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https://www.readbyqxmd.com/read/28819742/authors-reply-to-mcmahon-et-al-comment-on-anthropometric-and-physical-qualities-of-elite-male-youth-rugby-league-players
#1
Kevin Till, Sean Scantlebury, Ben Jones
No abstract text is available yet for this article.
August 17, 2017: Sports Medicine
https://www.readbyqxmd.com/read/28816618/ground-reaction-forces-produced-by-two-different-hockey-skating-arm-swing-techniques
#2
Julie Hayward-Ellis, Marion J L Alexander, Cheryl M Glazebrook, Jeff Leiter
The arm swing in hockey skating can have a positive effect on the forces produced by each skate, and the resulting velocity from each push off. The main purpose of this study was to measure the differences in ground reaction forces (GRFs) produced from an anteroposterior versus a mediolateral style hockey skating arm swing. Twenty-four elite-level female hockey players performed each technique while standing on a ground-mounted force platform, and all trials were filmed using two video cameras. Force data was assessed for peak scaled GRFs in the frontal and sagittal planes, and resultant GRF magnitude and direction...
August 17, 2017: European Journal of Sport Science
https://www.readbyqxmd.com/read/28816171/effect-of-magnesium-supplementation-on-muscular-damage-markers-in-basketball-players-during-a-full-season
#3
Alfredo Córdova Martínez, Diego Fernández-Lázaro, Juan Mielgo-Ayuso, Jesús Seco Calvo, Alberto Caballero García
Although it has been widely accepted that Mg has a positive effect on muscle function, studies on the efficacy of Mg supplementation in young athletes have generated contrasting results. The aim of this work was to examine the effect of Mg supplementation on muscular damage markers and the association between serum Mg levels with these muscular markers. Twelve elite male basketball players (PB) from a team of Spanish Professional Basketball League and a control group (CG) comprising twelve university students who practiced regularly recreational basketball and competed in minor university leagues participated in this study...
August 17, 2017: Magnesium Research: Official Organ of the International Society for the Development of Research on Magnesium
https://www.readbyqxmd.com/read/28812449/balancing-performance-based-expectations-with-a-holistic-perspective-on-coaching-a-qualitative-study-of-swedish-women-s-national-football-team-coaches-practice-experiences
#4
Eva-Carin Lindgren, Natalie Barker-Ruchti
PURPOSE: The purpose of this study was to explore how an exclusive sample of women's national football team coaches described how they implement careful coaching while facing social and organizational pressure to win medals. METHOD: To consider coaches' negotiations, we drew on Noddings' concept of caring. Using an interpretive research paradigm, we conducted in-depth interviews with five Swedish women's national football team coaches. An abductive approach was used to simultaneously process the theoretical framework of "ethics of care" and the empirical data...
December 2017: International Journal of Qualitative Studies on Health and Well-being
https://www.readbyqxmd.com/read/28811191/can-psychological-well-being-scales-and-hormone-levels-be-used-to-predict-acute-performance-of-anaerobic-training-tasks-in-elite-female-volleyball-players
#5
Juan Mielgo-Ayuso, Michael C Zourdos, Vicente J Clemente-Suárez, Julio Calleja-González, Amber M Shipherd
The purpose of this study was to examine relationships between pre-training psychological well-being assessment scales (General Health Questionnaire-28-GHQ-28, Competitive State Anxiety Inventory-2-CSAI-2, Sport Competition Anxiety Test-SCAT, State-Trait Anxiety Inventory-S-STAI-S, Oviedo Sleep Questionnaire-OSQ and Psychological Characteristics Related to Sport Performance-PCSP), and pre-training stress hormone concentrations (cortisol-C, total testosterone-TT, free testosterone-FT, adrenocorticotropic hormone-ACTH and testosterone/cortisol-T/C ratios), on acute neuromuscular performance (ANP) in female volleyballers...
August 12, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/28806751/the-relative-age-effect-reversal-among-the-national-hockey-league-elite
#6
Luca Fumarco, Benjamin G Gibbs, Jonathan A Jarvis, Giambattista Rossi
Like many sports in adolescence, junior hockey is organized by age groups. Typically, players born after December 31st are placed in the subsequent age cohort and as a result, will have an age advantage over those players born closer to the end of the year. While this relative age effect (RAE) has been well-established in junior hockey and other professional sports, the long-term impact of this phenomenon is not well understood. Using roster data on North American National Hockey League (NHL) players from the 2008-2009 season to the 2015-2016 season, we document a RAE reversal-players born in the last quarter of the year (October-December) score more and command higher salaries than those born in the first quarter of the year...
2017: PloS One
https://www.readbyqxmd.com/read/28806100/including-the-copenhagen-adduction-exercise-in-the-fifa-11-provides-missing-eccentric-hip-adduction-strength-effect-in-male-soccer-players-a-randomized-controlled-trial
#7
Joar Harøy, Kristian Thorborg, Andreas Serner, André Bjørkheim, Linn E Rolstad, Per Hölmich, Roald Bahr, Thor Einar Andersen
BACKGROUND: The FIFA 11+ was developed as a complete warm-up program to prevent injuries in soccer players. Although reduced hip adduction strength is associated with groin injuries, none of the exercises included in the FIFA 11+ seem to specifically target hip adduction strength. PURPOSE: To investigate the effect on eccentric hip adduction strength of the FIFA 11+ warm-up program with or without the Copenhagen adduction exercise. STUDY DESIGN: Randomized controlled trial; Level of evidence, 1...
