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https://www.readbyqxmd.com/read/29769817/reliability-of-single-leg-balance-and-landing-tests-in-rugby-union-prospect-of-using-postural-control-to-monitor-fatigue
#1
Jordan C Troester, Jason G Jasmin, Rob Duffield
The present study examined the inter-trial (within test) and inter-test (between test) reliability of single-leg balance and single-leg landing measures performed on a force plate in professional rugby union players using commercially available software (SpartaMARS, Menlo Park, USA). Twenty-four players undertook test - re-test measures on two occasions (7 days apart) on the first training day of two respective pre-season weeks following 48h rest and similar weekly training loads. Two 20s single-leg balance trials were performed on a force plate with eyes closed...
June 2018: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29768096/lower-extremity-muscle-function-of-front-row-rugby-union-scrummaging
#2
Mostafa Yaghoubi, Sally D Lark, Wyatt H Page, Philip W Fink, Sarah P Shultz
A rugby scrum's front row must act uniformly to transfer maximal horizontal force and improve performance. This study investigated the muscle activation patterns of lower extremity muscles in front row forwards during live and machine scrums at professional and amateur levels. Electromyography was collected bilaterally on vastus lateralis, rectus femoris and gastrocnemius muscles of 75 male rugby prop players during live and machine scrums. ANOVAs compared muscle reaction time, rate of change in muscle amplitude and muscle amplitude between groups and conditions...
May 16, 2018: Sports Biomechanics
https://www.readbyqxmd.com/read/29757054/pre-season-body-composition-adaptations-in-elite-caucasian-and-polynesian-rugby-union-athletes
#3
Adam J Zemski, Shelley E Keating, Elizabeth M Broad, Damian J March, Karen Hind, Gary J Slater
During pre-season training, rugby union (RU) athletes endeavour to enhance physical performance characteristics that are aligned with on-field success. Specific physique traits are associated with performance, therefore body composition assessment is routinely undertaken in elite environments. This study aimed to quantify pre-season physique changes in elite RU athletes with unique morphology and divergent ethnicity. Twenty-two Caucasian and Polynesian professional RU athletes received dual-energy X-ray absorptiometry (DXA) assessments at the beginning and conclusion of an 11-week pre-season...
May 14, 2018: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29757050/longitudinal-changes-in-body-composition-assessed-using-dxa-and-surface-anthropometry-show-good-agreement-in-elite-rugby-union-athletes
#4
Adam J Zemski, Shelley E Keating, Elizabeth M Broad, Gary J Slater
Rugby union athletes have divergent body composition based on the demands of their on-field playing position and ethnicity. With an established association between physique traits and positional requirements, body composition assessment is routinely undertaken. Surface anthropometry and dual-energy X-ray absorptiometry (DXA) are the most common assessment techniques utilised, often undertaken synchronously. This study aims to investigate the association between DXA and surface anthropometry when assessing longitudinal changes in fat free mass (FFM) and fat mass (FM) in rugby union athletes...
May 14, 2018: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29745789/the-physical-characteristics-of-specific-phases-of-play-during-rugby-union-match-play
#5
Dale B Read, Ben Jones, Sean Williams, Padraic Phibbs, Josh Darrall-Jones, Greg Roe, Jonathon Weakley, Andrew Rock, Kevin Till
PURPOSE: This study quantified the frequencies and timings of rugby union match-play phases (i.e., attacking, defending, ball in play (BIP) and ball out of play (BOP)) and then compared the physical characteristics of attacking, defending and BOP between forwards and backs. METHODS: Data were analysed from 59 male rugby union academy players (259 observations). Each player wore a micro-technology device (Optimeye S5, Catapult) with video footage analysed for phase timings and frequencies...
May 10, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29742747/improving-the-signal-to-noise-ratio-when-monitoring-countermovement-jump-performance
#6
Rodney A Kennedy, David Drake
Kennedy, RA and Drake, D. Improving the signal-to-noise ratio when monitoring countermovement jump performance. J Strength Cond Res XX(X): 000-000, 2018-Countermovement jump (CMJ) performance has been routinely used to monitor neuromuscular status. However, the protocol used to establish the criterion score is not well documented. The purpose of this study was to examine how the protocol used would influence of the sensitivity of CMJ variables in rugby union players. Fifteen male (age: 19.7 ± 0.5 years) rugby union players performed 8 CMJs on 2 occasions, separated by 7 days...
May 8, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29683915/organized-chaos-in-late-specialization-team-sports-weekly-training-loads-of-elite-adolescent-rugby-union-players
#7
Padraic J Phibbs, Ben Jones, Gregory Roe, Dale B Read, Joshua Darrall-Jones, Jonathon Weakley, Andrew Rock, Kevin Till
Phibbs, PJ, Jones, B, Roe, G, Read, DB, Darrall-Jones, J, Weakley, J, Rock, A, and Till, K. Organized chaos in late specialization team sports: weekly training loads of elite adolescent rugby union players. J Strength Cond Res 32(5): 1316-1323, 2018-The aim of this study was to quantify the mean weekly training load (TL) of elite adolescent rugby union players participating in multiple teams and examine the differences between playing positions. Twenty elite male adolescent rugby union players (17.4 ± 0.7 years) were recruited from a regional academy and categorized by playing position: forwards (n = 10) and backs (n = 10)...
