M Sekine1, I Izumi, T Yamagami, S Kagamimori. 1. Department of Welfare Promotion and Epidemiology, Faculty of Medicine, Toyama Medical and Pharmaceutical University, 2630 Sugitani, 930-0194, Toyama City, Japan, sekine@mstoyama-mpuac.jp.
Abstract
OBJECTIVES: To determine the relationship between obesity and cardiac autonomic nerve activity in healthy children. METHODS: 16 healthy male children comprising of 9 nonobese and 7 obese subjects (body mass index > 19.1 kg/m(2)) aged 8-9 years were selected. Electrocardiograms were measured for 10 min. under controlled ventilation (0.25 Hz) in the supine position. Consecutive 256-second RR interval data were transformed by the Fast Fourier Transform method into power spectral data. Very low frequency (VLF; 0.003-0.04 Hz), low frequency (LF; 0.04-0.15Hz), high frequency (HF; 0.15-0.40Hz), and total power (TP; 0.003-0.40Hz) were calculated and transformed into a natural logarithm (In). Normalized units (nu) were also calculated as follows: LFnu=LF/(TP-VLF)x100. HFnu=HF/(TP-VLF)x100. Low/high-frequency ratio (LHR) was calculated as LF divided by HF. Unpaired t test was performed to compare the 2 groups. RESULTS: TP In and HFnu, reflecting cardiac parasympathetic nerve activity, in obese children were significantly lower than those in nonobese children. In contrast, LFnu and LHF, reflecting cardiac sympathetic nerve activity, in obese children were significantly higher than those in nonobese children. CONCLUSIONS: These findings suggest that obese children have higher sympathetic nerve activity and lower parasympathetic nerve activity than nonobese children.
OBJECTIVES: To determine the relationship between obesity and cardiac autonomic nerve activity in healthy children. METHODS: 16 healthy male children comprising of 9 nonobese and 7 obese subjects (body mass index > 19.1 kg/m(2)) aged 8-9 years were selected. Electrocardiograms were measured for 10 min. under controlled ventilation (0.25 Hz) in the supine position. Consecutive 256-second RR interval data were transformed by the Fast Fourier Transform method into power spectral data. Very low frequency (VLF; 0.003-0.04 Hz), low frequency (LF; 0.04-0.15Hz), high frequency (HF; 0.15-0.40Hz), and total power (TP; 0.003-0.40Hz) were calculated and transformed into a natural logarithm (In). Normalized units (nu) were also calculated as follows: LFnu=LF/(TP-VLF)x100. HFnu=HF/(TP-VLF)x100. Low/high-frequency ratio (LHR) was calculated as LF divided by HF. Unpaired t test was performed to compare the 2 groups. RESULTS: TP In and HFnu, reflecting cardiac parasympathetic nerve activity, in obesechildren were significantly lower than those in nonobese children. In contrast, LFnu and LHF, reflecting cardiac sympathetic nerve activity, in obesechildren were significantly higher than those in nonobese children. CONCLUSIONS: These findings suggest that obesechildren have higher sympathetic nerve activity and lower parasympathetic nerve activity than nonobese children.
Entities:
Keywords:
autonomic nerve activity; children; heart rate variability; obesity; the Toyama Birth Cohort Study
Authors: Katja Weimer; Helene Sauer; Bjoern Horing; Francesco Valitutti; Nazar Mazurak; Stephan Zipfel; Andreas Stengel; Paul Enck; Isabelle Mack Journal: Nutrients Date: 2018-05-31 Impact factor: 5.717
Authors: Antonio Ivano Triggiani; Anna Valenzano; Valentina Trimigno; Antonella Di Palma; Fiorenzo Moscatelli; Giuseppe Cibelli; Giovanni Messina Journal: PLoS One Date: 2019-09-25 Impact factor: 3.240