Sports have been identified as an important contributor to social sustainability, and the benefits for health, well-being, and social learning in young people are well evidenced. Youth elite sports, however, have been criticized as being unsustainable. Following calls for a more socially sustainable development of youth elite sports, research on the topic has increased. However, studies vary in disciplinary origin, concepts, content, and methodology. The aim of this systematic scoping review is to identify and synthesize the current disciplinary research knowledge. Five disciplinary databases were searched. Based on six eligibility criteria and a double-blind review process, a total of 99 articles were selected. Findings were first charted in tables and then examined using descriptive statistics and thematic analysis. Key findings are that there is a lack of conceptual clarity regarding social sustainability, and that the field of study is multidisciplinary with distinct thematic research areas (athlete development, athlete health and well-being, athlete development environment). Most research focuses on athlete-related micro aspects and less on organizational and societal dimensions. Inequity issues were found regarding social diversity, including an overrepresentation of soccer and men's sports. Furthermore, mostly quantitative methodologies are used. A theoretically based and empirically tested understanding of social sustainability is needed as well as research addressing aspects of holistic youth development. Attention should be paid to contextual and macro-level influences. Knowledge about preventive programs and practices that advance social sustainability in youth elite sports is necessary. Organizational conditions and funding programs should be created to increase trans- or multidisciplinary research.

Abstract Background Monitoring elite athletes’ body composition (BC) is vital for health and optimizing performance in sports emphasizing leanness, such as athletics. This study aims to investigate and compare sex- and event-specific off-to in-season BC changes in endurance and power event athletics competitors. Methods Elite male and female endurance athletes (> 800 m runners; n = 21) and power event athletes (sprinters, jumpers; n = 32) underwent dual-energy X-ray absorptiometry (DXA) scans for whole and regional lean mass (LM), fat mass (FM), bone mineral content (BMC), and density (BMD) during off-season (September-October) and in-season (April-May). Linear mixed models tested between-group off-season differences in BC, within-group off-season to in-season changes, and between-group differences in change. To assess meaningful or least significant changes (LSC) in BC, DXA precision errors were determined from two consecutive total body scans in a subsample of athletes (n = 30). Results Male athletes (n = 26) gained significantly (p < 0.05) more body mass (BM; mean difference 1.5 [95% confidence interval (CI):0.5–2.4] kg), LM (843 [95% CI:-253:1459] g), and trunk LM (756 [-502:1156] g) than female athletes (n = 27). The proportion of changes in athlete’s BC exceeding the LSC threshold for LM and trunk LM were 70% and 65% in males, and 48% and 26% in females. Significant (p < 0.05) within-group off-season to in-season increases in LM were found for male endurance and power athletes, and female power athletes. All groups significantly increased BMD (p < 0.05). Only male and female power athletes had significant in- to-off-season increases in BMC. 80% of all athletes who had a meaningful increase in BMC belonged to the power event group. No significant within- or between group change in FM was observed. Conclusions The present study found that male athletes gained more BM, LM and trunk LM than females. Within-group increases in regional and whole-body LM and BMC were predominantly found among power event competitors. Incorporating individual meaningful changes alongside traditional statistics provided additional insights into sex and event-group differences. Future research on elite athletic event groups should include DXA measurements closer to major outdoor-season competitions, coupled with site-specific measures (ultrasound, MRI) for better detection of subtle changes in LM and FM.

RationaleMore research is needed to uncover the effectiveness of combined strength and foam-rolling interventions to prevent running-related injuries. ObjectivesTo evaluate effectiveness of an 18-week general strength and foam-rolling intervention on the incidence of running-related injuries. MethodThis is an 18-week observational comparative study. A total of 433 recreational runners participated (n = 203 female). The intervention group (n = 228) performed general strength and foam-rolling exercises twice weekly for 18 weeks, the control group (n = 205) maintained their regular training habits. Running volume and running-related pain were reported weekly. Secondary analyses were performed on the subgroups of the intervention group based on compliance; low compliance (n = 100), intermediate compliance (n = 63), and high compliance (n = 65). Cumulative incidence proportions were calculated and time-to-event statistics were performed to compare survival times between groups. Univariate cox proportional hazards ratio was calculated to estimate the risk of running-related injuries at 18 weeks. ResultsA total of 100 running-related injuries were sustained. The cumulative incidence proportion for the control and intervention groups was 27.1% (95% CI: 21.4-33.9) and 23.0% (95% CI: 17.8-29.4), respectively. No statistically significant difference was found between the overall intervention group and control group (log-rank p = 0.31). A significant difference existed between the high-compliance subgroup and the control group (log-rank p = 0.00). Highly compliant runners were 85% less likely (hazard rate ratio = 0.15; 95% CI: 0.05-0.46) to sustain an injury during the study compared with controls. ConclusionRecreational runners highly compliant with the intervention were 85% less likely and took on average 57 days longer to sustain a running-related injury when compared with controls, with a cumulative incidence proportion of 4.6% after 18 weeks.

