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Table 3 Means and mean differences of all indices of heart rate variability at rest (n = 123)

From: The effect of spinal manipulative therapy and home stretching exercises on heart rate variability in patients with persistent or recurrent neck pain: a randomized controlled trial

  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