SDNN/RMSSD as a Surrogate for LF/HF: A Revised Investigation

Table 1

HRV measurements of one subject.

	01–04	04–07	07–10	10–13	13–16	16–19
			Week 1
MH	78	75	74	74	78	79
MR	772	802	814	807	768	761
SD	99	79	92	107	108	105
RM	46	37	46	47	47	48
S/R	2.2	2.1	2.0	2.3	2.3	2.2
LF	1731.2	1383.5	2087.4	1991.2	2335.9	3131.6
HF	229.1	193.3	317.0	436.9	409.7	511.8
L/H	7.6	7.2	6.6	4.6	5.7	6.1
			Week 2
MH	95	95	98	97	99	96
MR	631	629	613	618	604	628
SD	54	50	49	47	56	70
RM	34	28	24	25	23	32
S/R	1.6	1.8	2.0	1.9	2.4	2.2
LF	937.9	1149.5	704.6	548.6	752.6	787.4
HF	131.3	155.6	192.5	202.9	101.4	161.9
L/H	7.1	7.4	3.7	2.7	7.4	4.9
			Week 3
MH	102	102	99	99	95	100
MR	588	590	605	609	630	598
SD	46	51	48	49	53	54
RM	17	20	19	21	25	20
S/R	2.7	2.6	2.5	2.3	2.1	2.7
LF	472.8	630.6	342.2	499.0	709.0	623.7
HF	58.3	121.0	110.1	198.3	141.3	106.9
L/H	8.1	5.2	3.1	2.5	5.0	5.8
			Week 4
MH	83	88	88	85	78	77
MR	719	680	685	705	766	775
SD	93	65	85	83	107	90
RM	43	31	40	37	45	44
S/R	2.2	2.1	2.1	2.2	2.4	2.0
LF	2022.5	587.9	1601.3	1650.0	2215.5	1268.7
HF	296.2	219.7	247.1	374.5	381.6	325.9
L/H	6.8	2.7	6.5	4.4	5.8	3.9
			Week 5
MH	77	75	78	76	74	72
MR	777	806	766	786	813	830
SD	97	90	85	105	95	102
RM	47	52	48	61	50	64
S/R	2.1	1.7	1.8	1.7	1.9	1.6
LF	1924.5	1300.2	936.2	2771.7	1988.1	2188.6
HF	339.7	333.7	353.1	889.7	356.7	940.5
L/H	5.7	3.9	2.7	3.1	5.6	2.3
			Week 6
MH	93	90	86	90	85	82
MR	643	671	700	668	705	731
SD	54	66	101	76	93	97
RM	28	37	50	38	48	55
S/R	1.9	1.8	2.0	2.0	1.9	1.8
LF	833.0	1392.1	2269.1	1842.2	1356.6	1736.3
HF	193.3	300.5	372.3	217.3	579.0	601.2
L/H	4.3	4.6	6.1	8.5	2.3	2.9

MH: mean heart rate (/m), MR: mean RR intervals (ms), SD: standard deviation of normal to normal RR intervals, RM: root mean square of normal to normal RR intervals, S/R: ratio of SDNN and RMSSD, LF: low-frequency power (ms²), HF: high-frequency power (ms²), L/H: ratio of LF and HF, 01–04: epoch from 1 minute to 4 minute within the time sequence.