Heart rate variability in childhood XXXX .

@entity1 @entity28 @entity412 @entity5433 @entity413
Obesity is characterized by hemodynamic and metabolic alterations. Autonomic control on cardiac function involvement is controversial. The aim of the study was to assess early sign of cardiac @entity5433 in @entity28 , using time- and frequency-domain heart rate variability (HRV) analysis in a pediatric population. METHODS: 32 @entity28 @entity1 (OB) (17 M, 15 F; 13.9 +/- 1.7 y) were compared with 13 healthy lean subjects (7 M, 6 F; 12.9 +/- 1.6 y). For each @entity1 , the authors performed a clinical examination, laboratory testing, blood pressure (BP) measurements, and 24-hour electrocardiograph/ambulatory BP monitoring. The spectral power was quantified in total power, low-frequency (LF) power, index of sympathetic tone, high-frequency (HF) power, index of vagal tone, and LF/HF ratio. Low frequency and HF were averaged to obtain 3 measures: 24-hour, daytime, and nighttime levels. Total, long-term, and short-term time-domain HRV values were calculated. RESULTS: The @entity28 @entity1 had higher casual and ambulatory BP, and higher fasting @entity413 , insulin, and @entity412 levels. Overall HRV values were not significantly lower in OB. The @entity28 @entity1 had significantly lower 24-hour and nighttime high-frequency normalized units, and time-domain measures of vagal activity. Low-frequency power showed an inverse but not significant pattern. The OB group had significantly greater 24-hour and nighttime LF/HF ratios. CONCLUSIONS: The authors found an increase in heart rate and in BP associated with parasympathetic heart rate control decrease in stabilized @entity28 normotensive @entity1 .
