INTRODUÇÃO: A lesão do ligamento cruzado anterior (LCA) é considerada uma lesão grave e pode afetar a carreira de um jogador de futebol profissional. O tratamento cirúrgico é frequentemente necessário para o tratamento da instabilidade. Embora a reconstrução do LCA seja considerada um procedimento eficaz em restaurar a estabilidade articular, a literatura mostra que apenas 55% dos atletas retornam à prática de esportes competitivos após a cirurgia. Jogadores de futebol profissional dependem de habilidades técnicas, táticas e físicas, como boa função do joelho e capacidade aeróbia. O objetivo deste trabalho é avaliar a capacidade aeróbia em jogadores profissionais de futebol de campo com lesão do LCA e após seis meses de reabilitação pós-operatória. MÉTODOS: Vinte jogadores profissionais de futebol de campo com lesão do LCA foram submetidos a reconstrução do LCA com tendões flexores autólogos e foram comparados com 20 jogadores profissionais de futebol de campo em atividade, sem histórico de lesão no joelho. Avaliamos a capacidade aeróbia máxima pelo consumo máximo de oxigênio (VO2max) e submáxima pelos limiares ventilatórios (LV1 e LV2), avaliados por ergoespirometria em esteira utilizando o protocolo de Heck modificado. Os testes foram realizados no pré-operatório e aos seis meses de pós-operatório e os resultados comparados ao grupo controle de jogadores profissionais em plena atividade. Também realizamos questionários de função subjetiva do joelho (Lysholm e IKDC), dinamometria isocinética computadorizada e avaliação da composição corporal por bioimpedância. RESULTADOS: No grupo com lesão do LCA a média da idade foi de 21,7 anos, enquanto no grupo controle foi de 22,1 anos (p=0,99). O intervalo de tempo a lesão e a cirurgia foi, em média, cinco meses. No pré-operatório, o VO2max, em mL/kg/min, foi em média ? desvio padrão de 45,2 +- 4,3, aos seis meses de pós-operatório 48,9 +- 3,8 (p < 0,001) e no grupo controle 56,9 +- 4,2 (p < 0,001 comparado ao pré-operatório e pós-operatório). A porcentagem de gordura corporal, em média +- desvio padrão, no pré-operatório foi de 14,7+- 3,7, no pós-operatório 14,9 +- 5,4 e no grupo controle 12,8 +- 4, sem diferença estatisticamente significativa entre os grupos. Os resultados do questionário Lysholm no pré-operatório, pós-operatório e no grupo controle foram, em média, 77,25, 94,12 e 97,5 (p < 0,05 em todas as comparações) e do questionário IKDC subjetivo foram 59,46, 87,75 e 97,28 (p < 0,001 em todas as comparações). O déficit de pico de torque de extensão do joelho a 60 O/s, foi de 21,5% no pré-operatório, 15,7% no pós-operatório (p=0,63) e 3,1% no grupo controle (p < 0,001 com relação ao pré-operatório e pós-operatório). CONCLUSÃO: Os jogadores profissionais de futebol de campo avaliados seis meses após a reconstrução do LCA apresentaram VO2max significativamente inferior aos resultados do grupo controle, embora os resultados pós-operatórios tenham sido significativamente superiores aos observados no pré-operatório. Houve uma melhora significativa nos scores de função do joelho no pós-operatório com relação ao pré-operatório e a composição corporal dos indivíduos não apresentou diferenças estatisticamente significativas / INTRODUCTION: Anterior cruciate ligament (ACL) injury is a severe injury and may impact a professional football player\'s career. Surgical treatment is often indicated due to knee instability. Although ACL reconstruction (ACLR) is considered a successful procedure in restoring knee stability in athletes, it has been shown that only 55% return to competitive sports after surgery. Professional football players need technical, tactical and physical skills to succeed, including adequate knee function and aerobic capacity. Our purpose is to evaluate aerobic capacity in professional football players with ACL injury and six months after ACL reconstruction. METHODS: Twenty professional football players underwent ACL reconstruction with autologous hamstring grafts and were compared to 20 active, uninjured professional football players. We assessed maximal aerobic capacity with maximal oxygen consumption (VO2max) and submaximal with ventilatory thresholds, measured by ergoespirometric test performed in a treadmill with a modified Heck protocol. The tests were performed pre-operatively and six months after ACLR, and compared to the control group. We also performed knee function questionnaires (Lysholm and IKDC), isokinetic strength test and body composition evaluation with electric bioimpedance. RESULTS: ACL group average age was 21.7 y.o., and control group 22.1 y.o.(p=.99). Time span between injury and surgery was 5 months, in average. Pre-operative VO2max was 45.2 +- 4.3 mL/kg/min, post-operative was 48.9 +- 3.8 (p > .001) and control group was 56.9 +- 4.2 (p < 001 in both comparisons). Pre-op body fat percentage was 14.7+-3.7, post-op was 14.9 +- 5.4 and control 12.8 +- 4 (n.s.). Lysholm questionnaire results were 77.25, 94.12, and 97.5 (pre-op, post-op and control, respectively, p <. 05 in all comparisons). IKDC results were 59.46, 87.75 and 97.28 (pre-op, post-op and control, respectively, p < .001 in all comparisons). Preop peak torque isokinetic knee extension deficit at 60°/s was 21.5%, postop 15.7% (p=.63) and control 3.1% (p <. 001). CONCLUSION: Professional football players had significantly lower VO2max six months after ACLR compared to controls, although their results were significantly higher than observed pre-operatively. There was a significant improvement in knee function scores after ACLR. Body composition evaluation was not significant different among the groups evaluated

