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https://www.readbyqxmd.com/read/29780836/defining-platelet-rich-plasma-usage-by-team-physicians-in-elite-athletes
#1
David E Kantrowitz, Ajay S Padaki, Christopher S Ahmad, T Sean Lynch
Background: The indications for the use of platelet-rich plasma (PRP) are vaguely defined despite the frequency of its use as a treatment for athletes. While select studies have advocated for its efficacy, the majority of orthopaedic research conducted on the topic has been equivocal. Purpose: To define the use of PRP in elite athletes by team physicians from professional sports leagues. Study Design: Cross-sectional study. Methods: A survey assessing treatment timing, usage patterns, indications, and complications was generated by fellowship-trained sports medicine orthopaedic surgeons...
April 2018: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/29772188/hamstring-and-ankle-flexibility-deficits-are-weak-risk-factors-for-hamstring-injury-in-professional-soccer-players-a-prospective-cohort-study-of-438-players-including-78-injuries
#2
Nicol van Dyk, Abdulaziz Farooq, Roald Bahr, Erik Witvrouw
BACKGROUND: Hamstring injuries remain a significant injury burden in sports such as soccer that involve high-speed running. It has repeatedly been identified as the most common noncontact injury in elite male soccer, representing 12% of all injuries. As the incidence of hamstring injuries remains high, investigations are aimed at better understanding how to prevent hamstring injuries. Stretching to improve flexibility is commonly used in elite-level sports, but risk factor studies have reported contradicting results, leading to unclear conclusions regarding flexibility as a risk factor for hamstring injuries...
May 1, 2018: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/29769822/maturity-status-strongly-influences-the-relative-age-effect-in-international-elite-under-9-soccer
#3
Lisa Müller, Josef Gehmaier, Christoph Gonaus, Christian Raschner, Erich Müller
The aim of the study was to assess the role of the relative age effect (RAE) and to investigate the influence of the biological maturity status on the RAE in international under-9 soccer. The birth dates of 222 male participants of the U9 Eurochampionship Soccer Tournament in Vienna in 2016 were analyzed and divided into four relative age quarters (Q1-Q4) and the biological maturity status was assessed with the age at peak height velocity (APHV) method. Based on the mean±standard deviation of the APHV, the athletes were divided into three groups of maturity: early, normal and late maturing...
June 2018: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29746505/the-effects-of-short-term-detraining-and-retraining-on-physical-fitness-in-elite-soccer-players
#4
Chang Hwa Joo
PURPOSE: The aim of this study was to examine the effects of aerobic high-intensity training with reduced volume and training cessation on body composition and physical fitness after the end of season and the time required to recapture physical fitness with intensified retraining following two weeks of detraining in elite soccer players. METHOD: Twenty male semi-professional soccer players participated in this study. The soccer players were assigned to either a group that completed high-intensity aerobic training (HAT, n = 10) or to a detraining and retraining group (DHAT, n = 10) for a 5-week period immediately after the end of the season...
2018: PloS One
https://www.readbyqxmd.com/read/29746383/angle-specific-isokinetic-metrics-highlight-strength-training-needs-of-elite-youth-soccer-players
#5
Steven J Eustace, Richard M Page, Matt Greig
Eustace, SJ, Page, RM, and Greig, M. angle specific isokinetic metrics highlight strength training needs of elite youth soccer players. J Strength Cond Res XX(X): 000-000, 2018-The purpose of this study was to assess traditional and angle-specific isokinetic strength of eccentric knee flexors (eccKFs) and concentric knee extensors (conKEs) between senior professional and youth soccer players. Thirty-four male soccer players (17 senior and 17 youth) were recruited for bilateral assessments at 180, 270, and 60°·s...
