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Heart rate variability in obese children: relations to total body and visceral adiposity, and changes with physical training and detraining.
Gutin, B; Barbeau, P; Litaker, M S; Ferguson, M; Owens, S.
Afiliação
  • Gutin B; Georgia Prevention Institute, Department of Pediatrics, Medical College of Georgia, 30912, USA. bgutin@mail.mcg.edu
Obes Res ; 8(1): 12-9, 2000 Jan.
Article em En | MEDLINE | ID: mdl-10678254
OBJECTIVE: Heart rate variability provides non-invasive information about cardiac parasympathetic activity (PSA). We determined in obese children: (1) relations of baseline PSA to body composition and hemodynamics; (2) effects of physical training (PT) and cessation of PT; and (3) which factors explained individual differences in responsivity of PSA to the PT. RESEARCH METHODS AND PROCEDURES: The root mean square of successive differences (RMSSD) was the index of PSA. Obese children (n = 79) were randomly assigned to groups that participated in PT during the first or second 4-month periods of the study. RESULTS: Baseline RMSSD was significantly (p<0.05) associated with lower levels of: fat mass, fat-free mass, subcutaneous abdominal adipose tissue, resting heart rate (HR), resting systolic blood pressure, and exercise HR. Stepwise multiple regression produced a final model (R2 = 0.36) that included only resting HR. The analysis of changes over the three time points of the study found a significant (p = 0.026) time by group interaction, such that RMSSD increased during periods of PT and decreased following cessation of PT. Greater individual increases in response to the PT (p<0.05) were seen in those who had lower pre-PT RMSSD levels, showed the greatest decreases in resting HR, and increased most in vigorous physical activity. The final regression model retained only the change in resting HR as a significant predictor of the changes in the RMSSD (R2 = 0.23). DISCUSSION: Regular exercise that improved fitness and body composition had a favorable effect on PSA in obese children.
Assuntos
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Base de dados: MEDLINE Assunto principal: Composição Corporal / Exercício Físico / Tecido Adiposo / Frequência Cardíaca / Obesidade Idioma: En Ano de publicação: 2000 Tipo de documento: Article
Buscar no Google
Base de dados: MEDLINE Assunto principal: Composição Corporal / Exercício Físico / Tecido Adiposo / Frequência Cardíaca / Obesidade Idioma: En Ano de publicação: 2000 Tipo de documento: Article