Youth Rugby Research Articles

A Cross-Sectional Study Assessing the Contributions of Body Fat Mass and Fat-Free Mass to Body Mass Index Scores in Male Youth Rugby Players

BackgroundIn some sports such as rugby, a large body size is an advantage, and the desire to gain weight can bring young players to become overweight or obese. The aim of this study was to evaluate the prevalence of overweight and obesity and the contribution of body fat mass index (BFMI) and fat-free mass index (FFMI) to body mass index (BMI) changes among young male rugby players (15-a-side rugby).MethodsThe criteria of the International Obesity Task Force were used to define overweight and obesity from BMI. The method of skinfold thickness was used to assess percentage of body fat (%BF), BFMI, and FFMI. Excess body fat was defined by using BFMI and %BF above the 75th percentile. Data were grouped according to the age categories of the French Rugby Federation (U11, under 11 years; U13, under 13 years; U15, under 15 years) and to BMI status (NW normal-weight versus OW/OB overweight/obese).ResultsOverall, 32.8% of the young players were overweight, and 13.8% were obese. However, 53% of young players classified as obese and overweight by BMI had an excess body fat by using BFMI above the 75th percentile. FFMI increased significantly between U11 and U13 in both groups, without significant change in BMI and BFMI. Both groups had similar significant gains in BMI and FFMI between U13 and U15, while BFMI only increased significantly in OW/OB (+ 18.5%). The strong correlations between BMI and %BF were systematically lower than those between BMI and BFMI. FFMI was strongly or moderately associated with BFMI.ConclusionsChart analysis of BFMI and FFMI could be used to distinguish changes in body composition across age categories in young male rugby players classified as normal-weight, overweight, and obese by BMI.

Epidemiology of Injury in Elite English Schoolboy Rugby Union: A 3-Year Study Comparing Different Competitions.

Injury risks in professional and community rugby union have been extensively described; however, less is known about injury epidemiology at the schoolboy level. To investigate the injury risk in English schoolboy rugby union matches, comparing an elite competition (Achieving Academic and Sporting Excellence [AASE]) with subelite matches (non-AASE). Retrospective cohort study. Rugby union academy, consisting of 16- to 19-year-old males, based at an elite sports college in England. A total of 132 participants (mean age = 17.5 years) were included in the study; 64 athletes experienced a total of 103 time-loss injuries over a 3-season period (2012-2015). All injuries were assessed and recorded by the team therapist using consensus statement definitions. Injury characteristics were recorded and compared between groups. Primary outcome measures were injury incidence (per 1000 h match exposure) and injury burden (days absent/1000 h), and rate ratios and 95% confidence intervals are presented throughout. A total of 131 matches were played (34 AASE, 97 non-AASE) and a total of 103 injuries were recorded (47 AASE, 56 non-AASE). The injury incidence in AASE matches (77/1000 h) was greater than in non-AASE matches (34/1000 h). The concussion incidence in AASE matches (20/1000 h) was 5 times that of non-AASE matches (4/1000 h). The head/face had the highest injury incidence for a specific location, followed by the shoulder region (AASE = 19/1000 h, non-AASE = 5/1000 h), which had the greatest injury burden (553/1000 h and 105/1000 h, respectively) for any specific body location. More than 50% of all injuries were associated with tackles. A much greater incidence of all injuries occurred at the highest level of competition, and the concussion incidence was greater than that reported in any previously published study of youth rugby. Given the high incidence and burden of concussions and shoulder injuries, prevention and management deserve specific focus.

Trends in time-loss injuries during the 2011-2016 South African Rugby Youth Weeks.

