期刊名称：Revista brasileira de crescimento e desenvolvimento humano
印刷版ISSN：0104-1282
电子版ISSN：2175-3598
出版年度：2018
卷号：28
期号：3
页码：298-306
DOI：10.7322/jhgd.152180
出版社：Centro de Estudos de Crescimento e Desenvolvimento do Ser Humano
摘要：Introduction: Heart rate variability (HRV) can be
assessed from RR-intervals. These are derived from an
electrocardiographic PQRST-signature and can deviate in
a chaotic or irregular manner. In the past, techniques from
statistical physics have allowed researchers to study such
systems.
Objective: This study planned to assess the heart rate
dynamics in young obese subjects by nonlinear metrics to
heart rate variability.
Method: 86 subjects were split equally according to status.
Heart rate was recorded with the subjects resting in a dorsal
(prone) position for 30 minutes. The complexity of the
RR-intervals was assessed by five Entropies, Detrended
Fluctuation Analysis, Higuchi and Katz’s fractal dimensions
Following inconclusive tests of normality we calculated the
One-Way Analysis of Variance, Kruskal-Wallis, and the Effect
Sizes by Cohen’s d significances.
Results: It was established that Shannon, Renyi and Tsallis
Entropies and the Higuchi and Katz’s fractal dimensions
could significantly discriminate the two groups. The three
entropies were higher in obese youths, suggesting less
predictable sets of RR intervals (p<0.0001; d≈1.0). Whilst the
Higuchi (p<0.003; d≈0.76) and Katz’s (p≈0.02; d≈0.57) fractal
dimensions were lower in obese youths.
Conclusion: As with chaotic globals an increase in response
was detected by three measures of entropy in young obese.
This is counter to the decreasing response detected by
fractal dimensions. Chaotic globals and entropies are more
dependable than fractal dimensions when assessing the
responses to obesity.
其他摘要：INTRODUCTION: Heart rate variability (HRV) can be assessed from RR-intervals. These are derived from an electrocardiographic PQRST-signature and can deviate in a chaotic or irregular manner. In the past, techniques from statistical physics have allowed researchers to study such systems OBJECTIVE: This study planned to assess the heart rate dynamics in young obese subjects by nonlinear metrics to heart rate variability METHOD: 86 subjects were split equally according to status. Heart rate was recorded with the subjects resting in a dorsal (prone) position for 30 minutes. The complexity of the RR-intervals was assessed by five Entropies, Detrended Fluctuation Analysis, Higuchi and Katz's fractal dimensions Following inconclusive tests of normality we calculated the One-Way Analysis of Variance, Kruskal-Wallis, and the Effect Sizes by Cohen's d significances RESULTS: It was established that Shannon, Renyi and Tsallis Entropies and the Higuchi and Katz's fractal dimensions could significantly discriminate the two groups. The three entropies were higher in obese youths, suggesting less predictable sets of RR intervals (p
