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Contributions to Safety in Aquatic Environment

Mon, 01 Jan 2018 00:00:00 GMT

Título: Contributions to Safety in Aquatic Environment Autor(es): Abraldes, José Arturo; Fernandes, Ricardo; Lima, Antônio Barroso Tipo: Artigo de Periódico

Moderate intensity and volume downhill run does not impair knee joint stability at early and late phases of quadriceps/hamstrings contraction

Wed, 01 Jan 2014 00:00:00 GMT

Título: Moderate intensity and volume downhill run does not impair knee joint stability at early and late phases of quadriceps/hamstrings contraction Autor(es): Assumpção, Cláudio de Oliveira; Lima, Leonardo Coelho Rabello de; Oliveira, Felipe Bruno Dias de; Greco, Camila Coelho; Denadai, Benedito Sérgio Abstract: BACKGROUND AND OBJECTIVE: Muscle strength imbalance can be an important factor in hamstrings muscle strain. The main purpose of this study was to investigate the effects of downhill running on hamstrings/quadriceps torque (H/Qtorque) and the electromechanical delay (H/QEMD) ratios. METHODS: Fifteen active male individuals performed two maximal voluntary isometric contractions of the knee extensors and knee flexors, from which the maximal muscle torque, EMD and H/Qtorque and H/QEMD ratios were extracted. Thereafter, the participants performed a 30-minute downhill run (−16%) at 70% VO2max. Dependent variables were assessed immediately before, immediately following and 48 hours after the effort. RESULTS: Maximal isometric torque decreased significantly immediately after the downhill run for both the extensors (pre: 271.8 ± 45.9 N·m; post: 235.5 ± 55.7 N·m) and flexors (pre: 112.2 ± 26.3 N·m; post: 97.7 ± 27.2 N·m). No significant difference was identified over time for the EMD of the vastus lateralis and biceps femoris muscles. The H/Qtorque and H/QEMD ratios were not influenced by the downhill run. CONCLUSION: We have demonstrated that moderate intensity and volume downhill run does not impair knee joint stability at early (H/QEMD) and late phases (H/Qtorque) of quadriceps/hamstrings contraction. Tipo: Artigo de Periódico

A relação com o saber e a corporeidade em movimento: aproximações com o comportamento inteligente na educação física escolar

Tue, 01 Jan 2019 00:00:00 GMT

Título: A relação com o saber e a corporeidade em movimento: aproximações com o comportamento inteligente na educação física escolar Autor(es): Venâncio, Luciana; Sanches Neto, Luiz Abstract: In this article, we are using the theme “body and movement”, considering that the relationship with knowledge in school physical education occurs in a time that it is pedagogically necessary and it is unique to each individual. When the student moves, he or she allows himself or herself to understand some concepts with the body, to learn to recognize that knowledge is in the body in motion and to explain that learning is to use the body in different situations. Our goal is to bring the theme of “body and movement” closer to the notion of relation to knowledge of the intelligent behavior. We explored the intricacies of human complexity, from the concept of Sich-Bewegen, as the proper movement of each individual who acts and thinks in a dialogical way with the world, leading to the emergence of autonomous, creative and intelligent behaviors, which are being transformed as the world imposes obstacles on them. We consider that, in this sense, the speech of each individual will be considered as an instrument of reflexivity. Tipo: Artigo de Periódico

Neuromuscular Responses to Simulated Brazilian Jiu-Jitsu Fights

Wed, 01 Jan 2014 00:00:00 GMT

Título: Neuromuscular Responses to Simulated Brazilian Jiu-Jitsu Fights Autor(es): Silva, Bruno Victor Corrêa da; Ide, Bernardo Neme; Simim, Mário Antônio de Moura; Marocolo, Moacir; Mota, Gustavo Ribeiro da Abstract: The aim of this study was to investigate the neuromuscular performance responses following successive Brazilian Jiu-Jitsu (BJJ) fights. Twenty-three BJJ athletes (age: 26.3 ± 6.3 years; body mass: 79.4 ± 9.7 kg; body height: 1.80 ± 0.1 m) undertook 3 simulated BJJ fights (10 min duration each separated by 15 min of rest). Neuromuscular performance was measured by the bench press throw (BPT) and vertical counter movement jump (VCMJ) tests, assessed before the 1st fight (Pre) and after the last one (Post). Blood lactate (LA) was measured at Pre, 1 min Post, and 15 min Post fights. Paired t-tests were employed in order to compare the BPT and VCMJ results. One-way ANOVA with Bonferroni post hoc tests were utilized to compare LA responses. The results revealed a significant (p < 0.05) increase in VCMJ performance (40.8 ± 5.5 cm Pre vs. 42.0 ± 5.8 cm Post), but no significant changes in the BPT (814 ± 167 W Pre vs. 835 ± 213 W Post) were observed. LA concentration increased significantly (p < 0.05) at Post, both in the 1st min (10.4 ± 2.7 mmol L-1) and the 15th min (6.4 ± 2.5 mmol L-1) of recovery. We concluded that successive simulated BJJ fights demanded considerable anaerobic contribution of ATP supply, reinforcing the high-intensity intermittent nature of the sport. Nevertheless, no negative impact on acute neuromuscular performance (power) was observed. Tipo: Artigo de Periódico