BackgroundTo understand and prevent sport injuries, scholars have employed different scientific approaches and research methods. Traditionally, this research has been monodisciplinary, relying on one subdiscipline of sport science and applying qualitative or quantitative research methods. Recently, scholars have argued that traditional approaches fail to address contextual components of sport and the nonlinear interactions between different aspects in and around the athlete, and, as a way forward, called for alternative approaches to sport injury research. Discussion of alternative approaches are today taking place, however, practical examples that demonstrate what such approaches entails are rare. Therefore, the purpose of this paper is to draw on an interdisciplinary research approach to (1) outline an interdisciplinary case analysis procedure (ICAP); and (2) provide an example for future interdisciplinary sport injury research.MethodsWe adopt an established definition and application of interdisciplinary research to develop and pilot the ICAP for interdisciplinary sport injury teams aiming to integrate qualitative and quantitative sport injury data. The development and piloting of ICAP was possible by drawing on work conducted in the interdisciplinary research project "Injury-free children and adolescents: Towards better practice in Swedish football" (the FIT project).ResultsThe ICAP guides interdisciplinary sport injury teams through three stages: 1. Create a more comprehensive understanding of sport injury aetiology by drawing on existing knowledge from multiple scientific perspectives; 2. Collate analysed qualitative and quantitative sport injury data into a multilevel data catalogue; and 3. Engage in an integrated discussion of the collated data in the interdisciplinary research team.ConclusionThe ICAP is a practical example of how an interdisciplinary team of sport injury scholars can approach the complex problem of sport injury aetiology and work to integrate qualitative and quantitative data through three stages. The ICAP is a step towards overcoming the obstacles of integrating qualitative and quantitative methods and data that scholars have identified.

Aims: We sought to identify self-reported exercise and objectively measured fitness variables associated with glucose tolerance and metabolic health 6-10 years after gestational diabetes (GDM) Methods: Women (n = 84) underwent oral glucose tolerance testing (OGTT), body composition measurements, and lifestyle questionnaires 6 and 10 years after GDM. In a subset (n = 45), peak oxygen uptake (VO2peak), peak fat oxidation, and maximal isometric strength of five muscle groups were tested. Results: At 10 years, 41 women (49%) had impaired glucose metabolism or type 2 diabetes (T2D). VO(2peak )and muscle strength were lowest in the T2D group. In a regression analysis, VO(2peak )and all strength measurements were associated negatively with HbA1c and waist-hip ratio and positively with high-density lipoprotein cholesterol. However, only muscle strength was associated with fasting and area-under-the-curve glucose. For changes between the 6- and 10-year follow-ups, only muscle strength was associated with HbA1c change, whereas both VO(2peak )and strength were associated with high-density lipoprotein level and changes in waist-hip ratio. Peak fat oxidation and self-reported physical activity showed no or weak relationships with glycemic variables. Conclusion: Objectively measured fitness variables, particularly muscle strength, were strongly associated with glycemic and other metabolic outcomes in a high-risk group after GDM.

There is conflicting evidence regarding the health implications of high occupational physical activity (PA). Shoe-based accelerometers could provide a feasible solution for PA measurement in workplace settings. This study aimed to develop calibration models for estimation of energy expenditure (EE) from shoe-based accelerometers, validate the performance in a workplace setting and compare it to the most commonly used accelerometer positions. Models for EE estimation were calibrated in a laboratory setting for the shoe, hip, thigh and wrist worn accelerometers. These models were validated in a free-living workplace setting. Furthermore, additional models were developed from free-living data. All sensor positions performed well in the laboratory setting. When the calibration models derived from laboratory data were validated in free living, the shoe, hip and thigh sensors displayed higher correlation, but lower agreement, with measured EE compared to the wrist sensor. Using free-living data for calibration improved the agreement of the shoe, hip and thigh sensors. This study suggests that the performance of a shoe-based accelerometer is similar to the most commonly used sensor positions with regard to PA measurement. Furthermore, it highlights limitations in using the relationship between accelerometer output and EE from a laboratory setting to estimate EE in a free-living setting.