August 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28800006/match-demands-of-senior-and-junior-players-during-international-rugby-league
#8
Gary M Dempsey, Neil V Gibson, Dave Sykes, Brad Pryjmachuk, Anthony P Turner
This study aims to quantify and compare the positional game demands of international junior and senior rugby league competition for the first time. Global Positioning System (GPS) and video analysis were used to track 118 elite male rugby league players (57 seniors aged 28.7 ± 4.4 y; 61 juniors aged 17.2 ± .5 y) over 10 international matches (6 senior; 4 junior) characterized as either forwards (n = 67) or backs (n = 51). There were significant increases in the offensive carries (0.18 cf. 0.09 n.min; r = ...
August 9, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28790976/factors-affecting-measurement-of-salivary-cortisol-and-secretory-immunoglobulin-a-in-field-studies-of-athletes
#9
Barry Thomas Pritchard, Warren Stanton, Roger Lord, Peter Petocz, Gert-Jan Pepping
AIMS: Biological and lifestyle factors, such as daily rhythm, caffeine ingestion, recent infection, and antibiotic intake, have been shown to influence measurements of salivary cortisol (SC) and secretory immunoglobulin A (sIgA). Current methodology in unsynchronized, field-based biomarker studies does not take these effects into account. Moreover, very little is known about the combined effects of biological and lifestyle factors on SC and sIgA. This study supports development of a protocol for measuring biomarkers from saliva collected in field studies by examining the individual and combined effects of these factors on SC and sIgA...
2017: Frontiers in Endocrinology
https://www.readbyqxmd.com/read/28789628/patellar-tendinopathy-in-young-elite-soccer-clinical-and-sonographical-analysis-of-a-german-elite-soccer-academy
#10
Gerrit Bode, Thorsten Hammer, N Karvouniaris, M J Feucht, L Konstantinidis, N P Südkamp, A Hirschmüller
BACKGROUND: The prevalence of patellar tendinopathy is elevated in elite soccer compared to less explosive sports. While the burden of training hours and load is comparably high in youth elite players (age < 23 years), little is known about the prevalence of patellar tendinopathy at this age. There is only little data available on the influence of age, the amount of training, the position on the field, as well as muscular strength, range of motion, or sonographical findings in this age group...
August 8, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/28777248/inter-and-intra-rater-reliability-of-the-athletic-ability-assessment-in-sub-elite-australian-rules-football-players
#11
Daniel K Rogers, Ian McKeown, Gaynor Parfitt, Darren Burgess, Roger G Eston
The aim of this study was to determine the inter- and intra-rater rater reliability of the Athletic Ability Assessment (AAA) in sub-elite Australian Rules football (ARF) players. Eighteen male ARF players completed the AAA movement assessment (overhead squat, double lunge [left and right], single leg Romanian deadlift [left and right], chin-up and push-up), on two occasions separated by one week. During the first movement assessment players were filmed in the frontal and sagittal planes. Ten raters took part in the study (one experienced rater and nine novices) and were assigned in a quasi-random manner, to complete either (a) real-time assessment on two occasions, (b) real-time assessment on one occasion or (c) video-based assessment on two occasions...
July 31, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28771066/estimates-of-energy-intake-and-expenditure-in-elite-female-touch-players-during-an-international-tournament
#12
Nicola Marsh, Nick Dobbin, Craig Twist, Chris Curtis
This study assessed energy intake and expenditure of international female Touch players during an international tournament. Energy intake (food diary) and expenditure (accelerometer, global positioning system) were recorded for 16 female Touch players during a four-day tournament, competing in 8.0 ± 1.0 matches; two on days one, two and four, and three on day three. Total daily energy expenditure (43.6 ± 3.1 Kcal·kg(-1) body mass (BM)) was not different (P > 0.05) from energy intake (39.9 ± 9.4 Kcal·kg(-1) BM)...
August 3, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/28770661/the-effects-of-football-match-congestion-in-an-international-tournament-on-hip-adductor-squeeze-strength-and-pain-in-elite-youth-players
#13
Martin Wollin, Tania Pizzari, Kane Spagnolo, Marijke Welvaert, Kristian Thorborg
The purpose of this study was to investigate the effect of a congested international tournament match schedule on adductor strength and pain in elite youth football players. Twenty-two male players (age: 15.53 ± 0.48 years, height: 174.87 ± 7.59 cm, weight: 67.45 ± 7.40 kg) were included. The 5-second adductor squeeze strength was captured daily using a hand-held dynamometer during a 7-game international tournament. Pain during the squeeze test was recorded using numerical pain ratings (0-10) to quantify groin pain...