May 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29674008/applying-systems-ergonomics-methods-in-sport-a-systematic-review
#8
Adam Hulme, Jason Thompson, Katherine L Plant, Gemma J M Read, Scott Mclean, Amanda Clacy, Paul M Salmon
INTRODUCTION: As sports systems become increasingly more complex, competitive, and technology-centric, there is a greater need for systems ergonomics methods to consider the performance, health, and safety of athletes in context with the wider settings in which they operate. Therefore, the purpose of this systematic review was to identify and critically evaluate studies which have applied a systems ergonomics research approach in the context of sports performance and injury management...
April 16, 2018: Applied Ergonomics
https://www.readbyqxmd.com/read/29651857/physical-and-physiological-demands-of-elite-rugby-union-officials
#9
Matthew R Blair, Nathan Elsworthy, Nancy J Rehrer, Chris Button, Nicholas D Gill
PURPOSE: To examine the movement and physiological demands of rugby union officiating within elite competition. METHODS: Movement demands of 9 elite officials across 12 Super Rugby matches were calculated, using global positioning system devices. Total distance (m), relative distance (m·min-1 ), percentage time spent within various speed zones were calculated across a match. Heart rate responses were also recorded throughout each match. Cohen d effect sizes were reported to examine the within match variations...
April 13, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29629620/differential-training-loads-and-individual-fitness-responses-to-pre-season-in-professional-rugby-union-players
#10
Shaun J McLaren, Andrew Smith, Jonathan D Bartlett, Iain R Spears, Matthew Weston
We aimed to compare differentiated training loads (TL) between fitness responders and non-responders to an eight-week pre-season training period in a squad of thirty-five professional rugby union players. Differential TL were calculated by multiplying player's perceptions of breathlessness (sRPE-B) and leg muscle exertion (sRPE-L) with training duration for each completed session. Performance-based fitness measures included the Yo-Yo Intermittent Recovery Test Level 1 (YYIRTL1), 10-, 20-, and 30-m linear sprint times, countermovement jump height (CMJ) and predicted one-repetition maximum back squat (P1RM Squat)...
April 9, 2018: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29627029/reported-concussion-incidence-in-youth-community-rugby-union-and-parental-assessment-of-post-head-injury-cognitive-recovery-using-the-king-devick-test
#11
David Silver, Nicola Brown, Conor Gissane
AIM: To assess the frequency of reported head injuries in youth community Rugby Union and determine whether the King-Devick (K-D) test could be used by parents as a means to chart cognitive recovery following head injury. METHODS: A prospective cohort study of 489 junior players (U9-U18) conducted at a community level Rugby Union club over four seasons. All players undertook a baseline K-D test at the start of each season. Players identified with suspected concussion performed the K-D test post injury and results were compared to their most recent baseline assessment...
May 15, 2018: Journal of the Neurological Sciences
https://www.readbyqxmd.com/read/29621279/assessing-worst-case-scenarios-in-movement-demands-derived-from-global-positioning-systems-during-international-rugby-union-matches-rolling-averages-versus-fixed-length-epochs
#12
Daniel J Cunningham, David A Shearer, Neil Carter, Scott Drawer, Ben Pollard, Mark Bennett, Robin Eager, Christian J Cook, John Farrell, Mark Russell, Liam P Kilduff
The assessment of competitive movement demands in team sports has traditionally relied upon global positioning system (GPS) analyses presented as fixed-time epochs (e.g., 5-40 min). More recently, presenting game data as a rolling average has become prevalent due to concerns over a loss of sampling resolution associated with the windowing of data over fixed periods. Accordingly, this study compared rolling average (ROLL) and fixed-time (FIXED) epochs for quantifying the peak movement demands of international rugby union match-play as a function of playing position...
2018: PloS One
https://www.readbyqxmd.com/read/29608414/bigger-stronger-faster-fitter-the-differences-in-physical-qualities-of-school-and-academy-rugby-union-players
#13
Ben Jones, Dan Weaving, Jason Tee, Joshua Darrall-Jones, Jonathon Weakley, Padraic Phibbs, Dale Read, Gregory Roe, Sharief Hendricks, Kevin Till
Limited research has compared the physical qualities of adolescent rugby union (RU) players across differing playing standards. This study therefore compared the physical qualities of academy and school Under-18 RU players. One-hundred and eighty-four (professional regional academy, n = 55 school, n = 129) male RU players underwent a physical testing battery to quantify height, body mass, strength (bench press and pull-up), speed (10, 20 and 40 m), 10 m momentum (calculated; 10 m velocity * body mass) and a proxy measure of aerobic fitness (Yo-Yo Intermittent Recovery Test Level 1; IRTL1)...
