Table 4.
Physiological Measures Over Time
| HRV values | Baseline | After tDCS | 1-month follow-up | ||||
|---|---|---|---|---|---|---|---|
| n | Mean (SD) | n | Mean (SD) | n | Mean (SD) | ||
| SBP | Active | 30 | 119.73 (16.88) | 30 | 119.57 (16.36) | 28 | 118.75 (15.58) |
| Sham | 30 | 119.57 (16.81) | 30 | 119.37 (16.20) | 26 | 117.15 (16.43) | |
| DBP | Active | 30 | 74.53 (9.78) | 30 | 75.10 (9.35) | 28 | 75.14 (8.92) |
| Sham | 30 | 78.13 (10.93) | 30 | 78.27 (10.25) | 26 | 77.19 (10.61) | |
| PP | Active | 30 | 45.20 (11.71) | 30 | 44.47 (12.11) | 28 | 43.61 (12.25) |
| Sham | 30 | 41.43 (10.84) | 30 | 41.10 (10.69) | 26 | 39.96 (11.75) | |
| RR | Active | 30 | 13.75 (2.41) | 30 | 12.83 (2.36) | 28 | 13.49 (1.72) |
| Sham | 30 | 13.31 (2.49) | 30 | 13.30 (2.83) | 26 | 13.91 (1.67) | |
| RR interval | Active | 30 | 759.43 (131.98) | 30 | 788.44 (176.73) | 28 | 725.36 (152.94) |
| Sham | 30 | 702.83 (160.73) | 30 | 743.67 (139.31) | 26 | 714.98 (76.73) | |
| Var (total HRV) | Active | 30 | 6.44 (2.33) | 30 | 6.57 (1.30) | 28 | 6.09 (1.34) |
| Sham | 30 | 6.29 (1.59) | 30 | 6.67 (1.71) | 26 | 6.19 (1.45) | |
| VLF | Active | 30 | 5.32 (1.30) | 30 | 5.48 (1.30) | 28 | 5.05 (1.34) |
| Sham | 30 | 5.36 (1.73) | 30 | 5.48 (1.78) | 26 | 5.05 (1.32) | |
| LF | Active | 30 | 4.44 (1.70) | 30 | 4.86 (1.76) | 28 | 4.40 (1.64) |
| Sham | 30 | 4.62 (1.83) | 30 | 4.91 (2.11) | 26 | 4.14 (1.96) | |
| HF | Active | 30 | 3.88 (1.36) | 30 | 4.52 (1.67) | 28 | 3.84 (1.46) |
| Sham | 30 | 4.10 (2.03) | 30 | 4.66 (1.89) | 26 | 3.75 (1.46) | |
| LF/HF ratio | Active | 30 | 0.57 (1.17) | 30 | 0.34 (0.85) | 28 | 0.56 (1.17) |
| Sham | 30 | 0.52 (1.16) | 30 | 0.25 (1.07) | 26 | 0.39 (1.39) |
Abbreviations: DBP, diastolic blood pressure (mmHg); HF, high-frequency power (ln[ms2]); LF, low-frequency power (ln[ms2]); PP, pulse pressure (mmHg); RR interval, time elapsing between 2 consecutive R waves in electrocardiogram (ms); Var, total variance (ln[ms2]); RR, respiratory rate (breaths per minute); SBP, systolic blood pressure (mmHg); tDCS, transcranial direct current stimulation; VLF, very low-frequency power (ln[ms2]).