Different Levels Of Play Research Articles

The role of promotions and other factors in attendance for minor league baseball – a study across all levels of play

PurposeThe main purpose of this research was to determine what types of promotions increase Minor League Baseball attendance across all of the official leagues. The secondary purpose was to ascertain the role of other control variables such as win percentage, weather, days of the week, start time and city demographics. The research also includes a grouping of cities through k-means clustering to better understand what types of promotions work in what cities.Design/methodology/approachData were gathered on all the Minor League Baseball teams and their respective cities. Regression models were run to test for the role of individual promotions (structured as dummy variables) and other controls. One model specification used city demographic variables, one used city fixed effects rather than city demographics and the final specification used k-means clustering to separate cities into distinct groups.FindingsPromotions generally were found to increase attendance, although there were differences across levels of play. K-means clustering helped with the grouping of cities to ascertain which types of promotions were beneficial when comparing large metropolitan areas to high-income cities.Research limitations/implicationsPromotions were grouped into common categories, although some were difficult to classify (or were infrequent), so a miscellaneous promotions category was included to capture these promotions in Minor League Baseball.Practical implicationsThe findings of this research are beneficial to those designing promotional schedules for individual teams. It also is beneficial to the leagues as the findings have implications as it relates to what fans desire to see when attending minor league games.Originality/valueThe originality in this work is the collection of all Minor League Baseball attendance, city information and promotional information across the different levels of play (AAA, AA, High-A and A). Using different model specifications and groupings, including k-means clustering to match similar cities, successful promotions were identified.

Enhancing Protocols for Concussion Management in Professional Soccer Events.

Every year, there are an estimated 1.7 to 3.8 million sports-related traumatic brain injuries. A sports concussion results from an external force or a blow to the head or body, causing cranial encephalic trauma that can affect motor skills and brain function, producing varying symptoms related to an alteration in neurological functioning. Soccer poses a risk of concussions due to heading, where the player's head directly hits the ball to redirect or accelerate it. However, most concussions are caused by contact between players, such as head-to-head or head-to-elbow contact. This study analyzed the incidence of concussions or mild traumatic brain injuries in professional soccer during the "Copa America 2019"to understand the feasibility of soccer concussion protocols and propose evidence-based enhancements. The data were previously collectedby our first two authors, O. Pangrazioand F. Forriol, during the 46th edition of the "Copa America 2019," where the South American Football Confederation implementedthe Concussion Fast Recognition Protocolto detect traumatic brain injuries. The descriptive basic data will help to raise awareness and motivate further research in this field. We have analyzed and correlated it with global data to provide a comprehensive review and tangible evidence of the population size where soccer protocols are typically applied, thus calculating incidence rates to measure it mathematically. Our study reveals that the incidence rate of concussions during the "Copa America 2019"was 5.3 per 1,000 athlete exposures, with a total of three concussions occurring among 567 players. Despite the effectiveness of current protocols in detecting concussions rapidly and accurately, the relatively low incidence rate at this level of professional competition poses a challenge to validating these protocols. These results indicate that while the protocols in place are efficient, the testing and validation of new tools and approaches would be more beneficial at different levels of play where the incidence rates of concussions are higher. In environments with a greater frequency of concussions, the robustness and reliability of these protocols can be more thoroughly evaluated, ensuring they provide optimal protection and care for athletes. The incidence of concussions is low in professional soccer tournaments. Protocols are necessary to protect players and educate sports professionals. However, their validation is difficult given the low incidence of concussions at this level of competition. Our proposed protocol helps unify a basic approach in the field and an advanced approach in any emergency department, providing better detection of concussions and improved outcomes for players. This protocol should be validated in populations with higher incidence rates to demonstrate its effectiveness.

Headers and concussions in elite female and male football: a pilot study.

Heading is a risk factor for neurogenerative disease in football. However, the exposure to heading in elite football training is understudied. The primary purpose of this study was to determine the exposure to headers in elite men's and women's football and to describe the effects of the headers on ocular markers. Exposure to headers was observed over three days of women's and men's football. The number of headers at each session was determined through video analysis, and the G-force was determined via an impact tracker. Ocular markers were assessed at the start and end of the three days, and the results were compared to determine if there were any changes. Self-reported exposure to heading was recorded after each session and compared to the number of headers observed through video analysis, to assess the validity of players' self-reporting. Female players made an average of 11 headers per player per session. Ninety percent of the headers were below 10G, and none were above 80G. Male players made an average of three headers per player per session, with 74% of the headers recording a G-force above 10G and 3% above 80G. No meaningful changes were observed post-session in the ocular markers, and no concussions were observed. Neither cohort was able to accurately self-report exposure to headers. Longitudinal studies should be designed and conducted across different levels of play in both women and men's football as a prerequisite to develop evidence-based measures to prevent or mitigate the potential risks associated with headers and concussions in elite football.

