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https://www.readbyqxmd.com/read/29781940/alpha-actinin-3-r577x-polymorphism-influences-muscle-damage-and-hormonal-responses-after-a-soccer-game
#1
Daniel B Coelho, Eduardo M Pimenta, Izinara C Rosse, Christiano Veneroso, Guilherme De Azambuja Pussieldi, Lenice K Becker, Emerson C Oliveira, Maria R S Carvalho, Emerson Silami-Garcia
Coelho, DB, Pimenta, EM, Rosse, IC, Veneroso, C, Pussieldi, GDA, Becker, LK, De Oliveira, EC, Carvalho, MRS, and Silami-Garcia, E. Alpha-actinin-3 R577X polymorphism influences muscle damage and hormonal responses after a soccer game. J Strength Cond Res XX(X): 000-000, 2018-The purpose of this study was to evaluate indicators of muscle damage and hormonal responses after soccer matches and its relation to alpha-actinin-3 (ACTN3) gene expression (XX vs. RR/RX), considering that the R allele produces alpha-actinin-3 and provides greater muscle strength and power...
May 17, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29780846/epidemiology-of-hip-and-groin-injuries-in-collegiate-athletes-in-the-united-states
#2
Yehuda E Kerbel, Christopher M Smith, John P Prodromo, Michael I Nzeogu, Mary K Mulcahey
Background: Hip and groin pain is a common complaint among athletes. Few studies have examined the epidemiology of hip and groin injuries in collegiate athletes across multiple sports. Purpose: To describe the rates, mechanisms, sex-based differences, and severity of hip/groin injuries across 25 collegiate sports. Study Design: Descriptive epidemiology study. Methods: Data from the 2009-2010 through 2013-2014 academic years were obtained from the National Collegiate Athletic Association Injury Surveillance Program (NCAA ISP)...
May 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
#3
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/29758569/relation-between-iliopsoas-cross-sectional-area-and-kicked-ball-speed-in-soccer-players
#4
Taku Wakahara, Manabu Chiba
This study aimed to investigate the relationship between the maximal anatomical cross-sectional area (ACSA) of the iliopsoas muscle and ball speed in side-foot and instep kicks. The ACSA of the psoas major and iliacus was measured in 29 male collegiate soccer players by using magnetic resonance imaging. They performed maximal side-foot and instep kicks to a stationary ball. The kicked ball speed was measured with a high-speed camera. Ball speed in the side-foot and instep kicks was significantly correlated with body height (side-foot kick: r=0...
May 14, 2018: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/29745785/dose-response-relationship-between-training-load-and-changes-in-aerobic-fitness-in-professional-youth-soccer-players
#5
John F Fitzpatrick, Kirsty M Hicks, Philip R Hayes
PURPOSE: The aim of this study was to compare the dose-response relationship between, traditional arbitrary speed thresholds versus an individualised approach, with changes in aerobic fitness in professional youth soccer players. METHODS: Fourteen youth soccer players, completed a 1500 metre time trial to estimate maximal aerobic speed (km.h-1 , (MAS)) at the start and the end of a six week period. Training load was monitored on a daily basis during this study. External load measures were; total distance covered (TD), total acceleration and deceleration distance > 2m...
May 10, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29742748/planning-training-workload-in-football-using-small-sided-games-density
#6
Sebastien Sangnier, Thierry Cotte, Olivier Brachet, Jeremy Coquart, Claire Tourny
Sangnier, S, Cotte, T, Brachet, O, Coquart, J, and Tourny, C. Planning training workload in football using small-sided games density. J Strength Cond Res XX(X): 000-000, 2018-To develop the physical qualities, the small-sided games' (SSGs) density may be essential in soccer. Small-sided games are games in which the pitch size, players' number, and rules are different to those for traditional soccer matches. The purpose was to assess the relation between training workload and SSGs' density. The 33 densities data (41 practice games and 3 full games) were analyzed through global positioning system (GPS) data collected from 25 professional soccer players (80...
May 8, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29740560/comparison-of-technical-and-physical-activities-between-8-vs-8-and-11-vs-11-games-in-young-korean-soccer-players
#7
Seong Hwan Oh, Chang Hwa Joo
The aims of this study were to examine the differences in technical aspects and physical demands between small-size games (SSG; 8 vs. 8) and regular-size games (RSG; 11 vs. 11) in young Korean soccer players. Seventy-nine young soccer players from 6 teams (U-12) volunteered to participate in the study. The players completed 4 games (2 SSG, 62×51 m, and 2 RSG, 80×54 m) in 2 days. Each game was filmed to evaluate technical actions. Physical demand variables were measured using global positioning system technology...
