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https://www.readbyqxmd.com/read/29149240/z-scores-based-methods-and-their-application-to-biological-monitoring-an-example-in-professional-soccer-players
#1
Guillaume Saulière, Jérôme Dedecker, Laurie-Anne Marquet, Pierre Rochcongar, Jean-Francois Toussaint, Geoffroy Berthelot
The clinical and biological follow-up of individuals, such as the biological passport for athletes, is typically based on the individual and longitudinal monitoring of hematological or urine markers. These follow-ups aim to identify abnormal behavior by comparing the individual's biological samples to an established baseline. These comparisons may be done via different ways, but each of them requires an appropriate extra population to compute the significance levels, which is a non-trivial issue. Moreover, it is not necessarily relevant to compare the measures of a biomarker of a professional athlete to that of a reference population (even restricted to other athletes), and a reasonable alternative is to detect the abnormal values by considering only the other measurements of the same athlete...
November 15, 2017: Biostatistics
https://www.readbyqxmd.com/read/29130575/a-prospective-investigation-to-evaluate-risk-factors-for-lower-extremity-injury-risk-in-male-youth-soccer-players
#2
Paul J Read, Jon L Oliver, Mark B A De Ste Croix, Gregory D Myer, Rhodri S Lloyd
There is an inherent risk of injury in male youth football; however, pertinent risk factors for injury have yet to be examined. This study used a prospective cohort design with 357 elite male youth football players (aged 10-18 years) assessed during the pre-season period and then monitored during the season recording all non-contact lower extremity injuries. Screening tests included: single leg hop for distance (SLHD); 75% of maximum hop and stick (75%Hop); single leg countermovement jump (SLCMJ); and the tuck jump assessment (TJ)...
November 11, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29125037/an-audit-of-injuries-in-six-english-professional-soccer-academies
#3
Paul J Read, Jon L Oliver, Mark B A De Ste Croix, Gregory D Myer, Rhodri S Lloyd
Regulations now state that professional academies in the United Kingdom are required to substantially increase the volume of soccer training. This study assessed the current injury occurrence, providing an update to reports published prior to the introduction of the Elite Player Performance Plan (EPPP). 608 soccer players aged 11-18 years from six professional soccer clubs were prospectively monitored, recording injuries during the 2014-2015 season. An injury rate of 1.32 injuries per player/season was indicated with a mean time loss of 21...
November 10, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29125029/match-derived-relative-pitch-area-changes-the-physical-and-team-tactical-performance-of-elite-soccer-players-in-small-sided-soccer-games
#4
Sigrid B H Olthof, Wouter G P Frencken, Koen A P M Lemmink
Small-sided games (SSGs) are used in training sessions to prepare for full-sized matches. For the same number of players, smaller pitch sizes result in decreased physical performance and shorter interpersonal distances. A relative pitch area derived from the full-sized match results in larger pitch sizes and this may increase the fit between SSGs and full-sized matches. This study aimed to investigate SSGs with a traditional small pitch and a match-derived relative pitch area in youth elite soccer players. Four age categories (under-13, under-15, under-17 and under-19) played 4 vs...
November 10, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29119246/skeletal-muscle-and-performance-adaptations-to-high-intensity-training-in-elite-male-soccer-players-speed-endurance-runs-versus-small-sided-game-training
#5
Dan Fransson, Tobias Schmidt Nielsen, Karl Olsson, Tobias Christensson, Paul S Bradley, Ioannis G Fatouros, Peter Krustrup, Nikolai Baastrup Nordsborg, Magni Mohr
PURPOSE: To examine the skeletal muscle and performance responses across two different exercise training modalities which are highly applied in soccer training. METHODS: Using an RCT design, 39 well-trained male soccer players were randomized into either a speed endurance training (SET; n = 21) or a small-sided game group (SSG; n = 18). Over 4 weeks, thrice weekly, SET performed 6-10 × 30-s all-out runs with 3-min recovery, while SSG completed 2 × 7-9-min small-sided games with 2-min recovery...
November 8, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/29117025/heads-up-the-presentation-of-schizoaffective-disorder-in-an-elite-college-soccer-player-with-prior-concussion
#6
Solomon J Adelsky, Simon Ducharme, Emily K Wilner, Benjamin Yudkoff, Simon Lejeune
No abstract text is available yet for this article.
November 2017: Harvard Review of Psychiatry
https://www.readbyqxmd.com/read/29083129/fractures-in-german-elite-male-soccer
#7
Erik Schiffner, David Latz, Jan P Grassmann, Alberto Schek, Armin Scholz, Joachim Windolf, Pascal Jungbluth, Johannes Schneppendahl
INTRODUCTION: Aim of this retrospective cohort study was to identify fracture epidemiology and off times after different types of fractures in German male elite soccer players from the first division Bundesliga based on information from the public media. METHODS: Exposure and fracture data over 7.5 consecutive seasons (2009/10 -1.Half 2016/17) were collected from two media based register (transfermarkt.de® and kicker.de®). RESULTS: 357 fractures from 290 different players were recorded with an incidences of 0...