Youth rugby is a popular sport in South Africa (SA) with a high injury incidence. The annual SA Rugby Youth Week tournaments attract the top age-group players in the country providing a sample of players for reliable injury surveillance. The aim of the study was to analyze the changes in time-loss injury rates at the SA Rugby Youth Week tournaments between 2011 and 2016, differences between age-groups, and to investigate associated injury risk factors. All confirmed time-loss injuries at the 4 age-group tournaments (under-13, under-16, and 2 under-18) from 2011 to 2016 were recorded. Injury incidence densities (IID) for years, tournaments, and injury risk factors were calculated and Poisson regression analyses were performed to determine differences. Time-loss injuries (n=494) were reported over 24240 exposure hours, with an overall IID of 20.4 (18.6-22.2) injuries per 1000 player hours. The year 2013 had a significantly lower IID compared to 2011. Injury risk decreased with increasing age; under-13 and under-16 had significantly higher IID compared to under-18 Craven Week. Tackling was the phase of play at highest risk, with an IID of 7.4 (6.3-8.5) injuries per 1000 player hours. Central/peripheral nervous system (CNS/PNS) and, therefore, the head/neck were the most commonly occurring injuries/location injured. In conclusion, within the SA Rugby tournament structure, the older players had a decreased rate of injury. The tackle event was still the phase of play with the highest injury incidence regardless of age. This increase in incidence is largely due to an increase in CNS/PNS injuries.

Basal Markers of Inflammation, Muscle Damage, and Performance during Five Weeks of Pre-Season Training in Elite Youth Rugby League Players

Objectives: this study examined changes in basal biochemical markers of immune function and muscle damage, as well as physical performance during a typical pre-season training block in preparation for the Australian national youth rugby league competition. Methods: twelve elite youth (i.e., 18-20 yrs.) rugby league players completed 5 weeks of physical training that included 10-12 sessions per week. Anthropometry, sprint speed, anaerobic power, leg power, upper- and lower-body strength were measured pre- and post-training. Venous blood was assessed for interleukin (IL-1b, IL- 10, IL-6, TNFα) and Creatine kinase (Ck) concentrations at weekly intervals. Results: IL-1b and IL-10 concentrations were reduced from baseline after three and four weeks, respectively whereas IL-6 and TNF-α concentrations did not change over the 5-week period. Ck was increased above baseline after three weeks of training and returned to baseline at 5 weeks. Maximal bench press, hack squat, bench pull, and skinfold thickness were all improved after the 5-week training period. Conclusion: Early increases in Ck may indicate muscle damage in response to an increased volume of physical activity or unaccustomed exercise, while a return to baseline Ck levels may indicate adaptation. Increases in muscle strength confirm positive muscle adaptation and the training resulted in a reduction in basal IL-10 and TNF alpha production which could be characteristics of normal training response. From a practical perspective, the program employed in this study provided a useful training plan to increase physical qualities, and adaptation to muscle damage.

The tackle in South African youth rugby union – Gap between coaches' knowledge and training behaviour

In youth rugby union matches, tackle-related injuries account for 60% of all injuries, 62% of concussion injuries and almost 50% of spinal cord injuries (youth and amateur). Because of this high risk of injury, the inclusion of the tackle in youth rugby has been a topic of discussion in the public and a high priority research area for World Rugby. What a coach knows and his/her attitude toward player safety directly impacts the risk and performance profile of a player. The purpose of this study is to describe the tackle knowledge, attitudes and training behaviours of youth rugby coaches. The entire population of Western Province Rugby Union Premier A1 division (highest level of school rugby) under-19 rugby coaches (n = 8) completed a knowledge and attitude questionnaire and 96 field-training sessions were observed over four weeks. Coaches rated tackling (mean 3.9, 95% confidence interval 3.3–4.4), rucking (mean 3.8, 95% confidence interval 3.0–4.5) and ball-carrying (mean 3.6, 95% confidence interval 2.6–4.6) as high-risk of injury facets of play ( H = 30.8, p < 0.001). Coaching proper technique was rated as very important for safety (mean 4.6, 95% confidence interval 4.2–5.0) and performance (mean 4.8, 95% confidence interval 4.4–5.0, U = 28, p > 0.05). Of the 96 observed training sessions, tackle training was recorded 16% of the time (vs. 84% no tackle training, p < 0.001). Coaches were aware of the risk of injury in the tackle and rated the coaching of proper technique of utmost importance. These positive knowledge and attitudes did not transfer into their tackle training. The discrepancy between coaches' tackle knowledge and attitudes, and their training of the tackle might be related to how competent they believe themselves to be in delivering tackle training.

Traumatic vertebral artery dissection in high school rugby players: A report of two cases

Traumatic vertebral artery dissection (VAD) has been reported in various types of sports and recreation. However, there have been no reports of VAD in rugby players, except for those with cervical spine injuries. We experienced two cases of VAD without cervical spine injuries in high school rugby players. Attention should be paid to protect youth rugby players from VAD.