August 3, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28768338/combined-effects-of-fatigue-and-surface-instability-on-jump-biomechanics-in-elite-athletes
#14
Olaf Prieske, Marie Demps, Melanie Lesinski, Urs Granacher
The present study aimed to examine the effects of fatigue and surface instability on kinetic and kinematic jump performance measures. Ten female and 10 male elite volleyball players (18±2 years) performed repetitive vertical double-leg box jumps until failure. Pre and post fatigue, jump height/performance index, ground reaction force and knee flexion/valgus angles were assessed during drop and countermovement jumps on stable and unstable surfaces. Fatigue, surface condition, and sex resulted in significantly lower drop jump performance and ground reaction force (p≤0...
August 2, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28761702/static-stretching-does-not-enhance-recovery-in-elite-youth-soccer-players
#15
Sam Pooley, Owen Spendiff, Matt Allen, Hannah J Moir
BACKGROUND: Static stretching (SS) is a recovery intervention used for the reduction of muscle soreness postexercise. The effects of SS on elite young footballers have received little attention, and therefore the aim of this study was to assess the effects of SS on muscle recovery following competitive soccer matches in elite young footballers. METHODS: Ten male participants (16±1 years) were recruited from an English Premier League professional soccer academy...
2017: BMJ Open Sport & Exercise Medicine
https://www.readbyqxmd.com/read/28759901/subsequent-injuries-and-early-recurrent-diagnoses-in-elite-rugby-union-players
#16
Sean Williams, Grant Trewartha, Simon Kemp, Matthew J Cross, John H M Brooks, Colin W Fuller, Aileen E Taylor, Keith A Stokes
An eight-season (2005/06-2012/13) prospective cohort design was used to record time-loss injuries in 15 English Premiership teams. Data pertaining to a total of 1 556 players and 9 597 injuries (8 180 subsequent) were included in the analysis. Injuries subsequent to an index injury were classified as (1) New: different site; (2) Local: same site (and different type); or (3) Recurrent: same site and type. The severity of subsequent injuries (days missed) was compared with their related index injury. The proportions of early (<2 months), late (2-12 months) and delayed (>12 months) subsequent injuries were compared across injury classifications and diagnosis groupings...
July 31, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28759890/maturity-status-influences-the-relative-age-effect-in-national-top-level-youth-alpine-ski-racing-and-soccer
#17
Lisa Müller, Christoph Gonaus, Christoph Perner, Erich Müller, Christian Raschner
Since the relative age effect (RAE) characterizes a problem in all age categories of alpine ski racing and soccer and the fact that, yet, to date the underlying factors have not been well investigated, the aim of the present study was to assess the influence of the biological maturity status on the RAE among youth alpine ski racers (YSR) and soccer players (SP). In total, 183 male and female YSR selected for national final races and 423 male SP selected for Elite Youth Development Centres were investigated...
2017: PloS One
https://www.readbyqxmd.com/read/28759603/the-isokinetic-strength-profile-of-elite-soccer-players-according-to-playing-position
#18
Robert Śliwowski, Monika Grygorowicz, Radosław Hojszyk, Łukasz Jadczak
The aim of this study was to compare isokinetic strength performance profiles in elite soccer players across different field positions. A total of 111 elite international players of Polish Ekstraklasa (the top division in Poland) were examined during the 2010-2015 seasons. The players were classified into six positional roles: central defenders (CD), external defenders (ED), central midfielders (CM), external midfielders (EM), forwards (F), and goalkeepers (G). The concentric isokinetic strength (peak torque [PT] of quadriceps and hamstrings, H/Q ratios) was calculated for the dominant leg and the non-dominant leg at angular velocity of 1...
2017: PloS One
https://www.readbyqxmd.com/read/28759539/reliability-characteristics-and-applicability-of-a-repeated-sprint-ability-test-in-male-young-soccer-players
#19
Carlo Castagna, Lorenzo Francini, Peter Krustrup, Juliano Fenarnandes-da-Silva, Susana C A Póvoas, Andrea Bernardini, Stefano D'Ottavio
The aim of this study was to examine the usefulness and reliability characteristics of a repeated sprint ability test considering 5 line sprints of 30-m interspersed with 30-s of active recovery in non-elite outfield young male soccer players. Twenty-six (age 14.9±1.2 years, height 1.72±0.12 cm, body mass 62.2±5.1 kg) players were tested 48 hours and 7 days apart for 5x30-m performance over 5 trials (T1-T5). Short- (T1-T2) and long-term reliability (T1-T3-T4-T5) were assessed with Intraclass Correlation Coefficient (ICC) and with typical error for measurement (TEM)...
July 28, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28759316/conservative-management-for-stable-high-ankle-injuries-in-professional-football-players
#20
Derrick M Knapik, Anthony Trem, Joseph Sheehan, Michael J Salata, James E Voos
CONTEXT: High ankle "syndesmosis" injuries are common in American football players relative to the general population. At the professional level, syndesmotic sprains represent a challenging and unique injury lacking a standardized rehabilitation protocol during conservative management. EVIDENCE ACQUISITION: PubMed, Biosis Preview, SPORTDiscus, PEDro, and EMBASE databases were searched using the terms syndesmotic injuries, American football, conservative management, and rehabilitation...
July 1, 2017: Sports Health
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