Rugby Union Performance Research Articles

Mental toughness: state or trait? Context and sporting performance in rugby union, a longitudinal study

Mental toughness is a concept that has been considered a critical feature of sporting success. However, there are still conceptual issues related to its traitness and its relationship with sporting performance that remain unresolved. Consequently, the objective of this research is to contrast empirically whether the eventual changes in MT and its relationships with competition phases and sporting performance can sustain the notion of MT as a state or a trait. A longitudinal study included 12 male Chilean rugby players, aged 18-33 years, which regularly competed at the highest national level. The results indicated that there are no significant differences in mental toughness between the four measurements taken in the study and that the competitive phase did not predict mental toughness properties enduring across contexts and time. In addition, the data showed that mental toughness is an important predictor of relevant behavioural variables and sporting performance.

The association of the ACE gene I/D polymorphism and in-game performance in elite Rugby Union players

Genetic variation has been proposed as a factor in human athletic performance. The angiotensin converting enzyme (ACE) gene has been studied extensively albeit with heterogeneous results. The insertion (I) and deletion (D) alleles have been associated with altered serum and tissue ACE, as well as endurance- and power-based performance respectively. It is suggested the distinction in rugby union performance can be partly attributed to variations in the ACE gene. The aim of this study was to identify associations between the ACE I/D genetic polymorphism and in-game performance in elite (≥ 5 games at top-flight) rugby union athletes. The athlete cohort consisted of 347 Caucasian men, divided into positional groups (backs and forwards) and positional subgroups (front five, back row, halves, centres, and back three). Ethical approval was provided by Manchester Metropolitan University with written informed consent obtained from all participants. Genotyping and genotype analysis was performed using a combination of the X9 High-Throughput Genomics System (Standard BioTools) and the StepOnePlus™ Real-Time PCR System (Applied Biosystems) and their respective corresponding software. IBM SPSS Statistics 28 (SPSS, Chicago, IL) software was used to conduct Pearson's Chi-square (χ2) test of independence comparing genotype and allelic frequencies and the Kruskal-Wallis H and Mann-Whitney U tests to investigate differences between genotypes. Genotypic and allelic frequencies did not differ at the population level, nor at the positional group/subgroup levels. Performance did not differ between genotypes nor alleles at the population and positional group levels. Back row II genotypes beat more defenders than IDs (P = 0.008) but completed fewer tackles than both IDs (P = 0.05) and DDs (P = 0.013). Halfback DDs missed fewer tackles than both IDs (P = 0.003) and IIs (P = 0.01). Centre DD genotypes made more carries than IIs (P = 0.006). Back three IIs scored more tries than both IDs (P = 0.005) and DDs (P = 0.007) and made more clean breaks than IDs (P = 0.004). Most of the existing literature has been concerned with identifying the ACE gene as a marker of elite performance. To our knowledge, this is the first study to elucidate how the inter-personal differences in rugby union performance are influenced by the ACE I/D polymorphism. The findings from this study may provide novel insight into the specialisation of training and rehabilitation modalities for athletes, based on their genetic makeup.

Correlating technical and tactical, and kinematic elements: An in-depth analysis of game-related metrics and running activities in sub-elite senior male rugby union players

To comprehend the complexity of rugby union performance, it is crucial to correlate technical and tactical, and kinematic elements specifically for playing roles. Hence, this study investigated the relationship between game-related metrics and running activities in sub-elite senior males. Technical and tactical performance and running activity of 36 sub-elite senior players (age mean = 25 years; total performances = 200) were assessed in relation to 17 key performance indicators (KPIs). A series of general linear mixed models were performed to evaluate the relationship between KPIs according to roles (backs, forwards and scrum halves), including subjects and games as random effect. The main finding was that the tactical context relates distinctly running activities, and this effect varies between backs and forwards. Tackling mainly involves impacts and deceleration, whereas carrying the ball is associated with impacts and accelerations. Furthermore, the percentage of missed tackles is related to higher occurrences of acceleration events. These findings offer a more profound understanding of the physiological requirements in sub-elite rugby performance, especially given the limited evidence on the interaction between technical and tactical performance and running activities in sub-elite rugby union games. As a result, coaches and physical practitioners should design and execute diverse training sessions that consider both the tactical context and the players’ positions.

