FilterNIHR function

Artefact filter based in an adaptive threshold

An algorithm that uses adaptive thresholds for rejecting those beats different from the given threshold more than a certain value. The rule for beat acceptation or rejection is to compare with previous, following and with the updated mean. We apply also a comparison with acceptable physiological values (default values 25 and 200 bpm).

FilterNIHR(HRVData, long=50, last=13, minbpm=25, maxbpm=200, mini=NULL, 
                maxi=NULL, fixed=NULL, verbose=NULL)

Arguments

• HRVData: Data structure that stores the beats register and information related to it
• long: Number of beats to calculate the updated mean
• last: Initial threshold
• minbpm: Minimum physiologically acceptable value for HR
• maxbpm: Maximum physiologically acceptable value for HR
• mini: Deprecated argument maintained for compatibility
• maxi: Deprecated argument maintained for compatibility
• fixed: Deprecated argument maintained for compatibility
• verbose: Deprecated argument maintained for compatibility, use SetVerbose() instead

Returns

Returns HRVData, the structure that contains beat positions register, associated heart rate instantaneous values also, and now filtered heart rate signal

References

X. Vila, F. Palacios, J. Presedo, M. Fernandez-Delgado, P. Felix, S. Barro, "Time-Frequency analysis of heart-rate variability," IEEE Eng. Med. Biol. Magazine 16, 119-125 (1997) L. Rodriguez-Linares, A. Mendez, M. Lado, D. Olivieri, X. Vila, I. Gomez-Conde, "An open source tool for heart rate variability spectral analysis", Computer Methods and Programs in Biomedicine 103, 39-50, doi:10.1016/j.cmpb.2010.05.012 (2011)

Author(s)

M. Lado, A. Mendez, D. Olivieri, L. Rodriguez, X. Vila