Correlation between Palpitations below the Heart in Traditional Chinese Medicine and Autonomic Nerve Function Based on Heart Rate Variability: A Case-Control Study

Table 4

HRV indexes of different groups in different periods of day and night.

		Day time			Nighttime
		Normal group	Palpitations below the heart group		Normal group	Palpitations below the heart group
Time domain indexes	SDNN	99.25 ± 19.54	103.50 (89.25, 114.50)	0.390	148.13 ± 15.36	158.38 ± 46.10	0.430
	RMSSD	23.50 (22.00, 30.50)	33.19 ± 8.18	0.042	49.25 ± 11.40	54.81 ± 19.42	0.465
	pNN50	4.00 (3.00, 9.50)	11.63 ± 5.93	0.027	24.38 ± 9.18	30.44 ± 14.17	0.286
Frequency domain indexes	TP	1940.03 ± 411.77	1945.62 ± 406.98	0.975	2892.81 ± 798.83	2366.20 (1826.23, 3261.98)	0.462
	LF	622.01 ± 194.71	548.48 ± 115.21	0.349	845.28 ± 326.74	575.30 (431.90, 770.00)	0.298
	HF	147.85 (110.98, 209.18)	221.85 (175.25, 408.78)	0.076	652.93 ± 327.21	602.50 (364.30, 1465.45)	0.806
	LF/HF	3.87 ± 1.60	2.38 ± 1.26	0.021	1.59 ± 0.93	1.05 (0.62, 1.26)	0.198