Physical and Fitness Characteristics of Elite Professional Rugby Union Players.

This study explored the physical and fitness characteristics of elite professional rugby union players and examined the relationships between these characteristics within forwards and backs. Thirty-nine elite professional rugby union players from the New Zealand Super Rugby Championship participated in this study. Body composition was measured using dual-energy X-ray absorptiometry alongside anthropometrics. Fitness characteristics included various strength, power, speed, and aerobic fitness measures. Forwards were significantly (p ≤ 0.01) taller and heavier than backs, and possessed greater lean mass, fat mass, fat percentage, bone mass, and skinfolds. Forwards demonstrated greater strength and absolute power measures than backs (p = 0.02), but were slower and possessed less aerobic fitness (p ≤ 0.01). Skinfolds demonstrated very large correlations with relative power (r = −0.84) and speed (r = 0.75) measures within forwards, while backs demonstrated large correlations between skinfolds and aerobic fitness (r = −0.54). Fat mass and fat percentage demonstrated very large correlations with speed (r = 0.71) and aerobic fitness (r = −0.70) measures within forwards. Skinfolds, fat mass, and fat percentage relate strongly to key fitness characteristics required for elite professional rugby union performance. Individual and positional monitoring is important due to the clear differences between positions.

Quantifying Collective Performance in Rugby Union.

Objectives: The aim of this study was to quantify collective experience based on cumulative shared selections of players and to assess its impact on team performance in international rugby union. We assume that the greater the experience, the better the group will perform.Methods: Scoresheets of all games involving at least one of all 10 nations participating at the Rugby Championship and the Six Nations Championship were collected from the end of the 1999 Rugby World Cup (RWC) up to the 2015 RWC. A single indicator quantifying the cumulative shared selections (CSS, the number of selections that each player has shared with the other ones) was computed for each match as a key collective experience indicator. The World Rugby Ranking points of each nation and the percentage of victories were used to estimate team performance. The study period was divided into sequences of 4 years corresponding to the period between two consecutive RWCs. For each sequence and nation, slopes and intercept of CSS trends were computed along with victory percentage and mean ranking points. Multiple linear regression analysis was used to establish the associations between team performance and experience.Results: In regards to the CSS trends, both intra- and inter-nation variability appears to exist. Positive and negative slopes can be observed for the same team from one 4-year cycle to the next. Still, CSS slope is found to be significantly associated with both ranking points (p value = 0.042, R2 = 0.13) and victory percentage (p value = 0.001, R2 = 0.42).Conclusion: The evolution of the CSS that quantifies the collective experience of a team is linked to its performance. Such an indicator could be helpful in the decision-making process of national coaching staff.

The Effect of Home Advantage on International-level Rugby Union Performance

Many teams and individual athletes prefer to compete at home, thereby benefiting from preparing in familiar surroundings, having easy access to training and coaching staff, close contact with family members and profiting from a positive crowd atmosphere. However there is little empirical evidence to show whether home advantage is beneficial, particularly in international-level rugby. PURPOSE: To investigate whether playing rugby at home advantaged teams. METHODS: In a retrospective longitudinal study, all matches (n=125) played in the 2012 Super Rugby Competition were analyzed for key performance indicators (KPI) from coded game data provided by OPTA sports data company. Matches were played in a home-away format in New Zealand, South Africa and Australia. RESULTS: Compared to playing at home, playing away from home had a detrimental effect on points scored in the first (-2.2 2.1, mean change 95% confidence limits) and second half (-3.9 2.2) of games, resulting in more wins being recorded for home games (59%). Teams playing at home were 1.4 times (95% CI 1.1-1.6) more likely to win than teams playing away from home. Compared to playing at home, playing away from home resulted in a substantial increase in missed tackles (0.9 0.9), and reduced gain lines met (-1.7 1.5) in the first half of games. CONCLUSION: Playing at home (home advantage) can have a beneficial effect on rugby KPI and thereby increase the likelihood of teams winning games.

