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 (ms2 ·103) | 445 ± 8 | 528 ± 8 | P < .001 | r = .60, P < .05 |
| Very-low-frequency spectral power (ms2 ·103) | 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 |