October 27, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/29058465/positional-synchronization-affects-physical-and-physiological-responses-to-preseason-in-professional-football-soccer
#8
Hugo Folgado, Bruno Gonçalves, Jaime Sampaio
This study aimed to identify changes in tactical, physical and physiological performances in large-sided games during the preseason of elite footballers. Thirty professional football players participated in several GK+8vs.8+GK large-sided games across the first four weeks of the season. Players were monitored by GPS units and heart rate monitors to quantify physical, physiological and tactical performances. The variables were compared according to the preseason period, players' positioning and professional experience...
October 23, 2017: Research in Sports Medicine
https://www.readbyqxmd.com/read/29019743/injury-prevention-in-male-youth-soccer-current-practices-and-perceptions-of-practitioners-working-at-elite-english-academies
#9
Paul J Read, Pablo Jimenez, Jon L Oliver, Rhodri S Lloyd
Forty-one practitioners inclusive of physiotherapists, sports scientists and strength and conditioning coaches from the academies of elite soccer clubs in the United Kingdom completed an on-line questionnaire which examined their: (1) background information; (2) perceptions of injury occurrence and risk factors; (3) screening and return to play; and (4) approach to designing and delivering injury prevention programmes with a response rate of 55% (41/75). Contact injuries were the most common mechanism reported and players between 13-16 years of age were perceived to be at the greatest risk...
October 11, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29018362/effects-of-unloaded-vs-loaded-plyometrics-on-speed-and-power-performance-of-elite-young-soccer-players
#10
Ronaldo Kobal, Lucas A Pereira, Vinicius Zanetti, Rodrigo Ramirez-Campillo, Irineu Loturco
The purpose of this study was to investigate the effects of loaded and unloaded plyometric training strategies on speed and power performance of elite young soccer players. Twenty-three under-17 male soccer players (age: 15.9 ± 1.2 years, height: 178.3 ± 8.1 cm, body-mass (BM): 68.1 ± 9.3 kg) from the same club took part in this study. The athletes were pair-matched in two training groups: loaded vertical and horizontal jumps using an haltere type handheld with a load of 8% of the athletes' body mass (LJ; n = 12) and unloaded vertical and horizontal plyometrics (UJ; n = 11)...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28980345/exercise-physiology-and-nutritional-perspectives-of-elite-soccer-refereeing
#11
REVIEW
Kai Schenk, Mario Bizzini, Hannes Gatterer
Referees are an integral part of soccer and their performance is fundamental for regular match flow, irrespective of the competition level or age classes. So far, scientific interest was mainly limited to aspects of exercise physiology and match performance of soccer referees, whereas recommendations for nutrition were adopted from active professional soccer. In contrast to elite soccer players most referees are non-professional and engaged in different occupations. Furthermore, elite referees and soccer players differ in regard to age, body composition, aerobic capacity and training load...
October 5, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28976491/genetic-variants-and-hamstring-injury-in-soccer-an-association-and-validation-study
#12
Jon Larruskain, David Celorrio, Irantzu Barrio, Adrian Odriozola, Susana M Gil, Juan Ramon Fernandez-Lopez, Raul Nozal, Isusko Ortuzar, Jose A Lekue, Jose M Aznar
PURPOSE: To investigate the association of candidate single nucleotide polymorphisms (SNPs) with non-contact hamstring muscle injuries in elite soccer players, and to create and validate a model to assess the risk of hamstring injury. METHODS: 107 elite male outfield players were prospectively followed for 6 seasons. Players were genotyped for 37 SNPs previously investigated in relation to musculoskeletal injuries. The association of SNPs, previous injury, age, level of play, position and anthropometric data with 129 hamstring injuries (413 observations) was investigated in the discovery phase (2010-2015), and a multivariable Cox-frailty model was created using forward selection...
October 2, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28953958/effects-of-age-on-the-soccer-specific-cognitive-motor-performance-of-elite-young-soccer-players-comparison-between-objective-measurements-and-coaches-evaluation
#13
COMPARATIVE STUDY
Halim Hicheur, Alan Chauvin, Steve Chassot, Xavier Chenevière, Wolfgang Taube
The cognitive-motor performance (CMP), defined here as the capacity to rapidly use sensory information and transfer it into efficient motor output, represents a major contributor to performance in almost all sports, including soccer. Here, we used a high-technology system (COGNIFOOT) which combines a visual environment simulator fully synchronized with a motion capture system. This system allowed us to measure objective real-time CMP parameters (passing accuracy/speed and response times) in a large turf-artificial grass playfield...
2017: PloS One
https://www.readbyqxmd.com/read/28952828/locomotor-and-heart-rate-responses-of-floaters-during-small-sided-games-in-elite-soccer-players-effect-of-pitch-size-and-inclusion-of-goal-keepers
#14
Mathieu Lacome, Ben M Simpson, Yannick Cholley, Martin Buchheit
PURPOSE: To (1) compare the locomotor and heart rate responses between floaters and regular players during both small and large small sided games (SSGs) and (2) examine whether the type of game (i.e., game simulation vs possession game) affects the magnitude of the difference between floaters and regular players. METHODS: Data were collected in 41 players belonging to an elite French football team during three consecutive seasons (2014-2017). 5-Hz GPS were used to collect all training data, with the Athletic Data Innovation analyser (v5...
