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https://www.readbyqxmd.com/read/30306824/caution-using-data-from-triaxial-accelerometers-housed-in-player-tracking-units-during-running
#1
Suzi Edwards, Samuel White, Seaton Humphreys, Robert Robergs, Nicholas O'Dwyer
Usage of accelerometers within player tracking devices in sport to quantify load, vertical ground reaction force (vGRF) or energy expenditure is contrary to placement guidelines. This study aimed to determine whether trunk-mounted accelerometers were a valid and reliable method to estimate thoracic segment or centre of gravity (COG) acceleration or vGRF, and the whether the elasticised harness contributes to the overestimation of acceleration. Ten male amateur rugby players performed five linear running tasks per lower limb at three speeds, twice, each with a different player tracking unit...
October 11, 2018: Journal of Sports Sciences
https://www.readbyqxmd.com/read/30300035/critical-speed-as-a-measure-of-aerobic-fitness-for-male-rugby-union-players
#2
Mark Kramer, Mark Watson, Rosa Du Randt, Robert W Pettitt
PURPOSE: To compare critical speed (CS) derived from all-out testing (AOT) for linear and shuttle running with metrics from a graded exercise test (GXT), the Yo-Yo intermittent recovery test (YYIR1), and estimation of an 800-m shuttle time-trial. METHODS: Twelve male rugby players completed a GXT, YYIR1, a linear AOT, shuttle AOTs of 25- and 50-m, and an 800-m shuttle time-trial consisting of 32 x 25-m shuttles. RESULTS: Strong linear correlations were observed between maximum oxygen uptake (V̇O2max ) and CS (m·s-1 ) derived from the linear AOT (3...
October 9, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/30299389/effect-of-velocity-based-loading-on-acceleration-kinetics-and-kinematics-during-sled-towing
#3
Ian Bentley, Jonathan K Sinclair, Steve J Atkins, John Metcalfe, Christopher J Edmundson
Bentley, I, Sinclair, JK, Atkins, SJ, Metcalfe, J, and Edmundson, CJ. Effect of velocity-based loading on acceleration kinetics and kinematics during sled towing. J Strength Cond Res XX(X): 000-000, 2018-Sled towing (ST) provides an external load in the form of a sled towed using a shoulder or waist harness and cord behind the athlete. Loading strategies have varied greatly between studies, and despite many investigations, there is little agreement on the optimum sled loading to develop the acceleration phase...
October 5, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/30289870/show-me-tell-me-encourage-me-the-effect-of-different-forms-of-feedback-on-resistance-training-performance
#4
Jonathon Weakley, Kyle Wilson, Kevin Till, Harry Banyard, James Dyson, Padraic Phibbs, Dale Read, Ben Jones
Weakley, J, Wilson, K, Till, K, Banyard, H, Dyson, J, Phibbs, P, Read, D, and Jones, B. Show me, tell me, encourage me: The effect of different forms of feedback on resistance training performance. J Strength Cond Res XX(X): 000-000, 2018-When performing resistance training, verbal kinematic feedback and visual kinematic feedback are known to enhance performance. In addition, providing verbal encouragement can assist in the attenuation of fatigue. However, the effects of these forms of feedback have never been compared...
October 4, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/30138238/anthropometric-and-physiological-characteristics-of-elite-male-rugby-athletes
#5
Jon Brazier, Mark Antrobus, Georgina K Stebbings, Stephen H Day, Peter Callus, Robert M Erskine, Mark A Bennett, Liam P Kilduff, Alun G Williams
Brazier, J, Antrobus, M, Stebbings, GK, Day, SH, Callus, P, Erskine, RM, Bennett, MA, Kilduff, LP, and Williams, AG. Anthropometric and physiological characteristics of elite male rugby athletes. J Strength Cond Res XX(X): 000-000, 2018-This is the first article to review the anthropometric and physiological characteristics required for elite rugby performance within both rugby union (RU) and rugby league (RL). Anthropometric characteristics such as height and body mass, and physiological characteristics such as speed and muscular strength, have previously been advocated as key discriminators of playing level within rugby...
