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. Author manuscript; available in PMC: 2013 Aug 14.
Published in final edited form as: Life Sci. 2009 Dec 1;86(0):153–157. doi: 10.1016/j.lfs.2009.11.018

Fig. 1.

Fig. 1

Correlation of body fat percentage and heart rate variability during spontaneous breathing. Linear regression for percent body fat measured by dual x-ray absorptiometric (DEXA) whole body scanning and heart rate variability low frequency/high frequency power ratio (LF/HF) computed from fast Fourier transform analysis of the electrocardiogram RR intervals in normalized units measured during uncontrolled breathing for eight healthy 18–20 year-old African-American male university students studied twice (n=16). Pearson's correlation coefficient, r=−0.56, two-tailed P<0.05, one-tailed P<0.01 for uncontrolled breathing.