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- Desempenho anaeróbio em jovens praticantes federados de futebolPublication . Rodrigues Ferreira, Mário André; Noite, João; Fernandes, R.; Fernando, Catarina; Brito, António VencesUm bom desempenho anaeróbio é essencial para o sucesso desportivo no futebol. O objetivo do estudo foi verificar as diferenças entre o desempenho anaeróbio de jovens praticantes federados de futebol (n=10) e de jovens não praticantes federados em nenhuma modalidade desportiva (n=9). Os participantes realizam o teste anaeróbio Wingate, com uma resistência de 75g/kg (7,5% do peso corporal), tendo sido utilizado o cicloergómetro Monark 894E. As variáveis estudadas foram a potência anaeróbia máxima, a potência anaeróbia média e a perda de potência anaeróbia, sendo apresentada em termos absolutos (W) e em termos relativos (W/kg). Para comparação dos grupos em análise utilizámos a técnica estatística t de Student (bicaudal), com o programa SPSS (Statistical Package for Social Sciences) versão 17.0, adotando um nível de significância de p <0,05. Os resultados obtidos revelaram diferenças estatisticamente significativas na potência anaeróbia máxima relativa (9,83 vs. 8,59 W/kg; p =,011) e na potência anaeróbia média relativa (6,99 vs. 5,92 W/kg; p =,021), onde os jovens praticantes federados de futebol obtiveram um desempenho superior. Concluímos que os jovens praticantes federados de futebol apresentam uma maior capacidade para produzir potência anaeróbia máxima e para manter essa potência ao longo dos 30 segundos, provavelmente devido à prática desportiva.- A great anaerobic performance is essential for the sporting success in football. The aim of the study was to analyze the differences in anaerobic performance between young soccer players (n=10) and young non-practicing any sport (n=9). Participants performed the Wingate anaerobic test, with a resistance of 75g/kg (7.5% of body weight), and the ergometer used was the Monark 894E. The variables studied were the peak anaerobic power, average anaerobic power and anaerobic power drop, and it is presented in absolute terms (W) and relative to body weight (W/kg). To compare the groups, the Student’s t test (two-tailed) was used with the SPSS (Statistical Package for Social Sciences) version 17.0, adopting a significance level of p <0.05. The results showed statistically significant differences in relative peak anaerobic power (9.83 vs. 8.59 W/kg, p =.011) and relative mean anaerobic power (6.99 vs. 5.92 W/kg, p =.021), where young football players presented superior performance. We conclude that the young football players have a higher capacity to produce maximum anaerobic power and to maintain that power over the 30 seconds, probably due to sport practice.
- The effects of aging on electromechanical delay: a comparison between karate athletes and non-athletesPublication . Brito, António Vences; Rodrigues Ferreira, Mário André; Branco, Marco A. C.Normal aging in humans is associated with a progressive decline in biological functions that affect motor performance. This study intended to analyze the effects of aging on electromechanical delay during the mae-geri kick performance. Forty-six males were divided into three groups according to age and sports practice: 9 veteran karate practitioners aged between 50 and 63 years (VetK), 21 young karate practitioners (YgK) and 16 non-karate practitioners aged between 18 and 35 years old. Electromechanical delay was defined as the time interval between the onset of the electric activity of a muscle and the beginning of joint movement. The statistical analysis was performed with One-Way Analysis of Variance and Turkey HSD Post-Hoc (SPSS, version 17.0). Rectus femoris EMD was found to be signifi cantly longer in VetK, suggesting that aging has a negative impact on the neuromuscular activity and contractile capacity of this muscle.