August 21, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/30116113/modelling-the-hrv-response-to-training-loads-in-elite-rugby-sevens-players
#6
Sean Williams, Stephen West, Dan Howells, Simon P T Kemp, Andrew A Flatt, Keith Stokes
A systems modelling approach can be used to describe and optimise responses to training stimuli within individuals. However, the requirement for regular maximal performance testing has precluded the widespread implementation of such modelling approaches in team-sport settings. Heart rate variability (HRV) can be used to measure an athlete's adaptation to training load, without disrupting the training process. As such, the aim of the current study was to assess whether chronic HRV responses, as a representative marker of training adaptation, could be predicted from the training loads undertaken by elite Rugby Sevens players...
September 2018: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/30113915/effects-of-accentuated-eccentric-loading-on-muscle-properties-strength-power-and-speed-in-resistance-trained-rugby-players
#7
Jamie Douglas, Simon Pearson, Angus Ross, Mike McGuigan
Douglas, J, Pearson, S, Ross, A, and McGuigan, M. Effects of accentuated eccentric loading on muscle properties, strength, power, and speed in resistance-trained rugby players. J Strength Cond Res 32(10): 2750-2761, 2018-The purpose of this study was to determine the effects of slow and fast tempo resistance training incorporating accentuated eccentric loading (AEL) compared with traditional resistance training (TRT) in trained rugby players. Fourteen subjects (19.4 ± 0.8 years, 1.82 ± 0.05 m, 97.0 ± 11...
October 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/30095735/validity-and-reliability-of-methods-to-determine-barbell-displacement-in-heavy-back-squats-implications-for-velocity-based-training
#8
Brendyn B Appleby, Harry Banyard, Prue Cormie, Stuart J Cormack, Robert U Newton
Appleby, BB, Banyard, H, Cormie, P, Cormack, SJ, and Newton, RU. Validity and reliability of methods to determine barbell displacement in heavy back squats: Implications for velocity-based training. J Strength Cond Res XX(X): 000-000, 2018-The purpose of this study was to investigate the validity and reliability of methods for determining barbell displacement during heavy back squats. Twelve well-trained rugby union players (mean ± SD 1 repetition maximum [1RM] 90° squat = 196.3 ± 29.2 kg) completed 2 sets of 2 repetitions at 70, 80, and 90% of 1RM squats...
August 8, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/30088218/the-use-of-microtechnology-to-quantify-the-peak-match-demands-of-the-football-codes-a-systematic-review
#9
REVIEW
Sarah Whitehead, Kevin Till, Dan Weaving, Ben Jones
BACKGROUND: Quantifying the peak match demands within the football codes is useful for the appropriate prescription of external training load. Wearable microtechnology devices can be used to identify the peak match demands, although various methodologies exist at present. OBJECTIVES: This systematic review aimed to identify the methodologies and microtechnology-derived variables used to determine the peak match demands, and to summarise current data on the peak match demands in the football codes...
August 7, 2018: Sports Medicine
https://www.readbyqxmd.com/read/30074967/influence-of-weekly-workload-on-physical-biochemical-and-psychological-characteristics-in-professional-rugby-union-players-over-a-competitive-season
#10
Romain Dubois, Mark Lyons, Thierry Paillard, Olivier Maurelli, Jacques Prioux
Dubois, R, Lyons, M, Paillard, T, Maurelli, O, and Prioux, J. Influence of weekly workload on physical, biochemical and psychological characteristics in professional rugby union players over a competitive season. J Strength Cond Res XX(X): 000-000, 2018-This study aimed to (a) quantify the physical workload (P-WL) during training and games throughout the professional rugby season and (b) analyze the influence of the season period and weekly-WL, at short (acute) and moderate (chronic) terms, on physical, biochemical, and psychological responses during the season...
