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https://www.readbyqxmd.com/read/29150270/m-biceps-femoris-a-wolf-in-sheep-s-clothing-the-downside-of-a-lower-limb-injury-prevention-training
#1
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/29140913/sex-differences-in-aerobic-fitness-in-top-class-soccer-referees
#2
Carlo Castagna, Mario Bizzini, Stefano DʼOttavio, Susana C Araújo Póvoas
Castagna, C, Bizzini, M, D'Ottavio, S, and Araújo Póvoas, SC. Gender differences in aerobic fitness in top-class soccer referees. J Strength Cond Res XX(X): 000-000, 2017-The aim of this study was to assess the aerobic-fitness differences between male and female top-class soccer field referees (FRs). This with the purpose to provide cutoff values useful for training prescription in female FRs. Forty female top-class FRs (age 34.18 ± 3.50 years and 5 ± 3.9 years international refereeing experience) and 52 male FRs (age 38...
November 14, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29133819/low-perceptual-sensitivity-to-altered-video-speed-in-viewing-a-soccer-match
#3
Claudio de'Sperati, Gabriel Baud Bovy
When watching videos, our sense of reality is continuously challenged. How much can a fundamental dimension of experience such as visual flow be modified before breaking the perception of real time? Here we found a remarkable indifference to speed manipulations applied to a popular video content, a soccer match. In a condition that mimicked real-life TV watching, none of 100 naïve observers spontaneously noticed speed alterations up/down to 12%, even when asked to report motion anomalies, and showed very low sensitivity to video speed changes (Just Noticeable Difference, JND = 18%)...
November 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29132263/movement-pattern-and-physiological-response-in-recreational-small-sided-football-effect-of-number-of-players-with-a-fixed-pitch-size
#4
Morten B Randers, Christina Ørntoft, Marie Hagman, Jens J Nielsen, Peter Krustrup
Recreational soccer is an effective health-promoting activity, but it is unclear how different game formats influence internal and external load. Thus, to be able to advise how to maximise the outcome of recreational football, we examined movement pattern and physiological response in 11 untrained men (32.6 ± 6.7 yrs, 23.3 ± 4.9 fat%, 43.4 ± 5.3 ml·min(-1)·kg(-1)) during three football sessions comprising 4 × 12 min of 3v3, 5v5 or 7v7 with a constant pitch size of 20 × 40 m. Movement pattern, heart rate (HR), blood lactate and RPE were measured during and after the 12-min periods...
November 13, 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/29083126/exercise-to-rest-ratios-in-rsa-training-in-women-s-soccer
#6
Bruno Ruscello, Mario Esposito, Filippo Partipilo, Dalila DI Cicco, Cristoforo Filetti, Laura Pantanella, Stefano D'Ottavio
BACKGROUND: To investigate the applicability of three different exercise to rest ratios in RSA training in women's soccer players, applying those ones already adopted in male adult and young players, when performing three different sprinting modes (straight, shuttle and sprinting with changing of direction). METHODS: 15 trained female soccer players (height: 1.65 ± 0.06 m; weight: 59.3 ± 9.0 kg; BMI 21.6 ± 2.7 kg·m-2; age: 23.3±5.9 years) participated to the study...
October 27, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/29079295/examination-of-the-external-and-internal-load-indicators-association-with-overuse-injuries-in-professional-soccer-players
#7
Arne Jaspers, Jurian P Kuyvenhoven, Filip Staes, Wouter G P Frencken, Werner F Helsen, Michel S Brink
OBJECTIVES: Research in professional soccer focusing on the relevance of external and internal load indicators for injury prevention is scarce. This study examined the relationship between load indicators and overuse injuries. DESIGN: Prospective cohort study. METHODS: Data were collected from 35 professional male soccer players over two seasons. Following load indicators were examined: total distance covered (TD), distance covered at high speed (THSR; >20kmh(-1)), number of accelerations (ACCeff; >1ms(-2)), number of decelerations (DECeff; <-1ms(-2)), and rating of perceived exertion (RPE) multiplied by duration...
