Science & medicine in football最新文献

This audit assessed the representation of elite female footballers in performance and injury research and evaluated the consideration of ovarian hormones within this research. A standardised audit of performance and injury research in elite football was conducted, systematically reviewing studies to quantify the inclusion of elite female players and the consideration of ovarian hormone profiles. A total of 722 studies were included. Female-only research has increased in recent years, with 47% (n = 44) of all female-only studies published since 2022. However, male-only studies dominate, comprising 83% (n = 600) of all studies. Female-only studies accounted for 13% of all research, with women representing 7% of all participants. Only one study investigated injury characteristics and recovery in exclusively female players. Of the 104 studies including female players, 96% did not provide sufficient information to define menstrual status. Only four studies offered enough detail to be evaluated using the tiering system by Smith etal. (2022b): 2.5 were ranked ungraded (menstrual status defined but with insufficient methodological control), 1.5 ranked bronze tier (some methodological control). No study was classified as gold tier, which indicates best practice. Our findings show elite female footballers remain significantly underrepresented, particularly in studies examining injury characteristics and recovery, with minimal consideration of ovarian hormones. To advance the field and improve methodological quality, future research must use robust objective measures (e.g. ovulation testing or progesterone monitoring) to determine ovarian hormone profiles and ensure sex-balanced representation across all research themes to accelerate the development of the women's game.

The objective was to examine the prevalence, incidence rate, and burden of health problems among top-level female football players in Finland. During the four-season follow-up, altogether 372 players (mean age 20.6 years) from 13 teams participated. Players reported all health problems (sudden-onset injuries, gradual-onset injuries and illnesses) weekly using a mobile application. Training exposure was collected at the team level from coaches and individual match exposure from the match statistics. Prevalence, incidence rate, and burden of injuries and illnesses were calculated. The average weekly response rate was 87%. The weekly prevalence of any health problem was 23.1% (95% CI 21.0-25.3%). Prevalence of health problems causing moderate or severe modifications in sports participation/performance (substantial health problems) was 15.8% (95% CI 14.2-17.7%). Altogether 783 injuries (5.5 injuries per 1000 hours) and 586 illnesses (1.7 cases per 365 player-days) were reported. Seventy percent of injuries were sudden-onset (3.7 per 1000 hours) and 30% gradual-onset injuries (1.6 per 1000 hours). The incidence rate of sudden-onset injuries per 1000 hours was 2.3 (1.9-2.7) in training and 15.3 (11.2-21.0) in match play. Sudden-onset injuries accounted for 54% of total time loss, gradual-onset injuries 17%, and illnesses 30%. Thigh (19%) and ankle (18%) injuries were most common. Knee injuries, particularly ACL injuries, were the most severe, with knee injuries causing 53% and ACL injuries 28% of all injury time loss. Sudden-onset injuries, occurring mainly in matches, posed the greatest health burden for female football players.

There is a lack of epidemiological research on knee injuries and Anterior Cruciate Ligament (ACL) tears among National Collegiate Athletic Association (NCAA) soccer athletes. To describe the epidemiology of knee injuries and ACL tears in NCAA soccer. We analyzed data captured within the NCAA Injury Surveillance Program during 2009/10-2018/19. We examined injury frequencies and rates by event type, division, and sex, and knee injury distributions by injury diagnosis, mechanism, history, playing position, and activity at the time of injury. We used injury rate ratios (IRRs) to assess differences in injury rates and injury proportion ratios (IPRs) to assess the differential distribution of injuries across explanatory variables of interest. Random effects Poisson regressions were used to identify factors associated with recovery. Knee injury and ACL tear rates generally centered around comparable values across the study period. Overall knee injury (IRR = 1.38; 95%CI=[1.24, 1.53]) and ACL tear (IRR = 3.10; 95%CI=[2.20, 4.35]) rates were higher in women's soccer, as compared with men's soccer. Competition-related knee injury rates were higher than practice rates in both groups. Knee injuries in men's (36.7%) and women's (38.7%) soccer were most often classified as sprains, and most commonly attributed to blocking/defending activities (Men's soccer: 15.4%; Women's soccer: 15.5%). Findings indicate a higher rate of knee injuries and ACL tears in competitions than in practices. Coupled with the results observed in women's soccer, these findings suggest that the risk of knee injuries and ACL tears in competitions and in women's soccer merit attention.

Advancements in recent years have enabled the generation of tracking data from broadcast videos. However, regardless of the quality of these systems, off-screen actions cannot be monitored since the athletes are not visible. The present study investigates the influence of player visibility in soccer broadcast videos on typical data analysis routines in soccer. To this end, we emulate broadcast player tracking data from two video sources (scouting feed, SF; broadcast television, TV) and compare the quality of physical and tactical performance metrics to the official player tracking data (GT) in two experiments. Experiment 1 analyzes the impact of player visibility on total distance and high-speed distance covered, while experiment 2 investigates its effect on tactical formation detection through template matching. The results show that overall 97% but less than 50% of player activity is visible in SF and TV, respectively. Experiment 1 indicates that visibility in SF and TV significantly affects the assessment of physical match intensity. Experiment 2 shows that SF visibility has no meaningful effect on formation recognition accuracy, while limited visibility in TV results in minor accuracy reductions. The findings suggest that while some tactical analysis can be reliably conducted using broadcast tracking data, physical metrics may be more susceptible to inaccuracies caused by missing data. Although data quality may be improved through interpolation of missing player trajectories, researchers and practitioners rely on transparency from data providers regarding their methods to assess the sufficiency of their data to the task at hand.