The Role of the Hand Surgery Consultant in the Management of the High School and Collegiate Athlete.

For the purpose of this article, we will not use individual sports as the primary delineator; however, the two different levels of play: High School and Collegiate. We plan to share insight that we have gained through decades of practice treating High School sports and collegiate athletes. This article offers readers reliable guidance on not only treating the athlete's hand but understanding the person as a whole and the struggles at each level of play.

High injury rates and weak injury prevention strategies in football referees at all levels of play.

Football referees need other physiological requirements on field than football players and are affected by different types of injury. The absence of referees may result in canceled matches, so special focus should be placed on injury prevention through specific training programs for referees. This study retrospectively analyzed injury occurrence and prevention strategies for German football referees at the different levels of play over one season. Data were collected by means of seasonal injury reports based on the consensus statement of injury definition and data collection. Of the 923 participating referees, 91 (9.9%) played at the professional level, 151 (16.3%) at the semi-professional, and 681 (73.8%) at the amateur level. 86.2% (n=796) were men and 13.8% (n=127) women. Referees at the amateur level showed the highest injury incidence (3.14/1000h football) compared to referees at the semi-professional (1.92/1000h; p<0.001) and professional level (1.01/1000h; p<0.001). Most referees at the amateur (n=372; 56.4%) and semi-professional level (n=46; 31.3%) conducted warm-up programs of <10min, whereas the mean warm-up duration of professional referees was >11min (n=75; 82.4%). Although running and stretching exercises were common among referees during warm-up, preventive exercises focusing on coordination and trunk muscles were less frequent, especially among amateur referees (jumping: 15.9%; strengthening: 9.7%; balance exercises: 7.9%). Injury incidence was highest at lower amateur levels, which thus has specific need for injury prevention. Appropriate training exercises to prevent injuries of referees were weak at all levels of play, especially the lack of strength, plyometric, and balance exercises in training and warm-up programs.

Header biomechanics in youth and collegiate female soccer

Concerns about the effects of intentional heading in soccer have led to regulatory restrictions on headers for youth players. However, there is limited data describing how header exposure varies across age levels, and few studies have attempted to compare head impact exposure across different levels of play with the same sensor. Additionally, little is known about the biomechanical response of the brain to header impacts. The objective of this study was to evaluate head kinematics and the resulting tissue-level brain strain associated with intentional headers among youth and collegiate female soccer players. Six youth and 13 collegiate participants were instrumented with custom mouthpiece-based sensors measuring six-degree-of-freedom head kinematics of headers during practices and games. Kinematics of film-verified headers were used to drive impact simulations with a detailed brain finite element model to estimate tissue-level strain. Linear and rotational head kinematics and strain metrics, specifically 95th percentile maximum principal strain (ε1,95) and the area under the cumulative strain damage measure curve (VSM1), were compared across levels of play (i.e., youth vs. collegiate) while adjusting for session type and ball delivery method. A total of 483 headers (n=227 youth, n=256 collegiate) were analyzed. Level of play was significantly associated with linear acceleration, rotational acceleration, rotational velocity, ε1,95, and VSM1. Headers performed by collegiate players had significantly greater mean head kinematics and strain metrics compared to those performed by youth players (all p<.001). Targeted interventions aiming to reduce head impact magnitude in soccer should consider factors associated with the level of play.

The Effects of Headgear in High School Girls' Lacrosse.

