Key result
Heart-weakened children exhibited an autonomic nervous system imbalance characterized by higher LF norm and LF/HF ratio and lower HF norm compared to healthy children.
Why the study?
Does heart-weakened status alter heart rate variability in elementary school children compared to healthy children?
Cross-Sectional (n=62)
No
Does heart-weakened status alter heart rate variability in elementary school children compared to healthy children?
Heart-weakened children exhibit autonomic nervous system imbalance characterized by increased sympathetic and decreased parasympathetic nerve activity.
Suggests autonomic imbalance in heart-weakened children but should not change practice; leaves open causal and prognostic implications.
Objectives The purpose of this study is to evaluate the characteristics of autonomic nervous system in heart-weakened children via analyzing heart rate variability (HRV) compare to healthy children. Methods Among the children who have visited the department of pediatrics at OO oriental medicine hospital, the subjects were composed of 62 elementary school students without cardiac disorder, who have yet develop secondary sexual characteristics. Results 1. Mean HRT and SDNN of the heart-weakened group of children were lower than the healthy group, but with no statistical significance. 2. Heart-weakened children had higher LF norm and LF/HF ratio, but lower HF norm than healthy children. The rest of the Frequency Domain Index have no significant differences. 3. Heart-weak score showed a positive correlation with Mean HRT and LF/HF ratio. Conclusions Heart-weakened children had an imbalance in autonomic nervous system due to increase of sympathetic nerve activity and decrease of parasympathetic nerve activity.
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Lee et al. (2013) conducted a cross-sectional in Heart-weakened children (n=62). Heart-weakened condition vs. Healthy children was evaluated on Heart rate variability (HRV) parameters including Mean HRT, SDNN, LF norm, HF norm, and LF/HF ratio. Heart-weakened children exhibited an autonomic nervous system imbalance characterized by higher LF norm and LF/HF ratio and lower HF norm compared to healthy children.
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