Table 3 Means and mean differences of all indices of heart rate variability at rest (n = 123)
Intervention (n = 62) | Control (n = 61) | |||
|---|---|---|---|---|
Mean | SD | Mean | SD | |
Mean R-R interval (ms) | ||||
BL | 843 | 129 | 887 | 138 |
1 week | 828 | 107 | 894 | 122 |
2 weeks | 831 | 145 | 882 | 155 |
2 weeks-BL | − 16 | 105 | − 21 | 97 |
Root mean square of successive differences (RMSSD) (ms) | ||||
BL | 27 | 29 | 29 | 21 |
1 week | 24 | 21 | 26 | 21 |
2 weeks | 25 | 28 | 26 | 16 |
2 weeks-BL | − 3 | 16 | − 4 | 18 |
Standard deviation of normal to normal (SDNN) (ms) | ||||
BL | 27 | 18 | 32 | 18 |
1 week | 26 | 15 | 29 | 18 |
2 weeks | 25 | 17 | 29 | 17 |
BL-2 weeks | − 2 | 12 | − 4 | 14 |
Low frequency (LF) (ms2) | ||||
BL | 361 | 475 | 700 | 955 |
1 week | 365 | 498 | 623 | 935 |
2 weeks | 355 | 736 | 616 | 1434 |
BL-2 weeks | − 5 | 455 | − 106 | 1051 |
High frequency (HF) (ms2) | ||||
BL | 329 | 569 | 347 | 449 |
1 week | 304 | 449 | 371 | 535 |
2 weeks | 249 | 292 | 294 | 357 |
BL-2 weeks | − 86 | 475 | − 70 | 445 |
Low frequency/high frequency ratio (LF/HF) | ||||
BL | 2.6 | 4.0 | 2.7 | 2.4 |
1 week | 2.5 | 2.6 | 2.4 | 2.1 |
2 weeks | 3.1 | 4.7 | 2.7 | 3.5 |
BL-2 weeks | 0.5 | 4.9 | 0.2 | 4.0 |
Total power (ms2) | ||||
BL | 741 | 862 | 1133 | 1302 |
1 week | 706 | 722 | 1065 | 1406 |
2 weeks | 628 | 893 | 988 | 1678 |
BL-2 weeks | − 117 | 803 | − 185 | 1351 |