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Syfte Syftet med detta arbete var att ur före detta tävlings-fäktares perspektiv undersöka orsakerna bakom de omfattande avhopp som sker i övergången mellan ungdoms- och seniorklass i svensk fäktning, samt vad föreningar och förbund kunnat göra för att motverka dessa avhopp. Studien syftar även till att undersöka vilka åtgärder föreningar och förbund kan göra för att främja återupptagandet av tävlande enligt före detta tävlings-fäktare. Vilka orsaker ser före detta värj-fäktande ungdomar till varför de slutade tävla? Vilka åtgärder kunde föreningar och förbund vidtagit enligt före detta värjfäktare för att förhindra deras avhopp ifrån tävlande som ungdomar? Vilka åtgärder kan enligt före detta värjfäktare föreningar och förbund vidta för att främja återupptagande av tävlande? Metod Studiens teoretiska utgångspunkt är motivationsteorin self-determination theory (SDT) och är genomförd med en kvalitativ ansats. Sex semistrukturerade intervjuer har genomförts med före detta fäktare. Intervjuerna har analyserats med tematisk innehållsanalys. Resultat Respondenterna upplevde ett kompetensbekräftande genom tävlandet samt en stark känsla av tillhörighet och när dessa faktorer försvann eller minskade i omfattning ledde det till avhopp. Vidare framkom att avhoppen hade kunnat förhindrats. Därutöver framkom att fäktarna kan ställa sig positiva till att återuppta tävlandet som motionärer ifall det skulle finnas en attraktiv breddverksamhet vad gäller både tävlingar och träningar. I ett återupptagande av tävlandet hade det sociala sammanhanget varit högt prioriterat men också möjligheten att få mäta sig mot fäktare på liknande nivå som de själva i anpassade tävlingsformer. Slutsats Det fanns ett starkt samband mellan avhoppen och att de psykologiska behoven upphörde att uppfyllas av deltagande i sporten. Svensk fäktning kunde under ungdomsåren starkt uppfylla behoven kopplade till att känna samhörighet och kompetens och även i viss mån autonomi men misslyckades med att tillgodogöra de grundläggande psykologiska behoven när fäktarna blev äldre. Vidare visar detta vikten av att föreningar och förbund arbetar aktivt med att tillgodose de grundläggande psykologiska behoven för motivation ifall avhoppen ska minskas och för att främja till återupptagandet av tävlande. / Aim The aim of this study was to investigate, from the perspective of former competitive fencers, the reasons behind the high level of drop outs that occur in the transition between youth and senior levels in Sweden, as well as what clubs and federations could have done to counteract these drop outs. The study also aimed to investigate what measures clubs and federations can take to promote the resumption of competing according to former competitive fencers. - What reasons do former épée fencing youths give as why they stopped competing? - According to former épée fencers, what measures could clubs and federations have taken to prevent youth drop out? - According to former épée fencers, what measures can clubs and federations take to promote the resumption of competing? Method The study's theoretical framework was the self-determination theory (SDT) and the research body was qualitative. Six semi-structured interviews have been conducted with former fencers. The interviews have been analyzed using thematic content analysis. Results The results showed that the former fencers had experienced a confirmation of competence through competitions, as well as a strong sense of belonging to their teammates and friends in the sport. When these factors disappeared or decreased, it led to drop outs. It also emerged that these drop outs could have been prevented. In addition, it emerged that the fencers are positive about resuming competition recreationally if there is an wide range of activities in terms of both competitions and training targeted at recreational fencers. For the resumption of competing, social context has been identified as a high priority. Another high priority is the opportunity to compete against fencers of a similar level to themselves in adapted forms of competition. Conclusions There was a strong correlation between the drop out of youth fencers and their psychological needs not being fulfilled in the sport. During childhood of the respondents, participation in fencing strongly fulfilled the need for a sense of belonging and feeling of competence, and to a certain extent autonomy. Fencing in Sweden however failed to provide this as the fencers got older. Furthermore, if drop outs are to be reduced and the competing is to be resumed, the study demonstrates the importance of clubs and confederations working actively to meet the psychological needs of the athletes.