May 2, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29739301/sub-elite-football-players-with-hip-related-groin-pain-and-positive-flexion-adduction-internal-rotation-test-exhibit-distinct-biomechanical-differences-compared-with-the-asymptomatic-side
#6
Matthew G King, Adam I Semciw, Harvi F Hart, Anthony G Schache, Kane J Middleton, Josh J Heerey, Rintje Agricola, Kay M Crossley
Study Design Observational cross-sectional study. Background Hip-related groin pain is common in sub-elite football players and may be associated with altered hip biomechanics. Objectives To compare the hip biomechanics, bony hip morphology associated with femoroacetabular impingement (FAI) syndrome, and hip strength and range of motion between the symptomatic and asymptomatic limb of sub-elite football players with unilateral hip-related groin pain and a positive flexion adduction internal rotation test. Methods Fifteen sub-elite football (soccer) players with unilateral hip-related groin pain and a positive flexion adduction internal rotation test were recruited...
May 8, 2018: Journal of Orthopaedic and Sports Physical Therapy
https://www.readbyqxmd.com/read/29723200/longitudinal-motor-performance-development-in-early-adolescence-and-its-relationship-to-adult-success-an-8-year-prospective-study-of-highly-talented-soccer-players
#7
Daniel Leyhr, Augustin Kelava, Johannes Raabe, Oliver Höner
Several talent identification and development (TID) programs in soccer have implemented diagnostics to measure players' motor performance. Yet, there is a lack of research investigating the relationship between motor development in adolescence and future, adult performance. This longitudinal study analyzed the three-year development of highly talented young soccer players' speed abilities and technical skills and examined the relevance of this development to their adult success. The current research sample consisted of N = 1,134 players born between 1993 and 1995 who were selected for the German Soccer Association's TID program and participated in nationwide motor diagnostics (sprinting, agility, dribbling, ball control, shooting) four times between the Under 12 (U12) and Under 15 (U15) age class...
2018: PloS One
https://www.readbyqxmd.com/read/29721459/differences-between-the-sexes-in-athletes-body-composition-and-lower-limb-bioimpedance-values
#8
Gabriele Mascherini, Jorge Castizo-Olier, Alfredo Irurtia, Cristian Petri, Giorgio Galanti
Introduction: The differences between the sexes in body composition are well established, although sports activity at an elite level seems to reduce them. The aim of this study is a comparison of the sexes in terms of athletes' body composition with a three-compartment model and a localized bioimpedance analysis in elite soccer players. Methods: 18 female and 18 male elite soccer players of the same age were matched (female=26.2±2.4, male 26.9±2.5; p=0.87). An assessment of body composition was performed through the integration of anthropometrics parameters, skinfold thickness and bioimpedance data...
October 2017: Muscles, Ligaments and Tendons Journal
https://www.readbyqxmd.com/read/29693423/landing-kinematics-in-elite-male-youth-soccer-players-of-different-chronologic-age-and-stage-of-maturation
#9
Paul J Read, Jon L Oliver, Mark B A De Ste Croix, Gregory D Myer, Rhodri S Lloyd
CONTEXT:   Despite the high frequency of knee injuries in athletes, few researchers have studied the effects of chronologic age and stage of maturation on knee-joint kinematics in male youth soccer players. OBJECTIVE:   To use a coach-friendly screening tool to examine knee-valgus scores for players of different ages and at different stages of maturation. DESIGN:   Cross-sectional study. SETTING:   Academy soccer clubs...
April 25, 2018: Journal of Athletic Training
https://www.readbyqxmd.com/read/29688115/monitoring-players-readiness-using-predicted-heart-rate-responses-to-football-drills
#10
Mathieu Lacome, Ben Simpson, Nick Broad, Martin Buchheit
PURPOSE: To examine the ability of multivariate models to predict the HR responses to some specific training drills from various GPS variables and to examine the usefulness of the difference in predicted vs actual HR responses as an index of fitness or readiness to perform. METHOD: All data were collected during one season (2016-2017) with players' soccer activity recorded using 5-Hz GPS and internal load monitored using heart rate (HR). GPS and HR data were analysed during typical small-sided games and a 4-min standardized submaximal run (12 km/h)...
