BackgroundAmong combat sports, Judo and Brazilian Jiu-Jitsu (BJJ) present elevated physical fitness demands from the high-intensity intermittent efforts. However, information regarding how metabolic and neuromuscular physical fitness is associated with technical-tactical performance in Judo and BJJ fights is not available. This study aimed to relate indicators of physical fitness with combat performance variables in Judo and BJJ.MethodsThe sample consisted of Judo (n = 16) and BJJ (n = 24) male athletes. At the first meeting, the physical tests were applied and, in the second, simulated fights were performed for later notational analysis.ResultsThe main findings indicate: (i) high reproducibility of the proposed instrument and protocol used for notational analysis in a mobile device; (ii) differences in the technical-tactical and time-motion patterns between modalities; (iii) performance-related variables are different in Judo and BJJ; and (iv) regression models based on metabolic fitness variables may account for up to 53% of the variances in technical-tactical and/or time-motion variables in Judo and up to 31% in BJJ, whereas neuromuscular fitness models can reach values up to 44 and 73% of prediction in Judo and BJJ, respectively. When all components are combined, they can explain up to 90% of high intensity actions in Judo.DiscussionIn conclusion, performance prediction models in simulated combat indicate that anaerobic, aerobic and neuromuscular fitness variables contribute to explain time-motion variables associated with high intensity and technical-tactical variables in Judo and BJJ fights.

Dehydration is a common event associated with exercise. However, few studies have examined the effects of dehydration on plasma redox status in humans. Eighty-two athletes were recruited and had Baseline anthropometrics and blood samples obtained. Athletes then engaged in a dehydration protocol, training until 3% of pre-weight body mass was lost. Athletes returned to the lab and had Post-dehydration blood collected. Athletes then consumed an isotonic drink until pre-exercise body weight was reestablished. Blood was then recollected (1-h post-full rehydration (PFR)). Samples were centrifuged and the plasma snap frozen in liquid nitrogen and stored at -80°C. Lipid and protein oxidative stress was determined by measuring F 2 -isoprostanes and protein carbonyls (PC), respectively. Antioxidant capacity was determined by the ferric reducing ability of plasma (FRAP) and trolox equivalent antioxidant capacity (TEAC) assays. Plasma osmolality was determined using an osmometer. Statistical analysis utilized a 1-way ANOVA with post-hoc testing. Values are reported as mean ± SD. Plasma osmolality was significantly elevated immediately post-dehydration (p≤0.001) but decreased to Baseline at PFR.Plasma TEAC increased immediately post-dehydration and at PFR (p<0.001). FRAP increased immediately post-dehydration (p<0.001) and decreased to below Baseline at PFR (p<0.05).Conversely, F 2 -isoprostanes declined significantly from Baseline to immediately postdehydration and then significantly rose at PFR (p≤0.001), while PC declined at PFR (p<0.01).This study indicates that dehydration and exercise cause a significant increase in plasma osmolality and antioxidant potential immediately post-exercise. We propose dehydration significantly elevates antioxidant concentration which suppresses F 2 -isoprostanes and PC.

Background: Among combat sports, Judo and Brazilian Jiu-Jitsu (BJJ) present elevated physical fitness demands from the high-intensity intermittent efforts. However, information regarding how metabolic and neuromuscular physical fitness is associated with technical-tactical performance in Judo and BJJ fights is not available. This study aimed to relate indicators of physical fitness with combat performance variables in Judo and BJJ. Methods: The sample consisted of Judo (n = 16) and BJJ (n = 24) male athletes. At the first meeting, the physical tests were applied and, in the second, simulated fights were performed for later notational analysis. Results: The main findings indicate: i) high reproducibility of the proposed instrument and protocol used for notational analysis in a mobile device; ii) differences in the technical-tactical and time-motion patterns between modalities; iii) performance-related variables are different in Judo and BJJ; and iv) regression models based on metabolic fitness variables may account for up to 53% of the variances in technical-tactical and/or time-motion variables in Judo and up to 31% in BJJ, whereas neuromuscular fitness models can reach values up to 44 and 73% of prediction in Judo and BJJ, respectively. When all components are combined, they can explain up to 90% of high intensity actions in Judo. Discussion: In conclusion, performance prediction models in simulated combat indicate that anaerobic, aerobic and neuromuscular fitness variables contribute to explain time-motion variables associated with high intensity and technical-tactical variables in Judo and BJJ fights.

Introdução: Atualmente, vem crescendo a utilização de diferentes métodos de treinamento de força (TF) como drop-set e bi-set, com intuito de maximizar gasto energético (GE). Porém, não há evidências que comprovem este fato. Objetivos: Mensurar e comparar o gasto energético (GE) em sessões de TF empregando os métodos drop-set, bi-set e TF tradicional (TRAD). Métodos: Nove homens recreacionalmente ativos realizaram três protocolos de exercícios em dias distintos, separados por intervalos de uma semana. O drop-set e o TRAD seguiram ordem fixa de execução dos exercícios; o bi-set foi realizado com dois exercícios sem intervalo entre eles. Todos os protocolos foram desempenhados a 80% de 1RM e, durante as sessões de treinamento, foi mensurado o consumo de oxigênio (VO2) e o GE. Resultados: Os resultados indicam que, durante a sessão de treino, o método drop-set gerou maiores valores de VO2 (13,6 ± 6,8 > 11,2 ± 5,9 kg/ml/min), GE (5,2 ± 2,3 > 4,5 ± 2,3 kcal/min-1), frequência cardíaca (128 ± 27,1 > 113 ± 22,4 bpm-1) e razão de trocas gasosas (1,2 ± 0,2 > 1,1 ± 0,1) quando comparado ao bi-set e TRAD (p<0,05). Conclusão: Maiores valores de frequência cardíaca durante o treino e gasto calórico superior foram observados no TF realizado com o método drop-set em relação ao bi-set e TRAD.

RESUMOObjetivo: comparar a força dos músculos flexores do punho entre graduações de atletas de Jiu-Jitsu brasileiro, previamente e imediatamente após combate, em competição oficial. Método: para medida da força dos músculos flexores do punho foi utilizado dinamômetro. A medida foi expressa em Kg e comparada entre faixas etárias e graduações. Foram realizadas duas medidas de preensão manual com cada atleta, uma anteriormente o primeiro combate e a segunda medida imediatamente após a luta. Resultados: verificou-se redução da força de preensão manual, expressa em média de Kg, após o combate, entre atletas das três categorias de idade, 18 a 23 anos (p = 0,02), 24 a 29 anos (p = 0,03) e 30 anos ou mais (p = 0,01). Porém, entre as categorias de idade não se observou diferença na média de força de preensão pré luta (p = 0,31) e preensão pós luta (p = 0,22). Comparado aos atletas faixas branca, os faixas azul obtiveram redução de força, em média de 6,16 Kg. No entanto, a maior variação foi observada entre os atletas faixa roxa (11,7 Kg). Considerações finais: verificou-se importante diferença na força de preensão manual antes e imediatamente após combate de atletas de Jiu-Jitsu brasileiro, graduados nas faixas azul e roxa, independente da faixa etária.