October 13, 2017: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/29045314/repeated-sprint-ability-in-division-i-collegiate-male-soccer-players-positional-differences-and-relationships-with-performance-tests
#8
Robert G Lockie, Matthew R Moreno, Ashley J Orjalo, Alyssa A Stage, Tricia M Liu, Samantha A Birmingham-Babauta, Jillian M Hurley, Ibett A Torne, Megan D Beiley, Fabrice G Risso, DeShaun L Davis, Adrina Lazar, John J Stokes, Dominic V Giuliano
Repeated-sprint ability (RSA) in essential for soccer. Important considerations when assessing RSA is whether there are differences between positions (defenders, midfielders, forwards), and what physiological characteristics may contribute to RSA. This has not been assessed in collegiate male players. Eighteen Division I male field players from one school performed several performance tests. The RSA test involved 7 x 30-m sprints completed on 20-s cycles. Measurements included total time (TT), and performance decrement (percent change in time from the first to last sprint; PD)...
October 16, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29023331/effects-of-plyometric-training-on-components-of-physical-fitness-in-prepuberal-male-soccer-athletes-the-role-of-surface-instability
#9
Yassine Negra, Helmi Chaabene, Senda Sammoud, Raja Bouguezzi, Bessem Mkaouer, Younés Hachana, Urs Granacher
Negra, Y, Chaabene, H, Sammoud, S, Bouguezzi, R, Mkaouer, B, Hachana, Y, and Granacher, U. Effects of plyometric training on components of physical fitness in prepuberal male soccer athletes: the role of surface instability. J Strength Cond Res XX(X): 000-000, 2017-Previous studies contrasted the effects of plyometric training (PT) conducted on stable vs. unstable surfaces on components of physical fitness in child and adolescent soccer players. Depending on the training modality (stable vs. unstable), specific performance improvements were found for jump (stable PT) and balance performances (unstable PT)...
October 10, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29023329/living-and-training-at-825m-for-8-weeks-supplemented-with-intermittent-hypoxic-training-at-3000m-improves-blood-parameters-and-running-performance
#10
Preetiwat Wonnabussapawich, Michael J Hamlin, Catherine A Lizamore, Nuttaset Manimmanakorn, Naruemon Leelayuwat, Orathai Tunkamnerdthai, Worrawut Thuwakum, Apiwan Manimmanakorn
We aimed to investigate the effect of an 8-week low-altitude training block supplemented with intermittent hypoxic training, on blood and performance parameters in soccer players. Forty university-level male soccer players were separated into altitude (n = 20, 825m) or sea level (n = 20, 125m) groups. Before (1-2 days prior) and after (1 and 14 days post) training, players were asked to give a resting venous blood sample and complete a series of performance tests. Compared to sea level, the altitude group increased erythropoietin, red cell count and hematocrit 1 day post training (42...
October 10, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29018362/effects-of-unloaded-vs-loaded-plyometrics-on-speed-and-power-performance-of-elite-young-soccer-players
#11
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/28983273/mental-fatigue-and-spatial-references-impair-soccer-players-physical-and-tactical-performances
#12
Diogo Coutinho, Bruno Gonçalves, Bruno Travassos, Del P Wong, Aaron J Coutts, Jaime E Sampaio
This study examined the effects of mental fatigue and additional corridor and pitch sector lines on players' physical and tactical performances during soccer small-sided games. Twelve youth players performed four Gk+6vs6+Gk small-sided games. Prior to the game, one team performed a motor coordination task to induce mental fatigue, while the other one performed a control task. A repeated measures design allowed to compare players' performances across four conditions: (a) with mental fatigue against opponents without mental fatigue in a normal pitch (MEN), (b) with mental fatigue on a pitch with additional reference lines (#MEN); (c) without mental fatigue against mentally fatigued opponents on a normal pitch (CTR); and (d) without mental fatigue on a pitch with reference lines (#CTR)...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28964690/maturation-related-adaptations-in-running-speed-in-response-to-sprint-training-in-youth-soccer-players
#13
Jason Moran, Dave A Parry, Ieuan Lewis, Jay Collison, Michael C Rumpf, Gavin R H Sandercock
OBJECTIVES: This study investigated the effects of a previously recommended dose of sprint training (ST) in young male soccer players of differing maturity status. DESIGN: Quasi-experimental design. METHODS: Male soccer players from two professional academies were divided into Pre-PHV (Training: n=12; Control: n=13) and Mid-PHV (Training: n=7; Control=10) groups. The training groups completed 16 sprints of 20m with 90s recovery, once per week...
