Background: A high injury-incidence in the world of youth team sports requires athletes, teams and healthcare to invest big amounts of money and time. There is a need to find implementable time- and cost-effective strategies that can highlight youth athletes at increased risk of sustaining injuries, to inform the physiotherapist’s/coach’s training plan for training load adjustments. Aim: The primary aim of this report is to investigate whether the rebound jump test (RJ) can be used to detect neuromuscular fatigue, to try minimize the risk of sustaining injuries in youth team sports. The secondary aim is to investigate how the reactive strength index (RSI) in the RJ correlate with the drop jump test (DJ), to try establish concurrent validity of the RJ. Method: In total, 46 male youth soccer players (17,1 ± 1,2 years old) were recruited. RJ were performed in a non-fatigued state and in a fatigued state after a hard football session, whilst the DJ was performed in a non-fatigued state only. Results: RSI-RJ was strongly correlated with the RSI-DJ (r=0,83, r²= 0,69, p<0,01) and there was a significant -12 % difference between RSI-fresh and RJ-fatigue in the RJ (p<0,01). Conclusion: RJ is a valid test to measure neuromuscular fatigue and could inform the physiotherapist/coach about each athletes’ readiness to train on a weekly basis.

Föreliggande studie har genomförts i samarbete med en kommun i Sverige. Syftet medstudien har varit att, inom ett ungdomsteam, undersöka teammedlemmars upplevelse av hurarbetet i team inverkar på förekomsten av arbetsrelaterad stress. Teamet innefattarsocialsekreterare, familjebehandlare och ungdomscoacher som tillsammans utreder, avhjälpersamt förebygger kriminalitet och normbrytande beteenden bland ungdomar i kommunen.Med hjälp av krav-, kontroll- och stödmodellen undersöks teammedlemarnas upplevelse avhur arbetet i team inverkar förekomsten av arbetsrelaterad stress. Sex av teammedlemarnadeltog i kvalitativa semistrukturerade intervjuer som sedan analyserades enligt the constantcomparative method. Av intervjuerna kunde sju centrala teman identifieras: yrkeskompetens,arbetsbelastning, tydlighet i arbetsuppgifter och yrkesroll, stöd från kollegor och stöd frånledning. Resultatet visar på variation i upplevelsen av den arbetsrelaterade stressen i teamet.Det framkommer ett antal faktorer som påverkar upplevelsen. Faktorer som kunde varabidragande till arbetsrelaterad negativ stress var höga kvalitativa och kvantitativa krav.Faktorer som minskade den negativa stressen var stödet från kollegor, kollektiv kontroll inomoch över arbetet samt egenkontroll inom arbetet. Det framkommer även att teamets samarbeteutvecklats över tid. Den kollektiva kontrollen har utvecklats, vilket skapat bättre möjligheteratt hantera kvantitativa och kvalitativa krav. Stödet som medlemmarna utvecklat till varandrahar fungerat som en buffert som vidare stärkt kontrollen. Således tolkas den arbetsrelateradestressen ha minskat genom teamarbetet. / This study has been done in collaboration with a Swedish county. The purpose of the studyhas been to investigate, within a youth team, team members' experience of how working inteams affects the occurrence of work-related stress.The team includes social workers, familytherapists and youth coaches who together investigate, remedies and prevent crime andnon-normative behavior among young people in the county. Using the demand-, control- andsupportmodel, the team member’s experience of working as a team and their work-relatedstress is investigated. Six of the team members participated in qualitative semi-structuredinterviews which were then analyzed with the constant comparative method. Seven centralthemes could be identified from the interviews: professional competence, workload, clarity intasks and the professional role, support from colleagues and support from management. Theresult of the study shows variation in the teams experience of job-related stress. There are anumber of factors that influence the experience. Factors that could be contributing tojob-related negative stress were high qualitative and quantitative demands. Factors thatreduced the negative stress were support from colleagues, collective control within and overthe job and self-control within the job. It also appears that the team's collaboration hasdeveloped over time. The collective control has been developed, which has created betteropportunities to handle quantitative and qualitative requirements. The support that themembers have developed for each other has worked as a buffer that further strengthenedcontrol. Thus, the job-related stress is interpreted to have decreased through teamwork.