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Journal of Nutrition and Metabolism
Volume 2011, Article ID 715361, 6 pages
http://dx.doi.org/10.1155/2011/715361
Research Article

Metabolic Energy Correlates of Heart Rate Variability Spectral Power Associated with a 900-Calorie Challenge

1Department of Physiology & Biophysics, Howard University College of Medicine, Washington, DC 20059, USA
2Department of Health, Human Performance and Leisure Studies, Howard University College of Arts and Sciences, Washington, DC 20059, USA
3Department of Medicine, Howard University Hospital, Washington, DC 20060, USA

Received 4 February 2011; Revised 29 March 2011; Accepted 20 April 2011

Academic Editor: Ngoc-Anh Le

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.

Abstract

We studied healthy males challenged with a 900 Cal test beverage and correlated EE with the raw (ms2) and normalized units (nu) of total power (TP), low frequency/high frequency (LF/HF) and VLF spectral power of heart rate variability (HRV). The correlations were evaluated during 20 min of normal breathing (NB, control) and 20 min of paced breathing (PB) at 12 breaths min−1 (0.2 Hz). EE was not significantly correlated with any of the HRV variables before the metabolic challenge. After the challenge, EE was positively correlated with LF/HF and with VLF; VLF was also positively correlated with LF/HF during both NB and PB. These findings suggest that EE may be a correlate of LF/HF and of VLF spectral power of HRV in healthy adolescent/young adult males. The association of lower resting energy expenditure with lower amounts of VLF spectral power may occur in individuals with predilections for obese phenotypes.