Joey C. Eisenmann

Ice hockey in the United Kingdom (UK) spans from grassroots participation to elite and international levels, yet limited data exists on the physical development of youth players. This study aimed to model the development of off-ice, physical performance measures in UK-based male youth ice hockey players, according to both chronological (CA) and biological age (BA). A total of 347 players (mean age 13.7 ± 1.4 years) from U12 to U16 age groups, attending a national showcase event, completed off-ice assessments including anthropometrics, countermovement jump, seated medicine ball throw, 20 m sprint, and pro-agility test. Generalized additive models for location, scale and shape (GAMLSS), with penalized B-splines, were used to the non-linear developmental trajectories between 11 and 16.5 years and derive centile curves for both CA and BA. Results demonstrated a general trend of higher physical performance with increasing CA, while analysis, based on BA, revealed a concentrated period of development between ∼12.5 and 15 years. These findings highlight the non-linear nature of physical development and the importance of accounting for biological maturation in youth athlete assessment. This study provides the first descriptive dataset for competitive UK youth male ice hockey players, offering valuable insights into age and maturity-related performance trends. The reference values support more equitable talent identification and development strategies, aligning with national governing body objectives.

Humans are fascinated by the bipedal locomotor capacities at both ends of the athletic spectrum—sprinting speed and endurance. Some of the more popular field (eg, soccer, rugby, and lacrosse) and court (eg, basketball, tennis, and netball) sports utilize mixed energy systems requiring an interplay of both maximal sprinting speed (MSS) and maximal aerobic speed (MAS) to meet the high-intensity running demands of varying frequency, duration, intensity, and recovery. Recently, these locomotor capacities have been considered in combination to produce what is called the anaerobic speed reserve (ASR) as part of the locomotor profile concept (MSS, MAS, and ASR). The purpose of this narrative review is to (1) provide an overview of the locomotor profile concept; (2) review the assessment methods for estimating MSS, MAS, and ASR; (3) examine the age-, sex-, and maturity-associated variations in MSS, MAS, and ASR; (4) examine the trainability of MSS, MAS, and ASR in youth athletes; and (5) conclude with the practical applications using principles of long-term athlete development for training the locomotor profile in youth field and court sport athletes. Based on the available data in young male athletes, MSS, MAS, and ASR generally increase with age and across maturity groups and are trainable. Overall, decisions on training need to consider the sport demands, current fitness and maturity status, and targeted training adaptation sought.

Sex, chronological age, and maturity potentially impact multidimensional health-related characteristics (i.e. motor competence, physical fitness, psychosocial, physical activity), which adds to the challenges of reversing current youth health-related concerns. Previous research fails to optimally assess such characteristics and consider sex, age, and maturity among youth. Therefore, the aims were to 1) present the multidimensional health-related characteristics of 9-14-year-olds from the UK, 2) examine sex differences, and 3) account for the effect of age and maturity on such characteristics. Eighty-one girls (mean age = 12.8 ± 1.2 years) and 136 boys (mean age = 13.1 ± 1.2 years) were purposively sampled and assessed across each of the four health-related domains. Multiple ANCOVA analyses examined sex differences among characteristics while accounting for chronological age. Pearson's correlations were used to evaluate the associations between maturity and multidimensional health-related characteristics. Multidimensional health-related characteristics were lower than similar populations and highly variable. Boys outperformed girls on most physical measures (ES = -0.76 to 0.76), elicited greater self-determined motivation (ES = 0.36), greater perceived competence (ES = 0.54), and engaged in more vigorous physical activity (ES = 0.78). Small age effects were present across some characteristics (e.g. isometric mid-thigh pull). Associations between maturity and multidimensional health-related characteristics were different for boys and girls (e.g. maturity offset positively associated with motor competence scores in girls only). Results suggest that multidimensional health-related characteristics of 9- to 14-year-olds are a concern, and are impacted by sex, age, and maturity. Identifying methods to improve multidimensional health-related characteristics which considers sex, age, and maturity are required. Assessing multidimensional health-related characteristics across youth is recommended to inform and measure interventions.