A comparison of game-play characteristics between elite youth and senior Australian National Rugby League competitions

ObjectivesTo compare game-play characteristics between elite youth and senior Australian National Rugby League (NRL) competitions. DesignLongitudinal observational. MethodsThe dataset consisted of 12 team performance indicators (e.g., ‘all runs’, ‘offloads’ and ‘tackles’) extracted from all 2016 national under 20 (U20) competition (elite youth; n=372 observations) and National Rugby League (NRL) (elite senior; n=378 observations) matches. Data was classified according to competition (Two levels: U20 and NRL) and modelled using two techniques. Firstly, non-metric multidimensional scaling resolved multivariate competition (dis)similarity, visualised using a two-dimensional ordination. Secondly, a conditional interference (CI) classification tree was grown to reveal the performance indicators most capable of explaining competition level. ResultsNon-metric multidimensional scaling revealed high competition dissimilarity, with U20 and NRL teams orienting distinctive positions on the first dimension of the ordination surface. Five team performance indicators were retained within the CI tree (‘all runs’, ‘tackle breaks’, ‘tackles’, ‘missed tackles’, and ‘kicks’), which correctly classified 79% of the U20 observations and 93% of the NRL observations. ConclusionsMultivariate differences between elite youth and senior rugby league competitions were identified. Specifically, NRL game-play was classified by a greater number of ‘all runs’, and ‘tackles’ and a lower number of ‘missed tackles’ relative to the U20 competition. Given the national U20 competition is purported to assist with the development of prospective NRL players, junior coaches may consider training interventions that primarily aid the tackling capacities of players. This may subsequently assist with talent development and player progression in Australian rugby league.

Authors\u2019 Reply to McMahon et al. Comment on: \u201cAnthropometric and Physical Qualities of Elite Male Youth Rugby League Players\u201d

Authors\u2019 Reply to McMahon et al. Comment on: \u201cAnthropometric and Physical Qualities of Elite Male Youth Rugby League Players\u201d

The association between harm avoidance personality traits and self-reported concussion history in South African rugby union players.

Personality traits have been proposed to affect the risk of sports concussion, but evidence is limited. Cloninger's Tridimensional Personality Questionnaire (TPQ) measures novelty seeking, harm avoidance (HA), and reward dependence traits. The aim of this study was to investigate the relationship between TPQ scores and concussion history in rugby union players. Cross-sectional study. Rugby players from high schools, senior amateur clubs, and professional teams provided a self-reported concussion history and completed the TPQ. Participants reporting no previous concussions formed the control group, while participants reporting concussion formed the case group. A one-way analysis of covariance, with age as a covariate, was used to examine the differences in TPQ scores between groups. Of the 309 participants, 54% reported a minimum of one concussion (junior: 47%; amateur: 52%; professional: 72%). HA scores were significantly higher in junior players without a history of concussion compared to cases (p=0.006). Specifically, the junior control group had higher "anticipatory worry" (p=0.009) and "fear of uncertainty" (p=0.008). In contrast, the professional control group had lower HA scores than cases (p=0.009), while the amateur cohort displayed no differences between control and case groups. This study identified a novel association between HA and concussion in rugby players, adding evidence to the role of personality in a multifactorial risk-model of concussion. The findings suggest that lower HA may lead to increased dangerous play in youth rugby, influencing concussion susceptibility. Contrasting associations in the professional cohort suggest further research is required to understand the role of personality in concussion.

Reducing musculoskeletal injury and concussion risk in schoolboy rugby players with a pre-activity movement control exercise programme: a cluster randomised controlled trial

BackgroundInjury risk in youth rugby has received much attention, highlighting the importance of establishing evidence-based injury reduction strategies.AimTo determine the efficacy of a movement control exercise programme in reducing injuries...

