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DOI: 10.1055/s-0030-1267158
© J. A. Barth Verlag in Georg Thieme Verlag KG Stuttgart · New York
Exercise Training Associated with Diet Improves Heart Rate Recovery and Cardiac Autonomic Nervous System Activity in Obese Children
Publikationsverlauf
accepted after revision August 27, 2010
Publikationsdatum:
11. November 2010 (online)
![](https://www.thieme-connect.de/media/sportsmed/201012/lookinside/thumbnails/10.1055-s-0030-1267158-1.jpg)
Abstract
The purpose of this study was to test the hypotheses that in obese children: 1) hypocaloric diet (D) improves both heart rate recovery at 1 min (Δ HRR1) cfter an exercise test, and cardiac autonomic nervous system activity (CANSA) in obese children; 2) Diet and exercise training (DET) combined leads to greater improvement in both Δ HRR1 after an exercise test and in CANSA, than D alone. Moreover, we examined the relationships among Δ HRR1, CANSA, cardiorespiratory fitness and anthropometric variables (AV) in obese children submitted to D and to DET. 33 obese children (10±0.2 years; body mass index (BMI) >95th percentile) were divided into 2 groups: D (n=15; BMI=31±1 kg/m2) and DET (n=18; 29±1 kg/m2). All children performed a maximal cardiopulmonary exercise test on a treadmill. The Δ HRR1 or LF/HF ratio (P>0.05). In contrast, the DET group showed increased peak VO2 (P=0.01) and improved Δ HRR1 (Δ HRR1=37.3±2.6; P=0.01) and LF/HF ratio (P=0.001). The DET group demonstrated significant relationships among Δ HRR1, peak VO2 and CANSA (P<0.05). In conclusion, DET, in contrast to D, promoted improved ÄΔ HRR1 and CANSA in obese children, suggesting a positive influence of increased levels of cardiorespiratory fitness by exercise training on cardiac autonomic activity.
Key words
childhood obesity - exercise training - cardiac autonomic activity - heart rate recovery - cardiorespiratory fitness
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Correspondence
Dr. Danilo Marcelo Prado
Medical School
Endocrinology
University of São Paulo
Av. Dr. Arnaldo, 455, Sala 4305
05403-900 São Paulo
Brazil
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