April 24, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29686814/an-innovative-way-to-highlight-the-power-of-each-polymorphism-on-elite-athletes-phenotype-expression
#11
Valentina Contrò, Gabriella Schiera, Antonino Abbruzzo, Antonino Bianco, Alessandra Amato, Alessia Sacco, Alessandra Macchiarella, Antonio Palma, Patrizia Proia
The purpose of this study was to determine the probability of soccer players having the best genetic background that could increase performance, evaluating the polymorphism that are considered Performance Enhancing Polymorphism (PEPs) distributed on five genes: PPARα, PPARGC1A, NRF2, ACE e CKMM. Particularly, we investigated how each polymorphism works directly or through another polymorphism to distinguish elite athletes from non-athletic population. Sixty professional soccer players (age 22.5 ± 2.2) and sixty healthy volunteers (age 21...
January 12, 2018: European Journal of Translational Myology
https://www.readbyqxmd.com/read/29672644/the-relative-age-effect-is-larger-in-italian-soccer-top-level-youth-categories-and-smaller-in-serie-a
#12
Paolo Riccardo Brustio, Corrado Lupo, Alexandru Nicolae Ungureanu, Riccardo Frati, Alberto Rainoldi, Gennaro Boccia
The relative age effect (RAE; i.e., an asymmetry in the birth distribution) is a bias observed in sport competitions that may favour relatively older athletes in talent identification. Therefore, the aim of this study was to investigate the presence of RAE in elite soccer players competing in the Italian championships, even considering the discriminations of younger and older Serie A players (in relation to the median age of the sample), and different positional roles (i.e., goalkeeper, defender, midfielder, forward) for each observed category...
2018: PloS One
https://www.readbyqxmd.com/read/29652679/comparison-of-static-and-dynamic-balance-at-different-levels-of-sport-competition-in-professional-and-junior-elite-soccer-players
#13
Łukasz Jadczak, Monika Grygorowicz, Witold Dzudziński, Robert Śliwowski
Jadczak, Ł, Grygorowicz, M, Dzudziński, W, and Śliwowski, R. Comparison of static and dynamic balance at different levels of sport competition in professional and junior elite soccer players. J Strength Cond Res XX(X): 000-000, 2018-The purpose of this study was to compare body balance control and balance recovery strategies of professional football players, representing various sports levels in static (eyes open, eyes closed) and dynamic conditions, both on the dominant and nondominant leg. Three groups of professional and junior elite soccer players were investigated: a PRO group (n = 52), a U-21 group (n = 55), and a U-19 group (n = 47)...
April 12, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29628898/postactivation-potentiation-of-the-plantar-flexors-does-not-directly-translate-to-jump-performance-in-female-elite-young-soccer-players
#14
Olaf Prieske, Nicola A Maffiuletti, Urs Granacher
High-intensity muscle actions have the potential to temporarily improve muscle contractile properties (i.e., postactivation potentiation, PAP) thereby inducing acute performance enhancements. There is evidence that balance training can improve performance during strength exercises. Taking these findings together, the purpose of this study was to examine the acute effects of a combined balance and strength (B+S) exercise vs. a strength only (S) exercise on twitch contractile properties, maximum voluntary strength, and jump performance in young athletes...
2018: Frontiers in Physiology
https://www.readbyqxmd.com/read/29625360/correlation-between-quadriceps-and-hamstrings-inter-limb-strength-asymmetry-with-change-of-direction-and-sprint-in-u21-elite-soccer-players
#15
Giuseppe Coratella, Marco Beato, Federico Schena
The aim of this study was to investigate the relationship between in quadriceps and hamstrings inter-limb strength asymmetry and change of direction, sprinting and jumping abilities in U21 elite soccer players. Twenty-seven soccer players volunteered for this study. Isokinetic quadriceps and hamstrings peak torque was measured at high and low angular velocities, both in concentric and eccentric modalities. Performance in agility T-test, 20 + 20 m shuttle-test, 10 m and 30 m sprint, squat jump (SJ) and counter-movement jump (CMJ), were measured...