April 2018: Journal of Exercise Rehabilitation
https://www.readbyqxmd.com/read/29740384/heading-frequency-is-more-strongly-related-to-cognitive-performance-than-unintentional-head-impacts-in-amateur-soccer-players
#8
Walter F Stewart, Namhee Kim, Chloe Ifrah, Martin Sliwinski, Molly E Zimmerman, Mimi Kim, Richard B Lipton, Michael L Lipton
Objective: Compared to heading, unintentional head impacts (e.g., elbow to head, head to head, head to goalpost) in soccer are more strongly related to risk of moderate to very severe Central Nervous System (CNS) symptoms. But, most head impacts associated with CNS symptoms that occur in soccer are mild and are more strongly related to heading. We tested for a differential relation of heading and unintentional head impacts with neuropsychological (NP) test performance. Method: Active adult amateur soccer players were recruited in New York City and the surrounding areas for this repeated measures longitudinal study of individuals who were enrolled if they had 5+ years of soccer play and were active playing soccer 6+ months/year...
2018: Frontiers in Neurology
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
#9
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/29702518/team-dynamics-running-and-skill-related-performances-of-brazilian-u11-to-professional-soccer-players-during-official-matches
#10
Luiz H Palucci Vieira, Rodrigo Aquino, Felipe A Moura, Ricardo M L de Barros, Vitor M Arpini, Lucas P Oliveira, Bruno L S Bedo, Paulo R P Santiago
Palucci Vieira, LH, Aquino, R, Moura, FA, Barros, RMLd, Arpini, VM, Oliveira, LdP, Bedo, BLdS, and Pereira Santiago, PR. Team dynamics, running, and skill-related performances of Brazilian U11 to professional soccer players during official matches. J Strength Cond Res XX(X): 000-000, 2018-Analyses of movements during soccer competition have been used previously to help develop conditioning programs. However, this has not been extensively studied in youth populations. Therefore, the purposes of this study were to examine (1) dynamics of collective tactical movements, (2) running, and (3) skill-related performances during soccer matches disputed by children to senior players...
April 26, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29702517/assessing-repeated-sprint-ability-in-division-i-collegiate-women-soccer-players
#11
Robert G Lockie, Tricia M Liu, Alyssa A Stage, Adrina Lazar, Dominic V Giuliano, Jillian M Hurley, Ibett A Torne, Megan D Beiley, Samantha A Birmingham-Babauta, John J Stokes, Fabrice G Risso, DeShaun L Davis, Matthew R Moreno, Ashley J Orjalo
Lockie, RG, Liu, TM, Stage, AA, Lazar, A, Giuliano, DV, Hurley, JM, Torne, IA, Beiley, MD, Birmingham-Babauta, SA, Stokes, JJ, Risso, FG, Davis, DL, Moreno, MR, and Orjalo, AJ. Assessing repeated-sprint ability in Division I collegiate women soccer players. J Strength Cond Res XX(X): 000-000, 2018-Repeated-sprint ability (RSA) is a key component of soccer, and is the capacity to repeatedly produce near-maximal to maximal sprints with short recovery periods. Repeated-sprint ability has received little analysis in collegiate women soccer players...
April 26, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29697215/variability-of-activity-profile-during-medium-sided-games-in-professional-soccer
#12
Vincenzo Rago, João R Silva, Magni Mohr, Daniel Barreira, Peter Krustrup, António N Rebelo
BACKGROUND: In Southern European countries it is very frequent to perform medium-sized games (MSG) as last training drill. We analyzed the individual variability and changes in activity patterns during MSG throughout the preseason. METHODS: Activity profile during MSGs (10v10+goalkeepers, duration: 10-min, field length: 50 m, width: 90 m, area per player: 204.5 m2) was quantified using a GPS in 14 professional male players (6 defenders, 5 midfielders 5 and attackers)...
April 24, 2018: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/29693567/optical-and-acoustic-sensor-based-3d-ball-motion-estimation-for-ball-sport-simulators-%C3%A2
#13
Sang-Woo Seo, Myunggyu Kim, Yejin Kim
Estimation of the motion of ball-shaped objects is essential for the operation of ball sport simulators. In this paper, we propose an estimation system for 3D ball motion, including speed and angle of projection, by using acoustic vector and infrared (IR) scanning sensors. Our system is comprised of three steps to estimate a ball motion: sound-based ball firing detection, sound source localization, and IR scanning for motion analysis. First, an impulsive sound classification based on the mel-frequency cepstrum and feed-forward neural network is introduced to detect the ball launch sound...
