Cardiology in the young | 2019
Non-linear regulation of cardiac autonomic modulation in obese youths: interpolation of ultra-short time series.
Abstract
BACKGROUND\nIn this study, we applied ultra-short time series of interbeat intervals (RR-intervals) to evaluate heart rate variability through default chaotic global techniques with the purpose of discriminating obese youths from non-obese youth patients.\n\n\nMETHOD\nChaotic global analysis of the RR-intervals from the electrocardiogram and pre-processing adjustments was undertaken. The effect of cubic spline interpolations was assessed, while the spectral parameters remained fixed. Exactly, 125 RR-intervals of data were recorded.\n\n\nRESULTS\nCFP1, CFP3, and CFP6 were the only significant combinations of chaotic globals when the standard conditions were enforced and at the level p<0.01 (or <1%). These significances were acheived via Kruskal-Wallis and Cohen s ds effects sizes tests of significance after Anderson-Darling and Lilliefors statistical tests indicated non-normal distributions in the majority of cases. Adjustments of the cubic spline interpolation from 1 to 13\xa0Hz were revealed to be inconsequential when measured by Kruskal-Wallis and Cohen s ds, regarding the outcome between the two datasets.\n\n\nCONCLUSION\nChaotic global analysis was offered as a robust technique to distinguish autonomic dysfunction in obese youths. It can discriminate the two different groups using ultra-short data lengths, and no cubic spline interpolations need be applied.