August 2, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/30057775/the-athletic-shoulder-ash-test-reliability-of-a-novel-upper-body-isometric-strength-test-in-elite-rugby-players
#11
Ben Ashworth, Patrick Hogben, Navraj Singh, Laura Tulloch, Daniel D Cohen
Objectives: Lower limb isometric tests are used to assess strength and strength asymmetries and monitor reductions in muscle force that may contribute to loss of performance and increase injury risk. Isometric tests in the upper body may be appropriate to monitor neuromuscular performance of the shoulder joint in sports involving contact and overhead actions. The aim of this study was to determine the reliability of a novel upper body isometric strength test. Methods: Eighteen elite rugby players (age 22...
2018: BMJ Open Sport & Exercise Medicine
https://www.readbyqxmd.com/read/30056315/bilateral-scapular-kinematics-asymmetries-and-shoulder-pain-in-wheelchair-athletes
#12
Barry S Mason, Riemer J K Vegter, Thomas A W Paulson, Dylan Morrissey, Jan W van der Scheer, Victoria L Goosey-Tolfrey
BACKGROUND: Shoulder pain is the most common complaint for wheelchair athletes. Scapular orientation and dyskinesia are thought to be associated with shoulder pathology, yet no previous studies have examined the bilateral scapula kinematics of wheelchair athletes during propulsion. RESEARCH QUESTION: To examine bilateral scapular kinematics of highly trained wheelchair rugby (WR) players and any associations with self-reported shoulder pain during everyday wheelchair propulsion...
September 2018: Gait & Posture
https://www.readbyqxmd.com/read/30055959/effects-of-varying-training-load-on-heart-rate-variability-and-running-performance-among-an-olympic-rugby-sevens-team
#13
Andrew A Flatt, Daniel Howells
OBJECTIVES: To evaluate weekly heart rate variability (HRV) responses to varying training load among an Olympic rugby sevens team and to assess whether HRV responses informed on training adaptation. DESIGN: Retrospective. METHODS: Natural logarithm of the root mean square of successive differences (LnRMSSD), psychometrics and training load from a rugby sevens team (n=12 males) over a 3-week period were retrospectively analyzed. Week 1 served as baseline while weeks 2 and 3 consisted of peak training loads from the 2016 Olympic preparatory period...
July 21, 2018: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/30024322/the-peak-duration-specific-locomotor-demands-and-concurrent-collision-frequencies-of-european-super-league-rugby
#14
Dan Weaving, Thomas Sawczuk, Sean Williams, Tannath Scott, Kevin Till, Clive Beggs, Rich D Johnston, Ben Jones
Understanding the most demanding passages of European Super League competition can optimise training prescription. We established positional and match half differences in peak relative distances (m·min-1 ) across durations, and the number of collisions, high-speed- and very-high-speed-distance completed in the peak 10 min period. Moving-averages (10 s, 30 s, 1 min, 5 min, 10 min) of instantaneous speed (m·s-1 ) were calculated from 25 professional rugby league players during 25 matches via microtechnology...
July 19, 2018: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29985223/jump-training-in-rugby-union-players-barbell-or-hexagonal-bar
#15
Jonathon J S Weakley, Kevin Till, Dale B Read, Cedric Leduc, Gregory A B Roe, Padraic J Phibbs, Joshua Darrall-Jones, Ben Jones
Weakley, JJS, Till, K, Read, DB, Leduc, C, Roe, GAB, Phibbs, PJ, Darrall-Jones, J, and Jones, B. Jump training in rugby union players: barbell or hexagonal bar?. J Strength Cond Res XX(X): 000-000, 2018-The countermovement jump (CMJ) is an exercise that can develop athletic performance. Using the conventional barbell (BAR) and hexagonal barbell (HEX) while jumping, the intensity can be increased. However, the bar that provides greater adaptations is unknown. Therefore, this study aimed to assess changes in loaded and unloaded CMJ with either a BAR or HEX across a 4-week mesocycle in rugby union players...
