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https://www.readbyqxmd.com/read/28632057/rotation-sequence-to-report-humerothoracic-kinematics-during-3d-motion-involving-large-horizontal-component-application-to-the-tennis-forehand-drive
#1
Thomas Creveaux, Violaine Sevrez, Raphaël Dumas, Laurence Chèze, Isabelle Rogowski
The aim of this study was to examine the respective aptitudes of three rotation sequences (YtXf'Yh'', ZtXf'Yh'', and XtZf'Yh'') to effectively describe the orientation of the humerus relative to the thorax during a movement involving a large horizontal abduction/adduction component: the tennis forehand drive. An optoelectronic system was used to record the movements of eight elite male players, each performing ten forehand drives. The occurrences of gimbal lock, phase angle discontinuity and incoherency in the time course of the three angles defining humerothoracic rotation were examined for each rotation sequence...
February 28, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/28630584/time-loss-injuries-in-sub-elite-and-emerging-rugby-league-players
#2
Mark Booth, Rhonda Orr
This study aimed to 1) investigate the incidence and characteristics of injuries in emerging rugby league players; and 2) explore the differences in injury incidence and characteristics between the various sub-elite competitions. An NRL emerging player development squad (n = 34) was observed from the beginning of pre-season until the finish of competition. Time-loss injury was defined as any physical pain or impairment sustained that resulted in players missing a match. Injuries were categorised according to circumstance, incidence, characteristics, playing position and competition level...
June 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/28630582/doubly-disadvantaged-the-relative-age-effect-in-poland-s-basketball-players
#3
Krystian Rubajczyk, Kamil Świerzko, Andrzej Rokita
The aim of this study was to identify the relative age effect (RAE) in young Polish male (n = 3849) and female (n = 3419) basketball players aged 14 to 22 years competing in the elite games of the Polish Youth Championships. The distribution of birth dates, body height, players' match statistics, and the results of teams participating in championships were identified. The RAE was observed in male and female group, regardless of players age. Nevertheless, the greatest disproportion in the distribution of dates of birth was found in U16 group of boys (V = 0...
June 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/28630578/are-change-of-direction-speed-and-reactive-agility-useful-for-determining-the-optimal-field-position-for-young-soccer-players
#4
Giovanni Fiorilli, Enzo Iuliano, Michalis Mitrotasios, Eugenio M Pistone, Giovanna Aquino, Giuseppe Calcagno, Alessandra di Cagno
Change Of Direction Speed (CODS) and Reactive Agility (RA) are two determining factors in the ability of young soccer players. We aimed to verify if CODS and RA could be useful in order to establish the best young soccer player field position. Ninety-two elite soccer players (15.18 ± 1.21 years, weight 59.18 ± 9.93, height 1.72 ± 0.08, BMI 19.76 ± 2.22), belonging to two youth categories from the Italian First and Second Divisions, volunteered in this study. The participants included 32 defenders (15.06 ± 0...
June 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/28628348/relation-between-peak-knee-flexion-angle-and-knee-ankle-kinetics-in-single-leg-jump-landing-from-running-a-pilot-study-on-male-handball-players-to-prevent-acl-injury
#5
Mariam A Ameer, Qassim I Muaidi
OBJECTIVES: The relationship between knee kinematics and knee-ankle kinetics during the landing phase of single leg jumping has been widely studied to identify proper strategies for preventing non-contact ACL injury. However, there is a lack of study on knee-ankle kinetics at peak knee flexion angle during jumping from running. Hence, the purpose of this study is to establish the relationship between peak knee flexion angle, knee extension moment, ankle plantar flexion moment and ground reaction force in handball players in order to protect ACL from excessive stress during single leg jumping...
June 19, 2017: Physician and Sportsmedicine
https://www.readbyqxmd.com/read/28627293/new-evidence-of-relative-age-effects-in-super-elite-sportsmen-a-case-for-the-survival-and-evolution-of-the-fittest
#6
Benjamin D Jones, Gavin P Lawrence, Lew Hardy
The relative age effect (RAE) describes an overrepresentation of players born early (Q1) in a selection year and is highly prevalent within youth sport pathways. However, a dearth of research has investigated the RAE at the "super-elite" level. The present research assessed the presence of RAE in super-elite performers. Study 1 investigated RAEs in the world's best international Test cricketers (N = 262) over a 20-year period according to a robust and stringent "super-elite" criteria. Results revealed the RAE (Q1) when all disciplines were combined...
June 19, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28627289/snap-n-send-a-valid-and-reliable-method-for-assessing-the-energy-intake-of-elite-adolescent-athletes
#7
Nessan Costello, Kevin Deighton, Joshua Dyson, Jim Mckenna, Ben Jones
To ensure that elite adolescent athletes meet their unique training, growth and maturation demands, it is imperative to have access to valid measures of energy intake. Contemporary methods demand close attention-to-detail, meaning that athletes often do not fully adhere to real-time protocols. This study represents the first investigation of a real-time dietary assessment designed using a comprehensive behaviour change framework (COM-B). In a crossover design, 12 elite adolescent male rugby players recorded their energy intake via an estimated food diary (est-FD) and photography-based mobile assessment ('Snap-n-Send'), combined with a 24-h dietary recall interview...
