ABC | Volume 115, Nº1, July 2020

Original Article Vargas & Rigatto Parents’ BP and young men autonomic impairment Arq Bras Cardiol. 2020; 115(1):52-58 In our study, the FM-H group showed higher LFnu and LF/HF ratio than the FM-N group. In addition, in the FM-H group, the HFnu, in the frequency-domain, and SDNN, RMSSD, NN50, pNN50 and HRV triangular index, in the time-domain, were significantly lower than those from the FM-N group. These results indicate that family history of hypertension is accompanied by an increase in cardiac sympathetic modulation and a decrease in parasympathetic modulation, regardless of the normal BP of each soccer player. Moreover, Tozawa et al. 17 sought to determine whether the family history of hypertension was quantitatively associated with the prevalence of hypertension in a screened cohort. They concluded that the increasing number of family members with hypertension had a correlation with increased prevalence of higher BP, regardless of the conventional risk factors for hypertension. These findings are in agreement with ours, since we also found a significant difference in autonomic modulation only when both parents were hypertensive, emphasizing the importance of the genetic background for HRV, which is a predictor of cardiovascular risk. There is no doubt that physical exercise is associated with beneficial effects on BP. Because exercising is a healthy method of cardiovascular diseases control, 3 we have chosen to study only athletes. Our results emphasize the importance of the genetic background. Healthy and young athletes, who had hypertensive father and mother, presented a significant increase in the LF/HF ratio, as well as a reduction in HRV. Figure 1 – LF/HF= Ratio between low and high frequency power components, i.e., the autonomic balance of the FM-N, F-H, M-H and FM-H groups. *Differences between FM-H and FM-N groups (p<0.005). Table 4 – Brachial artery characteristics of athletes in supine position FM-N (n=14) F-H (n=11) M-H (n=10) FM-H (n=11) B-DIA (mm) 0.355±0.043 0.364±0.035 0.344±0.041 0.383±0.037 RH-DIA (mm) 0.387±0.042 0.387±0.028 0.366±0.042 0.402±0.045 FMD (%) 9.323±3.028 6.745±1.263 6.261±1.726 5.097±3.157 Before NTG (mm) 0.368±0.044 0.363±0.032 0.352±0.043 0.387±0.039 After NTG. (mm) 0.431±0.039 0.431±0.036 0.419±0.041 0.453±0.034 NTG (%) 17.639±7.086 18.920±3.991 19.472±6.456 17.678±7.503 B-DIA: basal brachial artery diameter; FMD: flow-mediated dilation; NTG: brachial artery diameter with nitroglycerin; RH-DIA: brachial artery diameter with reactive hyperemia. Values are expressed as mean ± SD. 56