Participation trends according to relative age across youth UK Rugby League

Relative age effects in sports participation highlight the presence of a significant social and developmental inequality. To assess its prevalence, patterning, and size, this study examined participation trends of youth (ages 7–21 years) Rugby League players registered to local community clubs across the North of England ( N = 23,943). Results showed that irrespective of relative age, participation growth occurred from U8 to U12s age categories. However, from U13 to U19s, participation became differentiated with the relatively younger showing earlier and progressively lowering participation proportions (e.g. Q4s – U13–U17 = 24–17%) and were up to 50% less likely to participate (i.e. Q4 vs. Q1 – U15–U16 OR = 0.48 and 0.50). Findings highlight the substantial earlier loss of participation for the relatively younger across youth ages. Player development systems containing inherent selection and differentiation during adolescence are presented as one key process affecting the decision to participate in youth Rugby League.

Misunderstandings of concussion within a youth rugby population.

The recognition and management of concussion has become a major health concern within rugby union. Identifying misconceptions and attitudes regarding concussion is valuable for informing player education. Therefore, the purpose of this study was to explore the knowledge of, and attitudes towards, concussion in subgroups of youth rugby players. Cross-sectional survey. Information sheets and consent forms were distributed at training sessions for multiple teams at each of three schools and three clubs. Players who returned consent forms completed a custom-designed survey at a subsequent session. Two hundred and fifty-five English players, aged 11-17 years, completed the anonymous survey. Sixty-one participants reported a total of 77 concussions. Self-reported return to play ranged from 0 to 365 days; only seven players (11%) reported a return to play after the Rugby Football Union's recommendation of 23 days. Although the majority of findings relating to players' knowledge of concussion were positive, a number of important misunderstandings were revealed. While the majority of players reported positive attitudes towards concussion, a substantial minority (up to 30%) reported inappropriate attitudes in response to specific questions. Participants who played at multiple venues did report superior knowledge and attitudes relative to their peers who played at a single venue. Despite generally positive results, youth rugby players were found to hold a number of misconceptions regarding concussion which should be the focus for education initiatives. Considering general subgroups of players by concussion history, age, or playing position appears unlikely to enhance the design of concussion education programmes.

Variable Resistance Training Promotes Greater Strength and Power Adaptations Than Traditional Resistance Training in Elite Youth Rugby League Players.

Rivière, M, Louit, L, Strokosch, A, and Seitz, LB. Variable resistance training promotes greater strength and power adaptations than traditional resistance training in elite youth rugby league players. J Strength Cond Res 31(4): 947-955, 2017-The purpose of this study was to examine the strength, velocity, and power adaptations in youth rugby league players in response to a variable resistance training (VRT) or traditional free-weight resistance training (TRAD) intervention. Sixteen elite youth players were assigned to a VRT or TRAD group and completed 2 weekly upper- and lower-body strength and power sessions for 6 weeks. Training programs were identical except that the VRT group trained the bench press exercise with 20% of the prescribed load coming from elastic bands. Bench press 1 repetition maximum (1RM) and bench press mean velocity and power at 35, 45, 65, 75, and 85% of 1RM were measured before and after the training intervention, and the magnitude of the changes was determined using effect sizes (ESs). The VRT group experienced larger increases in both absolute (ES = 0.46 vs. 0.20) and relative (ES = 0.41 vs. 0.19) bench press 1RM. Similar results were observed for mean velocity as well as both absolute and relative mean power at 35, 45, 65, 75, and 85% of 1RM. Furthermore, both groups experienced large gains in both velocity and power in the heavier loads but small improvements in the lighter loads. The improvements in both velocity and power against the heavier loads were larger for the VRT group, whereas smaller differences existed between the 2 groups in the lighter loads. Variable resistance training using elastic bands may offer a greater training stimulus than traditional free-weight resistance training to improve upper-body strength, velocity, and power in elite youth rugby league players.

AN EPIDEMIOLOGICAL STUDY OF MATCH INJURIES IN YOUTH RUGBY UNION

BackgroundInjury risk in youth rugby is perceived as high when compared with other youth sports, and has become a notable public health topic.ObjectiveTo investigate the incidence and nature of match-related...

