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https://www.readbyqxmd.com/read/28922682/the-energy-cost-of-running-with-the-ball-in-soccer
#1
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...
September 18, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28922490/risk-factors-for-football-injuries-in-young-players-aged-7-to-12-years
#2
Roland Rössler, Astrid Junge, Jiri Chomiak, Karel Němec, Jiri Dvorak, Eric Lichtenstein, Oliver Faude
OBJECTIVES: Football (soccer) is very popular amongst children. Little is known about risk factors for football injuries in children. The aim was to analyse potential injury risk factors in 7 to 12 year old players. DESIGN: Prospective epidemiological study. METHODS: We collected prospective data in Switzerland and the Czech Republic over two seasons. Coaches reported exposure of players (in hours), absence, and injury data via an internet-based registration system...
September 18, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28919844/practical-nutritional-recovery-strategies-for-elite-soccer-players-when-limited-time-separates-repeated-matches
#3
REVIEW
Mayur Krachna Ranchordas, Joel T Dawson, Mark Russell
Specific guidelines that aim to facilitate the recovery of soccer players from the demands of training and a congested fixture schedule are lacking; especially in relation to evidence-based nutritional recommendations. The importance of repeated high level performance and injury avoidance while addressing the challenges of fixture scheduling, travel to away venues, and training commitments requires a strategic and practically feasible method of implementing specific nutritional strategies. Here we present evidence-based guidelines regarding nutritional recovery strategies within the context of soccer...
2017: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/28904982/preseason-aerobic-fitness-predicts-in-season-injury-and-illness-in-female-youth-athletes
#4
Andrew Watson, Stacey Brickson, M Alison Brooks, Warren Dunn
BACKGROUND: Although preseason aerobic fitness has been suggested as a modifiable risk factor for injury in adult athletes, the relationship between aerobic fitness, injury, and illness in youth athletes is unknown. PURPOSE: To determine whether preseason aerobic fitness predicts in-season injury and illness risk in female adolescent soccer players. STUDY DESIGN: Case-control study; Level of evidence, 3. METHODS: Fifty-four female adolescent soccer players underwent preseason evaluation to determine years of experience, body mass index (BMI), maximal aerobic capacity (VO2max), and time to exhaustion (Tmax) during cycle ergometer testing...
September 2017: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/28902114/effects-of-repeated-sprints-with-changes-of-direction-on-youth-soccer-player-s-performance-impact-of-initial-fitness-level
#5
Fábio Y Nakamura, Javier Sanchez-Sanchez, Rodrigo Ramirez-Campillo, Cristina Petisco, Oliver Gonzalo-Skok, Alejandro Rodriguez-Fernandez, Javier Miñano
The aim of this study was to assess the effect of an 8-week repeated sprint with change of direction training program on repeated sprint, intermittent endurance and change of direction performance in youth soccer players with different aerobic fitness levels. Athletes were randomly assigned into a soccer-only (n=9; age, 14.9±0.4 yr) and soccer plus repeated sprint with change of direction (RS-COD) training programs for players with high (n=10; age, 14.4±0.5 yr) and low (n=10; age, 14.4±0.5 yr) aerobic fitness...
September 6, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28895469/trends-in-aggressive-play-and-refereeing-among-the-top-five-european-soccer-leagues
#6
Ryan M Sapp, Espen E Spangenburg, James M Hagberg
Current trends suggest professional soccer is becoming less aggressive, with England often argued to have the most aggressive of the top European leagues. The purpose of this study was to investigate differences in fouls and cards as indicators of aggressive play in the first divisions of England, France, Germany, Italy, and Spain over the past decade. Number of fouls per match and per yellow card has decreased in all leagues since 2007/08, though attempted tackles per foul has not changed or has increased...
September 12, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28894427/hypernetworks-reveal-compound-variables-that-capture-cooperative-and-competitive-interactions-in-a-soccer-match
#7
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/28886966/monitoring-training-load-and-fatigue-in-soccer-players-with-physiological-markers
#8
REVIEW
Léo Djaoui, Monoem Haddad, Karim Chamari, Alexandre Dellal
The quantification and monitoring of training load (TL) has been the topic of many scientific works in the last fifteen years. TL monitoring helps coaches to individually prescribe, follow-up, analyse, adjust and programme training sessions. In particular, the aim of the present review was to provide a critical literature report regarding different physiological markers of TL monitoring, particularly in soccer, as the load is specific to individual sports. Therefore, the interests and limitations of heart rate (HR), HR variability (HRV) and biochemical variables (blood, urinary and hormonal variations) were analysed, with a special focus on daily measures (before, during and after training) and monitoring throughout a whole season...
