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. 2011 Jun 20;2011:715361. doi: 10.1155/2011/715361

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Copyright © 2011 Richard M. Millis et al.

This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Correlation of very-low-frequency spectral power of heart rate variability with resting energy expenditure. Linear regression for raw (ms²) units of very-low-frequency (VLF) power computed from fast Fourier transform analysis of electrocardiogram RR intervals for ten healthy 18–20-year-old African American males during 20 min trials of uncontrolled breathing (a) and paced breathing at 0.2 Hz (b) after metabolic provocation with a 900 Cal test beverage. R2 = .86 and .92; P < .001, 8 df, respectively.