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Excess weight in children and adolescents is associated with impaired cardiac autonomic modulationExcess Weight Linked to Changes in Children's Heart Rhythms

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Key Takeaway
Note that pediatric excess weight is associated with impaired cardiac autonomic modulation and lower parasympathetic indices.

This meta-analysis evaluated the impact of excess weight on cardiac autonomic modulation in a population of 1590 children and adolescents. The study synthesized data regarding heart rate variability (HRV) indices to determine how excess weight influences autonomic balance.

Key findings indicate that the excess weight group demonstrated significantly lower RMSSD (95%CI -1.68 to -0.31) and pNN50 (95%CI -0.68 to -0.28) compared to normal-weight controls. Additionally, the LF/HF ratio was higher in the excess weight group (95%CI 0.30 to 1.10), with a significant moderation by BMI difference (beta = -0.15, p=0.045). These results suggest impaired parasympathetic-related heart rate variability in children with excess weight.

While the meta-analysis provides evidence of an association between weight and cardiac autonomic modulation, the results are based on observational data. The study highlights the importance of monitoring cardiac autonomic function in pediatric patients with excess weight. Limitations regarding the specific study designs and the consistency of certain outcomes were not reported in the data provided.

How this fits prior evidence

This meta-analysis addresses a gap in understanding the physiological impacts of pediatric obesity beyond weight loss. While prior coverage noted that multidisciplinary interventions and Mediterranean diet adherence may modestly reduce BMI Z-score in pediatric obesity, this study provides evidence that excess weight is associated with impaired cardiac autonomic modulation. It specifically identifies lower parasympathetic-related heart rate variability indices in the excess weight group.

Researchers looked at data from 1,590 children and adolescents to see how excess weight affects the heart. They specifically looked at cardiac autonomic modulation, which is how the nervous system helps regulate heart rate. The study found that children with excess weight showed lower levels of parasympathetic activity, which is the part of the nervous system that helps the heart relax.

The study measured several markers of heart rate variability. These included RMSSD and pNN50, both of which were lower in the group with excess weight. They also found a higher LF/HF ratio in children with excess weight. These findings suggest that extra weight may be linked to less consistent heart rate patterns in young people.

Because this information comes from observational data, it shows a link rather than a direct cause. The results are important for understanding how weight affects heart health in children. However, these findings are part of a broad look at heart health and should be discussed with a doctor to understand what they mean for a specific child.

What this means for you:
Excess weight in children is linked to lower heart rate variability and changes in heart rhythm regulation.

Common questions

What did the study find about heart health and weight?

The study of 1,590 children and adolescents found that excess weight was linked to impaired cardiac autonomic modulation. Specifically, children with excess weight showed lower parasympathetic-related heart rate variability. This means the nervous system's ability to regulate the heart's rhythm may be affected by extra weight in young people.

What specific heart markers were affected?

The study measured several markers. The RMSSD and pNN50 values were lower in the group with excess weight. Additionally, the LF/HF ratio was higher in the group with excess weight. These markers help doctors understand how the nervous system interacts with the heart to control heart rate.

Does this mean excess weight causes heart problems?

The study shows a link between excess weight and heart rhythm changes, but it does not prove that one causes the other. Because the data comes from observational studies, it shows a connection rather than a direct cause. You should speak with a healthcare provider to discuss these findings regarding a child's specific health.

Study Details

Study typeMeta analysis
Sample sizen = 1,590
EvidenceLevel 1
PublishedJan 2026
View Original Abstract ↓
OBJECTIVE: To evaluate the association between excess weight and cardiac autonomic modulation in children and adolescents. DATA SOURCE: PubMed, Embase, and the Cochrane Central Register of Controlled Trials were searched from inception to April 2, 2026 for observational studies comparing short-term resting heart rate variability between children and adolescents with excess weight and normal-weight controls. The protocol was registered in PROSPERO (CRD420251005501). DATA SYNTHESIS: Eighteen studies comprising 1,590 participants were included. Random-effects meta-analyses using standardized mean differences showed lower root mean square of successive differences of RR intervals (RMSSD -1.00; 95% confidence interval [95%CI] -1.68 to -0.31), lower percentage of successive normal-to-normal intervals differing by more than 50 ms (pNN50 -0.48; 95%CI -0.68 to -0.28), and higher low-frequency/high-frequency ratio (LF/HF 0.70; 95%CI 0.30 to 1.10) in the excess weight group. No significant differences were observed for the standard deviation or mean of normal-to-normal intervals. Leave-one-out analyses supported directional robustness, and between-group body mass index difference significantly moderated LF/HF (β=-0.15; p=0.045), but not RMSSD. CONCLUSIONS: Pediatric excess weight appears to be associated with impaired cardiac autonomic modulation, mainly characterized by lower parasympathetic-related heart rate variability indices. Among the evaluated parameters, pNN50 showed the most consistent reduction, whereas RMSSD showed the largest pooled effect.
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