scholarly journals The Physical Characteristics of Specific Phases of Play During Rugby Union Match Play

2018 ◽  
Vol 13 (10) ◽  
pp. 1331-1336 ◽  
Author(s):  
Dale B. Read ◽  
Ben Jones ◽  
Sean Williams ◽  
Padraic J. Phibbs ◽  
Josh D. Darrall-Jones ◽  
...  
Keyword(s):  
Rugby Union ◽  
Physical Characteristics ◽  
Effect Sizes ◽  
Relative Distance ◽  
Linear Mixed Effects Model ◽  
Match Play ◽  
Linear Mixed Effects ◽  
Video Footage ◽  
Dependent Variables ◽  
Attack And Defense

Purpose: To quantify the frequencies and timings of rugby union match-play phases (ie, attacking, defending, ball in play [BIP], and ball out of play [BOP]) and then compare the physical characteristics of attacking, defending, and BOP between forwards and backs. Methods: Data were analyzed from 59 male rugby union academy players (259 observations). Each player wore a microtechnology device (OptimEye S5; Catapult, Melbourne, Australia) with video footage analyzed for phase timings and frequencies. Dependent variables were analyzed using a linear mixed-effects model and assessed with magnitude-based inferences and Cohen d effect sizes (ES). Results: Attack, defense, BIP, and BOP times were 12.7 (3.1), 14.7 (2.5), 27.4 (2.9), and 47.4 (4.1) min, respectively. Mean attack (26 [17] s), defense (26 [18] s), and BIP (33 [24] s) phases were shorter than BOP phases (59 [33] s). The relative distance in attacking phases was similar (112.2 [48.4] vs 114.6 [52.3] m·min−1, ES = 0.00 ± 0.23) between forwards and backs but greater in forwards (114.5 [52.7] vs 109.0 [54.8] m·min−1, ES = 0.32 ± 0.23) during defense and greater in backs during BOP (ES = −0.66 ± 0.23). Conclusions: Total time in attack, defense, and therefore BIP was less than BOP. Relative distance was greater in forwards during defense, whereas it was greater in backs during BOP and similar between positions during attack. Players should be exposed to training intensities from in-play phases (ie, attack and defense) rather than whole-match data and practice technical skills during these intensities.

scholarly journals The physical characteristics of match-play in English schoolboy and academy rugby union

2017 ◽  
Vol 36 (6) ◽  
pp. 645-650 ◽  
Author(s):  
Dale B. Read ◽  
Ben Jones ◽  
Padraic J. Phibbs ◽  
Gregory A. B. Roe ◽  
Joshua Darrall-Jones ◽  
...  
Keyword(s):  
Rugby Union ◽  
Physical Characteristics ◽  
Match Play

scholarly journals Acceleration-Based Running Intensities of Professional Rugby League Match Play

2016 ◽  
Vol 11 (6) ◽  
pp. 802-809 ◽  
Author(s):  
Jace A. Delaney ◽  
Grant M. Duthie ◽  
Heidi R. Thornton ◽  
Tannath J. Scott ◽  
David Gay ◽  
...  
Keyword(s):  
Moving Average ◽  
Rugby League ◽  
Relative Distance ◽  
Energetic Cost ◽  
Moving Averages ◽  
Match Play ◽  
Absolute Volume ◽  
Inference Network ◽  
Acceleration And Deceleration ◽  
Attack And Defense

Rugby league involves frequent periods of high-intensity running including acceleration and deceleration efforts, often occurring at low speeds.Purpose:To quantify the energetic cost of running and acceleration efforts during rugby league competition to aid in prescription and monitoring of training.Methods:Global positioning system (GPS) data were collected from 37 professional rugby league players across 2 seasons. Peak values for relative distance, average acceleration/deceleration, and metabolic power (Pmet) were calculated for 10 different moving-average durations (1–10 min) for each position. A mixed-effects model was used to assess the effect of position for each duration, and individual comparisons were made using a magnitude-based-inference network.Results:There were almost certainly large differences in relative distance and Pmet between the 10-min window and all moving averages <5 min in duration (ES = 1.21–1.88). Fullbacks, halves, and hookers covered greater relative distances than outside backs, edge forwards, and middle forwards for moving averages lasting 2–10 min. Acceleration/deceleration demands were greatest in hookers and halves compared with fullbacks, middle forwards, and outside backs. Pmet was greatest in hookers, halves, and fullbacks compared with middle forwards and outside backs.Conclusions:Competition running intensities varied by both position and moving-average duration. Hookers exhibited the greatest Pmet of all positions, due to high involvement in both attack and defense. Fullbacks also reached high Pmet, possibly due to a greater absolute volume of running. This study provides coaches with match data that can be used for the prescription and monitoring of specific training drills.

