264 resultados para Contração miocárdica


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The goal of the present study was to investigate possible differences towards strenght recovery measured by different methods and running economy (RE), after one session of downhill running (DR), in order to induce muscle damage (MD). Our hypothesis is that the strenght recovery measured by jumps is more alike RE markers, due to the measures' specificity. Ten male subjects, ages 18 to 30, apparently healthy, without any experience with strenght training at least 6 months before the tests took place in this study. After going to the lab twice (to familiarize themselves with the protocols, and determine their maximum oxygen consumption/running speeds), they went to the lab five times in the following week, in order to collect all the variables before, immediately after, and 24, 48, 72 and 96 hours in. The variables obtained were: stride frequency (SF), stride lenght (SL), oxygen volume (VO2), carbon dioxide volume (VCO2), ventilation (VE), lactate blood concentration ([Lac]), isometric peak torque (IPT), subjective pain perception (SPP), effort perception (EP), medial-portion circumference (CIR), knee movement extent (EXT), torque development rate (TDR), counter movement jump and squat jump height (HCM and HS), strenght development rate of both jumps (SDCM and SDS), and maximum soil strenght reaction (SRCM and SRS). Changes over time in all variables were verified by one way variancy analysis. Differences between the strenght measures were verified by two way variancy analysis. When significant effects were verified, Tuckey's post-hoc were applied. The significancy level taken on this study was p < 0,05. Of all indirect muscle damage markers, IPT, SPP and TDR were the only ones in which ocurred significant changes. We couldn't find the moments where this happened for TDR with the post-hoc used. On RE markers, VO2, [Lac] and VE suffered significant effects over time. About the jumps variables, only SDCM and HCM presented significant...

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Pós-graduação em Biologia Geral e Aplicada - IBB

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Pós-graduação em Biologia Geral e Aplicada - IBB

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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You can set the resistance training such as making a move against a resistance by performing a muscle contraction and generating a muscular adaptation. This form of training, was initially used only in training athletes aiming to strengthen and improve fitness. Some coaches did not give proper focus, as the increase in muscle mass would cause loss of flexibility and agility. But over time a huge evolution occurred within this area and the practitioners of resistance training are no longer just athletes, and reached the whole community, from young to elderly, being a physical activity that generates a large caloric expenditure and has several health benefits, improve the cardiovascular system and decreasing the amount of body fat in the body. Cortisol is a hormone secreted from a stressful stimulus to the body, secretion undergoes control of the hypothalamic-pituitary axis, which releases the hormone into the bloodstream andrenocorticotrópico, going to the adrenal cortex responsible for their release. This has catabolic function, acting in the metabolism of carbohydrates, proteins and lipids, as well as having an important effect antiflamatório. Testosterone is a steroid hormone cholesterol from being produced by the testicles in men, as in women is produced to a lesser extent in ovary and adrenal glands, has functions androgenic and anabolic. Androgen function is responsible for the development of male sexual characteristics, while on anabolic function operates in the growth of muscles and bones, influencing the development of the human body organs. Within the metabolic changes that occur in the resistance training testosterone plays an important role in protein synthesis, influencing the production of strength and / or power during exercise. The objective of this work is through a literature review to assess the effects of resistance training on the production of these hormones and the relationship between them

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Objetivo: O presente estudo buscou um indicador de classificação de presença de dor lombar baseado no tempo de resistência isométrica e em variáveis eletromiográficas. Material e Métodos: Para tanto participaram do presente estudo 40 voluntários do gênero masculino, os quais foram divididos em dois grupos de 20 voluntários, a saber: grupo sem dor lombar e grupo com dor lombar. Para a captação dos sinais eletromiográficos foram utilizados eletrodos de superfície descartáveis passivos de contato bipolar de Ag/AgCl conectados a um pré-amplificador de ganho de 20 vezes. A distância intereletrodos foi fixa em 20mm. Os eletrodos foram dispostos bilateralmente sobre os músculos longuíssimo do tórax, iliocostal lombar e multífido lombar. Foi utilizado um módulo de aquisição de sinais biológicos de 8 canais no qual foram conectados os eletrodos. Para a aquisição dos sinais foi utilizado um software específico (Aqdados 7-Lynx®) com a freqüência de amostragem calibrada em 2000 Hz. Com os equipamentos preparados e os eletrodos conectados os voluntários realizaram o teste de Sorensen, o qual consiste em sustentar o peso do tronco, em posição horizontal, até a exaustão voluntária. Para a análise dos sinais eletromiográficos foram utilizadas rotinas específicas em ambiente MatLab (MathWorks®). Neste software foi obtida a atividade eletromiográfica dos músculos selecionados durante o teste de contração isométrica até a exaustão para a determinação dos valores de root means quare (RMS) em pacotes de 1s a cada 0.5s (overlap). De cada espectro foram determinados os valores de frequência mediana (FM) e frequência média (Fmed) do sinal. Com a RMS, FM e Fmed foram obtidos também os valores de Razão ML/LT, Razão ML/IL e Razão IL/LT para cada variável. Com isto, os valores de RMS, FM e Fmed, juntamente com os valores de Razão ML/LT, Razão ML/IL e Razão IL/LT de cada variável, foram associados com o tempo...