Context: Flag football is promoted as a safer alternative to tackle football. This may be 1 reason why participation rates have risen by 39% over the past 3 years. Despite rising participation, epidemiologic research on sport-specific injuries and associated relative risk is lacking.Objective: To prospectively document the epidemiology of injuries in youth flag football.Design: Descriptive epidemiology study.Setting: Regional and national youth flag football tournaments.Patients or Other Participants: Athletes (N = 1939; 1744 boys and 195 girls), ages 6 to 12 years. An athletic trainer prospectively monitored the athletes for sport-related injury and exposures.Main Outcome Measure(s): Athlete risks of injury and injury rates were calculated overall and by sex. Injury characteristics were reported for the total population and by sex.Results: Forty-seven injuries to unique individuals were recorded in 1939 athletes with a total of 9228 athlete-exposures (AEs). The overall risk of injury was 2.4% (95% CI = 1.79%, 3.21%), with an overall injury rate of 5.1 per 1000 AEs (95% CI = 3.75, 6.77). Of the 47 injuries, 36 occurred in boys (8365 AEs), and 11 occurred in girls (863 AEs). A higher risk in girls was evidenced by both the injury risk ratio (2.73; 95% CI = 1.41, 5.30) and injury rate ratio of 2.96 (95% CI = 1.51, 5.82). The most common injury sites were the head/face/neck (n = 15, 31.9%), followed by the ankle/foot (n = 9, 19.1%). The most frequent types of injury were contusion (55.3%), sprain/subluxation (14.9%), and general trauma (10.6%); 74.5% of all injuries resulted from direct impact.Conclusions: Although the competition injury rate for youth flag football was lower than the values from studies reporting comparable tackle football data, the frequencies by body part, type, and mechanism were similar. Given that most injuries were related to some form of impact and predominantly contusions, adopting minimal protective equipment or padding may reduce the numbers of these injuries.

Background: Motor competence is an integral component of the health and performance of youth. Numerous studies support the hypothesis that motor competence interacts with perceived motor competence and physical fitness during childhood to induce positive (e.g. healthy weight status) or negative (e.g. reduced physical activity engagement) trajectories. Yet, while adolescence is a key period of rapid growth and maturation, no systematic reviews and meta-analyses have examined the association between motor competence and physical activity, physical fitness and psychosocial characteristics solely within adolescents.Objectives: This study aimed to (1) analyse the scientific literature evaluating associations between motor competence and physical activity, physical fitness and/or psychosocial characteristics amongst adolescents; (2) evaluate the associations between motor competence and physical activity, physical fitness characteristics and/or psychosocial characteristics amongst adolescents; and (3) investigate the impact of moderator variables (i.e., age, sex, type of motor competence assessment) on the associations.Methods: A systematic search of electronic databases was conducted, followed by a qualitative synthesis of study methods. Random-effects meta-analyses were performed to establish the magnitude and orientation of pooled correlation coefficients between motor competence and physical activity, physical fitness and psychosocial characteristics of adolescents, whilst considering potential moderators (i.e., age, sex, type of motor competence assessment).Results: Sixty-one studies were included, totalling 22,256 adolescents. Twenty-seven different assessments of motor competence were used, with 31 studies utilising product-orientated (i.e. outcome) motor competence assessments. Meta-analyses of 43 studies showed that motor competence was positively associated with physical activity (r = 0.20 to 0.26), some physical fitness characteristics (e.g. muscular strength, cardiovascular endurance;r = 0.03 to 0.60) and psychosocial characteristics (r = 0.07 to 0.34), and inversely associated with weight status (r = − 0.36 to − 0.10), speed (r = − 0.31) and agility (r = − 0.37 to 0.41). Associations with flexibility were unclear.Conclusions: The results of this systematic review and meta-analysis support the hypothesised interactions of motor competence with physical activity (positive), physical fitness (positive except for weight status, speed and agility) and psychosocial characteristics (positive) in adolescence. However, methodological approaches vary considerably (e.g. variety of motor competence assessments utilised), with limitations of the current literature including an inadequate assessment of motor competence, a lack of longitudinal observations and a failure to account for biological maturation. Future research assessing associations between motor competence and physical activity, physical fitness and psychosocial characteristics of adolescents should include longitudinal observations of a combined motor competence assessment (i.e. process and product) and account for biological maturation. Improved evaluation using these recommendations could provide more accurate data, leading to more targeted interventions to improve adolescents’ physical and psychosocial outcomes.Clinical Trial Registration: CRD42021233441 (PROSPERO ID).

