摘要：Santos RRC, Molina GE, Rosa ECCC, Amato AA. Impact of Lifestyle on Autonomic Cardiac Function in Response to Orthostatic Stress in Young Active Men. JEPonline 2019;22(3):42-56. The purpose of this study was to verify the association between lifestyle factors using an integrated approach by caloric expenditure by intensity of physical activity, sedentary behavior and sleep quality index, and autonomic cardiac function in response to orthostatic stress of 35 young, healthy, and physically active men. The lifestyle factors were checked by the International Physical Activity Questionnaire (IPAQ) and Pittsburgh Sleep Quality Index (PSQI). The factors included the energy expenditure in physical activity at moderate/vigorous and low intensity, sedentary behavior and sleep quality. The cardiac autonomic function was evaluated by the temporal indices of the heart rate variability (HRV) obtained through 5-min registers in the supine and orthostatic positions, considering for the purpose of this study, the effect of the change of position. Negative interactions were found between the PSQI and the iR-R index (P = 0.05) and positive between the sedentary behavior and the vagal predominance index, pNN50 (P = 0.03) and r-MSSD (P = 0.05). When the analysis was performed in conjunction with intervening factors, and then verified the significance of the model studied, the results were not significant. The findings demonstrate that aspects related to lifestyle are associated with cardiac autonomic function when subjected to orthostatic stress when disregarding intervening factors.
