Table 1.
Heart rate variability descriptive data.
| Variable | M | SD | Min | Max |
|---|---|---|---|---|
| True baseline | ||||
| Interbeat interval (ms) | 959.76 | 142.93 | 683.22 | 1251.64 |
| High-frequency power (RSARAW, ms2) | 1974.45 | 2010.45 | 34.51 | 9235.80 |
| Low-frequency power (ms2) | 1095.78 | 1502.02 | 52.36 | 6675.41 |
| Low frequency–high frequency ratio | 0.83 | 1.31 | 0.06 | 7.72 |
| ln high-frequency power (ln ms2) | 3.05 | 0.54 | 1.54 | 3.97 |
| ln low-frequency power (ln ms2) | 2.74 | 0.53 | 1.72 | 3.82 |
| Speech preparation task | ||||
| Interbeat interval (ms) | 725.28 | 145.40 | 485.15 | 975.38 |
| High-frequency power (RSARAW, ms2) | 567.10 | 613.42 | 7.95 | 2976.17 |
| Low-frequency power (ms2) | 462.89 | 386.36 | 25.93 | 1541.86 |
| Low frequency–high frequency ratio | 1.20 | 0.90 | 0.35 | 3.79 |
| ln high-frequency power (ln ms2) | 2.51 | 0.54 | 0.90 | 3.47 |
| ln low-frequency power (ln ms2) | 2.49 | 0.45 | 1.41 | 3.19 |
Note. RSA = respiratory sinus arrhythmia.