June 17, 2017: European Journal of Sport Science
https://www.readbyqxmd.com/read/28614162/validity-of-heart-rate-based-indices-to-measure-training-load-and-intensity-in-elite-football-players
#8
Pedro Silva, Eduardo Dos Santos, Mikhail Grishin, José Mário Rocha
This study aimed to identify the most sensible heart rate-based indices to physical measures of training load and intensity. Twenty professional football players competing in the Russian league and in the UEFA Champions League were monitored during 15 training sessions (270 individual records) using GPS devices (10 Hz) and heart rate telemetry. Expert knowledge and a collinearity r < .5 were used initially to select the external physical markers for the final analysis. A multivariate-adjusted within-subjects model was employed to quantify the correlations between heart rate indices with various measures of training intensity and load...
June 12, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28601588/identifying-high-risk-loading-conditions-for-in-season-injury-in-elite-australian-football-players
#9
Jordan Stares, Brian Dawson, Peter Peeling, Jarryd Heasman, Brent Rogalski, Michael Drew, Marcus Colby, Gregory Dupont, Leanne Lester
OBJECTIVES: To examine different timeframes for calculating acute to chronic workload ratio (ACWR) and whether this variable is associated with intrinsic injury risk in elite Australian football players. DESIGN: Prospective cohort study. METHODS: Internal (session rating of perceived exertion: sRPE) and external (GPS distance and sprint distance) workload and injury data were collected from 70 players from one AFL club over 4 seasons. Various acute (1-2 weeks) and chronic (3-8 weeks) timeframes were used to calculate ACWRs: these and chronic load categories were then analysed to determine the injury risk in the subsequent month...
May 25, 2017: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/28599111/corrigendum
#10
(no author information available yet)
Krosshaug T, Steffen K, Kristianslund E, et al. The vertical drop jump is a poor screening test for ACL injuries in female elite soccer and handball players: a prospective cohort study of 710 athletes. Am J Sports Med. 2016;44(4):874-883. (Original DOI: 10.1177/0363546515625048 ).
June 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28595870/high-speed-running-and-sprinting-as-an-injury-risk-factor-in-soccer-can-well-developed-physical-qualities-reduce-the-risk
#11
Shane Malone, Adam Owen, Bruno Mendes, Brian Hughes, Kieran Collins, Tim J Gabbett
OBJECTIVES: This study investigated the association between high-speed running (HSR) and sprint running (SR) and injuries within elite soccer players. The impact of intermittent aerobic fitness as measured by the end speed of the 30-15 intermittent fitness test (30-15VIFT) and high chronic workloads (average 21-day) as potential mediators of injury risk were also investigated. DESIGN: Observational Cohort Study. METHODS: 37 elite soccer players from one elite squad were involved in a one-season study...
May 25, 2017: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/28595869/multivariate-modelling-of-subjective-and-objective-monitoring-data-improve-the-detection-of-non-contact-injury-risk-in-elite-australian-footballers
#12
Marcus J Colby, Brian Dawson, Peter Peeling, Jarryd Heasman, Brent Rogalski, Michael K Drew, Jordan Stares, Hassane Zouhal, Leanne Lester
OBJECTIVES: To assess the association between workload, subjective wellness, musculoskeletal screening measures and non-contact injury risk in elite Australian footballers. DESIGN: Prospective cohort study. METHODS: Across 4 seasons in 70 players from one club, cumulative weekly workloads (acute; 1 week, chronic; 2-, 3-, 4-week) and acute:chronic workload ratio's (ACWR: 1-week load/average 4-weekly load) for session-Rating of Perceived Exertion (sRPE) and GPS-derived distance and sprint distance were calculated...
May 25, 2017: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/28595867/the-match-to-match-variation-of-match-running-in-elite-female-soccer
#13
Joshua Trewin, César Meylan, Matthew C Varley, John Cronin
OBJECTIVES: The purpose of this study was to examine the match-to-match variation of match-running in elite female soccer players utilising GPS, using full-match and rolling period analyses. DESIGN: Longitudinal study. METHODS: Elite female soccer players (n=45) from the same national team were observed during 55 international fixtures across 5 years (2012-2016). Data was analysed using a custom built MS Excel spreadsheet as full-matches and using a rolling 5-min analysis period, for all players who played 90-min matches (files=172)...