Background The Oslo Sport Trauma Research Centre Questionnaire on Health Problems (OSTRC-H) has become a popular tool to monitor health status in athletes. Originally developed for adult athletes, the tool is today also being used in adolescent athletes. However, little is known on the suitability of the questionnaire for the adolescent age group and the methodological implications of applying the tool to prospectively monitor illness and injury. To address this gap in methodological knowledge, the aim of this study is to outline and discuss the adaption and application process of the OSTRC-H to adolescent football players. Method The adaption process included a slightly modified back-translation method to translate the questionnaire. The application process included a web-based version of the Swedish OSTRC-H sent out once a week over 23 weeks to 115 adolescent football players aged 10-19 attending two football schools in Sweden. The response rate and prevalence of health problems over 23 weeks were calculated as feasibility indicators. Additionally, comprehensibility questions were added to the questionnaire in the end of the study. Result No major disagreement was found between the original and translated versions of the questionnaire. However, significant changes to the wording of the questions and answer categories were necessary to adapt it to adolescents. A visual body figure was also added. The average weekly response rate was 38% (SD 13.5). To increase this rate, questionnaire data was gathered retrospectively through telephone and email contact with the participants and their parents, elevating the response rate to 53% (SD 15.5). The adolescents experienced the questionnaire as easy to understand and to cover all relevant health problems. Conclusion Our study demonstrates the importance of adapting the questionnaire to the adolescent target group through translation, pre-tests, adjustments of wording and the facilitation of answering the questionnaire using a visual body figure. The study further shows the importance of keeping close and personal contact with the participants, their parents, teachers, and coaches throughout data collection. Future studies should take into account the age group and study context when adapting and applying the OSTRC-H to adolescents.

To prevent sports injuries, researchers have aimed to understand injury aetiology from both the natural and social sciences and through applying different methodologies. This research has produced strong disciplinary knowledge and a number of injury prevention programmes. Yet, the injury rate continues to be high, especially in youth sport and youth football. A key reason for the continued high injury rate is the development of injury prevention programmes based on monodisciplinary knowledge that does not account for the complex nature of sport injury aetiology. The purpose of this paper is to consider and outline an interdisciplinary research process to research the complex nature of sport injury aetiology. To support our proposition, we first present a narrative review of existing youth football and youth sport injury research demonstrating an absence of paradigmatic integration across the research areas' main disciplines of biomedicine, psychology and sociology. We then demonstrate how interdisciplinary research can address the complexity of youth sport injury aetiology. Finally, we introduce the interdisciplinary process we have recently followed in a youth football injury research project. While further research is necessary, particularly regarding the integration of qualitative and quantitative sport injury data, we propose that the pragmatic interdisciplinary research process can be useful for researchers who aim to work across disciplines and paradigms and aim to employ methodological pluralism in their research.

Objectives To investigate (1) the cumulative incidence proportion and the most common anatomical locations of running-related injuries in recreational runners, and (2) the associations between running-related injuries and previous injury, running experience, weekly running distance, age, sex, and body mass index. Design A 1-year prospective cohort study. Methods Two hundred twenty-four recreational runners (average weekly running distance for the past 12 months, 15 km) were included (89 women, 135 men). Pain information was reported weekly for 1 year, and all running-related injuries that resulted in time loss or medical consultation were recorded. We accounted for censoring when calculating cumulative incidence proportion, and used crude Cox proportional hazards regression to evaluate whether the variables of interest were associated with running-related injuries. Results The 1-year cumulative incidence proportion of running-related injuries was 45.9% (95% confidence interval [CI]: 38.4%, 54.2%). The most common anatomical locations were the knee (20/75, 27%) and Achilles tendon/calf (19/75, 25%). Previous injury was associated with a higher injury rate (hazard rate ratio = 1.9; 95% CI: 1.2, 3.2), while the other variables had no statistically significant association with injury. Conclusion There were 75 running-related injuries during the 1-year surveillance period, for a cumulative incidence proportion of 46%. The most common injuries were to the knee and Achilles tendon/calf. Recreational runners with a previous injury were twice as likely to sustain a running-related injury as runners with no previous injury. J Orthop Sports Phys Ther 2021;51(3):144–150. Epub 25 Dec 2020. doi:10.2519/jospt.2021.9673

