Baroreflex sensitivity is reduced in obese normotensive children and adolescents.

Obesity is associated with autonomic nervous system dysfunction. The aim of the study was to evaluate baroreflex sensitivity, an indicator of autonomic nervous function, in 20 obese children and adolescents in comparison with 20 age- and sex-matched nonobese subjects. All subjects were examined in the supine position over a period of 50 min.

Changes in the cardiac autonomic regulation in children with attention deficit hyperactivity disorder (ADHD).

Background & Objective: ADHD is one of the most common mental disorders among children. We hypothesized that ADHD is associated with the impairment of the cardiac autonomic regulation. The aim of this study was to evaluate the cardiac autonomic regulation in children with ADHD at the rest and during orthostasis using short-term heart rate variability (HRV) analysis.

Recurrences in heart rate dynamics are changed in patients with diabetes mellitus.

Detection of subclinical autonomic dysfunction in patients with diabetes mellitus (DM) is of vital importance for risk stratification and subsequent management. Heart rate variability (HRV) analysis is a sensitive tool for assessment of cardiovascular autonomic dysfunction. As the heart is controlled by non-linear deterministic system, the non-linear dynamics measures should be preferred.

Short-term heart rate complexity is reduced in patients with type 1 diabetes mellitus.

Objective: The aim of this study was to test whether new heart rate variability (HRV) complexity measures provide diagnostic information regarding early subclinical autonomic dysfunction in diabetes mellitus (DM).

Methods: HRV in DM type 1 patients (n=17, 10f, 7m) aged 12.9-31.