September 5, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/28882435/validation-of-headcount-2w-for-estimation-of-two-week-heading-comparison-to-daily-reporting-in-adult-amateur-player
#9
Michael L Lipton, Chloe Ifrah, Walter F Stewart, Roman Fleysher, Martin J Sliwinski, Mimi Kim, Richard B Lipton
OBJECTIVES: To validate the HeadCount-2w questionnaire for estimation of 2-week soccer heading by comparison to daily electronic diary reporting over the same two-week period. DESIGN: Prospective observational study. METHODS: Adult amateur soccer players completed HeadCount-daily, comprising 14 daily at-home assessments of soccer play and heading via a tablet PC. Following the 14day period, players completed HeadCount-2w, a web-based two-week-recall questionnaire on soccer and heading...
August 24, 2017: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/28872422/bone-turnover-markers-and-lean-mass-in-pubescent-boys-comparison-between-elite-soccer-players-and-controls
#10
Ammar Nebigh, Mohamed Elfethi Abed, Rihab Borji, Sonia Sahli, Slaheddine Sellami, Zouhair Tabka, Haithem Rebai
The aim of this study was to examine the relationship between bone mass and bone turnover markers with lean mass in pubescent soccer players. Two groups participated in this study 65 elite young soccer players that trained from 6 to 8 hours per week and 60 controls. Bone mineral density (BMD), bone mineral content (BMC) in the whole body, lower limbs, lumbar spine, and femoral neck, biochemical markers of osteocalcin (OC), bone-specific alkaline phosphatase (BAP), C-telopeptide type I collagen (CTX) and total lean mass were assessed...
September 5, 2017: Pediatric Exercise Science
https://www.readbyqxmd.com/read/28872370/neuromuscular-responses-to-conditioned-soccer-sessions-assessed-via-gps-embedded-accelerometers-insights-into-tactical-periodization
#11
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
https://www.readbyqxmd.com/read/28872368/cryotherapy-re-invented-application-of-phase-change-material-for-recovery-in-elite-soccer
#12
Tom Clifford, Will Abbott, Susan Y Kwiecien, Glyn Howatson, Malachy P McHugh
PURPOSE: This study examined whether donning lower body garments fitted with cooled phase change material (PCM) would enhance recovery after a soccer match. METHODS: In a randomized, crossover design, eleven elite-soccer players from the reserve squad of a team in the 2nd highest league in England wore PCM cooled to 15°C (PCMcold) or left at ambient temperature (PCMamb; sham control) for 3 h after a soccer match. To assess recovery, countermovement jump (CMJ) height, maximal isometric voluntary contraction (MIVC), muscle soreness (MS), and the adapted Brief Assessment of Mood Questionnaire (BAM+) were measured before, 12, 36 and 60 h after each match...
September 5, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28871832/adding-fish-oil-to-whey-protein-leucine-and-carbohydrate-over-a-6-week-supplementation-period-attenuates-muscle-soreness-following-eccentric-exercise-in-competitive-soccer-players
#13
Jordan D Philpott, Chris Donnelly, Ian H Walshe, James Dick, Stuart D R Galloway, Kevin D Tipton, Oliver C Witard
Soccer players often experience eccentric exercise-induced muscle damage given the physical demands of soccer match-play. Since long chain n-3 polyunsaturated fatty acids (n-3PUFA) enhance muscle sensitivity to protein supplementation, dietary supplementation with a combination of fish oil-derived n-3PUFA, protein and carbohydrate may promote exercise recovery. This study examined the influence of adding n-3PUFA to a whey protein, leucine and carbohydrate containing beverage over a 6 week supplementation period on physiological markers of recovery measured over 3 days following eccentric exercise...
September 5, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/28866578/bring-it-to-the-pitch-combining-video-and-movement-data-to-enhance-team-sport-analysis
#14
Manuel Stein, Halldor Janetzko, Andreas Lamprecht, Thorsten Breitkreutz, Philipp Zimmermann, Bastian Goldlucke, Tobias Schreck, Gennady Andrienko, Michael Grossniklaus, Daniel A Keim
Analysts in professional team sport regularly perform analysis to gain strategic and tactical insights into player and team behavior. Goals of team sport analysis regularly include identification of weaknesses of opposing teams, or assessing performance and improvement potential of a coached team. Current analysis workflows are typically based on the analysis of team videos. Also, analysts can rely on techniques from Information Visualization, to depict e.g., player or ball trajectories. However, video analysis is typically a time-consuming process, where the analyst needs to memorize and annotate scenes...
