Key result
Symbolic analysis indexes of heart rate data during the tilt test demonstrated agreement with traditional spectral analysis indexes in normal subjects.
Why the study?
Does symbolic analysis of heart rate data provide comparable information to spectral analysis during the tilt test in normal subjects?
Observational (n=13)
Does symbolic analysis of heart rate data provide comparable information to spectral analysis during the tilt test in normal subjects?
Symbolic analysis of heart rate data provides a valid alternative to spectral analysis for investigating neuroautonomic control during tilt testing.
Answers are grounded in this paper and cite their sources.
Supports symbolic analysis as alternative for tilt-test autonomic assessment; leaves open validation in patients.
Spectral analysis of heart rate sequences is commonly used to investigate neuroauthonomic control of heart rate by means of two indexes, the low and the high frequency power. For tilt test data of normal subjects we compare the spectral indexes with new indexes defined within the framework of symbolic analysis. We define two classes of binary words of length 4: the first class is related to "acceleration" of heart rate and the second class to "stationary behavior." The new indexes measure the change in frequency of the two classes before and after the tilt. Data analysis of 13 normal subjects shows that the behavior of the new indexes is in agreement with that of spectral ones.
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Cammarota et al. (2006) conducted an observational in Normal subjects (n=13). Symbolic analysis indexes vs. Spectral analysis indexes was evaluated on Change in frequency of acceleration and stationary behavior classes before and after tilt. Symbolic analysis indexes of heart rate data during the tilt test demonstrated agreement with traditional spectral analysis indexes in normal subjects.
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