Índices geométricos de variabilidade da frequência cardíaca em crianças obesas e eutróficas

Abstract

Background: Obesity causes changes in cardiac autonomic modulation.

Auditory stimulation with music influences the geometric indices of heart rate variability in men

“…On the other hand, the effect of heavy metal music on global HRV was not investigated yet.The literature indicated that some styles of music, such as techno music, hip hop and heavy metal [18] are usually related to arousal responses, but not pathological [19]. A previous investigation observed that musical auditory stimulation with techno style induced increases in cortisol, norepinephrine, and adrenocorticotropic hormone levels related to the sympathetic nervous system and heart rate [20,21]. As evidence, our data indicated that this style of music acutely reduced HRV in men, suggesting acute decrease of cardiac autonomic regulation during this situation.…”

Geometric indexes of heart rate of variability identifies autonomic alterations in young patients with type 1 diabetes mellitus

“…The RRtri and TINN indexes were calculated from the construction of the density histogram of the normal RR, which all possible values of RR are shown on the horizontal axis (x-axis) and on the vertical axis (y-axis) the frequency in which they occurred (17). The RRtri index is the integral of the histogram (total number of RR) divided by the maximum density distribution (the modal frequency of RR), measured on a discrete scale with boxes of 7.8125 ms (1/128 s), while the triangular interpolation interval histogram of RR (TINN) is the baseline width of the distribution, measured as the base of the triangle, with the error of least squares used to determine the triangle (27).…”

“…Nonlinear methods are based on chaos theory and may enable better discrimination between normal and abnormal ANS physiology (6). For example, the Poincaré plot is a method used for geometric and nonlinear analysis of the autonomic modulation (16)(17)(18). A previous study involving type 2 diabetic individuals assessed different methods of HRV and reported that geometric methods are more reliable for evaluating the presence of an autonomic diabetic disease (19), and studies that analyze this type of indexes in DM1 population were not deeply explored.…”

Childhood Obesity and Autonomic Dysfunction: Risk for Cardiac Morbidity and Mortality

“…They were able to find that being overweight and obese was associated with decreased parasympathetic (lower HF) and increased sympathetic modulation (higher LF and LF/HF ratio) [21]. In contrast, only few reports have shown that obesity in children cause a reduction [22, 60] or no effect [18, 19, 25] in the sympathetic activity of the heart. For example, Vanderlei and coworkers studied 56 obese children and found that these obese children have decreased sympathetic activity (low LF) than lean children [22].…”

“…In contrast, only few reports have shown that obesity in children cause a reduction [22, 60] or no effect [18, 19, 25] in the sympathetic activity of the heart. For example, Vanderlei and coworkers studied 56 obese children and found that these obese children have decreased sympathetic activity (low LF) than lean children [22]. Furthermore, Birch et al, found that overweight/obese children have lower parasympathetic activity (low HF, RMSSD), no difference were found in the sympathetic activity (LF and LF/HF ratio), than children of normal weight [19].…”