Modulação autonômica da frequência cardíaca na recuperação após exercício aeróbio submáximo em diferentes valores de pressão arterial e frequência cardíaca de repouso
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Data
2018-03-02
Autores
Oliveira, Letícia Santana de [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
Introdução: A pressão arterial (PA) e a frequência cardíaca (FC) de repouso são importantes parâmetros cardiovasculares que fornecem informações relevantes na recuperação do exercício. Não está claro na literatura, se normotensos e indivíduos fisicamente ativos com diferentes valores de FC de repouso podem apresentar diferentes respostas na recuperação do exercício. Objetivo: Analisar a recuperação após exercício aeróbio submáximo em indivíduos saudáveis fisicamente ativos com diferentes valores de PA e diferentes FC de repouso. Métodos: O estudo foi realizado com 47 jovens saudáveis do sexo masculino com idade entre 18 e 30 anos, em dois grupos sendo G1 para indivíduos com menores valores de PA ou FC em repouso e G2 para indivíduos com maiores valores de PA ou FC em repouso. Os grupos realizaram um protocolo de exercício aeróbio com velocidade de 60% da velocidade máxima atingida em teste de esforço máximo conforme limiar de Conconi. Foram analisados os índices de variabilidade da frequência cardíaca (SDNN, rMSSD, pNN50, HF, LF em ms² e nu, RRtri, TINN, SD1, SD2, SD1/SD2) e os parâmetros cardiorrespiratórios (PA sistólica e diastólica – PAS e PAD, FC e frequência respiratória – FR). Resultados: Houve significância nos momentos nos índices SDNN, rMSSD, pNN50, HF, LF(ms²) e (nu), RRtri, TINN, SD1, SD2, SD1/SD2 (p=0,001) e nas variáveis FC, FR, PAS e PAD (p=0,001) nos indivíduos normotensos. O G2 apresentou maiores valores de FC, PAS e PAD, retorno mais lento da FC e FR, apresentou predominantemente menores médias na modulação global, parassimpática e maiores médias na modulação simpática, retorno lento na recuperação da modulação global, parassimpática e simpática aos valores em repouso comparado ao G1. Houve significância nos momentos nos índices rMSSD (p=0,0001), HF ms² e nu (p=0,0001), SD1 (p=0,0001) e nas variáveis FC (p<0,0001), FR (p=0,0001), PAS (p=0,0001) e PAD (p=0,0001) nos indivíduos com diferentes valores de FC de repouso. G1 apresentou predominantemente maiores médias e retorno lento da modulação parassimpática, apresentou predominantemente menores valores de FC, FR, PAD, retorno lento da FC e PAS aos valores em repouso comparado ao G2. Conclusões: Sujeitos com maior PA em repouso mostraram recuperação mais lenta do controle autonômico da FC e das variáveis cardiorrespiratórias após exercício aeróbio submáximo comparado a menor PA em indivíduos normotensos. E sujeitos com maior FC de repouso mostraram recuperação mais rápida do controle autonômico da FC e das variáveis cardiorrespiratórias após exercício aeróbio submáximo comparado a menor FC de repouso em indivíduos saudáveis fisicamente ativos.
