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Int J Sports Med 2010; 31(12): 860-865
DOI: 10.1055/s-0030-1267158
Training & Testing

© 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

D. M. Prado1 , A. G. Silva1 , I. C. Trombetta2 , M. M. Ribeiro1 , I. C. Guazzelli1 , L. N. Matos2 , M. S. Santos2 , C. M. Nicolau1 , C. E. Negrão2 , S. M. Villares1
  • 1Medical School, Department of Endocrinology, University of São Paulo, Brazil
  • 2Medical School, Heart Institute (InCor), University of São Paulo, Brazil
Further Information

Publication History

accepted after revision August 27, 2010

Publication Date:
11 November 2010 (online)

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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

Phone: +5511/3061 7253

Fax: +5511/3061 7467

Email: danilomprado@usp.br