April 3, 2018: Human Movement Science
https://www.readbyqxmd.com/read/29601106/skin-temperature-in-youth-soccer-players-with-functional-equinus-and-non-equinus-condition-after-running
#16
David Rodriguez Sanz, Marta Elena Losa Iglesias, Ricardo Becerro de Bengoa Vallejo, Patricia Palomo Lopez, Hector Beltran Alacreu, Cesar Calvo Lobo, Emmanuel Navarro Flores, Daniel Lopez Lopez
OBJECTIVES: To check how a thermal-IR camera can check skin temperature in Gastrocnemius-soleus Equinus condition and Non-Gastrocnemius-Soleus condition in youth soccer players and thus detect association between the extensibility of the triceps-surae (with Gastrocnemius-Soleus Equinus and Non-Gastrocnemius-Soleus Equinus) and the muscle temperature pattern. DESIGN: A Cross Sectional Study Secundary level of care. METHODS: Sample from an elite soccer academy in Madrid (Spain) 35 healthy male subjects (youth soccer-players) age 12...
March 30, 2018: Journal of the European Academy of Dermatology and Venereology: JEADV
https://www.readbyqxmd.com/read/29599873/physical-performance-comparison-between-under-15-elite-and-sub-elite-soccer-players
#17
Athos Trecroci, Zoran Milanović, Matteo Frontini, F Marcello Iaia, Giampietro Alberti
The aim of this study was to compare the physical performance profile among young soccer players of different competitive levels. Two teams of elite (n = 22) and sub-elite (n = 22) soccer players at national (highly skilled) and regional (moderately skilled) level were recruited in the study. All participants were tested using a modified Illinois change of direction speed test, a T-drill with and without a ball, a countermovement jump, and a 10-m sprint. The analysis revealed significant differences in favor of elite players in sprint (d = 1...
March 2018: Journal of Human Kinetics
https://www.readbyqxmd.com/read/29599867/variance-in-prominence-levels-and-in-patterns-of-passing-sequences-in-elite-and-youth-soccer-players-a-network-approach
#18
Bruno Mendes, Filipe Manuel Clemente, Nuno Maurício
The aim of this study was to quantify the prominence levels of elite and highly competitive young soccer players. This study also analyzed the variation in general network properties at different competitive levels and periods of the season. A total of 132 matches, played by 28 teams during the 2015/2016 season, were analyzed. The results revealed significant differences in the composition of general network measures considering the competitive level (p = 0.002; ES = 0.077) and according to the location of the match (p = 0...
March 2018: Journal of Human Kinetics
https://www.readbyqxmd.com/read/29599121/-what-s-my-risk-of-sustaining-an-acl-injury-while-playing-football-soccer-a-systematic-review-with-meta-analysis
#19
REVIEW
Alicia M Montalvo, Daniel K Schneider, Paula L Silva, Laura Yut, Kate E Webster, Michael A Riley, Adam W Kiefer, Jennifer L Doherty-Restrepo, Gregory D Myer
OBJECTIVE: To estimate the incidence proportion (IP) and incidence rate (IR) of ACL injury in football players. DESIGN: Systematic review with meta-analysis. DATA SOURCES: PubMed, CINAHL and SPORTDiscus electronic databases were searched from inception to 20 January 2017. ELIGIBILITY CRITERIA FOR SELECTING STUDY: Studies that reported the total number of participants/population by sex, total number of ACL injuries by sex and total person-time by sex were included...
March 29, 2018: British Journal of Sports Medicine
https://www.readbyqxmd.com/read/29570576/the-effect-of-match-factors-on-the-running-performance-of-elite-female-soccer-players
#20
Joshua Trewin, César Meylan, Matthew C Varley, John Cronin, Daphne Ling
The purpose of this study was to examine the effects of match-factors on the match-running of elite female soccer players. Players from the same women's national team (n = 45) were monitored during 47 international fixtures (files = 606) across four years (2012-2015) using 10-Hz global positioning system devices. A mixed model was used to analyse the effects of altitude, temperature, match-outcome, opposition ranking and congested schedules. At altitude (>500 m) a small increase in the number of accelerations (ES = 0...
March 22, 2018: Journal of Strength and Conditioning Research
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