Physical and Physiological Demands of Elite Rugby Union Officials

2018 ◽  
Vol 13 (9) ◽  
pp. 1199-1207 ◽  
Author(s):  
Matthew R. Blair ◽  
Nathan Elsworthy ◽  
Nancy J. Rehrer ◽  
Chris Button ◽  
Nicholas D. Gill
Keyword(s):  
Heart Rate ◽  
Global Positioning System ◽  
Rugby Union ◽  
Effect Sizes ◽  
Relative Distance ◽  
Positioning System ◽  
Total Distance ◽  
Global Positioning ◽  
Physiological Demands ◽  
Physical Preparation

Purpose: To examine the movement and physiological demands of rugby union officiating in elite competition. Methods: Movement demands of 9 elite officials across 12 Super Rugby matches were calculated, using global positioning system devices. Total distance (in m), relative distance (in m·min−1), and percentage time spent in various speed zones were calculated across a match. Heart-rate (HR) responses were also recorded throughout each match. Cohen d effect sizes were reported to examine the within-match variations. Results: The total distance covered was 8030 (506) m, with a relative distance of 83 (5) m·min−1 and with no differences observed between halves. Most game time was spent at lower movement speeds (76% [2%]; <2.0 m·s−1), with large effects for time spent >7.0 m·s−1 between halves (d = 2.85). Mean HR was 154 (10) beats·min−1 (83.8 [2.9]%HRmax), with no differences observed between the first and second halves. Most game time was spent between 81%HRmax and 90%HRmax (40.5% [7.5%]) with no observable differences between halves. Distances covered above 5.1 m·s−1 were highest during the first 10 min of a match, while distance at speeds 3.7 to 5 m·s−1 decreased during the final 10 min of play. Conclusions: These findings highlight the highly demanding and intermittent nature of rugby union officiating, with only some minor variations in physical and physiological demands across a match. These results have implications for the physical preparation of professional rugby union referees.

scholarly journals Padded Headgear does not Reduce the Incidence of Match Concussions in Professional Men’s Rugby Union: A Case-control Study of 417 Cases

2021 ◽  
Author(s):  
Keith A. Stokes ◽  
Matthew Cross ◽  
Sean Williams ◽  
Carly McKay ◽  
Brent E. Hagel ◽  
...  
Keyword(s):  
Odds Ratio ◽  
Head Injuries ◽  
Median Number ◽  
Case Control ◽  
Rugby Union ◽  
Return To Play ◽  
Injury Incidence ◽  
Video Footage ◽  
Four Seasons ◽  
Nested Case Control

AbstractConcussion is the most common match injury in rugby union. Some players wear padded headgear, but whether this protects against concussion is unclear. In professional male rugby union players, we examined: (i) the association between the use of headgear and match concussion injury incidence, and (ii) whether wearing headgear influenced time to return to play following concussion. Using a nested case-control within a cohort study, four seasons (2013–2017) of injury data from 1117 players at the highest level of rugby union in England were included. Cases were physician-diagnosed concussion injuries. Controls were other contact injuries (excluding all head injuries). We determined headgear use by viewing video footage. Sixteen percent of cases and controls wore headgear. Headgear use had no significant effect on concussion injury incidence (adjusted odds ratio=1.05, 95% CI: 0.71–1.56). Median number of days absent for concussion whilst wearing headgear was 8 days, compared with 7 days without headgear. Having sustained a concussion in the current or previous season increased the odds of concussion more than four-fold (odds ratio=4.55, 95% CI: 3.77–5.49). Wearing headgear was not associated with lower odds of concussions or a reduced number of days' absence following a concussion.

