Abstract
Purpose
To assess the impact of obesity and population attributes on the circadian pattern of cardiac autonomic modulation (CAM) in a population-based sample of adolescents.
Methods
We used data from 421 adolescents who completed the follow-up exam in the Penn State Children Cohort study. CAM was assessed by heart rate variability (HRV) analysis of beat-to-beat, normal R–R intervals from a 24-hour ECG, on a 30-minute basis. The HRV indices included frequency-domain (HF, LF, and LF/HF ratio) and time-domain (SDNN, RMSSD, and HR) variables. Nonlinear mixed-effect models were used to calculate a cosine periodic curve, each having three parameters quantifying its circadian period: M (mean levels of the HRV variables), Â (amplitude of the oscillation), and θ (the time of the highest oscillation).
Results
The mean (SD) age was 16.9 (2.2) years, with 54 % male and 77 % white. The mean BMI percentile was 66, with 16 % obese (BMI percentile ≥ 95). Overall, HF (a marker of parasympathetic modulation) gradually increased from the late afternoon, reached peak amplitude around 3 a.m., and then decreased throughout the daytime until late afternoon. In contrast, obesity had adverse effects on all circadian parameters. The age, sex and race showed varying differences on the CAM circadian parameters. The adjusted means (95 %Cls) of M, Â, and θ for HF were 5.99 (5.79–6.19), 0.77 (0.66–0.89), 3:15 (2:15–4:15) a.m., and 6.21 (6.13–6.29), 0.66 (0.61–0.70), 2:45 (2:30–3:15) a.m. for obese and non-obese subjects, respectively.
Conclusion
The circadian pattern of CAM can be quantified by the three cosine parameters. Obesity is associated with lower HRV even in young individuals like children/adolescents.
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Acknowledgments
The authors gratefully acknowledge the adolescents and their parents who participated in this study. This project was supported by National Institutes of Health (NIH) Grants: 1 R01 HL 097165, R01 HL63772, R21HL087858, and the Penn State CTSI Grant UL Tr000127. The content is solely the responsibility of the authors and does not necessarily represent the official views of the NIH.
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The authors declare that they have no conflict of interest.
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Rodríguez-Colón, S., He, F., Bixler, E.O. et al. The circadian pattern of cardiac autonomic modulation and obesity in adolescents. Clin Auton Res 24, 265–273 (2014). https://doi.org/10.1007/s10286-014-0257-7
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DOI: https://doi.org/10.1007/s10286-014-0257-7