Background:Girls’ lacrosse headgear that met the ASTM International performance standard (ASTM F3137) became available in 2017. However, the effects of headgear use on impact forces during game play are unknown.Purpose:To evaluate potential differences in rates, magnitudes, and game-play characteristics associated with verified impacts among players with and without headgear during competition.Study Design:Cohort study; Level of evidence, 3.Methods:A total of 49 female high school participants (mean age, 16.2 ± 1.2 years; mean height, 1.66 ± 0.05 m; mean weight, 61.2 ± 6.4 kg) volunteered for this study, which took place during the 2016 (no headgear; 18 games) and 2017 (headgear; 15 games) seasons. Wearable sensors synchronized with video verification were used. Descriptive statistics, impact rates, and chi-square analyses described impacts and game-play characteristics among players with and without headgear. Differences in mean peak linear acceleration (PLA) and peak rotational velocity (PRV) between the no headgear and headgear conditions were evaluated using a linear generalized estimating equation regression model to control for repeated within-player measurements.Results:Overall, 649 sensor-instrumented player-games were recorded. A total of 204 impacts ≥20g recorded by the wearable sensors were verified with video analysis (102 no headgear; 102 headgear). Most impacts were imparted to the player’s body (n = 152; 74.5%) rather than to the player’s head (n = 52; 25.5%). Impact rates per player-game did not vary between the no headgear and headgear conditions (0.30 vs 0.34, respectively; impact rate ratio, 0.88 [95% CI, 0.37-2.08]). There was no association between impact frequency by mechanism or penalties administered between the no headgear and headgear conditions for overall or direct head impacts. The generalized estimating equation model estimated a significant reduction in mean impact magnitudes overall (PLA: –7.9g [95% CI, –13.3 to –2.5]; PRV: –212 deg/s [95% CI, –359 to –64]) with headgear relative to no headgear. No game-related concussions were reported during this study.Conclusion:Lacrosse headgear use was associated with a reduction in the magnitude of overall impacts but not a significant change in the rate of impacts, how they occur, or how penalties were administered for impacts sustained during competition. Further research is needed with a larger sample and different levels of play to evaluate the consequences of headgear use in girls’ lacrosse.

Tackle and ruck technique proficiency within academy and senior club rugby union

ABSTRACTThis study examined the validity of a tool that assesses tackle and ruck technique in training and established reference data for tackle, ball-carry and ruck technique at different levels of play in rugby union. One hundred and thirty-one amateur rugby union players; 37 senior, 51 first-grade academy and 43 second-grade academy players, participated in a two-on-two contact drill. The drill was filmed and the players’ tackle, ball-carry and ruck technique were assessed using standardized technical criteria. Senior level players scored significantly higher in all three assessments; tackle technique senior vs academy 1st (p < 0.01, effect size (ES) = 0.7, moderate), senior vs academy 2nd (p < 0.01, ES = 0.7, moderate); ball-carry technique senior vs academy 1st (p < 0.01, ES = 0.6, moderate), senior vs academy 2nd (p < 0.01, ES = 0.8, moderate); ruck technique senior vs academy 1st (p < 0.01, ES = 0.7, moderate), senior vs academy 2nd (p < 0.01, ES = 0.4, small). These findings emphasize the importance of developing contact technique to allow players to progress to higher levels, and provide validity to an assessment tool which can facilitate this process.

The Effect of Protective Headgear on Frequency and Magnitude of Impacts in Girls’ High School Varsity Lacrosse

Abstract Purpose In an effort to reduce head and facial injuries in girls’ lacrosse, ASTM F3137-approved headgear for girls’ lacrosse was developed. However, the effect of wearing headgear on impacts during girls’ lacrosse game play is unknown. This study aimed to evaluate differences in impact rates and magnitudes across two conditions (No Headgear, and Headgear) during girls’ lacrosse games. Methods Thirty-five female participants (16.2±1.2years, 1.66±0.05m, 61.2±6.4kg) volunteered for this study during 18 games in the 2016 (No Headgear), and 15 games in the 2017 (Headgear) lacrosse seasons. All participants were instrumented with wearable sensors (X2 Biosystems) prior to each game paired with video verification. Results There were a total of 700 sensor-instrumented player-games. A total of 204 impacts ≥ 20g recorded by the wearable sensors were verified using video analysis (102 No Headgear; 102 Headgear). Impact rates did not vary between the No Headgear and Headgear conditions (0.27 vs 0.31 AEs/per team game, IRR=0.87, 95% CI=0.66, 1.14). The No Headgear condition experienced higher magnitudes (median peak linear acceleration (PLA)=26.9g and peak rotational velocity (PRV)=1578.6 deg/s) than the Headgear conditions (median PLA=24.7g; Z= –2.6, P&lt;. 0.01 and PRV=1304.2 deg/s; Z = –2.6, P&lt;. 0.01). No game-related concussions were reported during this two-year study. Conclusion There were no meaningful differences between impact rates and only slight differences in impact magnitudes in the No Headgear and Headgear groups. Further research should be conducted with a larger sample and different levels of play to evaluate the consequences of ASTM F3137-approved headgear on impacts, injury risk, and game play.