THE EFFICACY OF A MOVEMENT CONTROL EXERCISE PROGRAMME TO PREVENT INJURIES IN YOUTH RUGBY: A CLUSTER-RANDOMISED CONTROLLED TRIAL

BackgroundStructured pre-activity exercise programmes have demonstrated injury prevention in a variety of settings, but their efficacy is largely unknown in contact-orientated sports.ObjectiveTo assess the efficacy of a pre-activity movement control exercise programme to reduce injury risk in youth rugby when compared with a standardised exercise programme.DesignSingle-blind cluster-randomised controlled trial.SettingIndependent schools within England during the 2015/16 playing season.ParticipantsSchools with onsite medical provision were eligible to participate in this trial. 31 schools (intervention, 17 schools, 1,325 players; control, 14 schools, 1,127 players) completed the trial.InterventionsBoth programmes were completed for 15–20 minutes prior to main sessions, with team coaches acting as delivery agents. The intervention programme combined progressive proprioceptive, resistance, and plyometric activities. The standardised programme combined dynamic stretching, wrestling-based and speed-based activities.Main Outcome MeasuresTrial-arm comparisons were made across summary measures of time-loss (>24 hours) injuries, with effects analysed through magnitude-based inference against thresholds for the smallest worthwhile effects (RR=0.90 & 1.11).Results441 time-loss injuries (intervention, 233; control, 208) were reported across 15,953 match exposure-hours (intervention, 9,083 hours; control, 6,870 hours). Intention-to-treat analyses revealed a 15% reduction in overall match injury incidence favouring the intervention (relative risk=0.85, 90% CI 0.61–1.17, unclear effect), whilst reductions were also identified in match concussion incidence (RR=0.71, 0.48–1.05, likely beneficial effect). Per-protocol analyses revealed that completing the intervention programme compared with the control programme an average of 2x/week was associated with a further reduction in overall match injury incidence (RR=0.73, 0.45–1.20, unclear effect), whilst an average use of 3x/week halved overall match injury incidence (RR=0.50, 0.22–1.13, likely beneficial effect).ConclusionsThis study presents encouraging evidence that using a preventive exercise programme 2–3x/week prior to training and matches can reduce injury risk in youth rugby when compared with a standardised programme.

INJURIES IN AMERICAN YOUTH RUGBY-7S: AN EMERGING ADOLESCENT COLLISION SPORT

BackgroundRugby-7s growth in the United States predominantly seen in the amateur population, has very little youth rugby injury data.ObjectiveTo report incidence and causes for US youth Rugby-7s match injuries.DesignProspective descriptive...

Mechanisms and Factors Associated With Tackle-Related Injuries in South African Youth Rugby Union Players

Background: The majority of injuries in rugby union occur during tackle events. The mechanisms and causes of these injuries are well established in senior rugby union. Purpose: To use information from an injury database and assess video footage of tackle-related injuries in youth rugby union matches to identify environmental factors and mechanisms that are potentially confounding to these injuries. Study Design: Descriptive epidemiological study. Methods: Injury surveillance was conducted at the under-18 Craven Week rugby tournament. Tackle-related injury information was used to identify injury events in match video footage (role-matched noninjury tackle events were identified for the cohort of injured players). Events were coded using match situational variables (precontact, contact, and postcontact). Relative risk ratio (RRR; ratio of probability of an injury or noninjury outcome occurring when a characteristic was observed) was reported by use of logistic regression. Results: In comparison with the first quarter, injury risk was greater in the third (RRR = 9.75 [95% CI, 1.71-55.64]; P = .010) and fourth quarters (RRR = 6.97 [95% CI, 1.09-44.57]; P = .040) for ball carriers and in the fourth quarter (RRR = 9.63 [95% CI, 1.94-47.79]; P = .006) for tacklers. Ball carriers were less likely to be injured when they were aware of impending contact (RRR = 0.14 [95% CI, 0.03-0.66]; P = .012) or when they executed a moderate fend (hand-off) (RRR = 0.22 [95% CI, 0.06-0.84]; P = .026). Tacklers were less likely to be injured when performing shoulder tackles (same side as leading leg) in comparison to an arm-only tackle (RRR = 0.02 [95% CI, 0.001-0.79]; P = .037). Ball carriers (RRR = 0.09 [95% CI, 0.01-0.89]; P = .040) and tacklers (RRR = 0.02 [95% CI, 0.001-0.32]; P =.006) were less likely to be injured when initial contact was made with the tackler’s shoulder/arm instead of his head/neck. Conclusion: The relative risk of tackle-related injury was higher toward the end of matches. Incorrect technique may contribute to increased injury risk. Implementing recovery strategies between matches, training safe and effective techniques, and improving levels of conditioning may counter the negative effects of fatigue. These findings may assist stakeholders in youth rugby to formulate injury prevention strategies and may improve the preparation of field-side medical staff for managing tackle-related injuries at these or similar tournaments.

