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https://www.readbyqxmd.com/read/28214098/is-perceived-athlete-leadership-quality-related-to-team-effectiveness-a-comparison-of-three-professional-sports-teams
#1
Katrien Fransen, S Alexander Haslam, Clifford J Mallett, Niklas K Steffens, Kim Peters, Filip Boen
OBJECTIVES: Researchers have argued that leadership is one of the most important determinants of team effectiveness. The present study examined the extent to which the perceived quality of athlete leadership was related to the effectiveness of elite sports teams. DESIGN: Three professional football teams (N=135) participated in our study during the preparation phase for the Australian 2016 season. METHODS: Players and coaching staff were asked to assess players' leadership quality in four leadership roles (as task, motivational, social, and external leader) via an online survey...
January 24, 2017: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/28210349/a-comparison-of-serve-speed-and-motor-coordination-between-elite-and-club-level-tennis-players
#2
Mustafa Söğüt
The purpose of this study was to compare the serve speed and motor coordination of elite and club level junior tennis players aged 11-14 years. Participants (n=35) were assigned to one of the two groups according to their experience, weekly training volume and competition level. Serve speed was assessed with a sports radar gun. Motor coordination was evaluated by means of the Körperkoordinationstest für Kinder. The main results revealed that serve speed and motor coordination performance levels of the elite group were significantly higher than those of the club group...
January 1, 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28210347/assessing-cognitive-performance-in-badminton-players-a-reproducibility-and-validity-study
#3
Tanja van de Water, Barbara Huijgen, Irene Faber, Marije Elferink-Gemser
Fast reaction and good inhibitory control are associated with elite sports performance. To evaluate the reproducibility and validity of a newly developed Badminton Reaction Inhibition Test (BRIT), fifteen elite (25 ± 4 years) and nine non-elite (24 ± 4 years) Dutch male badminton players participated in the study. The BRIT measured four components: domain-general reaction time, badminton-specific reaction time, domain-general inhibitory control and badminton-specific inhibitory control. Five participants were retested within three weeks on the badminton-specific components...
January 1, 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28210346/mental-toughness-in-talented-youth-tennis-players-a-comparison-between-on-court-observations-and-a-self-reported-measure
#4
Ruben Houwer, Tamara Kramer, Ruud den Hartigh, Nikki Kolman, Marije Elferink-Gemser, Barbara Huijgen
In tennis, mental toughness is often considered highly important in achieving the elite level. The current study is the first to examine behavioural expressions of mental toughness on the court and their relationships with self-reported measures. Based on the input of five experienced tennis coaches of junior tennis players and behaviours used in previous studies, we developed a taxonomy consisting of six positive behaviours and ten negative ones. To investigate the relationship between these on-court behaviours of mental toughness and how the players rated their own mental toughness, emotional control in particular, six talented tennis players (aged 10-13) were recorded during tennis matches and filled out the self-reported measure of mental toughness (MTQ48)...
January 1, 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28210345/the-dutch-technical-tactical-tennis-test-d4t-for-talent-identification-and-development-psychometric-characteristics
#5
Nikki Kolman, Barbara Huijgen, Tamara Kramer, Marije Elferink-Gemser, Chris Visscher
This study examined the test-retest reliability, validity and feasibility of the newly developed Dutch Technical-Tactical Tennis Test (D4T). This new test is relevant for talent identification and development in tennis. Thirty-two youth male tennis players (age 13.4 ± 0.5) were classified as elite (n = 15) or sub-elite (n = 17) according to their position on the national youth ranking list under 15 years (cut-off rank 50) in the Netherlands. Games, rallies and different tactical situations (i.e. offensive, neutral and defensive) were simulated with a ball machine...
January 1, 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28210337/extraction-of-knowledge-from-the-topographic-attentive-mapping-network-and-its-application-in-skill-analysis-of-table-tennis
#6
Isao Hayashi, Masanori Fujii, Toshiyuki Maeda, Jasmin Leveille, Tokio Tasaka
The Topographic Attentive Mapping (TAM) network is a biologically-inspired classifier that bears similarities to the human visual system. In case of wrong classification during training, an attentional top-down signal modulates synaptic weights in intermediate layers to reduce the difference between the desired output and the classifier's output. When used in a TAM network, the proposed pruning algorithm improves classification accuracy and allows extracting knowledge as represented by the network structure...
January 1, 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28207979/a-comparison-of-injuries-in-elite-male-and-female-football-players-a-5-season-prospective-study
#7
Jon Larruskain, Jose A Lekue, Nerea Diaz, Adrian Odriozola, Susana M Gil
The aim was to compare the epidemiology of injuries between elite male and female football players from the same club. Injuries and individual exposure time in a male team and a female team, both playing in the Spanish first division, were prospectively recorded by the club's medical staff for five seasons (2010-2015) following the FIFA consensus statement. Total, training and match exposure hours per player-season were 20% higher for men compared to women (P < 0.01). Total, training and match injury incidence were 30-40% higher in men (P ≤ 0...
