Cardiac Autonomic Adjustments During Baroreflex Test in Obese and Non-Obese Preadolescents.

Background: Recent studies have shown changes in cardiac autonomic control of obese preadolescents.

Objective: To assess the heart rate responses and cardiac autonomic modulation of obese preadolescents during constant expiratory effort.

Methods: This study assessed 10 obese and 10 non-obese preadolescents aged 9 to 12 years.

Proposal intensity adequacy of expiratory effort and heart rate behavior during the valsalva maneuver in preadolescents.

Background: When performing the Valsalva maneuver (VM), adults and preadolescents produce the same expiratory resistance values.

Objective: To analyze heart rate (HR) in preadolescents performing VM, and propose a new method for selecting expiratory resistance.

Method: The maximal expiratory pressure (MEP) was measured in 45 sedentary children aged 9-12 years who subsequently performed VM for 20 s using an expiratory pressure of 60%, 70%, or 80% of MEP.

Method of heart rate variability threshold applied in obese and non-obese pre-adolescents.

Background: The detection of anaerobic threshold (AT) by heart rate variability analysis (HRVt) may mean a new way to assess the cardiorespiratory capacity (CRC) in pre-adolescents.

Objective: To test the method of HRVt to detect AT in non-obese (NO), obese (O) and morbidly obese (MO) pre-adolescents in order to determine differences in their CRC.

Methods: Were studied 30 pre-adolescents, aged between 9 and 11 years, divided into three groups of ten pre-adolescents each: a) NO group - body mass index (BMI) between 5 and 85 percentiles of the chart of National Center for Chronic Disease Prevention and Health Promotion.

Heart rate variability, blood lipids and physical capacity of obese and non-obese children.

Background: Obesity can affect the cardiac autonomic modulation, blood lipid levels and the physical capacity.

Objective: To study the effect of obesity on the heart rate variability (HRV), blood lipid levels and physical capacity of obese children.

Methods: Thirty children aged 9 to 11 years were studied, divided in two groups: a) 15 obese children (O) aged 10.

Evaluation of heart rate variability in trained and sedentary climacteric women.

Background: Changes in autonomic cardiac function are frequent during menopause, and various methods have been used to understand and minimize them.

Objective: To study the interference of dynamic aerobic physical activity on heart rate variability (HRV) in climacteric women.

Methods: Cross-sectional study that analyzed HRV in 15 menopausal women (mean age 56.