August 29, 2017: IEEE Transactions on Visualization and Computer Graphics
https://www.readbyqxmd.com/read/28859011/construct-validation-of-the-fms-relationship-between-a-jump-landing-task-and-fms-items
#15
Kornelius Kraus, Elisabeth Schütz, Ralf Doyscher
Sports injuries and athletic performance are complex areas, which are characterized by manifold interdependencies. The landing error scoring system (LESS) is a valid screening tool to examine bilateral jump-landing mechanics. Whereas, the Functional Movement Screen (FMS) items are thought to operationalize flexibility and motor behaviour during low intense bodyweight patterns. The aim of the study was to explore possible interdependency of the diagnostic information of these screening tools. 53 athletes (age 23...
August 29, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28858052/resistance-training-status-and-effectiveness-of-low-frequency-resistance-training-on-upper-body-strength-and-power-in-highly-trained-soccer-players
#16
Maxime Hertzog, Michael Clemens Rumpf, Karim Hader
Soccer is classified as a contact/collision sport with many player-to-player duels. Winning these duels, shielding the ball or fending off an opponent requires upper-body strength and power. Therefore this study aimed, a) to examine the time-related effect of an upper-body RT on maximal strength and power changes in highly trained soccer players, b) to investigate if the resistance-training (RT) status influences these changes throughout a competitive season. Twenty-eight soccer players participated in this study and were divided into an untrained (UG) and a trained (TG) group, according to their RT status...
August 26, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28855883/long-term-practice-with-domain-specific-task-constraints-influences-perceptual-skills
#17
Luca Oppici, Derek Panchuk, Fabio R Serpiello, Damian Farrow
The long-term impact of practice with different task constraints on perceptual skill is relatively un-explored. This study examined the influence of extensive practice, i.e., more than a 1000 h of structured practice, with domain-specific task constraints on perceptual skill associated with the passing action. Despite performing the same passing skill, it is not known whether long-term exposure to specific soccer or futsal task constraints influences the players' attunement to environmental information. This study examined this issue by assessing the attention orientation of soccer (n = 24) and futsal players (n = 24) during modified games (6 vs...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28847026/relationship-between-anxiety-and-interleukin-10-in-female-soccer-players-with-and-without-premenstrual-syndrome-pms
#18
Roberta Foster, Mauro Vaisberg, Maíta Poli de Araújo, Marcia Aparecida Martins, Tiago Capel, Andre Luis Lacerda Bachi, Zsuzsanna Ilona Katalin de Jármy-Di Bella
Objective To investigate the level of anxiety and its relationship with interleukin (IL)-10 (anti inflammatory cytokine that modulates mood swings) in a group of female soccer players. Methods Fifty-two eumenorrheic soccer players were evaluated (age 19.8 ± 4.7 years). The presence of premenstrual syndrome (PMS) and phases of the menstrual cycle were determined by a daily symptom report (DSR) kept for 3 consecutive months. The concentration of cytokine IL-10 was determined from urine samples collected at four moments: at the follicular and luteal phases of the menstrual cycle, and before (pre) and after (post) the simulated game, and it was quantified by flow cytometry (Luminex xMAP - EMD Millipore, Billerica, MA, USA)...
August 28, 2017: Revista Brasileira de Ginecologia e Obstetrícia
https://www.readbyqxmd.com/read/28844725/sprint-mechanics-return-to-competition-follow-up-after-hamstring-injury-on-a-professional-soccer-player-a-case-study-with-an-inertial-sensor-unit-based-methodological-approach
#19
Igor Setuain, Pablo Lecumberri, Mikel Izquierdo
BACKGROUND: The present research aimed to describe an inertial unit (IU)-based sprint mechanics evaluation model for assessing players' readiness to return to competition after suffering a grade I hamstring injury. METHODS: A professional male football player (age 19years; height 177cm; weight 70kg, midfielder, Spanish, 3° Division) with a grade 1 biceps femoris injury was evaluated at pre-season, at return to play after injury and at the end of the competitive season...
August 20, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28842788/the-brazilian-world-cup-too-hot-for-soccer
#20
Rebecca Luna Lucena, Ercília Torres Steinke, Christina Pacheco, Lucas Lima Vieira, Maribel Olaya Betancour, Valdir Adilson Steinke
The main objective of this research was to analyze the climate data for the host cities of the soccer World Cup held in Brazil in June and July 2014. A great deal of criticism was expressed about the Brazilian climate in the national and international press and media in the run-up to the competition, suggesting that the air temperature and relative air humidity would be the main adversaries of the soccer teams, especially those from Europe, during the competition. An analysis of the weather was done at the places and times of each of the 64 matches held...
August 25, 2017: International Journal of Biometeorology
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