Comparison of Heart Rate Variability in Thai Older Adults with Hypertension, Pre-Hypertension, and Normotension

Table 2

BP parameters and HRV index in the study population grouped by BP classification.

	Normal BP (N = 10)	Pre-HT (N = 33)	HT (N = 21)
BP parameters
SBP (mmHg)	113 ± 5.77	128 ± 6.33	153 ± 11.87
DBP (mmHg)	71 ± 4.77	78 ± 5.20	86 ± 8.02
PP (mmHg)	41 (35, 50)	50 (32, 59)	64 (52, 100)
MAP (mmHg)	86 (75.33, 88.67)	86 (86, 108)	91 (86, 125)
Time domain
SDNN (ms)	33.03 ± 10.92	26.97 ± 11.01	18.73 ± 7.36
RMSSD (ms)	34.29 ± 13.92	34.57 ± 33.16	20.89 ± 10.42
pNN50 (%)	16.28 ± 10.74	8.90 ± 10.21	3.98 ± 7.68
Frequency domain
LF power (ms^2)	480.60 ± 395.75	271.67 ± 317.48	107.33 ± 107.50
HF power (ms^2)	517.10 ± 303.00	330.45 ± 249.94	171.38 ± 178.75
LF/HF ratio	1.67 ± 1.95	1.17 ± 1.23	1.25 ± 1.55

Data were presented as the mean ± SD. values were derived using the independent t-test considering participant characteristic differences in each BP group. in the HT group versus the normal BP group. ^# in the HT group versus the pre-HT group. BP, blood pressure; HT, hypertension; systolic blood pressure; DBP, diastolic blood pressure; PP, pulse pressure; MAP, mean arterial pressure; SDNN, standard deviation of NN intervals; RMSSD, root mean square of successive RR interval differences; pNN50, percentage of successive RR intervals that differ by more than 50 ms; LF power, low frequency; HF power, high frequency; LF/HF, ratio of LF-to-HF power.