Heart Rate Variability Measurement Using Artificial Beat Interpolation
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Solution Overview
Problem
Errors and inaccuracies in heart rate variability measurement results due to unsuitable heartbeats can significantly distort the frequency spectrum, preventing accurate determination of heart rate variability.
Innovation Solution
Unsuitable heartbeats are identified and replaced with artificial heartbeats based on the temporal arrangement of surrounding heartbeats, ensuring the frequency spectrum is not influenced by errors, and the measurement result is corrected before Fourier transformation, using methods like interpolation and resampling to maintain physiological accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If unsuitable heartbeats are removed from the measurement result, then measurement precision is improved, but loss of information occurs due to deletion of data points
Solution Approach 1:
The patent creates artificial heartbeats that replicate the temporal characteristics of missing heartbeats. These artificial heartbeats are generated by interpolating the intervals between surrounding suitable heartbeats, effectively copying the expected pattern of what the removed heartbeat should have been, thus preserving information while eliminating erroneous data
Solution Approach 2:
The patent prepares artificial heartbeats in advance to compensate for the removal of unsuitable heartbeats. By calculating and inserting these compensatory artificial heartbeats before the Fourier transform analysis, the method cushions against the information loss that would otherwise occur from simply deleting erroneous data points
2Measurement precision
If artificial heartbeats are inserted to replace unsuitable heartbeats, then measurement precision is improved, but device complexity increases due to additional processing steps
Solution Approach 1:
The patent performs the identification and replacement of unsuitable heartbeats with artificial ones in a preliminary step before the main Fourier transform analysis. This preliminary action prepares the measurement result in advance, ensuring that only suitable data points are analyzed while maintaining the temporal structure, thus improving precision without adding complexity to the main analysis routine
Solution Approach 2:
The patent changes the temporal parameters of the measurement result by adjusting the intervals between heartbeats when inserting artificial heartbeats. By modifying these time parameters to match the expected physiological patterns, the method improves measurement accuracy while using straightforward parameter adjustment rather than complex algorithms
Data Source
Figure 1
AI summary
A measuring device such as ECG unit (1) is used to measure the heartbeats of a person (P) and the intervals between the heartbeats as a function of time. The intervals between the heartbeats are analyzed using Fast Fourier Transform (FFT) and a frequency spectrum is generated. A check of certain intervals is performed and the measurement result is processed in dependence on a result of the test, prior to the analysis through FFT. At least four intervals between heartbeats are interpolated according to the unsuitable heartbeat. An independent claim is included for a device for determining the heart rate variability of an organism, particularly a human.