September 21, 2017: Journal of Science and Medicine in Sport
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
#14
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
#15
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/28944649/neuromuscular-responses-and-physiological-patterns-during-a-soccer-simulation-protocol-artificial-turf-versus-natural-grass
#16
Jorge López-Fernández, Jorge García-Unanue, Javier Sánchez-Sánchez, Manuel León, Enrique Hernando, Leonor Gallardo
BACKGROUND: Latest studies suggest similar performance of soccer players either on artificial turf (AT) or natural grass (NG). However, it is not clear if their muscular and physiological responses are also similar on both surfaces. This research aims to assess the influence of game surface on physiological patterns and neuromuscular responses of soccer players during a soccer simulation protocol (SSP) that incorporates repeated sprints and nonlinear actions at maximum speed. METHODS: Sixteen amateur soccer players completed three bouts of the SSP on both AT and NG...
September 22, 2017: Journal of Sports Medicine and Physical Fitness
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/28922682/the-energy-cost-of-running-with-the-ball-in-soccer
#18
Alessandro Piras, Milena Raffi, Charalampos Atmatzidis, Franco Merni, Rocco Di Michele
Running with the ball is a soccer-specific activity frequently used by players during match play and training drills. Nevertheless, the energy cost (EC) of on-grass running with the ball has not yet been determined. The purpose of this study was therefore to assess the EC of constant-speed running with the ball, and to compare it with the EC of normal running. Eight amateur soccer players performed two 6- min runs at 10 km/h on artificial turf, respectively with and without the ball. EC was measured with indirect calorimetry and, furthermore, estimated with a method based on players' accelerations measured with a GPS receiver...
November 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28894427/hypernetworks-reveal-compound-variables-that-capture-cooperative-and-competitive-interactions-in-a-soccer-match
#19
João Ramos, Rui J Lopes, Pedro Marques, Duarte Araújo
The combination of sports sciences theorization and social networks analysis (SNA) has offered useful new insights for addressing team behavior. However, SNA typically represents the dynamics of team behavior during a match in dyadic interactions and in a single cumulative snapshot. This study aims to overcome these limitations by using hypernetworks to describe illustrative cases of team behavior dynamics at various other levels of analyses. Hypernetworks simultaneously access cooperative and competitive interactions between teammates and opponents across space and time during a match...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28872370/neuromuscular-responses-to-conditioned-soccer-sessions-assessed-via-gps-embedded-accelerometers-insights-into-tactical-periodization
#20
Martin Buchheit, Mathieu Lacome, Yannick Cholley, Ben M Simpson
PURPOSE: To 1) examine the reliability of field-based running-specific measures of neuromuscular function assessed via GPS-embedded accelerometers and 2) examine their responses to three typical conditioned sessions (i.e., Strength, Endurance and Speed) in elite soccer players. METHODS: Before and immediately after each session, vertical jump (CMJ) and adductors squeeze strength (Groin) performances were recorded. Players also performed a 4-min run at 12 km/h followed by 4 ~60-m runs (run =12 s, r =33 s)...
September 5, 2017: International Journal of Sports Physiology and Performance
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