Introduction: Blood pressure (BP) and resting heart rate (HR) are important cardiovascular parameters and provide information that influences autonomic heart rate modulation in exercise recovery. It is unclear in the literature whether normotensive individuals and physically actives individuals with different HR values at rest may present different responses in exercise recovery. Objective: To analyze the recovery after submaximal aerobic exercise in healthy physically active individuals with different BP values and different HRs at rest. Methods: The study was conducted with 47 healthy young males aged 18 to 30 years, in two groups being G1 for individuals with lower BP or resting HR values and G2 for individuals with higher BP and resting HR values. The groups performed an aerobic exercise protocol with a velocity of 60% of the maximum velocity reached in the maximal stress test according to the Conconi threshold. The heart rate variability indices were analyzed (SDNN, rMSSD, pNN50, HF, LF, in ms² and nu, RRtri, TINN, SD1, SD2, SD1/SD2) and cardiorespiratory parameters (systolic and diastolic BP - SBP and DBP, FC and respiratory rate - RR). Results: There were significant differences in the SDNN, rMSSD, pNN50, HF, LF (ms²) and (nu), RRtri, TINN, SD1, SD2, SD1 / SD2 and p <0.001. p = 0.001) in normotensive individuals. G2 presented higher values of HR, SBP and DBP, slower HR and RR regression, presented predominantly lower mean in global modulation, parasympathetic and higher means in sympathetic modulation, slow return in global modulation recovery, parasympathetic and sympathetic to baseline values compared to G1. There was significant significance at the time points in the rMSSD (p = 0.0001), HF ms² and nu (p = 0.0001), SD1 (p = 0.0001) , RR (p = 0.0001), SBP (p = 0.0001) and DBP (p = 0.0001) in individuals with different HR values at rest. G1 presented predominantly higher mean values and slow return of the parasympathetic modulation, presented predominantly lower values of HR, RR, DBP, slow HR and SBP return to baseline values compared to G2. Conclusions: Subjects with higher BP at rest showed slower recovery of the autonomic control of HR and of cardiorespiratory variables after aerobic submaximal exercise compared to lower BP in normotensive individuals. And subjects with higher resting HR showed a faster recovery of the autonomic control of HR and of cardiorespiratory variables after aerobic submaximal exercise compared to lower resting HR in physically active healthy individuals.
Introduction: Blood pressure (BP) and resting heart rate (HR) are important cardiovascular parameters and provide information that influences autonomic heart rate modulation in exercise recovery. It is unclear in the literature whether normotensive individuals and physically actives individuals with different HR values at rest may present different responses in exercise recovery. Objective: To analyze the recovery after submaximal aerobic exercise in healthy physically active individuals with different BP values and different HRs at rest. Methods: The study was conducted with 47 healthy young males aged 18 to 30 years, in two groups being G1 for individuals with lower BP or resting HR values and G2 for individuals with higher BP and resting HR values. The groups performed an aerobic exercise protocol with a velocity of 60% of the maximum velocity reached in the maximal stress test according to the Conconi threshold. The heart rate variability indices were analyzed (SDNN, rMSSD, pNN50, HF, LF, in ms² and nu, RRtri, TINN, SD1, SD2, SD1/SD2) and cardiorespiratory parameters (systolic and diastolic BP - SBP and DBP, FC and respiratory rate - RR). Results: There were significant differences in the SDNN, rMSSD, pNN50, HF, LF (ms²) and (nu), RRtri, TINN, SD1, SD2, SD1 / SD2 and p <0.001. p = 0.001) in normotensive individuals. G2 presented higher values of HR, SBP and DBP, slower HR and RR regression, presented predominantly lower mean in global modulation, parasympathetic and higher means in sympathetic modulation, slow return in global modulation recovery, parasympathetic and sympathetic to baseline values compared to G1. There was significant significance at the time points in the rMSSD (p = 0.0001), HF ms² and nu (p = 0.0001), SD1 (p = 0.0001) , RR (p = 0.0001), SBP (p = 0.0001) and DBP (p = 0.0001) in individuals with different HR values at rest. G1 presented predominantly higher mean values and slow return of the parasympathetic modulation, presented predominantly lower values of HR, RR, DBP, slow HR and SBP return to baseline values compared to G2. Conclusions: Subjects with higher BP at rest showed slower recovery of the autonomic control of HR and of cardiorespiratory variables after aerobic submaximal exercise compared to lower BP in normotensive individuals. And subjects with higher resting HR showed a faster recovery of the autonomic control of HR and of cardiorespiratory variables after aerobic submaximal exercise compared to lower resting HR in physically active healthy individuals.
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Palavras-chave
Sistema nervoso autônomo, Pressão arterial, Frequência cardíaca, Exercício, Autonomic nervous system, Blood pressure, Heart rate, Exercise