Most injuries in track and field are caused by overuse with conflicting reports concerning the underlying mechanisms. The purpose of this study was to evaluate how biomechanical and clinical factors relate to the risk of overuse injuries, and to investigate whether the relationships between potential risk factors and injury become stronger if injuries are grouped by location. The study is a prospective cohort study conducted during a Swedish track and field season over eleven months, from October to August. The cohort consisted of elite male and female track and field athletes competing in either middle- and long-distance running, sprinting, jumping, or throwing events (n = 96). Athletes performed a baseline screening at enrollment consisting of a clinical examination, running, and strength tests. Injury data was collected during the season by medical professionals and divided according to their anatomical location into upper-body, thigh/hip, knee, or foot/shank injuries. Thirty-four (54.8%) injuries where located at the foot/shank, followed by sixteen injuries at the thigh/hip (25.8%). Only eight knee (12.9%) and four upper-body (6.5%) injuries were registered during the season and therefore not analysed. Effect sizes were calculated for all test variables. Small effect sizes (rpb = .10–.23) were found for eleven risk factors between the overall injured (all injuries combined) and non-injured athletes. By further sub-grouping the injured group into thigh/hip injuries, effect size increased in hip adduction range of motion knee flexion velocity and the muscle flexibility of the iliopsoas. For foot/shank injuries, only the hamstring:quadriceps strength ratios increased for the right side to a small effect size. Injury grouping appears to increase effect size for certain risk factors. Athletes with a slower knee flexion velocity during stance phase were more likely to become injured (p-value <.03, rpb = .37). An increased cohort size to further sub-divide injuries into specific diagnoses is needed.

Background The purpose of this exploratory study was to investigate whether runners with certain biomechanical or clinical/anthropometrical characteristics sustain more running-related injuries than runners with other biomechanical or clinical/anthropometrical characteristics. Methods The study was designed as a prospective cohort with 52-weeks follow-up. A total of 224 injury-free, recreational runners were recruited from the Gothenburg Half Marathon and tested at baseline. The primary exposure variables were biomechanical and clinical/anthropometrical measures, including strength, lower extremity kinematics, joint range of motion, muscle flexibility, and trigger points. The primary outcome measure was any running-related injury diagnosed by a medical practitioner. Cumulative risk difference was used as measure of association. A shared frailty approach was used with legs as the unit of interest. A total of 448 legs were included in the analyses. Results The cumulative injury incidence proportion for legs was 29.0% (95%CI = 24.0%; 34.8%). A few biomechanical and clinical/anthropometrical factors influence the number of running-related injuries sustained in recreational runners. Runners with a late timing of maximal eversion sustained 20.7% (95%CI = 1.3; 40.0) more injuries, and runners with weak abductors in relation to adductors sustained 17.3% (95%CI = 0.8; 33.7) more injuries, compared with the corresponding reference group. Conclusions More injuries are likely to occur in runners with late timing of maximal eversion or weak hip abductors in relation to hip adductors.

The incidence proportion and severity of overuse injuries (OIs) in elite athletics are still unclear due to methodological limitations of prior studies. The aim was to prospectively measure OI incidence proportion, severity, and anatomic location during a complete Swedish elite athletics season. Seventy-five male and female elite athletes between 18 and 32 years of age, competing in either middle- and long-distance running, sprint, jumping, or throwing events were recruited. A medical professional diagnosed injuries during a physical examination. All injuries were classified as gradual or sudden onset incident injuries due to overuse. An athlete was considered injury free after reporting full return to training in their training documentation. The OI incidence proportion was 72.4% (95% CI: 60.8%, 84%), with 71 recorded injuries. Most injuries were severe, with 38% of them being moderately serious (8-28 days) and 36.6% serious (>28 days-6 months). The most common injury location was the thigh/hip at 41% followed by the foot/shank at 39%. The incidence proportion and severity of OIs were higher when medical professionals evaluated each athlete who developed symptoms, compared to self-reporting athletes. Future research should evaluate possible risk factors for OIs to try to lower the OI incidence proportion.