April 2, 2018: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29602475/concurrent-validation-of-an-inertial-measurement-system-to-quantify-kicking-biomechanics-in-four-football-codes
#14
Stephanie Blair, Grant Duthie, Sam Robertson, William Hopkins, Kevin Ball
Wearable inertial measurement systems (IMS) allow for three-dimensional analysis of human movements in a sport-specific setting. This study examined the concurrent validity of a IMS (Xsens MVN system) for measuring lower extremity and pelvis kinematics in comparison to a Vicon motion analysis system (MAS) during kicking. Thirty footballers from Australian football (n = 10), soccer (n = 10), rugby league and rugby union (n = 10) clubs completed 20 kicks across four conditions. Concurrent validity was assessed using a linear mixed-modelling approach, which allowed the partition of between and within-subject variance from the device measurement error...
March 21, 2018: Journal of Biomechanics
https://www.readbyqxmd.com/read/29599868/strength-and-conditioning-coaches-application-of-the-session-rating-of-perceived-exertion-method-of-monitoring-within-professional-rugby-union
#15
Thomas Comyns, Aoife Hannon
Session rating of perceived exertion (session-RPE) is a method of monitoring and managing training loads. The purpose of this study was to research how and for what purpose strength and conditioning (S&C) coaches implement this monitoring method within professional rugby union. The study also aimed to assess if S&C coaches found this monitoring method to be valid and effective. An online survey containing 24 fixed response questions was used to assess how S&C coaches applied the session-RPE method...
March 2018: Journal of Human Kinetics
https://www.readbyqxmd.com/read/29595083/playing-surface-and-uk-professional-rugby-union-injury-risk
#16
Craig Ranson, Jonathan George, James Rafferty, John Miles, Isabel Moore
Artificial rugby union playing surface installation is increasing. This prospective cohort study aimed to examine the effect of playing surface on match injury types within 157 players of two UK professional rugby union clubs playing 209 matches (96 on artificial surfaces and 113 on grass) over three seasons. There was no difference in overall injury risk between the two playing surfaces with injury incidence on artificial 80.2 (CI 69.9-91.7) and on grass 81.9 per 1000 match-hours (CI 72.2-92.5), with an incidence rate ratio (RR) of 0...
March 29, 2018: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29584514/the-same-story-or-a-unique-novel-within-participant-principle-component-analysis-of-training-load-measures-in-professional-rugby-union-skills-training
#17
Dan Weaving, Nicholas E Dalton, Christopher Black, Joshua Darrall-Jones, Padraic J Phibbs, Michael Gray, Ben Jones, Gregory A B Roe
PURPOSE: The study aimed to identify which combination of external and internal training load (TL) metrics capture similar or unique information for individual professional players during skills training in rugby union using principal component analysis (PCA). METHOD: TL data were collected from twenty-one male professional rugby union players across a competitive season. This included PlayerLoad™, total distance (TD), and individualised high-speed distance (HSD; >61% maximal velocity; all external TL) obtained from a micro-technology device worn by each player (Optimeye X4, Catapult Innovations, Melbourne, Australia) and the session-rating of perceived exertion (sRPE; internal TL)...
March 27, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29581994/does-the-reliability-of-reporting-in-injury-surveillance-studies-depend-on-injury-definition
#18
Matthew Cross, Sean Williams, Simon P T Kemp, Colin Fuller, Aileen Taylor, John Brooks, Grant Trewartha, Keith Stokes
Background: Choosing an appropriate definition for injury in injury surveillance studies is essential to ensure a balance among reporting reliability, providing an accurate representation of injury risk, and describing the nature of the clinical demand. Purpose: To provide guidance on the choice of injury definition for injury surveillance studies by comparing within- and between-team variability in injury incidence with >24-hour and >7-day time-loss injury definitions in a large multiteam injury surveillance study...
March 2018: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/29563095/king-devick-concussion-test-performs-poorly-as-a-screening-tool-in-elite-rugby-union-players-a-prospective-cohort-study-of-two-screening-tests-versus-a-clinical-reference-standard
#19
Gordon Ward Fuller, Matthew J Cross, Keith A Stokes, Simon P T Kemp
BACKGROUND: The King-Devick (KD) test is an objective clinical test of eye movements that has been used to screen for concussion. We characterised the accuracy of the KD test and the World Rugby Head Injury Assessment (HIA-1) screening tools as methods of off-field evaluation for concussion after a suspicious head impact event. METHODS: A prospective cohort study was performed in elite English rugby union competitions between September 2016 and May 2017. The study population comprised consecutive players identified with a head impact event with the potential to result in concussion...
March 21, 2018: British Journal of Sports Medicine
https://www.readbyqxmd.com/read/29559318/the-ball-in-play-demands-of-international-rugby-union
#20
Benjamin T Pollard, Anthony N Turner, Robin Eager, Daniel J Cunningham, Christian J Cook, Patrick Hogben, Liam P Kilduff
OBJECTIVES: Rugby union is a high intensity intermittent sport, typically analysed via set time periods or rolling average methods. This study reports the demands of international rugby union via global positioning system (GPS) metrics expressed as mean ball in play (BiP), maximum BiP (max BiP), and whole match outputs. DESIGN: Single cohort cross sectional study involving 22 international players, categorised as forwards and backs. METHODS: A total of 88 GPS files from eight international test matches were collected during 2016...
March 3, 2018: Journal of Science and Medicine in Sport
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