Variabilidade da frequência cardíaca após treinamento concorrente : comparação entre homens e mulheres de meia-idade = Heart rate variability after concurrent training : comparison between middle-aged men and women / Heart rate variability after concurrent training : comparison between middle-aged men and women

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

04/05/2012

RESUMO

The autonomic nervous system dysfunction and the increase in chronic degenerative diseases are manifested by the aging process, leading to changes of the autonomic modulation cardiac, and therefore the heart rate variability. Regarding the response of the autonomic nervous system and cardiorespiratory adaptive responses are even less enlightening evidencing the questions regarding the optimal training load for the acquisition of proportional adjustments to the training protocols alone. Autonomic adjustments resulting from physical training are already well established in the literature, such as the occurrence of bradycardia at rest and improvement in indices of heart rate variability. However, other types of training, such as concurrent training, combining weight training with aerobic training, are asked about the changes obtained. This study aimed to evaluate the autonomic adaptations in response to concurrent training in men and women between 40 and 60 with non-active lifestyle. The volunteers were divided into four groups, one with concurrent training for men (TCH), one with concurrent training for women (TCM), group sedentary men (SH) and group sedentary women (SM). Before and after 16 weeks of the experimental protocol, subjects underwent evaluation of cardiovascular autonomic components expressed by heart rate variability (time domain and frequency), obtained and analyzed through the records of the electrocardiogram RR intervals collected at rest supine and breathing spontaneously. To evaluate the cardiorespiratory fitness (VO2peak) was performed a ramp protocol on a treadmill with increasing speed increments until exhaustion. Muscle strength was assessed by testing one repetition maximum (1-RM). Among the results, it was verified that the proposed concurrent training program do not seem to change and do not adversely affect the cardiovascular variables at rest. None of the groups was verified reduction in resting heart rate, blood pressure, or changes in autonomic variables. Moreover, in cardiorespiratory evaluation, TCH and TCM showed significant improvement for VO2peak (TCH = pre: 31,63 ± 5,37 and after: 35,78 ± 5,23ml/kg/min; TCM pré 26,18 = ± 3,00 and after: 28,41 ± 2,34ml/kg/min). For the group TCM similar gains were observed when the percentage change was calculated. Since the component of muscle strength significantly improved for the TCH arm in the three exercises tested (supine before: 68,88 ± 5,79 and after: 86,13 ± 9,78 kg, leg press before: 190,63 ± 2,28 and after: 315,25 ± 67,74kg; before arm curl : 36,75 ± 3,6 and after: 46,50 ± 4,69kg) and the TCM in just two exercise tested (supine before: 39,87 ± 4,58 and after: 46,75 ± 6,62 kg); before arm curl: 23,50 ±3,81 and after: 26,00 ± 2,13 kg .) Thus, concurrent training seems to be a good alternative training methodology and gains in the various physical capabilities assessed, but did not cause changes in cardiovascular function. Further investigations are needed to establish the effect of weight training and competing in cardiovascular variables at rest.

ASSUNTO(S)

treinamento concorrente gênero sistema nervoso autônomo meia idade variabilidade do batimento cardíaco concurrent training gender autonomic nervous system middle-aged heart rate variability

ACESSO AO ARTIGO

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