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

Table 2

Comparison of uncontrolled normal and paced breathing conditions.

Variable	Normal breathing	Paced breathing	P-value	Correlation
	mean ± SE	mean ± SE
Respiratory quotient	0.85 ± 0.01	1.08 ± 0.01	𝑃<.001	𝑟<.55, 𝑃>.1
Oxygen consumption (mL·min^−1)	313 ± 18	353 ± 17	𝑃<.001	𝑟=.98, 𝑃<.01
Energy expenditure (Cal·min^−1)	1.5 ± 0.08	1.8 ± 0.08	𝑃<.001	𝑟=.98, 𝑃<.01
Standard deviation of RR intervals (ms)	80 ± 6	95 ± 10	𝑃<.05	𝑟=.58, 𝑃<.05
Total spectral power (ms^2·10^3)	445 ± 8	528 ± 8	𝑃<.001	𝑟=.60, 𝑃<.05
Very-low-frequency spectral power (ms^2·10^3)	65 ± 2	91 ± 2	𝑃<.001	𝑟=.96, 𝑃<.01
Low-frequency·high-frequency^−1 spectral power	0.6 ± 0.2	0.8 ± 0.2	𝑃>0.1	𝑟<.55, 𝑃>.1