April 25, 2018: Sensors
https://www.readbyqxmd.com/read/29621015/hamstring-muscle-injury-prediction-by-isokinetic-ratios-depends-on-the-method-used
#14
Marc Dauty, Pierre Menu, Alban Fouasson-Chailloux
OBJECTIVES: Hamstring muscle injury prediction by isokinetic strength ratios is low but could result from the method-depending either on the use of the limbs or of the sportsmen as references. We aimed to establish a predictive model including unilateral and bilateral ratios calculated from the dominant, nondominant, right, and left limb in injured and uninjured professional soccer players. DESIGN: Cohort study. SETTING: Soccer team of the French Professional Premier League...
April 4, 2018: Clinical Journal of Sport Medicine: Official Journal of the Canadian Academy of Sport Medicine
https://www.readbyqxmd.com/read/29599873/physical-performance-comparison-between-under-15-elite-and-sub-elite-soccer-players
#15
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/29599871/effects-of-different-post-activation-potentiation-warm-ups-on-repeated-sprint-ability-in-soccer-players-from-different-competitive-levels
#16
Javier Sanchez-Sanchez, Alejandro Rodriguez, Cristina Petisco, Rodrigo Ramirez-Campillo, Cristian Martínez, Fábio Y Nakamura
This study aimed to compare the effects of a traditional warm-up with two post-activation potentiation (PAP) warm-up strategies on the repeated sprint ability (RSA) of soccer players from national (NL) and regional (RL) competitive levels. Sixteen young players (NL, n = 8, age = 20.7 ± 1.4 y, body mass = 68.5 ± 7.0 kg, body height = 177.4 ± 5.2 cm; RL, n = 8, age = 20.8 ± 1.0 y, body mass = 68.7 ± 4.0 kg, body height = 176.6 ± 5.6 cm) were recruited to complete a traditional warm-up (CONTROL), a PAP warm-up incorporating squats with a load (~60% 1RM) that allowed a high speed (1 m/s) of movement and a high number of repetitions (PAP-1), and a PAP warm-up with a load (~90% 1RM) that allowed a moderate speed (0...
March 2018: Journal of Human Kinetics
https://www.readbyqxmd.com/read/29594958/change-of-direction-speed-toward-a-strength-training-approach-with-accentuated-eccentric-muscle-actions
#17
Helmi Chaabene, Olaf Prieske, Yassine Negra, Urs Granacher
There is growing evidence that eccentric strength training appears to have benefits over traditional strength training (i.e., strength training with combined concentric and eccentric muscle actions) from muscular, neuromuscular, tendinous, and metabolic perspectives. Eccentric muscle strength is particularly needed to decelerate and stabilize the body during the braking phase of a jump exercise or during rapid changes of direction (CoD) tasks. However, surprisingly little research has been conducted to elucidate the effects of eccentric strength training or strength training with accentuated eccentric muscle actions on CoD speed performance...
March 28, 2018: Sports Medicine
https://www.readbyqxmd.com/read/29580692/modeling-the-two-dimensional-accuracy-of-soccer-kicks
#18
Andrew H Hunter, Michael J Angilletta, Theodore Pavlic, Glen Lichtwark, Robbie S Wilson
In many sports, athletes perform motor tasks that simultaneously require both speed and accuracy for success, such as kicking a ball. Because of the biomechanical trade-off between speed and accuracy, athletes must balance these competing demands. Modelling the optimal compromise between speed and accuracy requires one to quantifyhow task speed affects the dispersion around a target, a level of experimental detail not previously addressed. Using soccer penalties as a system, we measured two-dimensional kicking error over a range of speeds, target heights, and kicking techniques...
March 13, 2018: Journal of Biomechanics
https://www.readbyqxmd.com/read/29570576/the-effect-of-match-factors-on-the-running-performance-of-elite-female-soccer-players
#19
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
https://www.readbyqxmd.com/read/29570574/sequencing-effects-of-plyometric-training-applied-before-or-after-regular-soccer-training-on-measures-of-physical-fitness-in-young-players
#20
Rodrigo Ramirez-Campillo, Cristian Alvarez, Paulo Gentil, Irineu Loturco, Javier Sanchez-Sanchez, Mikel Izquierdo, Jason Moran, Fabio Y Nakamura, Helmi Chaabene, Urs Granacher
To compare the effects of short-term (i.e., 7 week) plyometric training applied before (PJT-B) or after (PJT-A) soccer practice on components of physical fitness in young soccer players, a single-blind randomized controlled trial was conducted. Post-pubertal boys aged 17.0±0.5 years were allocated to three groups: PJT-B (n=12), PJT-A (n=14), and control (CON; n=12). The outcome measures included tests to evaluate 20-m speed, standing long jump [SLJ], squat jump [SJ], countermovement jump [CMJ], and drop jump [DJ], 20-m multistage shuttle running speed [MSSRT], and Illinois change of direction speed [ICODT]...
March 22, 2018: Journal of Strength and Conditioning Research
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