February 16, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28205470/arthrodesis-of-little-finger-distal-interphalangeal-joint-in-flexion-to-regain-sporting-ability
#8
S M Beecher, D E O'Briain, J P Ng, E Murphy, M E O'Sullivan
BACKGROUND: Finger injuries are common in the sport of hurling. Injury to the little finger distal interphalangeal joint (DIPJ) often occurs when a high dropping ball impacts on the outstretched finger. The little finger contributes to approximately 15% of grip strength. Injury therefore results in reduced grip strength and may impair the ability of players to grip or catch a ball. METHODS: Six elite hurlers with post-traumatic arthritis of their non-dominant little finger DIPJ underwent arthrodesis in 30 degrees of flexion...
March 2017: Journal of Hand Surgery Asian-Pacific Volume
https://www.readbyqxmd.com/read/28197695/rotational-glenohumeral-adaptations-are-associated-with-shoulder-pathology-in-professional-male-handball-players
#9
Przemyslaw Lubiatowski, Piotr Kaczmarek, Pawel Cisowski, Ewa Breborowicz, Monika Grygorowicz, Marcin Dzianach, Tomasz Krupecki, Lior Laver, Leszek Romanowski
PURPOSE: Glenohumeral range of motion adaptations may affect throwing athletes and contribute to shoulder injury. The purpose of this study was to evaluate shoulder rotation deficits among elite professional handball players and its correlation to the presence of shoulder pain and morphological changes. METHODS: Eighty-seven elite professional handball players and 41 healthy non-athlete volunteers participated in the study. Evaluations included measurement of range of internal and external rotation, total arch of motion, identification of shoulder pain and ultrasound scan for diagnosis of rotator cuff tears and internal impingement...
February 15, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28197354/neuromuscular-coordination-deficit-persists-12-months-after-acl-reconstruction-but-can-be-modulated-by-6-weeks-of-kettlebell-training-a-case-study-in-women-s-elite-soccer
#10
Mette K Zebis, Christoffer H Andersen, Jesper Bencke, Christina Ørntoft, Connie Linnebjerg, Per Hölmich, Kristian Thorborg, Per Aagaard, Lars L Andersen
The aim of the present single-case study was to investigate the effect of 6 weeks' kettlebell training on the neuromuscular risk profile for ACL injury in a high-risk athlete returning to sport after ACL reconstruction. A female elite soccer player (age 21 years) with no previous history of ACL injury went through neuromuscular screening as measured by EMG preactivity of vastus lateralis and semitendinosus during a standardized sidecutting maneuver. Subsequently, the player experienced a noncontact ACL injury...
2017: Case Reports in Orthopedics
https://www.readbyqxmd.com/read/28192830/thermoregulatory-responses-during-competitive-wheelchair-rugby-match-play
#11
Katy E Griggs, George Havenith, Michael J Price, Barry S Mason, Victoria L Goosey-Tolfrey
The purpose of this study was to determine whether a player's physical impairment or activity profile was related to the amount of thermal strain experienced during wheelchair rugby match play. 17 elite wheelchair rugby players played a competitive match, whilst activity profiles, measures of core and skin temperature, heart rate and perceptual responses were taken. Players were divided into 2 groups depending on their physical impairment: players with a cervical spinal cord injury, (n=10) or non-spinal related physical impairment (n=7)...
February 13, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28192512/explosive-strength-and-endurance-adaptations-in-young-elite-soccer-players-during-two-soccer-seasons
#12
Riccardo Di Giminiani, Christiano Visca
The purpose of the present study was to investigate the explosive strength and endurance adaptations in young elite soccer players who underwent a supervised training program for a period of two years. Nineteen players, with seven years of training experience (age: 13.3 ± 0.1 years; body weight: 57.9 ± 4.9 kg; height: 168.9 ± 4.7 cm; BMI: 20.1 ± 1.1 kg/m2), voluntarily participated in the present study. The testing sessions were performed at the beginning of the preparation period in the first (T1), second (T2), and third year (T3)...
2017: PloS One
https://www.readbyqxmd.com/read/28190980/effect-of-low-dose-short-term-creatine-supplementation-on-muscle-power-output-in-elite-youth-soccer-players
#13
Aquiles Yáñez-Silva, Cosme F Buzzachera, Ivan Da C Piçarro, Renata S B Januario, Luis H B Ferreira, Steven R McAnulty, Alan C Utter, Tacito P Souza-Junior
BACKGROUND: To determine the effects of a low dose, short-term Creatine monohydrate (Cr) supplementation (0.03 g.kg.d(-1) during 14 d) on muscle power output in elite youth soccer players. METHODS: Using a two-group matched, double blind, placebo-controlled design, nineteen male soccer players (mean age = 17.0 ± 0.5 years) were randomly assigned to either Cr (N = 9) or placebo (N = 10) group. Before and after supplementation, participants performed a 30s Wingate Anaerobic Test (WAnT) to assess peak power output (PPO), mean power output (MPO), fatigue index (FI), and total work...