Assessing Novices’ Game Performance in Rugby Union: The Rugby Attack Assessment Instrument (RAAI)

The application of Teaching Games for Understanding (TGfU) and Game Centered Approaches (GCA) in team sports initiation generated the need for assessing game performance. In this paper we introduce the Rugby Attack Assessment Instrument (RAAI), a tool to assess the actions of players in attack and their incidence in the generated game situations in rugby. The RAAI focuses the attention on the ball carrier during a 5 vs. 5 situation. The actions of players in possession of the ball are described and codified. A weight is allocated to each simple and combined action in relation to its tactical value. Thus, the codified actions provide a weighted Index of Performance, the team score of the RAAI. Validity and reliability were tested in two different studies. Results suggest that the RAAI is valid and reliable to assess ball carrier’s actions and their influence in attacking game situations of novice rugby union players.

The Effect of Altitude and Travel on Rugby Union Performance: Analysis of the 2012 Super Rugby Competition.

The aim of this study was to investigate whether playing rugby at altitude or after travel (domestic and international) disadvantaged teams. In a retrospective longitudinal study, all matches (N = 125) played in the 2012 Super Rugby Competition were analyzed for key performance indicators (KPI) from coded game data provided by OPTA sports data company. Matches were played in a home-away format in New Zealand, South Africa, and Australia. Teams based at sea level but playing at altitude (1,271-1,753 m) were more likely to miss tackles (mean ± 90% confidence interval, 1.4 ± 1.7) and score fewer points in the first half compared with games at sea level. In the second half of games, sea level teams at altitude were very likely to make fewer gain lines (-4.0 ± 2.7) compared with the second half of games at sea level. The decreased ability to break the defensive line, which may be the result of altitude-induced fatigue, could reduce the likelihood of scoring points and winning a game. Travel also had an effect on KPI, where international travel resulted in more missed tackles (1.7 ± 1.3) and less frequent gain lines (-3.0 ± 1.9) in the first half relative to matches at home; overall, away teams (domestic and international) scored 4 less points in the second half compared with home teams. In conclusion, playing away from home in another country, particularly at altitude, can have a detrimental effect on KPI, which may affect the overall performance and the chances of winning matches.

Tackler characteristics associated with tackle performance in rugby union

Tackling is an important skill for performance in rugby, yet little has been reported on tackler characteristics and its relationship to performance in competition. The aim of this study was to identify tackler characteristics and its association with tackle performance in matches. Eighteen matches of the 2010 Super 14 were analysed, which amounted to 2092 coded tackles. Tackler characteristics such as head position – in motion, up and forward, type of tackle – shoulder tackler, arm tackle or ball-carrier fend – absent, moderate, strong and leg drive–absent, moderate, strong or shoulder usage were coded and associated with tackle outcomes. Relative risk ratio (RRR), the ratio of the probability of an outcome occurring when a characteristic was observed (versus the non-observed characteristic) was determined using multinomial logistic regression. Having the head in motion decreased the tackler's chances of a successful tackle (RRR 2.24, 95% CI 1.72–2.92, p < 0.001) relative to an up and forward head position. Ball-carriers using a fend significantly decreased the tackler's probability of success (moderate fend RRR 2.97, 95% CI 2.04–4.31, p < 0.001). Moderate leg drive (RRR 0.36, 95% CI 0.26–0.50, p < 0.001) by the tackler increased the likelihood of tackle success. Head up and forward, counter-acting the ball-carrier fend, shoulder tackles targeted at the ball-carrier mid-torso, using the arms to wrap or pull, and leg driving were key tackler characteristics associated with positive tackle outcome in matches. Based on these findings, it is recommended that these technical characteristics are emphasised and incorporated into training to effectively prepare tacklers for competition.

