The effect of football basic technical training using unilateral leg on bilateral leg transfer in male children / Efeito do treinamento de habilidades básicas do futebol usando transferência unilateral e bilateral de pernas em meninos

ABSTRACT This experiment investigted transfer of skills from dominant leg limb to non-dominant leg limb and vice versa in dribbling with the ball, juggling and passing/shooting technics of soccer for inexperienced male children. 24 male student age of 10 years from 3th grade who have not involved in a football club as a player. In football basic technical practices, dominant leg (DL) group just used their dominand leg/foot, and non-dominant leg (NDL) group just used their non-dominant leg/foot. Practice phase applied one time a week between February and May on the football field with synthetic grass. The results showed there were not exist no significant difference between the transfers from dominant leg group to non-dominant group or vice versa. On the other hands, performance of all technics improved on dominant and non-dominant groups for the comparison of pre- and post-tests. The findings suggest that the transfer of learning skills could be more effective from non-dominant leg limb to dominant leg limb significantly for technics of juggling, dribbling and kicking.

RESUMO Este experimento investigou a transferência de habilidades do membro dominante da perna para o membro não dominante e vice-versa no drible com a bola, controle de bola e nas técnicas de passe/chute do futebol para meninos iniciantes. Participaram do estudo 24 estudantes de 10 anos de idade da terceira série que não tinham participado de nenhum clube de futebol como jogador. Nas práticas das técnicas básicas do futebol o grupo de perna dominante (PD) apenas usou a perna/pé dominante e o grupo de pernan não dominante (PND) apenas usou a perna não dominante. A fase de prática foi aplicada uma vez por semana entre fevereiro e maio no campo de futebol com grama sintética. Os resultados mostraram que não houve diferença significativa entre as transferências do grupo dominante das pernas para o grupo de pernas não dominantes e vice-versa. Por outro lado, o desempenho de todas as técnicas melhorou no grupo de pernas dominantes e não dominantes na comparação de pré-teste para o pós-teste. As descobertas sugerem que a transferência de habilidades de aprendizado poderia ser mais eficaz do membro não dominante para o membro dominante nas técnicas de controle de bola, drible e chute.

Comparative Study of Posterior Lumbar Interbody Fusion via Unilateral and Bilateral Approaches in Patients with Unilateral Leg Symptoms

OBJECTIVE: We investigated the clinical and radiological advantages of unilateral laminectomy in posterior lumbar interbody fusion (PLIF) procedure comparing with bilateral laminectomy, under the same procedural condition including bilateral instrumentation and insertion of two cages, in patients with degenerative lumbar disease with unilateral leg symptoms. METHODS: We retrospectively reviewed 124 consecutive cases of PLIF via unilateral or bilateral approach between January 2006 and April 2010. In 80 cases (bilateral group), two cages were inserted via bilateral laminectomy, and in 44 cases (unilateral group), via unilateral laminectomy. The average follow-up duration was 29.5 months. The clinical outcomes were evaluated with the Visual Analogue Scale (VAS) and the Oswestry disability index (ODI). The fusion rates and disc space heights were determined by dynamic standing radiographs and/or computed tomography. Operative times, intra-operative and post-operative blood losses and hospitalization periods were also evaluated. RESULTS: In clinical evaluation, the VAS and ODI scores showed excellent outcomes in both groups. There were no significant differences in term of fusion rate, but the perioperative blood loss and the operative time of the unilateral group were lower than that of the bilateral group. CONCLUSION: Unilateral laminectomy can minimize the operative time and perioperative blood loss in PLIF procedure. However, the different preoperative disc height between two groups is a limitation of this study. Despite this limitation, solid fusion and satisfactory symptomatic improvement could be achieved uniquely by our surgical method. This surgical method can be an alternative surgical technique in patients with unilateral leg pain.

Cross Training Effect Following Unilateral Leg Strengthening Exercise

OBJECTIVE: To examine the effects of unilateral leg exercise on the contralateral leg and the cross training effect according to the training intensity. METHOD: Nineteen healthy males volunteered to be subjects for this investigation and were divided into a training group (N=13) and a control group (N=6). One leg of each subject in the training group was randomly assigned to a six week, three day/week isokinetic strengthening training program for concentric knee extension-flexion performed at 60 degrees/second (group A, N=6) and 180 degrees/second (group B, N=7). The control group did not train for six weeks. The strength of the knee extensor and flexor was tested before and after the six week period training by Cybex 770 dynamometer. RESULTS: In both groups A and B, the training resulted in significant increase of knee extensor strength in trained limb compared to control group. However, the strength increment of untrained limb was not significant compared to control group. CONCLUSION: There was no significant cross training effect following unilateral leg strength exercise.