May 25, 2017: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/28594505/lisfranc-injuries-in-the-elite-athlete
#14
Michael Isiah Sandlin, Cyrus E Taghavi, Timothy P Charlton, Robert B Anderson
The management of sports-related Lisfranc injuries is optimized by a detailed understanding of the relevant anatomy, mechanisms of injury, clinical diagnostic maneuvers, imaging, and treatment options for patients with this disabling injury. A lower energy ligamentous variant Lisfranc injury, which was first observed in professional football players, has recently been described. The treatment options for patients with a Lisfranc injury include nonsurgical management, open reduction and internal fixation, suture-button fixation techniques, and arthrodesis...
February 15, 2017: Instructional Course Lectures
https://www.readbyqxmd.com/read/28585467/do-players-and-staff-sleep-more-during-the-pre-or-competitive-season-of-elite-rugby-league
#15
Johnpaul Caia, Tannath J Scott, Shona L Halson, Vincent G Kelly
This study establishes the sleep behaviour of players and staff during the pre- and competitive seasons of elite rugby league. For seven days during both the pre- and competitive seasons, seven rugby league players and nine full-time staff from one professional Australian rugby league club had their sleep monitored via wrist actigraphy and self-report sleep diaries. Two-way repeated measures analysis of variance determined differences between the pre- and competitive season in players and staff, with effect sizes (ES) used to interpret the practical magnitude of differences...
June 6, 2017: European Journal of Sport Science
https://www.readbyqxmd.com/read/28578541/anthropometric-and-physical-qualities-of-elite-male-youth-rugby-league-players
#16
REVIEW
Kevin Till, Sean Scantlebury, Ben Jones
Rugby league is a collision team sport played at junior and senior levels worldwide, whereby players require highly developed anthropometric and physical qualities (i.e. speed, change-of-direction speed, aerobic capacity, muscular strength and power). Within junior levels, professional clubs and national governing bodies implement talent identification and development programmes to support the development of youth (i.e. 13-20 years) rugby league players into professional athletes. This review presents and critically appraises the anthropometric and physical qualities of elite male youth rugby league players aged between 13 and 20 years, by age category, playing standard and playing position...
June 3, 2017: Sports Medicine
https://www.readbyqxmd.com/read/28575638/elbow-injuries-in-professional-baseball-epidemiological-findings-from-the-major-league-baseball-injury-surveillance-system
#17
Michael G Ciccotti, Keisha M Pollack, Michael C Ciccotti, John D'Angelo, Christopher S Ahmad, David Altchek, James Andrews, Frank C Curriero
BACKGROUND: Elbow injuries cause significant disability for the throwing athlete. Scant data are available on the distribution and characteristics of these injuries in elite baseball players. No study exists that focuses solely on the epidemiological characteristics of elbow injuries in professional baseball players using a comprehensive injury surveillance system. HYPOTHESIS: Professional baseball players have a high occurrence of elbow injuries influenced by factors including length of time playing, time period within the annual baseball season, and specific position played...
June 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28573403/a-kinetic-model-describing-injury-burden-in-team-sports
#18
Colin W Fuller
BACKGROUND: Injuries in team sports are normally characterised by the incidence, severity, and location and type of injuries sustained: these measures, however, do not provide an insight into the variable injury-burden experienced during a season. Injury burden varies according to the team's match and training loads, the rate at which injuries are sustained and the time taken for these injuries to resolve. At the present time, this time-based variation of injury burden has not been modelled...
June 1, 2017: Sports Medicine
https://www.readbyqxmd.com/read/28572775/perceptions-of-the-coach-athlete-relationship-predict-the-attainment-of-mastery-achievement-goals-six-months-later-a-two-wave-longitudinal-study-among-f-a-premier-league-academy-soccer-players
#19
Adam R Nicholls, Keith Earle, Fiona Earle, Daniel J Madigan
All football teams that compete within the F. A. Premier League possess an academy, whose objective is to produce more and better home-grown players that are capable of playing professionally. These young players spend a large amount of time with their coach, but little is known about player's perception of the coach-athlete relationship within F. A. Premier League Academies. The objectives of this study were to examine whether perceptions of the coach-athlete relationship changed over six months and if the coach-athlete relationship predicted self-reported goal achievement among F...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28566815/training-induced-changes-in-physical-performance-can-be-achieved-without-body-mass-reduction-after-eight-week-of-strength-and-injury-prevention-oriented-programme-in-volleyball-female-players
#20
M Lehnert, M Sigmund, P Lipinska, R Vařeková, M Hroch, Z Xaverová, P Stastny, P Háp, P Zmijewski
The purpose of the study was to analyse the changes in muscle strength, power, and somatic parameters in elite volleyball players after a specific pre-season training programme aimed at improving jumping and strength performance and injury prevention. Twelve junior female volleyball players participated in an 8-week training programme. Anthropometric characteristics, isokinetic peak torque (PT) single-joint knee flexion (H) and extension (Q) at 60º/s and 180º/s, counter movement jump (CMJ), squat jump (SJ), and reactive strength index (RSI) were measured before and after intervention...
June 2017: Biology of Sport
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