July 4, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29979279/identifying-contextual-influences-on-training-load-an-example-in-professional-rugby-union
#16
Nicholas E Dalton-Barron, Shaun J McLaren, Christopher J Black, Michael Gray, Ben Jones, Gregory Roe
Dalton-Barron, NE, McLaren, SJ, Black, CJ, Gray, M, Jones, B, and Roe, G. Identifying contextual influences on training load: an example in professional rugby union. J Strength Cond Res XX(X): 000-000, 2018-We aimed to investigate the contextual factors influencing training load (TL), as determined by session rating of perceived exertion (sRPE-TL), accumulated within a match-to-match microcycle in rugby union players. Session rating of perceived exertion-TL data were collected daily from 35 professional rugby union players from the same team in the English Championship over the course of an in-season period...
July 2, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29969577/physiological-responses-to-partial-body-cryotherapy-performed-during-a-concurrent-strength-and-endurance-session
#17
Alessandro Piras, Francesco Campa, Stefania Toselli, Rocco Di Michele, Milena Raffi
This investigation examined the effect of partial-body cryostimulation (PBC) performed in the recovery time between a strength training and an interval running (IR). Nine rugby players [age 23.7±3.6, BMI 28.0±2.6 kg/m2] were randomly exposed to two different conditions: i) PBC: 3-min at -160°C; ii) passive recovery at 21°C. We recorded the bioelectrical impedance analysis (BIA), temperature, and cardiac autonomic variables in three moments: at baseline, after strength training (R0) and after 90-min of recovery (R90)...
July 3, 2018: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/29952868/test-retest-reliability-of-a-commercial-linear-position-transducer-gymaware-powertool-to-measure-velocity-and-power-in-the-back-squat-and-bench-press
#18
Samuel T Orange, James W Metcalfe, Phil Marshall, Rebecca V Vince, Leigh A Madden, Andreas Liefeith
Orange, ST, Metcalfe, JW, Marshall, P, Vince, RV, Madden, LA, and Liefeith, A. Test-retest reliability of a commercial linear position transducer (GymAware PowerTool) to measure velocity and power in the back squat and bench press. J Strength Cond Res XX(X): 000-000, 2018-This study examined the test-retest reliability of the GymAware PowerTool (GYM) to measure velocity and power in the free-weight back squat and bench press. Twenty-nine academy rugby league players (age: 17.6 ± 1.0 years; body mass: 87.3 ± 20...
June 25, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29952634/training-periodization-over-an-elite-rugby-sevens-season-from-theory-to-practice
#19
Bruno Marrier, Yann Le Meur, Cédric Leduc, Julien Piscione, Mathieu Lacome, Germain Igarza, Christophe Hausswirth, Jean-Benoît Morin, Julien Robineau
PURPOSE: To describe the training periodization in Rugby-7s players competing in the Sevens World Series during a non-Olympic season. METHODS: Workload data were collected over a 33-week period in twelve male players participating in a full competitive season. Workload was quantified using session RPE and GPS-derived data during training and competition. Self-reported wellbeing was assessed using a questionnaire. Each variable was analysed weekly and through 5 mesocycles (Pre-season, In-season 1-4), each of which ended with competition blocks...
June 28, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29927891/using-sprint-velocity-decrement-to-enhance-acute-sprint-performance
#20
Darryl J Cochrane, Daniel Monaghan
Cochrane, DJ and Monaghan, D. Using sprint velocity decrement to enhance acute sprint performance. J Strength Cond Res XX(X): 000-000, 2018-Acute sled towing has the capability to elicit a potentiation. Currently, sled loading is determined from body mass (BM) percent. However, it may be more relevant to use a percentage of maximal sprint reduction to determine an individual's load. The purpose of this study was to determine if individualizing sled loads at 35 and 55% reduction in velocity would improve 20-m sprint performance...
June 20, 2018: Journal of Strength and Conditioning Research
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