Table 2.
Descriptive Statistics for the Physiological Outcomes
| Baseline Periods | Task Periods | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | Model Estimated | 1 | 2 | 3 | 4 | Model Estimated | |
| PEP | 120.43 (.97) | 121.26 (.94) | 121.44 (.98) | 121.91 (.96) | 122.28 (.99) | 121.44 (.95) | 121.98 (1.05) | 122.72 (1.09) | 122.82 (1.03) | 122.28 (1.11) | 122.42 (1.05) |
| RZ | 155.85 (1.63) | 157.36 (1.57) | 157.84 (1.65) | 158.63 (1.59) | 159.26 (1.66) | 157.77 (1.59) | 157.86 (1.78) | 159.08 (1.84) | 159.49 (1.69) | 158.53 (1.88) | 158.70 (1.76) |
| RSA | 6.21 (.14) | 6.24 (.15) | 6.16 (.15) | 6.14 (.14) | 6.06 (.15) | 6.17 (.14) |
6.34 (.13) | 6.39 (.14) | 6.43 (.13) | 6.47 (.13) | 6.42 (.12) |
| RMSSD | 52.50 (4.95) | 50.80 (4.20) | 49.12 (4.17) | 48.90 (4.07) | 48.73 (4.82) | 50.24 (4.29) | 51.73 (4.08) | 52.01 (3.65) | 54.41 (4.71) | 52.59 (4.20) | 52.93 (3.98) |
| IBI | 775.42 (12.90) | 773.83 (12.58) | 764.64 (12.30) | 768.06 (11.94) | 766.81 (12.17) | 769.56 (12.22) | 780.58 (12.64) | 787.81 (11.91) | 786.08 (12.34) | 778.66 (11.94) | 783.75 (11.79) |
| Respiration | 18.39 | 18.01 | 17.77 | 18.00 | 17.91 | 18.04 | 18.14 | 17.50 | 17.56 | 17.18 | 17.59 |
| Rate | (.33) | (.33) | (.33) | (.31) | (33) | (.27) | (.36) | (.35) | (.34) | (.34) | (.28) |
Note.n = 111. Standard errors are in parentheses. PEP = pre-ejection period (in ms); RZ = RZ interval (in ms); RSA = respiratory sinus arrhythmia (in ms2); RMSSD = root mean square of successive differences in the IBI series; IBI = interbeat interval (in ms); respiration rate is in cycles per minute. These values are raw descriptive statistics, except for the “Model Estimated” columns, which report the baseline and task values estimated from the multilevel models. Note that the model-estimated values do not varywithin the baseline and task periods.