Background Athletics is a sport with a high incidence of injury, where most injuries are caused by overuse. Research on injury incidence and the occurrence of overuse injuries during a season in athletics is scarce. An athlete availability (unrestricted ability to participate in training or competition) of less than 80% has been linked with athletes being less likely to reach their performance goals. The purpose of this study was to estimate the monthly injury incidence rates, athlete availability, and the overuse injury incidence rate per 1000 athletics-hours of training in a cohort of Swedish elite athletics athletes. Methods The cohort consisted of 59 male and female elite athletes competing in either middle or long-distance running, sprint, or jumping events. Injury and training data were collected during one athletics season, from October to the end of August. All injury data were collected by medical professionals. Training data were collected monthly, and consisted of event-specific training diaries covering training sessions, training days, and non-training or non-competition days. Monthly injury incidence rates were based on the number of new injuries per month in relation to the number of exposed (injury-free) athletes. Results The overall injury incidence rate for all athletes was highest in October (22.0%). Monthly injury incidence rate for middle and long-distance runners was highest in October (26.1%), for sprinters in April (19.0%), and for jumpers in October (21.4%). The overall athlete availability was 78.0% for the cohort. Sprinters had the lowest athlete availability (71.4%), followed by jumpers (77.3%), and middle-distance and long-distance runners (82.7%). Female athletes (76.5%) had a lower athlete availability than male athletes (79.7%). The injury incidence rate was 1.81 injuries per 1000 athletics hours of training. Middle and long-distance runners had the highest injury incidence rate (2.38), followed by jumpers (1.62), and sprinters (1.34). Conclusion Monthly injury incidence rates during a season appears to correspond to periods of high training volume (conditioning phases and training camps). The low overall athlete availability (> 80%) indicates that many Swedish elite athletes are less likely to reach their full potential.

BACKGROUND:High occupational physical activity is associated with lower health. Shoe-based movement sensors can provide an objective measurement of occupational physical activity in a lab setting but the performance of such methods in a free-living environment have not been investigated. The aim of the current study was to investigate the feasibility and accuracy of shoe sensor-based activity classification in an industrial work setting.RESULTS:An initial calibration part was performed with 35 subjects who performed different workplace activities in a structured lab setting while the movement was measured by a shoe-sensor. Three different machine-learning models (random forest (RF), support vector machine and k-nearest neighbour) were trained to classify activities using the collected lab data. In a second validation part, 29 industry workers were followed at work while an observer noted their activities and the movement was captured with a shoe-based movement sensor. The performance of the trained classification models were validated using the free-living workplace data. The RF classifier consistently outperformed the other models with a substantial difference in in the free-living validation. The accuracy of the initial RF classifier was 83% in the lab setting and 43% in the free-living validation. After combining activities that was difficult to discriminate the accuracy increased to 96 and 71% in the lab and free-living setting respectively. In the free-living part, 99% of the collected samples either consisted of stationary activities or walking.CONCLUSIONS:Walking and stationary activities can be classified with high accuracy from a shoe-based movement sensor in a free-living occupational setting. The distribution of activities at the workplace should be considered when validating activity classification models in a free-living setting.

IntroductionIt is assumed that a running-related (overuse) injury occurs when a specific structure of the human body is exposed to a load that exceeds that structures’ load capacity. Therefore, monitoring training load is an important key to understanding the development of a running-related injury. Additionally, other distribution, magnitude and capacity-related factors should be considered when aiming to understand the causal chain of injury development. This paper presents a study protocol for a prospective cohort study that aims to add comprehensive information on the aetiology of running-related injuries and present a new approach for investigating changes in training load with regard to running-related injuries.Methods and analysisThis study focused on recreational runners, that is, runners exposed to a minimum weekly average of 15 km for at least 1 year. Participants will undergo baseline tests consisting of a clinical/anthropometrical examination and biomechanical measurements. Furthermore, participants will log all training sessions in a diary on a weekly basis for 1 year. The primary exposure variable is changes in training load. A medical practitioner will examine runners suffering from running-related pain and, if possible, make a clear diagnosis. Finally, additional time-varying exposure variables will be included in the main analysis, whereas the analysis for the secondary purpose is based on time-fixed baseline-related risk factors.Ethics and disseminationEthical approval (DNR: 712–15) for the study and its design was obtained from the Gothenburg regional ethical review board. The results of the study will be published in peer-reviewed journals.