Influence of Physical Aspects and Throwing Velocity in Opposition Situations in Top-Elite and Elite Female Handball Players.

The relationship between anthropometric and physical characteristics of female handball players and throwing velocity is considered an important factor in handball performance. The aim of this study was to examine key differences in anthropometric and fitness characteristics between top elite and elite female players competing in the first Spanish handball league. A total of 89 players from the first Spanish handball league were divided into two groups, top elite (38) and elite (51) players, and assessed for anthropometric and fitness characteristics (throwing velocity, vertical jump and hand grip strength). A Student’s t-test was used to determine whether a statistically significant difference between the two different levels of play occurred. Significant differences were found in age, body height, body mass, arm span, muscle mass, different girths (tensed and flexed arm, forearm, wrist, ankle), dominant hand width and length, different breadths (biacromial, bitrochanteric, bistyloid breadth and biepicondylar humerus) and fitness characteristics (hand grip strength and throwing velocity for different positions). Top elite players compared to elite players showed differences in anthropometric characteristics which were mainly located in the upper limbs and mostly were nonmodifiable aspects by training. Furthermore, the best players were able to maintain a high throwing velocity in different tactical situations.

Groin Problems in Male Soccer Players Are More Common Than Previously Reported

Background: The majority of surveillance studies in soccer have used a time-loss injury definition, and many groin problems result from overuse, leading to gradually increasing pain and/or reduced performance without necessarily causing an absence from soccer training or match play. Thus, the magnitude of groin problems in soccer has probably been underestimated in previous studies based on traditional injury surveillance methods. Purpose: To investigate the prevalence of groin problems among soccer players of both sexes and among male soccer players at different levels of play through a new surveillance method developed to capture acute and overuse problems. Study Design: Descriptive epidemiology study. Methods: We registered groin problems during a 6-week period of match congestion using the Oslo Sports Trauma Research Center Overuse Injury Questionnaire. A total of 240 players from 15 teams across different levels of play and from both sexes were included, and they responded to the weekly questionnaire. We calculated the average weekly prevalence of all groin problems and substantial groin problems. Results: Of the 240 players, 112 male players (59%) and 20 female players (45%) reported at least 1 episode of groin problems. The average weekly prevalence of any groin problem and substantial groin problem for all male players was 29% (range, 23%-32% across different levels) and 10% (7%-13%), respectively. Elite male players had an increased risk of experiencing groin problems (odds ratio: 3.1, 95% CI: 1.5-6.4, P = .03) compared with elite female players. There was no difference in the risk of experiencing groin problems among elite, subelite, and amateur male players. For substantial problems, there was no difference between elite male and elite female players or among levels of play for senior male soccer players. Conclusion: We found a high prevalence of groin problems among male soccer players during a period with match congestion. Time-loss definition as used in previous injury surveillance studies captured only one-third of the male groin problems registered with the new method. Elite male players had 3 times’ higher risk of reporting groin problems as compared with elite female players, while playing level did not influence the risk of reporting a groin problem among males.

Comparisons of performance indicators between Super Rugby and Currie cup competition during 2014 season

Previous studies on differences in level of competition in rugby focused on physiological and psychological components, yet little research is available on comparing performance indicators between different levels of play. This study attempted to compare performance indicators of Currie Cup and Super Rugby, and to differentiate between the winning and losing teams of both competitions. A total of 30 games played during the 2014 Super Rugby competition and 30 games played during the 2014 Currie Cup were observed. The numbers of most match activities were similar for two competitions, with the average numbers of lineouts, scrums, rucks, tackles and penalties differing by 3% or less between competitions. Statistically and practically significant differences between competitions were for mauls and missed tackles. The average of 6.4 mauls in Super Rugby was significantly lower than the average of 9.6 in the Currie Cup, with a rate ratio of 0.69, implying a difference in the average number of mauls of about 30%. Similarly, the average number of missed tackles was about 20% lower in the Super Rugby competition compared to the Currie Cup. Average numbers of activities were also generally similar for winning and losing teams in the two competitions. Keywords : Levels of competition; Performance indicators; Currie Cup Rugby; Super Rugby

"You're Not Born with Talent" Talented Girls' and Boys' Perceptions of Their Talents as Football Players.