scholarly journals Cerebral and Somatic Oxygen Saturation in Neonates with Congenital Heart Disease before Surgery

2021 ◽  
Vol 10 (11) ◽  
pp. 2455
Author(s):  
Mi Jin Kim ◽  
Jae Suk Baek ◽  
Jung A Kim ◽  
Seul Gi Cha ◽  
Jeong Jin Yu
Keyword(s):  
Time Trends ◽  
Biochemical Parameters ◽  
Near Infrared ◽  
Mixed Effects ◽  
Contributing Factors ◽  
Linear Mixed Effects Model ◽  
Linear Mixed Effects ◽  
Hypoxic Brain Injury ◽  
Hypoxic Brain ◽  
Cardiac Diagnosis

BACKGROUND: We investigated preoperative cerebral (ScO2) and abdominal (StO2) regional oxygen saturations according to cardiac diagnosis in neonates with critical CHD, their time trends, and the clinical and biochemical parameters associated with them. METHODS: Thirty-seven neonates with a prenatal diagnosis of CHD were included. ScO2 and StO2 values were continuously evaluated using near-infrared spectroscopy. Measurements were obtained hourly before surgery. A linear mixed effects model was used to assess the effects of time and cardiac diagnosis on regional oxygenation and to explore the contributing factors. RESULTS: Regional oxygenation differed according to cardiac diagnosis (p < 0.001). ScO2 was lowest in the patients with severe atrioventricular valvar regurgitation (AVVR) (48.1 ± 8.0%). StO2 tended to be lower than ScO2, and both worsened gradually during the period between birth and surgery. There was also a significant interaction between cardiac diagnosis and time. The factors related to ScO2 were hemoglobin and arterial saturation, whereas no factor was associated with StO2. CONCLUSIONS: Preoperative ScO2 and StO2 in critical CHD differed according to cardiac diagnosis. ScO2 in the patients with severe AVVR was very low, which may imply cerebral hypoxia. ScO2 gradually decreased, suggesting that the longer the time to surgery, the higher the risk of hypoxic brain injury.

Cognate similarity and intervocalic /d/ production in Riverense Spanish

2021 ◽  
pp. 136700692199680
Author(s):  
Michael Gradoville ◽  
Mark Waltermire ◽  
Avizia Long
Keyword(s):  
Language Contact ◽  
Mixed Effects ◽  
Frequency Effect ◽  
Acoustic Measurements ◽  
Linear Mixed Effects Model ◽  
Phonetic Variation ◽  
Linear Mixed Effects ◽  
Contact Language ◽  
The Relationship ◽  
Phonetic Realization

Aims and objectives: While previous research has shown that phonetic variation in language contact situations is affected by whether a word has a cognate in the contact language, this paper aims to show that such an effect is not monotonic. According to the usage-based model, items in memory are organized according to similarity, thus we anticipated that formally more similar cognates would show a stronger cognate effect. Methodology: This variationist sociophonetic study investigates the relationship between cognate similarity and phonetic realization. We examined this relationship in the bilingual community of Rivera, Uruguay, in which both Portuguese and Spanish are spoken with regularity. Specifically, we focused on intervocalic /d/, which in monolingual Spanish is realized as an approximant [ð̞] or phonetic zero, but in monolingual Brazilian Portuguese is produced as a stop [d] or, in most varieties, an affricate [ʤ] before [i]. Data and analysis: We analyzed a corpus of sociolinguistic interviews of the Spanish spoken in Rivera. Acoustic measurements were taken from approximately 60 tokens each from 40 different speakers. Using a linear mixed-effects model, we examined the relationship between several predictors and the degree of constriction of intervocalic /d/. Findings/conclusions: While there is an overall frequency effect whereby more frequent words exhibit less constriction of intervocalic /d/, as both frequency and cognate similarity increase, less constriction of intervocalic /d/ obtains. Therefore, frequent cognates in Portuguese that have very similar forms affect the production of intervocalic /d/ more so than other cognates. Originality: No previous study has demonstrated that the cognate effect on phonetic variation in a situation of language contact is regulated by form similarity between cognate pairs. Significance/implications: The data support the usage-based model in that similar cognates have more lexical connections and can therefore show greater influence on phonetic realization than can cognates that share less phonetic material.

