Increase of Short-Term Heart Rate Variability Induced by Blood Pressure Measurements during Ambulatory Blood Pressure Monitoring
Table 1
Mean values ± standard deviation of Mean NN (MNN) and HRV parameters before (B), during (M), and after (A) blood pressure measurements. Normalized values represent the correction with heart rate (SDNN/MNN and rMSSD/MNN). The values are the results of one-way ANOVA tests; significant differences are written in italic; values marked with refer to normalized parameters.
2-Minute interval
Mean NN (msec)
value
SDNN (msec) Normalized (%)
value
rMSSD (msec) Normalized (%)
value
24 hours
B
869 ± 143
0.360
35.68 ± 23.76
<10−6 <
22.52 ± 15.24
0.083
4.11 ± 2.65
2.59 ± 1.75
M
874 ± 140
39.47 ± 27.04
23.53 ± 16.40
4.52 ± 3.10
2.69 ± 1.88
A
868 ± 143
35.85 ± 23.98
22.35 ± 15.51
4.13 ± 2.76
2.58 ± 1.79
Daytime (06:00–22:00)
B
834 ± 136
0.173
33.98 ± 21.60
0.0011 0.0044
19.93 ± 13.25
0.165
4.08 ± 2.59
2.39 ± 1.59
M
841 ± 133
36.46 ± 23.51
20.83 ± 13.95
4.34 ± 2.80
2.48 ± 1.66
A
832 ± 136
33.71 ± 21.26
19.83 ± 13.49
4.05 ± 2.55
2.38 ± 1.62
Nighttime (22:00–06:00)
B
940 ± 130
0.976
39.14 ± 26.03
10−4 <
28.12 ± 18.64
0.417
4.16 ± 2.77
2.99 ± 1.98
M
939 ± 130
45.80 ± 33.74
29.33 ± 20.54
4.88 ± 3.59
3.12 ± 2.19
A
938 ± 131
40.29 ± 29.41
27.79 ± 19.01
4.29 ± 3.13
2.96 ± 2.03
B, 2-minute interval ending when the blood pressure measurement begins; M, 2-minute interval starting when the blood pressure measurement begins; A, 2-minute interval starting two minutes after the moment when the blood pressure measurement begins.