Generally in sports, there is a strong assumption of a connection between skill level in young age and adulthood. Studies have mainly focused on the coaches’ understanding and role in identifying and developing talent. In this article we turn our attention towards the athletes’ perspectives, interviewing talented young football players (five boys and five girls) about their perceptions of their own talent and development. The objective of the article is to investigate how boys and girls perceive their talent and to discuss how various perceptions influence coaching practice in talent development. We introduce the following questions: (a) do the players use a static or dynamic perception of their own talent and (b) do the players consider specific or general skills to be most important in their skill development? Results show that the boys have a more static perception of talent compared to the girls. Furthermore, the boys in this study stress the importance of highly specified skills. The girls have a more balanced view on what is important, but tend to stress the importance of basic skills. The study suggests two potential implications. First, the coaches should be aware of the possible vulnerability following players’ static perception of talent. Second, an exclusive focus on specified skills might make for less optimal preparation for the changing demands young players meet when moving through the different levels of play on their way to high level football. In future research it would be interesting to investigate how players with a lower skill level, not yet regarded as talent, perceive their talent and skill development.

Vertical Jump Performance of Professional Male and Female Volleyball Players

Vertical jump (VJ) performance is an important element for successful volleyball practice. The aims of the study were (a) to explore the overall VJ performance of elite volleyball players of both sexes, (b) to explore the differences in VJ performance among different competition levels and different playing positions, and (c) to evaluate the sex-related differences in the role of the arm swing and 3-step approach with arm swing on the jump height. We assessed the VJ capacity in 253 volleyball players (113 males and 140 females) from Slovenian first and second Volleyball Division. The height of squat jump (SJ), countermovement jump, block jump, and attack jump was tested using an Optojump system. We observed significant differences (p ≤ 0.05) in VJ height between different levels of play that were most pronounced in the SJ. Position-related differences in VJ performance were observed in male players between receivers and setters (p ≤ 0.05), whereas in females, VJ performance across different playing positions seems equal. Finally, we found that male players significantly better use the arm swing during VJ than females (p ≤ 0.05), whereas the use of eccentric part of the jump and approach before the spike to improve VJ performance seem to be equally mastered activity in both sexes. These results could assist coaches in the development of jumping performance in volleyball players. Furthermore, presented normative data for jump heights of elite male and female volleyball players could be useful in selection and profiling of young volleyball players.

Division I Hockey Players Generate More Power Than Division III Players During on- and Off-Ice Performance Tests.

Current research has found anthropometric and physiological characteristics of hockey players that are correlated to performance. These characteristics, however, have never been examined to see whether significant differences exist between on- and off-ice performance markers at different levels of play; Division I, Elite Junior, and Division III. The purpose of this study was to examine the differences that may exist between these characteristics in Division I (24), Elite Junior (10), and Division III hockey (11) players. Forty-five (age: 18-24 years) hockey players completed anthropometric, on-ice, and off-ice tests to ascertain average measures for each division of play. On-ice testing was conducted in full hockey gear and consisted of acceleration, top-speed, and on-ice repeated shift test (RST). Off-ice tests included vertical jump, Wingate, grip strength, and a graded exercise test performed on a skating treadmill to ascertain their (Equation is included in full-text article.). Division I players had significantly lower body fat than their Division III peers (p = 0.004). Division I players also scored significantly better on measures of anaerobic power; vertical jump (p = 0.001), Wingate peak power (p = 0.05), grip strength (p = 0.008), top speed (p = 0.001), and fastest RST course time (p = 0.001) than their Division III counterparts. There was no significant difference between Division I and Elite Junior players for any on- or off-ice performance variable. The results of this study indicate that performance differences between Division I and Division III hockey players seem to be primarily because of the rate of force production.

Incidence and Nature of Medical Attendance Injuries in English Community Rugby Union.