scholarly journals Increased Response to Altered Auditory Feedback in Dyslexia: A Weaker Sensorimotor Magnet Implied in the Phonological Deficit

2017 ◽  
Vol 60 (3) ◽  
pp. 654-667 ◽  
Author(s):  
Mark R. van den Bunt ◽  
Margriet A. Groen ◽  
Takayuki Ito ◽  
Ana A. Francisco ◽  
Vincent L. Gracco ◽  
...  
Keyword(s):  
Native Speakers ◽  
Reading Group ◽  
Linear Mixed Effects Model ◽  
Phonological Representations ◽  
Linear Mixed Effects ◽  
Phonological Deficit ◽  
Adaptation Response ◽  
After Effect ◽  
Effect Phase ◽  
Phonological Abilities

Purpose The purpose of this study was to examine whether developmental dyslexia (DD) is characterized by deficiencies in speech sensory and motor feedforward and feedback mechanisms, which are involved in the modulation of phonological representations. Method A total of 42 adult native speakers of Dutch (22 adults with DD; 20 participants who were typically reading controls) were asked to produce /bep/ while the first formant (F1) of the /e/ was not altered (baseline), increased (ramp), held at maximal perturbation (hold), and not altered again (after-effect). The F1 of the produced utterance was measured for each trial and used for statistical analyses. The measured F1s produced during each phase were entered in a linear mixed-effects model. Results Participants with DD adapted more strongly during the ramp phase and returned to baseline to a lesser extent when feedback was back to normal (after-effect phase) when compared with the typically reading group. In this study, a faster deviation from baseline during the ramp phase, a stronger adaptation response during the hold phase, and a slower return to baseline during the after-effect phase were associated with poorer reading and phonological abilities. Conclusion The data of the current study are consistent with the notion that the phonological deficit in DD is associated with a weaker sensorimotor magnet for phonological representations.

Short-form 6D assessment in compression module of the American College of Phlebology Patient Reported Outcome Venous Registry

2017 ◽  
Vol 33 (6) ◽  
pp. 425-429 ◽  
Author(s):  
Yung-Wei Chi ◽  
Blythe Durbin-Johnson ◽  
Marlin Schul
Keyword(s):  
Short Form ◽  
Patient Reported Outcome ◽  
Compression Stockings ◽  
Test Analysis ◽  
Linear Mixed Effects Model ◽  
Linear Mixed Effects ◽  
Time Period ◽  
Patient Reported ◽  
Registry Analysis

Objective The goal of this American College of Phlebology Patient Reported Outcome Venous Registry analysis was to examine the clinical efficacy of compression stockings using short-form 6D questionnaire (SF-6D). Method SF-6D scores were modeled over time using linear mixed effects model. Changes of SF-6D score from baseline to the last encounter were examined using a paired t-test. Analysis of variance was used to compare changes from baseline in SF-6D scores between C classifications. All analyses were conducted using SAS software, version 9.4 (SAS Institute, Cary NC). Results Baseline mean SF-6D score was 0.83 and at follow-up, 0.85. Mean SF-6D change was +0.02 points (P = .001) over an average time period of 5.5 months. Patients’ SF-6D scores were estimated to increase by +0.03 points (P = .005) per year of usage of compression stockings. SF-6D score changes across C classifications did not demonstrate significant differences (P = .265). Conclusion There was an improvement of SF-6D score in the registry participants who used circular knit compression stockings.

Attitude and behaviour of junior rugby union players towards tackling during training and match play

2012 ◽  
Vol 50 (2) ◽  
pp. 266-284 ◽  
Author(s):  
Sharief Hendricks ◽  
Esme Jordaan ◽  
Michael Lambert
Keyword(s):  
Rugby Union ◽  
Match Play
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