2017: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/28182523/monitoring-hitting-load-in-tennis-using-inertial-sensors-and-machine-learning
#14
David Whiteside, Olivia Cant, Molly Connolly, Machar Reid
PURPOSE: Quantifying external workload is fundamental to training prescription in sport. In tennis, global positioning data are imprecise and fail to capture hitting loads. The current gold standard (manual notation) is time intensive and often not possible given players' heavy travel schedules. The aim of this study was to develop an automated stroke classification system to help quantify hitting load in tennis. METHODS: 18 athletes wore an inertial measurement unit (IMU) on their wrist during 66 video-recorded training sessions...
February 9, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28182504/the-player-load-associated-with-typical-activities-in-elite-netball
#15
Jared A Bailey, Paul B Gastin, Luke Mackey, Dan B Dwyer
PURPOSE: Previous investigations of player load in netball have utilised subjective methodologies, with few utilising objective methodologies. Whilst all studies report differences in player activities or total load between playing positions, it is unclear how the differences in player activity explain differences in positional load. The aim of this study was to objectively quantify the load associated with typical activities for all positions in elite netball. METHODS: The player load of all playing positions in an elite netball team, was measured during matches using wearable accelerometers...
February 9, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28178738/core-executive-functions-are-associated-with-success-in-young-elite-soccer-players
#16
Torbjörn Vestberg, Gustaf Reinebo, Liselotte Maurex, Martin Ingvar, Predrag Petrovic
Physical capacity and coordination cannot alone predict success in team sports such as soccer. Instead, more focus has been directed towards the importance of cognitive abilities, and it has been suggested that executive functions (EF) are fundamentally important for success in soccer. However, executive functions are going through a steep development from adolescence to adulthood. Moreover, more complex EF involving manipulation of information (higher level EF) develop later than simple executive functions such as those linked to simple working memory capacity (Core EF)...
2017: PloS One
https://www.readbyqxmd.com/read/28177720/free-sugar-total-sugar-fibre-and-micronutrient-intake-within-elite-youth-british-soccer-players-a-nutritional-transition-from-schoolboy-to-fulltime-soccer-player
#17
Robert J Naughton, Barry Drust, Andy O'Boyle, Julie Abayomi, Elizabeth Mahon, James P Morton, Ian G Davies
It is recommended that soccer players consume a high carbohydrate (CHO) diet to augment performance. However, growing evidence suggests that there is a link between high free-sugar (FS) intake (>5% total energy intake; TEI) and metabolic diseases. Furthermore, foods that are often high in sugar, such as processed foods, are typically lacking in nutrient quality. We therefore analysed total- and FS, dietary fibre and micronutrient intake of players from an English Premier League academy under(U) 18 (n=13); U15/16 (n=25); U13/14 (n=21) using a 7-day food diary...
January 10, 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/28173971/the-acceleration-and-deceleration-profiles-of-elite-female-soccer-players-during-competitive-matches
#18
Jocelyn K Mara, Kevin G Thompson, Kate L Pumpa, Stuart Morgan
OBJECTIVES: The aim of this study was to determine the acceleration (≥2ms(-2)) and deceleration (≤-2ms(-2)) profiles of elite female soccer players during competitive matches. DESIGN: Single cohort, observational study. METHODS: An Optical Player Tracking system was used to determine acceleration (≥2ms(-2)) and deceleration (≤-2ms(-2)) variables for twelve elite female players across seven competitive matches. RESULTS: In total, players performed 423 (±126) accelerations and 430 (±125) decelerations per match...
January 24, 2017: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/28169152/sleep-patterns-and-match-performance-in-elite-australian-basketball-athletes
#19
Craig Staunton, Brett Gordon, Edhem Custovic, Jonathan Stanger, Michael Kingsley
OBJECTIVES: To assess sleep patterns and associations between sleep and match performance in elite Australian female basketball players. DESIGN: Prospective cohort study. METHODS: Seventeen elite female basketball players were monitored across two consecutive in-season competitions (30 weeks). Total sleep time and sleep efficiency were determined using triaxial accelerometers for Baseline, Pre-match, Match-day and Post-match timings. Match performance was determined using the basketball efficiency statistic (EFF)...
January 24, 2017: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/28166184/postactivation-potentiation-and-change-of-direction-speed-in-elite-academy-rugby-players
#20
Chris Bishop, Anthony N Turner, Jon Cree, Sean Maloney, James Marshall, Paul Jarvis
This study investigated the effect of preceding pro-agility sprints with maximal isometric squats to determine if postactivation potentiation (PAP) could be harnessed in change of direction speed. Sixteen elite under-17 rugby union players (age: 16 ± 0.41yrs; body mass: 88.7 ± 12.1kg, height: 1.83 ± 0.07m) from an Aviva Premiership rugby club were tested. Subjects performed a change of direction specific warm-up, followed by two baseline pro-agility tests. After 10 minutes recovery, 3 x 3-second maximal isometric squats with a 2 minute recovery between sets were completed as a conditioning activity (CA) on a force plate where peak force and mean rate of force development over 300 milliseconds were measured...
February 1, 2017: Journal of Strength and Conditioning Research
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