Background:Previous research has identified injury patterns during community-level rugby union match play, but none have investigated the frequency and reasons for on-field injury management.Purpose:To establish the frequency, reasons, and patterns of on-field injury management in English community rugby, including differences between different levels of play.Study Design:Descriptive epidemiology study.Methods:Over 3 seasons, injury information was collected from 46 (2009-2010), 67 (2010-2011), and 76 (2011-2012) English community clubs (Rugby Football Union [RFU] levels 3-9). Club injury management staff reported information for all medical attendances during match play, including details on the injury site and type, playing position (seasons 2010-2011 and 2011-2012 only), and whether the player was removed from play. Clubs were subdivided into groups A (RFU levels 3 and 4 [mainly semiprofessional]; n = 39), B (RFU levels 5 and 6 [mainly amateur]; n = 71), and C (RFU levels 7-9 [social and recreational]; n = 79) to differentiate playing levels.Results:The overall medical attendance incidence was 229 per 1000 player-match hours (95% CI, 226-232), with 45 players removed per 1000 player-match hours (95% CI, 44-46). Attendance incidence for group A (294 per 1000 player-match hours; 95% CI, 287-301) was higher compared with group B (213; 95% CI, 208-218; P < .001) and C (204; 95% CI, 200-209; P < .001). There was a higher incidence of attendances to forwards (254; 95% CI, 249-259) compared with backs (191; 95% CI, 187-196; P < .001). The head was the most common specific site of injury (55 per 1000 player-match hours; 95% CI, 53-57) but the lower limb region overall accounted for most attendances (87; 95% CI, 85-89) and the greatest chance of removal from the pitch (22; 95% CI, 21-23).Conclusion:With the likelihood of 1 injury for each team per match severe enough for the player to leave the pitch and with at least 1 attendance for a head injury per match, there is clear evidence that pitch side staff should be trained to recognize potentially serious injuries.

The Psychological Contract of Volunteer Youth Sport Coaches

This study examined the psychological contract of volunteer youth sport coaches to determine the content, variation, and influences to its development. Interviews were conducted with 22 volunteer coaches of team sports, representing different levels of play (recreational, competitive), coaching tenure (novice, experienced), and gender (female, male), who were sampled to account for the potential variation based on these demographic factors. The findings revealed that volunteer coaches possessed both transactional and relational expectations of themselves and their club. Coaches’ most frequently cited expectations of themselves were technical expertise (transactional), and leadership (relational), while their most frequently cited expectations of the club were fundamental resources and club administration (transactional), and coach support (relational). Variation was found by different levels of play (recreational, competitive) and coaching tenure (novice, experienced). The coaches’ psychological contract was shaped predominately by sources external to the club. Implications for managing the psychological contract of volunteer youth sport coaches and directions for future research are discussed.

Similarities in fan preferences for minor-league baseball across the American Southeast

Three Minor League Baseball leagues across the Southeastern United States are studied in order to determine what drives fan attendance. Individual game attendance and game characteristics are examined for three leagues located in the American southeast, the Florida State League, the Southern League, and the South Atlantic League. Despite the three leagues encompassing different levels of play (from A to AA), the determinants of attendance are similar across leagues. Factors affecting attendance such as winning percentage, weather conditions, local income and population, and individual game promotions, such as fireworks, are explored.

Injuries in Canadian Youth Ice Hockey: The Influence of Relative Age

The purpose of this study was to investigate the relationship between relative age and injury prevalence in Canadian youth ice hockey. In study 1, youth ice hockey-related injuries (among children 10-15 years of age) collected by the Canadian Hospitals Injury Reporting and Prevention Program between 1995 and 2002 were analyzed. The relative ages of injured children were compared across different age groups and injury characteristics (mechanism of injury and severity of injury). In study 2, injuries reported in the Hockey Canada Insurance Database were analyzed. The relative ages of injured children at different levels of play (ie, representative versus house league teams) were compared. In study 1, the majority of injured players were of older relative age. However, relative age was not related to mechanism of injury or severity of injury. In study 2, approximately 40% of injured players at the highest level of play were relatively older, whereas only 20% to 25% of house league injured players were relatively older. Relatively older children within ice hockey age groups are at increased risk of injury compared with their younger peers. Furthermore, the risk of injury for relatively older players is greater at more competitive levels of play. This study proposes that the relative age advantage associated with selection to Canadian youth ice hockey teams is accompanied by an increased risk of injury.

Injuries in rugby union at four different levels of play

Injuries in rugby union at four different levels of play