Understanding the most common injuries in beach soccer and their risk factors is essential for ensuring player safety. We aimed to describe the injury patterns and identify factors associated with the risk of injury in men's beach soccer. We prospectively recorded injuries reported by players at an on-site aid station during the Japanese National Beach Soccer Championships between 2013 and 2023 (9 tournaments). Match exposure was recorded through video review. We described the injury types and sites, and the factors associated with the injury risk using generalized estimating equations in negative binomial models adjusted for confounders. In total, 796 participants played for 1360.5 player-hours. We observed 144 injuries, with an incidence rate of 106.0/1000 player-hours (95% CI: 89.9-125.0), representing 153 diagnoses. The most frequent injury sites were as follows: foot (n = 40), thigh (n = 24), and lower leg (n = 21). The most frequent injury type was contusion (n = 75). Of the 83 injuries caused by a contact with another player, 24 resulted in a foul. There were 35 injuries associated with time loss (incidence rate 25.7/1000 player-hours, 95% CI: 18.6-35.7), mainly in the foot (n=10) and the thigh (n=8). The risk of injury was lower for goalkeepers and higher in players with time-loss injuries in the past year, with trends towards higher risk for players with lower BMI and history of severe injuries. Lower limb contusions are the predominant injuries in men's beach soccer. Our findings raise the question of protective foot gear to reduce foot contusions and fractures and can inform playing schedules of players at risk.

The objective of this study was to investigate the barriers experienced by elite women football players due to their menstrual cycle, and coping strategies utilised against these barriers. Fifteen elite women footballers from two English Women's Super League clubs (age: 25.2 years [18-33]) were interviewed using semi-structured interviews, developed using piloting and peer review. Data was audio recorded, transcribed verbatim and analysed thematically using NVivo. Analysis of 27,438 words unveiled key themes: internal barriers, external barriers, coping strategies, and player needs. Fear of leakage, associated with kit colour (n = 15) and lack of effective sanitary products (n = 12), and injury anxiety (n = 7), associated with ACL injury (n = 5), were the most common barriers. To combat these issues, players use internal (feeling fortunate n = 9) and external (support from teammates n = 6; support from club staff n = 4) coping strategies. The findings indicated that menstruation presents significant barriers to players. Increased awareness of menstruation-related barriers to performance and targeted intervention are achievable through staff and player involvement and by minimising concerns of visible leakage by kit interventions.

This study aimed to benchmark and analyze match performance of elite soccer players from various confederations during the FIFA World Cup Qatar 2022 (Men's WC) and FIFA Women's World Cup Australia and New Zealand 2023 (Women's WC). A total of 128 matches were analyzed using an optical tracking system (n = 1,351 player observations). Players from various national teams were categorized into their respective confederations: Europe (UEFA), South America (CONMEBOL), North/Central America and Caribbean (CONCACAF), Africa (CAF) and Asia and Oceania (AFC/OFC). Generalized Linear Mixed Models and Linear Mixed Models were employed to assess performance differences between confederations. Data revealed that CONMEBOL players in the Men's WC covered less total distance than UEFA players (p = 0.0396; ES = 0.6). However, no differences were found in high-intensity running and sprinting distances across confederations in both tournaments. UEFA players in both competitions typically demonstrated superior technical/tactical performances. In particular, UEFA players in the Women's World Cup made more passes, had 7-16% higher pass completion rates and achieved 10-15% greater line break completion rates compared to those from CAF, CONCACAF and AFC/OFC (p < 0.0001 to p = 0.0199, ES = 0.5-1.3). These findings suggest that UEFA players may possess a tactical/technical edge in international competitions. However, caution should be exercised when interpreting data due to high variations within confederations. This is the first comprehensive study describing match performance between confederations during the Men's and Women's WC, providing valuable insights into the physical and technical/tactical aspects of elite soccer.

This study investigates the evolution of passing networks (PN) at both team and player levels in the FIFA World Cups (WC) from 2010 to 2022. Analyzing 256 matches (7328 player observations) using a multiple-camera tracking system across four WCs, we considered six playing positions: goalkeeper (n = 521), central defender (n = 1192), fullback (n = 1223), midfielder (n = 2039), winger (n = 1320), and central forward (n = 1033). We used 17 network metrics and considered contextual variables such as team formation, and team ranking. Linear mixed-effect models analyzed differences in team and player PN parameters by year and team strength. Results showed a shift from possession-play to direct-play from the 2010 to 2018 WCs, with possession-play returning in 2022. Specifically, high- and low-quality teams significantly decreased their density, average degree (AD), modularity, and average path length in 2018 (p < 0.05). High-quality teams showed increased density, AD, and average weighted degree in 2022 (p < 0.05). Midfielders and central forwards exhibited significantly lower centrality parameters, whereas central defenders and goalkeepers showed increased centrality parameters (p < 0.05). This study highlights the evolutionary trends of passing relationships from a network analysis perspective over twelve years, providing insights into the changing dynamics of team interactions and positional prominence in elite soccer.