associated with declining mobility and bone strength through time, although women often exhibit less pronounced trends than men. For example, previous studies of prehistoric Central European agriculturalists (~5300 calibrated years BC to 850 AD) demonstrated a significant reduction in tibial rigidity among men, whereas women were characterized by low tibial rigidity, little temporal change, and high variability. Because of the potential for sex-specific skeletal responses to mechanical loading and a lack of modern comparative data, women's activity in prehistory remains difficult to interpret...
November 2017: Science Advances
https://www.readbyqxmd.com/read/29189933/cardiac-structure-and-function-in-elite-native-hawaiian-and-pacific-islander-rugby-football-league-athletes-an-exploratory-study
#13
Christopher Johnson, Lynsey Forsythe, John Somauroo, Michael Papadakis, Keith George, David Oxborough
The aim of this exploratory study was to define the Athletes Heart (AH) phenotype in Native Hawaiian & Pacific Islander (NH&PI) Rugby Football League (RFL) athletes. Specifically, (1) to describe conventional echocardiographic indices of left ventricle (LV) and right ventricle (RV) structure and function in NH&PI RFL players and matched RFL Caucasian controls (CC) and (2) to demonstrate LV and RV mechanics in these populations. Ethnicity is a contributory factor to the phenotypical expression of the AH. There are no data describing the cardiac phenotype in NH&PI athletes...
November 30, 2017: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/29189531/characterization-of-american-football-injuries-in-children-and-adolescents
#14
Patrick J Smith, Anthony M Hollins, Jeffrey R Sawyer, David D Spence, Shane Outlaw, Derek M Kelly
BACKGROUND: As a collision sport, football carries a significant risk of injury, as indicated by the large number of pediatric football-related injuries seen in emergency departments. There is little information in the medical literature focusing on the age-related injury patterns of this sport. Our purpose was to evaluate the types of football-related injuries that occur in children and adolescents and assess which patient characteristics, if any, affect injury pattern. METHODS: Retrospective chart review was performed of football-related injuries treated at a level 1 pediatric referral hospital emergency department and surrounding urgent care clinics between January 2010 and January 2014...
November 16, 2017: Journal of Pediatric Orthopedics
https://www.readbyqxmd.com/read/29177074/prognostic-factors-for-specific-lower-extremity-and-spinal-musculoskeletal-injuries-identified-through-medical-screening-and-training-load-monitoring-in-professional-football-soccer-a-systematic-review
#15
Tom Hughes, Jamie C Sergeant, Matthew J Parkes, Michael J Callaghan
Background: Medical screening and load monitoring procedures are commonly used in professional football to assess factors perceived to be associated with injury. Objectives: To identify prognostic factors (PFs) and models for lower extremity and spinal musculoskeletal injuries in professional/elite football players from medical screening and training load monitoring processes. Methods: The MEDLINE, AMED, EMBASE, CINAHL Plus, SPORTDiscus and PubMed electronic bibliographic databases were searched (from inception to January 2017)...
2017: BMJ Open Sport & Exercise Medicine
https://www.readbyqxmd.com/read/29176387/effects-of-plyometric-and-directional-training-on-speed-and-jump-performance-in-elite-youth-soccer-players
#16
Marco Beato, Mattia Bianchi, Giuseppe Coratella, Michele Merlini, Barry Drust
Soccer players perform approximately 1350 activities (every 4-6 s), such as accelerations/decelerations, and changes of direction (COD) during matches. It is well established that COD and plyometric training have a positive impact on fitness parameters in football players. This study analyzed the effect of a complex COD and plyometric protocol (CODJ-G) compared to an isolated COD protocol (COD-G) training on elite football players.A randomized pre-post parallel group trial was used in this study. Twenty-one youth players were enrolled in this study (mean ± SDs; age 17 ± 0...
November 22, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29176385/positional-differences-in-running-and-non-running-activities-during-elite-american-football-training
#17
Patrick A Ward, Sam Ramsden, Aaron J Coutts, Andrew T Hulton, Barry Drust
The aim of this investigation was to describe differences in training loads between position groups within professional American football. Integrated micro technology data was collected on 63 NFL football players during an American football training camp. Five key metrics (total distance, high speed distance, Player Load, Player Load per Minute, and Total Inertial Movement Analysis (IMA)) served to quantify both running and non-running activities. Players were classified into position groups (DB, DL, LB, OL, QB, RB, TE, and WR)...
November 22, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29162658/hand-and-wrist-injuries-among-us-high-school-athletes-2005-06-2015-16
#18
Bernadette K Johnson, Lina Brou, Sarah K Fields, Alexandria N Erkenbeck, R Dawn Comstock
BACKGROUND: The risk of hand/wrist injuries is present across various sports. Little is known about the epidemiology of such injuries. The objective of this study was to calculate the rates of hand/wrist injuries and investigate injury patterns among high school athletes. METHODS: Athlete exposure (AE) and hand/wrist injury data were collected during 11 academic years, 2005/06 through 2015/16, from a large sample of US high schools as part of the National High School Sports-Related Injury Surveillance Study...
November 21, 2017: Pediatrics
https://www.readbyqxmd.com/read/29150270/m-biceps-femoris-a-wolf-in-sheep-s-clothing-the-downside-of-a-lower-limb-injury-prevention-training
#19
Thomas Ertelt, Thomas Gronwald
Both, hamstring and ACL injuries are among the most typical injuries, particularly in change of direction and high speed running sports. They're also difficult to treat. Therefore, in the past few years, sports medicine practitioners and exercise scientists have mainly been focusing on the development and implementation of preventive programs in order to reduce the number of lower limb injuries, mainly by improving knee alignment. A number of studies have been able to prove the success of these training interventions, which are mainly addressing sensorimotor abilities and plyometric activities...
November 2017: Medical Hypotheses
https://www.readbyqxmd.com/read/29132269/correlation-of-concussion-symptom-profile-with-head-impact-biomechanics-a-case-for-individual-specific-injury-tolerance
#20
Steven Rowson, Stefan M Duma, Brian D Stemper, Alok S Shah, Jason Mihalik, Jaroslaw Harezlak, Larry D Riggen, Christopher C Giza, John DiFiori, Alison Brooks, Kevin K Guskiewicz, Darren Campbell, Jerry McGinty, Steve Svoboda, Ken Cameron, Steven P Broglio, Thomas McAllister, Michael McCrea
Concussion is a brain injury induced by biomechanical forces that is broadly defined as a complex pathophysiological process affecting the brain. The intricate link between biomechanical input and concussion injury response is poorly understood. We aimed to test the hypothesis that greater biomechanical forces would result in the presentation of more concussion-related symptoms that would take longer to resolve. The objective of this study was to investigate the relationship between an array of biomechanical parameters measured for concussive impacts and the presentation and resolution of concussion symptoms...
November 13, 2017: Journal of Neurotrauma
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