Youths play sports for fun, to develop skills and for the psychosocial benefits associated with sports participation. Long-term athletic development is a concept that can support these aims within youth sports and develop happy and healthy young individuals. However, to successfully implement a long-term athletic development strategy, it is important to understand principles of paediatric exercise science including growth and maturation, how to develop athleticism (and reduce injury occurrence), enhance psychosocial skills and characteristics, and balance training loads. Focused on rugby, this chapter aims to (1) summarise the key research related to long-term athletic development, (2) present and discuss the practical application of the ten pillars of long-term athletic development proposed by the National Strength and Conditioning Association and (3) show how these principles can be delivered through a coaching session framework. Such information will help governing bodies, organisations and practitioners reflect and develop their practices for implementing long-term athletic development for all young rugby players.

In 2015, the Society of Health and Physical Educators of America (SHAPE America) launched 50 Million Strong^TM with goals of improving physical literacy, increasing physical activity levels, and encouraging lifelong physical activity among children by the year 2029. Not only are youth sports programs crucial to meeting 50 Million Strong^TM goals, but it also requires the purposeful efforts of sport coaches, program administrators, researchers, coach educators, and coach developers. While it is encouraging that research on sport coaching topics appears to be growing, there is still much to learn about how to prepare coaches to provide quality sport experiences for their athletes. Consequently, to further this call, it is crucial to understand the current state of sports coaching research and propose future research needs in the discipline. The purpose of this paper is to identify research needs in sports coaching and coach education/development that assists in achieving the 50 Million Strong^TM goals of SHAPE America. Throughout the paper, critical research questions are identified in two main areas: 1) coaches’ roles in developing physically literate athletes, and 2) developing coaches in regards to coach learning, the efficacy of coach education, and coach health and well-being. Furthermore, commensurate with other papers in the series commissioned by the SHAPE America Research Consortium, we discuss these areas within a social ecological model to understand the impact of the bi-directional interactions between environmental factors and individual behaviors.

We designed grip strength standards for youth by back-extrapolating cutpoints based on weakness at age 65. Existing standards, based on insufficient bone mineral content (BMC), were also compared in a nationally representative sample. Altogether, 6837 participants (n = 2199 ≤ 18.9 years of age) from the National Health and Nutrition Examination Survey had dominant hand, grip strength assessed. Lambda Mu Sigma regression was used to create percentiles of strength and identify thresholds linked with clinically relevant weakness (CRW) in older adults. Approximately 93% and 75% of young people met standards based on CRW and BMC, respectively. Non-Hispanic white and black youth were more likely to meet grip strength cutpoints. Underweight children were less likely (odds ratios = 0.20 to 0.26), while overweight/obese youth were more likely (1.38 to 2.71), to meet strength standards compared to normal weight. The standards can be used with, or in place of, normative standards when evaluating grip strength.

Motor competency is integral to the long-term athletic development of youths. Strength and conditioning (S&C) coaches are recommended to deliver motor competency interventions, yet no studies have investigated their perceptions and practices for developing motor competency in youths. Sixty-seven male, and 4 female S&C coaches completed an initial and follow up questionnaire using a 5-point Likert scale, rating 1] the importance of developing competence, and 2] how frequently they developed competence across 90 motor competencies. Over 55% of S&C coaches reported a broad range of “important” (69/90) and ”frequently developed” (48/90) motor competencies. The most important motor competency was “deceleration” (4.9 ± 0.3), whilst “hip hinge (bilateral)” was the most practised (4.4 ± 0.5). S&C coaches targeted upper body pushing and pulling competencies more than their perceived importance, whilst agility (e.g., turning) competencies were targeted less than their importance. Further analysis showed S&C coaches who delivered 3–4 sessions per week targeted 15–18% more competencies compared to ≤ 2 sessions per week. Overall, these findings have strong implications for youth motor competency development including the reflection of important vs. practised competencies, coach education programmes, and consideration for how S&C coaches should seek to optimise motor competency development within youths.

As highlighted in this special issue, physical activity during childhood and adolescence is influenced by several factors including body size and composition, biological maturity, and motor skill d...