Safety shoe development is based on static foot measures, which are transferred to last design. However, workplaces are not just static (‘standing workplaces only’). The aim of the present study is to examine static and dynamic foot loading of workers to determine whether foot morphology changes between different loading situations. The results could be used to improve last and shoe design to improve the fit of safety shoes. 1024 workers at different industrial locations in Germany took part in the study. The DynaScan4D dynamic scanner system was used to measure static and dynamic foot morphology during different phases of ground contact. All scan variables were selected based on measures required in the last development process. Cohen’s d (effect size) was calculated to identify individual differences between maximum values during the stance phase of walking and static values in standing. Stepwise multiple linear regression analysis was performed to identify possible influencing variables with regard to differences between static and dynamic values. Several foot measures showed relevant differences between dynamic and static loading. Interestingly, most length, width, height, and angular measures increased during dynamic loading (compared to static loading), whereas all circumference measures decreased. None of the tested variables (age, BMI, gender) predicted the differences between the two loading situations. Most dynamic changes are practical relevant changes between static and dynamic loading. Regarding the fit of safety shoes, it seems appropriate to adapt these changes to the last or shoe design.

BACKGROUND:Overuse injuries (OI) are common in elite athletics. Previous studies have had athletes self-report injuries rather than having a medical professional provide a clear diagnosis. This might be a major reason for the inconsistencies in reported incident proportions of OI in elite athletics, in addition to the varying definitions of OI in current literature. Risk factors or combinations of risk factors (biomechanical, clinical, and training-related) have been shown to be important in the developmental process of OI. However, no studies have examined these relationships using a multifactorial and prospective approach in elite athletics. The purpose of this study protocol is to describe OI incidence proportion, injury severity, location, and occurrence during a complete athletics season. Moreover, possible discipline specific and injury specific risk factors that might be associated with OI will be examined.METHODS:This study will be an explorative prospective cohort study including approximately 120 elite athletes. All athletes will be screened twice during one complete athletics season. The screening will consist of a body composition scan to measure muscle mass, fat free mass, lean mass, bone density, and bone mineral content. In addition, clinical examination will measure range of motion for the lower back, hip, knee, shoulder, and elbow and ankle joints. A running analysis will measure the 3D motions of the hip, knee, and ankle joints. Finally, maximal isometric strength tests of the main core and lower extremity muscles will be carried out. To record injuries, each athlete will consult a physiotherapist or sports medicine doctor affiliated with the study to get a clear diagnosis. Injury data will be recorded according to the previously published athletics consensus statement.DISCUSSION:Results from this study protocol will contribute more insight and detailed knowledge regarding the extent of OI occurrence among elite athletes during a complete athletics season. It will also provide further insights into which risk factors are associated with the development of OI in elite athletics.

This interdisciplinary research project will produce evidence-based recommendations on how injuries in Swedish youth football (soccer) can be prevented. Fewer injuries will positively impact athlete health, performance and career longevity and have the potential to promote life-long physical activity and wellbeing. Injury pattern research demonstrates that injuries are a significant problem in (Swedish) youth sport. Football has a higher traumatic and overuse injury rate than many contact/collision sports (e.g., field hockey, basketball). In research on youth football, the incidence of overuse training injuries was measured as high as 15.4 injuries per 1000 training hours, and the incidence of traumatic and overuse match injuries was 47.5 injuries per 1000 match hours. The injury frequency is alarming and applies to the 54% of children aged 7-14 and the 39% of youths aged 15-19 years who participate in Swedish organised sports. A large body of research identifies injury risk factors and preventative strategies; however, as the recent IOC consensus statement on youth athletic development points out, the existing, mostly bio-medical knowledge does not provide effective evidence-based injury prevention strategies. To address this deficit, interdisciplinary and context-driven knowledge on injury development in youth sport is needed. The proposed project will produce scientific evidence through four consecutive studies: a) Questionnaire to register the types, frequency and management of injuries; b) Laboratory testing of biomechanical, clinical and training-specific parameters to establish individual physical and sport-specific dispositions; c) Observation of sporting contexts to understand sporting cultures, coaching methods and coach-athlete relationships; and d) Interviews with coaches and players to recognize knowledge that shapes coaching and training. The sample of youth players will be recruited from Sweden’s most popular and injury-prone sport: football. Each of the four studies will conduct its own data production and analyses, and a collective analysis will produce integrated evidence. Concrete recommendations for best sporting practice will be developed, which will serve sporting federations, sport education institutions, coaches, sport support staff and players.

"Improvement of fit of security shoes – evaluation of dynamic foot structure." Footwear Science, 9(sup1), pp. S36–S37