BackgroundYouth sport participation offers many benefits including the development of self-esteem, peer socialisation and general fitness. However, an emphasis on competitive success, often driven by goals of elite-level travel team selection, collegiate scholarships, Olympic and National team membership and even professional contracts, has seemingly become widespread. This has resulted in an increased pressure to begin high-intensity training at young ages. Such an excessive focus on early intensive training and competition at young ages rather than skill development can lead to overuse injury and burnout. PurposeTo provide a systematic, evidenced-based review that will (1) assist clinicians in recognising young athletes at risk for overuse injuries and burnout; (2) delineate the risk factors and injuries that are unique to the skeletally immature young athlete; (3) describe specific high-risk overuse injuries that present management challenges and/or can lead to long-term health consequences; (4) summarise the risk factors and symptoms associated with burnout in young athletes; (5)provide recommendations on overuse injury prevention. MethodologyMedical Subject Headings (MeSHs) and text words were searched on 26 March 2012 from MEDLINE, CINAHL and PsycINFO. The search yielded 953 unique articles. Additional articles were found using cross-referencing. The process was repeated on 10 July 2013 to review any new articles since the original search. Screening by the authors yielded a total of 208 relevant sources that were used for this article. Recommendations were classified using the Strength of Recommendation Taxonomy (SORT) grading system. Definition of overuse injuryOveruse injuries occur due to repetitive submaximal loading of the musculoskeletal system when rest is not adequate to allow for structural adaptation to take place. Injury can involve the muscletendon unit, bone, bursa, neurovascular structures and the physis. Overuse injuries unique to young athletes include apophyseal injuries and physeal stress injuries. EpidemiologyIt is estimated that 27 million US youth between 6 and 18 years of age participate in team sports. The National Council of Youth Sports survey found that 60 million children aged 6-18 years participate in some form of organised athletics, with 44 million participating in more than one sport. There is very little research specifically on the incidence and prevalence of overuse injuries in children and adolescents. Overall estimates of overuse injuries versus acute injuries range from 45.9% to 54%. The prevalence of overuse injury varies by the specific sport, ranging from 37% (skiing and handball) to 68% (running). Overuse injuries are underestimated in the literature because most of the epidemiological studies define injury as requiring a time loss from participation. Risk factorsPrior injury is a strong predictor of future overuse injury. Overuse injuries may be more likely to occur during the adolescent growth spurt. The physes, apophyses and articular surfaces in skeletally immat...

Sudden cardiac death (SCD) is the leading cause of death in athletes during sport. Whether obtained for screening or diagnostic purposes, an ECG increases the ability to detect underlying cardiovascular conditions that may increase the risk for SCD. In most countries, there is a shortage of physician expertise in the interpretation of an athlete's ECG. A critical need exists for physician education in modern ECG interpretation that distinguishes normal physiological adaptations in athletes from abnormal findings suggestive of pathology. On 13-14 February 2012, an international group of experts in sports cardiology and sports medicine convened in Seattle, Washington, to define contemporary standards for ECG interpretation in athletes. The objective of the meeting was to develop a comprehensive training resource to help physicians distinguish normal ECG alterations in athletes from abnormal ECG findings that require additional evaluation for conditions associated with SCD.

IMPORTANCE The major North American professional sports leagues were among the first to return to full-scale sport activity during the coronavirus disease 2019 (COVID-19) pandemic. Given the unknown incidence of adverse cardiac sequelae after COVID-19 infection in athletes, these leagues implemented a conservative return-to-play (RTP) cardiac testing program aligned with American College of Cardiology recommendations for all athletes testing positive for COVID-19. OBJECTIVE To assess the prevalence of detectable inflammatory heart disease in professional athletes with prior COVID-19 infection, using current RTP screening recommendations. DESIGN, SETTING, AND PARTICIPANTS This cross-sectional study reviewed RTP cardiac testing performed between May and October 2020 on professional athletes who had tested positive for COVID-19. The professional sports leagues (Major League Soccer, Major League Baseball, National Hockey League, National Football League, and the men's and women's National Basketball Association) implemented mandatory cardiac screening requirements for all players who had tested positive for COVID-19 prior to resumption of team-organized sports activities. EXPOSURES Troponin testing, electrocardiography (ECG), and resting echocardiography were performed after a positive COVID-19 test result. Interleague, deidentified cardiac data were pooled for collective analysis. Those with abnormal screening test results were referred for additional testing, including cardiac magnetic resonance imaging and/or stress echocardiography. MAIN OUTCOMES AND MEASURES The prevalence of abnormal RTP test results potentially representing COVID-19-associated cardiac injury, and results and outcomes of additional testing generated by the initial screening process. RESULTS The study included 789 professional athletes (mean [SD] age, 25 [3] years; 777 men [98.5%]). A total of 460 athletes (58.3%) had prior symptomatic COVID-19 illness, and 329 (41.7%) were asymptomatic or paucisymptomatic (minimally symptomatic). Testing was performed a mean (SD) of 19 (17) days (range, 3-156 days) after a positive test result. Abnormal screening results were identified in 30 athletes (3.8%; troponin, 6 athletes [0.8%]; ECG, 10 athletes [1.3%]; echocardiography, 20 athletes [2.5%]), necessitating additional testing; 5 athletes (0.6%) ultimately had cardiac magnetic resonance imaging findings suggesting inflammatory heart disease (myocarditis, 3; pericarditis, 2) that resulted in restriction from play. No adverse cardiac events occurred in athletes who underwent cardiac screening and resumed professional sport participation. CONCLUSIONS AND RELEVANCE This study provides large-scale data assessing the prevalence of relevant COVID-19-associated cardiac pathology with implementation of current RTP screening recommendations. While long-term follow-up is ongoing, few cases of inflammatory heart disease have been detected, and a safe return to professional sports activity has thus far been achieved.

A systematic review of the literature on the frequency and characteristics of sports related growth plate injuries affecting children and youth in organised sport was carried out. Both acute and chronic physeal injuries related to participation in sports have been reported to occur, although injury incidence data are somewhat limited. Of particular concern is the growing number of stress related physeal injuries, including those affecting the lower extremities. Although most physeal injuries appeared to resolve with treatment and rest, there is also evidence of growth disturbance and deformity. Possible injury risk factors and countermeasures are discussed, and suggestions for directing future research provided.