Efeitos de diferentes intensidades de exercício resistido sobre a modulação autonômica da frequência cardíaca e metabolismo láctico de diabéticos tipo 2
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Data
2018-02-22
Autores
Cruz, Angélica Cristiane da [UNESP]
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Universidade Estadual Paulista (Unesp)
Resumo
Introdução: Durante o exercício físico, os ramos simpático e parassimpático, por meio dos mecanismos centrais e periféricos, interagem entre si causando ajustes nas respostas da frequência cardíaca (FC) de acordo com a carga, os quais podem estar alterados na presença de Diabetes Melitus tipo 2. Essas alterações também podem ocorrer durante o momento de recuperação pós exercício resistido. Objetivo: Investigar os ajustes autonômicos cardíacos durante exercício físico resistido dinâmico com diferentes níveis de estresse metabólico, abaixo e acima do limiar de anaerobiose. Material e método: A amostra foi composta por 14 indivíduos diabéticose 10 indivíduos aparentemente saudáveis, de ambos os sexos com idade a partir 40 anos. Na condição de repouso a frequência cardíaca (FC) e os intervalos R-R (iR-R) foram analisados no domínio do tempo, da frequência e pelo plot de Poincaré. O limiar de anaerobiose (LA) foi determinado durante o exercício de extensão de joelho (mesa romana) e aplicado dois testes: um com 10% abaixo e outro com 10% acima do LA, com duração de um minuto cada um, mantendo respiração espontânea e sem apneia. A FC e os iRR foram registrados continuamente durante 65s de repouso, durante a contração isotônica e 5 minutos de recuperação. A partir desses dados serão estudados os ajustes da FC e da sua variabilidade durante o esforço e também no período de recuperação. Resultados e conclusão: Os resultados do nosso estudo mostraram que houve alterações mais significativas do lactato mensurado pelo sangue a partir de 30% de 1RM para o GC bem como para o grupo DM2, este último com alterações mais expressivas quando comparado também com as cargas de 40 e 50% de 1RM. Quanto a VFC foi observado uma redução significativa em relação ao repouso nos índices RMSSD e SD1 do CG e nenhuma alteração significativa no grupo DM2, apresentando em ambos os grupos uma tendência de estabilização após 30% de 1RM e não sendo possível encontrar o LA, determinado pela VFC, nessa população em especifico submetida a um protocolo incremental de exercício resistido de membros inferiores.
Introduction: During exercise, the branchs sympathetic and parasympathetic, central and peripheral mechanisms interact inducing adjustments on of heart rate (HR) responses according to the intensity, which can be changed in the presence of type 2 diabetes mellitus. Those changes may occur during the time after resistance exercise recovery. Objective: To investigate cardiac autonomic adjustments during dynamic exercise with different levels of metabolic stress, below and above the anaerobic threshold, and in the recovery period in diabetics patients. Methods: The sample consisted by 14 diabetcs subjects and 10 apparently healthyof both sexes aged starting 40 years old. At rest HR and R-R intervals (R-Ri) wereanalyzed in the time and frequency domain and the Poincaré plot. The anaerobic threshold (AT) was determined during the performance of knee extension exercise in the Roman table and was applied two tests: one with 10 % below and the other 10 % above the AT, during one minute, keeping spontaneous breathing and no apnea. The HR and R-Riwere recorded continuously for 65 seconds at rest, during isotonic contraction and 5 minutes of recovery. From these data, were studied the adjustments of HR,their variability during exercise and also during the recovery period. Results and conclusion: The results of our study show that you have more than 30% of 1RM for the GC as well as for the DM2 group, the latter containing more expressive when compared also with as 40 and 50% loads of 1RM. What is a HRV was observed a significant reduction in relation to the rest in the RMSSD and SD1 indices of CG and soon without a GM2 group, showing in both groups a tendency of stabilization after 30% of 1RM and not being possible to find the LA, determined by HRV, in this specific population submitted to an incremental protocol of resisted lower limb exercise.
Introduction: During exercise, the branchs sympathetic and parasympathetic, central and peripheral mechanisms interact inducing adjustments on of heart rate (HR) responses according to the intensity, which can be changed in the presence of type 2 diabetes mellitus. Those changes may occur during the time after resistance exercise recovery. Objective: To investigate cardiac autonomic adjustments during dynamic exercise with different levels of metabolic stress, below and above the anaerobic threshold, and in the recovery period in diabetics patients. Methods: The sample consisted by 14 diabetcs subjects and 10 apparently healthyof both sexes aged starting 40 years old. At rest HR and R-R intervals (R-Ri) wereanalyzed in the time and frequency domain and the Poincaré plot. The anaerobic threshold (AT) was determined during the performance of knee extension exercise in the Roman table and was applied two tests: one with 10 % below and the other 10 % above the AT, during one minute, keeping spontaneous breathing and no apnea. The HR and R-Riwere recorded continuously for 65 seconds at rest, during isotonic contraction and 5 minutes of recovery. From these data, were studied the adjustments of HR,their variability during exercise and also during the recovery period. Results and conclusion: The results of our study show that you have more than 30% of 1RM for the GC as well as for the DM2 group, the latter containing more expressive when compared also with as 40 and 50% loads of 1RM. What is a HRV was observed a significant reduction in relation to the rest in the RMSSD and SD1 indices of CG and soon without a GM2 group, showing in both groups a tendency of stabilization after 30% of 1RM and not being possible to find the LA, determined by HRV, in this specific population submitted to an incremental protocol of resisted lower limb exercise.
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Palavras-chave
Sistema nervoso autônomo, Variabilidade da frequência cardíaca, Diabetes mellitus tipo 2, Limiar anaeróbio, Exercício resistido, Autonomic modulation, Heart rate variability, Diabetes mellitus type 2, Anaerobic threshold, Resistance exercise