September 27, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28946544/successful-return-to-play-following-adductor-longus-proximal-tendon-rupture-in-professional-soccer-without-re-injury-at-12-months-a-case-report
#15
Ömer B Gözübüyük, Maarten H Moen, Mehmet Akman, Ioakim Ipseftel, Agah Karakuzu
Treatment of total ruptures of adductor longus is challenging in professional sports. Time for return to pre-injury level as well as re-injury rates are of concern and surgical and conservative treatment approaches are debated; yet no consensus approach described for professional athletes. We present a case of a professional soccer player who experienced a rupture in his left adductor longus proximal tendon during a game and was treated conservatively. This case was followed-up during clinical assessment, imaging and strength testing until and after return to play...
September 8, 2017: Journal of Back and Musculoskeletal Rehabilitation
https://www.readbyqxmd.com/read/28944722/is-strength-training-frequency-a-key-factor-to-develop-performance-adaptations-in-young-elite-soccer-players
#16
Carlos Otero-Esquina, Moisés de Hoyo Lora, Óliver Gonzalo-Skok, Sergio Domínguez-Cobo, Hugo Sánchez
The aim of this study was to analyse the effects of a combined strength-training programme (full-back squat, YoYo(TM) leg curl, plyometrics and sled towing exercises) on performance in elite young soccer players and to examine the effects when this training programme was performed one or two days per week. Thirty-six male soccer players (U-17 to U-19) were recruited and assigned to experimental groups (EXP1: 1 s w(-1); EXP2: 2 s w(-1)) or a control group (CON). Performance was assessed through a countermovement jump (CMJ) test (relative peak power [CMJPP] and CMJ height [CMJH]), a 20-m linear sprint test with split-times at 10-m, and a change of direction test (V-cut test) 1 week before starting the training programme and also 1 week after performing such training programme...
September 24, 2017: European Journal of Sport Science
https://www.readbyqxmd.com/read/28944642/variability-of-gps-derived-running-performance-during-official-matches-in-elite-professional-soccer-players
#17
Hani Al Haddad, Alberto Méndez-Villanueva, Nacho Torreño, Diego Munguía-Izquierdo, Luis Suárez-Arrones
AIM: The aim of this study was to assess the match-to-match variability obtained using GPS devices, collected during official games in professional soccer players. METHODS: GPS-derived data from nineteen elite soccer players were collected over two consecutive seasons. Time-motion data for players with more than five full-match were analyzed (n=202). Total distance covered (TD), TD >13-18 km/h, TD >18-21 km/h, TD >21 km/h, number of acceleration >2.5-4 m...
September 22, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28933710/elite-youth-soccer-players-physiological-responses-time-motion-characteristics-and-game-performance-in-4-vs-4-small-sided-games-the-influence-of-coach-feedback
#18
Mirko Brandes, Sebastian Elvers
The purpose of this study was to determine the impact of mild vs. strongly pushed coach feedback on the physiological response, ratio of perceived exertion (RPE), and time-motion characteristics in soccer training with small-sided games (SSGs). Sixteen elite youth soccer players (aged 17.2 ± 0.7 years, V[Combining Dot Above]O2max 62.1 ± 3.8 ml·kg·min) played two 4 vs. 4 small-sided games each. In random order, the coach provided a mild, unobtrusive, or a strongly pushed feedback throughout the game. Physiological measurements included heart rate expressed in mean values and intensity zones, blood lactate concentration, and RPE...
October 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28931173/hopping-and-landing-performance-in-male-youth-soccer-players-effects-of-age-and-maturation
#19
Paul J Read, Jon L Oliver, Mark B A De Ste Croix, Gregory D Myer, Rhodri S Lloyd
Quantifying hopping and landing performances can assist coaches in identifying young male soccer players who may be at increased risk of injury. The influence of chronological age and maturation on these measures in this population is unknown. Single leg hop for distance (SLHD) and 75% horizontal hop and stick landing force (75%Hop) were examined in a cross-sectional sample (N=400) of elite male youth soccer players. Between-group differences for both chronological age (U11-U18) and stage of maturation (pre-, circa- or post-peak height velocity (PHV)) were analyzed...
November 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28930876/case-study-sleep-and-injury-in-elite-soccer-a-mixed-method-approach
#20
Mathieu Nédélec, Cédric Leduc, Brian Dawson, Gaël Guilhem, Grégory Dupont
The present case study allowed an examination of the link between sleep and injury occurrence in an elite male soccer player competing in French League 1 and Union of European Football Associations matches. During 4 months, a mixed method approach was used, combining actigraphic sleep assessment with qualitative interviews on a daily basis. Three injuries were reported over the study period. Sleep onset latency, both in the single night (117±43 min) and in the week (78±50 min) before injury occurrence, was longer than pre-season baseline values (18±13 min; effect size (ES): 3...
September 11, 2017: Journal of Strength and Conditioning Research
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