Injuries in Australian school-level rugby union

ABSTRACTThere is a high incidence of injuries in rugby union due to the physical nature of the game. In youth rugby union, there are large variations in injury rates reported. Our study investigated the rates of injuries in school-level rugby union players in Australia using the consensus statement for rugby union injuries. Injury surveillance was conducted on 480 rugby players from 1 school in Queensland, Australia. Injury data were collected using paper-based injury recording forms during the 8-week rugby season using a “medical-attention” injury definition. In total, 76 players sustained one or more injuries, with a total of 80 injuries recorded. The overall injury rate was 31.8 injuries/1000 match player hours (95% CI, 25.4–39.4). Concussion had an incidence rate of 6.0/1000 match player hours (95% CI, 3.5–9.6). The incidence of upper limb and lower limb injuries were 9.1 and 9.9/1000 match player hours, respectively (95% CI, 5.9–13.5 and 6.6–14.5). The older age divisions had higher injury rates and most injuries occurred while tackling or being tackled. The injury rates observed in this sample of Australian school rugby union players provides direction for future studies to enable informed decisions relating to development of injury prevention programmes at this level of rugby.

Usefulness of Video Review of Possible Concussions in National Youth Rugby League

A new concussion interchange rule (CIR) was introduced in 2014 for the National Rugby League and National Youth Competition (NYC). The CIR allows a player suspected of having sustained a concussion to be removed from play and assessed without an interchange being tallied against the player's team. Participants included all NYC players who used the CIR during the 2014 season. 2 raters completed video analysis of 131 (of a total of 156 reported) uses of the CIR, describing injury characteristics, situational factors, and concussion signs. The incidence rate was 44.9 (95% CI: 38.5-52.3) uses of the CIR per 1 000 NYC player match hours, or approximately one CIR use every 1.3 games. Apparent loss of consciousness/unresponsiveness was observed in 13% of cases, clutching the head in 65%, unsteadiness of gait in 60%, and a vacant stare in 23%. Most incidences occurred from a hit-up (82%). There appeared to be some instances of video evidence of injury but the athlete was cleared to return to play in the same game. Video review appears to be a useful adjunct for identifying players suffering possible concussion. Further research is required on the usefulness of video review for identifying signs of concussive injury.

Incidence and Factors Associated With Concussion Injuries at the 2011 to 2014 South African Rugby Union Youth Week Tournaments.

To determine the concussion incidence and to identify factors associated with concussion in South African youth rugby union players. Prospective cohort study. Injury surveillance was completed at the South African Rugby Union Youth Week tournaments (under-13, under-16, and under-18 age groups). South African youth rugby union players. A total of 7216 players participated in 531 matches between 2011 and 2014. None. Concussion incidence was calculated per 1000 player-match-hours with 95% CIs. Poisson regression was used to calculate the incidence rate ratio (IRR) between factors (age, time period, playing position, and activity at the time of concussion) potentially associated with concussions. The concussion incidence was 6.8/1000 player-match-hours (95% CI, 5.5-8.1) across all age groups. Under-13s (IRR, 1.5; P = 0.09) and under-16s (IRR, 1.7; P = 0.03) had higher concussion incidence rates than the under-18 age group. The incidence was higher in the third (IRR, 2.1; P = 0.04) and fourth (IRR, 2.5; P = 0.01) quarters of matches compared with the first quarter. Sixty-two percent of concussions occurred in the tackle situation. The tackler had a 4-fold greater concussion rate (IRR, 4.3; P < 0.001) compared with the ball carrier. The hooker and loose forwards had higher incidence rates than several other player positions (P < 0.05). The reported concussion incidence falls within the broad range previously reported in youth rugby. The evidence highlighted in this study may contribute to targeted concussion prevention strategies and provide a baseline against which the effectiveness of future interventions can be measured.