Why the study?
Do time-domain indexes (sd/rmssd and sd2/sd1) perform comparably to the LF/HF ratio in short-term HRV analysis during a tilt test in healthy subjects?
Do time-domain indexes (sd/rmssd and sd2/sd1) perform comparably to the LF/HF ratio in short-term HRV analysis during a tilt test in healthy subjects?
Time-domain indexes sd/rmssd and sd2/sd1 offer a simple, assumption-free alternative to the LF/HF ratio for short-term heart rate variability analysis.
Time-domain HRV indexes may simplify tilt-test analysis versus LF/HF; hypothesis-generating and requires prospective validation before clinical use.
In the context of HRV analysis, we evaluated the information content of two measures that can easily be derived from the classical RR time-domain indexes. The two measures are: 1) the ratio sd/rmssd, where sd is the RR standard deviation and rmssd is the root mean square of squared differences of consecutive RR beats; and 2) the ratio sd2/sd1, where sd2 and sd1 are extracted from the Poincaré plot and represent the transversal and longitudinal dispersion of the cloud of points (RR(i),RR(i)(+1)). We compared the performance of the two measures with that of the classical LF/HF ratio in a group of healthy subjects who underwent a 70 degrees upright tilt test. The goodness of the results obtained by the two measures, the simplicity of their calculation and their applicability free from a priori assumptions on the characteristics of the data are proposed to the attention of the community involved in the HRV analysis as a possible alternative to the LF/HF ratio.
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Balocchi et al. (2006) studied this question.
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