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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Respostas neuromusculares, metabolicas e percepção de esforço durante exercicios intermitentes de alta intensidade / Metabolic and neuromuscular responses and rate of perceived exertion during high-intensity intermittent exercise

Okano, Alexandre Hideki 29 February 2008 (has links)
Orientador: Antonio Carlos de Moraes / Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Educação Fisica / Made available in DSpace on 2018-08-11T02:55:02Z (GMT). No. of bitstreams: 1 Okano_AlexandreHideki_D.pdf: 920056 bytes, checksum: e16cc719a684f3e7e9a4132585472631 (MD5) Previous issue date: 2008 / Resumo: O propósito do presente estudo foi verificar o efeito de diferentes tempos de esforço:pausa (E:P) no exercício intermitente de alta intensidade sobre as respostas neuromusculares, o lactato sangüíneo (LACS) e a percepção subjetiva de esforço (PSE). Doze ciclistas, do sexo masculino, foram submetidos a três protocolos de esforços intermitentes de alta intensidade. Os protocolos de exercício intermitente longo (EIL = 4 x 30 s, com intervalo de dois minutos entre cada teste), exercício intermitente médio (EIM = 8 x 15 s, com um minuto de intervalo) e exercício intermitente curto (EIC = 16 x 7,5 s, com intervalo de 30 s entre os testes) foram realizados aleatoriamente, com intervalo de 48 horas entre cada protocolo. Os índices de decréscimo da potência de pico e do trabalho foram mais elevados (P<0,05) nos protocolos de EIL (12 e 15%) e EIM (11 e 13%) quando comparado ao EIC (4 e 7%), respectivamente. O trabalho total realizado nos protocolos EIM (70143 J) e EIC (67071) foram superiores (P<0,05) em relação ao EIL (62011). Houve redução (P<0,05) da amplitude dos sinais eletromiográficos (EMG-RMS) com o decorrer dos esforços nos protocolos de EIL e EIM, porém, sem alterações no EIC. Com relação à freqüência mediana, houve redução somente no protocolo de EIL. O LACS e a PSE foram superiores nos EIL e EIM quando comparados ao protocolo de EIC. De acordo com os resultados podemos concluir que os protocolos EIL e EIM acarretam em maiores níveis de fadiga neuromuscular, LACS e PSE / Abstract:The purpose of this study was to evaluate the effects of different work: rest time relation during high-intensity intermittent exercise on the neuromuscular responses, blood lactate levels (LAC) and rate of perceived exertion (RPE). Twelve male cyclists performed three protocols of high intensity intermittent exercise. The protocols of long intermittent exercise tests (IEL = 4 x 30 s, with two minutes rest between each test), medium intermittent exercise (IEM = 8 x 15 s, with one minute rest between the tests) and short intermittent exercise (IES = 16 x 7,5 s, with 30 s rest between tests) were conducted randomly, separated by 48 hours. The rates of decline in peak power and total work were higher (P<0,05) on the protocols IEL (12 and 15%) and IEM (11 and 13%) when compare to IES (4 and 7%), respectively. The total work done during protocols IEM (70143 J) and IES (67071 J) were higher (P<0,05) when compare to IEL (62011J). There was a reduction (P<0,05) in electromyography activity (root-mean-square RMS) during the protocols of IEL and IEM, however, no significant changes in IES were found. Considering the median frequency from the electromyography signals, there was only significant reduction in IEL. The LAC and RPE were higher in IEL and IEM when compared to IES. According to the results is possible to conclude that the IEL and IEM protocols cause higher neuromuscular fatigue, LAC and RPE / Doutorado / Ciencia do Desporto / Doutor em Educação Física

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