Match Analysis and Player Characteristics in Rugby Sevens

Rugby sevens is a contact sport contested by two teams of seven players who compete over two 7-min halves, most frequently played in a tournament style. The IRB Sevens World Series is thought of as the preeminent rugby sevens competition in the world and has grown in competitiveness from its inception in 2000. The decision to include rugby sevens in the 2016 Olympics is likely to increase the global profile and participation in the game. Many rugby sevens players concurrently compete in 15-a-side rugby union as backs and loose forwards; however, a continued increase in the popularity of rugby sevens will likely see the emergence of the specialist rugby sevens player. Often thought of as the abbreviated version of rugby union, rugby sevens is played under nearly identical laws and on the same field dimensions as the 15-man code. However, research has shown the movement demands of rugby sevens and rugby union are dissimilar, with rugby sevens players spending a larger proportion of the game running at high intensity (≥ 5 m s(-1)). Given the dissimilarity in match demands in conjunction with differences in the competition structure between the codes, it appears the considerable depth of literature specific to performance in rugby union may be of little value for the preparation of rugby sevens players. Investigations of the physical characteristics of rugby sevens players show backs are lighter and shorter than forwards, while players across all positions possess a lean body composition. International rugby sevens players have similar speed characteristics to rugby union backs across distances of 10-30 m; however, rugby sevens players appear to have superior intermittent aerobic endurance. Despite being of likely importance, little is known of the strength and power characteristics of rugby sevens players. Research into the speed and aerobic endurance characteristics of rugby sevens players has not distinguished between backs and forwards and, as such, it is unclear whether differences exist between the position groups.

Changes in practice task constraints shape decision-making behaviours of team games players

ObjectivesThis study examined the effects of manipulating relative positioning between defenders (initial distance apart) on emergent decision-making and actions in a 1 vs. 2 rugby union performance sub-phase. DesignTwelve experienced youth players performed 80 trials of a 1 (attacker) vs. 2 (defenders) practice task in which the starting distance between defenders was systematically decreased. MethodsMovement displacement trajectories of participants were video recorded to obtain 2D positional data. The independent variable was the starting distance between defenders and dependent variables were: (i) performance outcome (try or tackle), (ii) mean speed of all players during performance, and (iii), time between the first crossover and the end of the trial. Repeated measures ANOVA was used to compare the effects of different starting distances on performance. ResultsShorter starting distances between defenders were associated with a higher frequency of effective tackle outcomes, lower mean speeds of all participants, and a greater time period between the first crossover and the end of the trial. ConclusionsDecision-making behaviours emerged as a function of changes in participants’ spatial location during performance. This observation supports the importance of manipulating key spatial-temporal variables in designing representative practice task constraints that induce functional player-environment interactions in team sports training.

Contact Skills Predicting Tackle-Breaks in Rugby Union

Contact skills are fundamental attributes of performance in rugby union. This study explored how the qualities of contact intensity and fending strategies related to tackle outcome in rugby union. Seven Super 14 games were coded using numerous quantitative and qualitative variables that assessed team patterns and individual skill execution during attacking ball carries. A variety of contact skills were shown to contribute significantly to the prediction of tackle-breaks. It was shown that 92% of tackle-breaks occurred as a result of poor defensive positioning. In addition, strong contact intensity and active fending strategies predicted 86% of poor defensive positions. Notably, active fend strategies were associated with positive phase outcomes when running straight at the defence and when using evasive methods of attack. This study provided critical insight regarding how the qualities of contact intensity and fending strategies influence effective ball carries in rugby union.

Development and application of computer-based prediction methods

The purpose of the current study was to develop an information database which accounted for as many of those variables thought to cause variance in soccer and rugby union performance as possible. These data were used to populate seven different predictive models of performance which were compared retrospectively to actual results. A total of 7 independent variables were applied to a match database 3 seasons in length for 3 English Premiership Football teams and 2 Premiership Rugby Union teams. Prediction methods included Multiple Linear Regression, Artificial Neural Networks and expert human predictions.Contrary to previous literature, soccer (57.9%) was on average predicted more successfully than Rugby Union (46.1%). Nevertheless results suggested that the ability of Artificial Intelligence and Computerised methods to predict the outcome of matches has, for the first time, surpassed that of humans.

Recurrent posterior thigh symptoms detrimental to performance in rugby union: predisposing factors.

Recurrent hamstring injury is a very common problem in rugby union, but has been largely ignored in the literature. It is concluded that a multifactorial aetiology may be present, and that these symptoms may be part of a continuum of symptoms that may lead to more serious injuries. Effective management needs to focus not just locally, but include proximal issues such as lumbo-pelvic stability and correcting lumbar spine dysfunction. The factors addressed in a prevention programme are likely to contribute to performance gains.