Database Open Access

MIT-BIH Noise Stress Test Database

George Moody Roger Mark

Published: Aug. 3, 1999. Version: 1.0.0

When using this resource, please cite the original publication:

Moody GB, Muldrow WE, Mark RG. A noise stress test for arrhythmia detectors. Computers in Cardiology 1984; 11:381-384.

Please include the standard citation for PhysioNet: (show more options)
Goldberger, A., Amaral, L., Glass, L., Hausdorff, J., Ivanov, P. C., Mark, R., ... & Stanley, H. E. (2000). PhysioBank, PhysioToolkit, and PhysioNet: Components of a new research resource for complex physiologic signals. Circulation [Online]. 101 (23), pp. e215–e220.


This database includes 12 half-hour ECG recordings and 3 half-hour recordings of noise typical in ambulatory ECG recordings. The noise recordings were made using physically active volunteers and standard ECG recorders, leads, and electrodes; the electrodes were placed on the limbs in positions in which the subjects’ ECGs were not visible.

Data Description

The three noise records were assembled from the recordings by selecting intervals that contained predominantly baseline wander (in record 'bw'), muscle (EMG) artifact (in record 'ma'), and electrode motion artifact (in record 'em'). Electrode motion artifact is generally considered the most troublesome, since it can mimic the appearance of ectopic beats and cannot be removed easily by simple filters, as can noise of other types.

The ECG recordings were created by the script nstdbgen- using two clean recordings (118 and 119) from the MIT-BIH Arrhythmia Database, to which calibrated amounts of noise from record 'em' were added using nst. (The process of making such records is now simpler; the simplified script nstdbgen can be used with current versions of the WFDB software package to recreate these records.) Noise was added beginning after the first 5 minutes of each record, during two-minute segments alternating with two-minute clean segments. The signal-to-noise ratios (SNRs) during the noisy segments of these records are:

Record SNR (dB) Record SNR (dB)
118e24 24 119e24 24
118e18 18 119e18 18
118e12 12 119e12 12
118e06 6 119e06 6
118e00 0 119e00 0
118e_6 -6 119e_6 -6

Since the original ECG recordings are clean, the correct beat annotations are known even when the noise makes the recordings visually unreadable. The reference annotations for these records are simply copies of those for the original clean ECGs.


Access Policy:
Anyone can access the files, as long as they conform to the terms of the specified license.

License (for files):
Open Data Commons Attribution License v1.0


DOI (version 1.0.0):

noise ecg

Corresponding Author
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Total uncompressed size: 67.6 MB.

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Folder Navigation: <base>/old
Name Size Modified
Parent Directory
118_02.dat (download) 2.5 MB 1992-08-01
118_02.hea (download) 144 B 1992-08-01
118_04.dat (download) 2.5 MB 1992-08-01
118_04.hea (download) 144 B 1992-08-01
118_06.dat (download) 2.5 MB 1992-08-01
118_06.hea (download) 143 B 1992-08-01
118_08.dat (download) 2.5 MB 1992-08-01
118_08.hea (download) 144 B 1992-08-01
118_10.dat (download) 2.5 MB 1992-08-01
118_10.hea (download) 143 B 1992-08-01
118_12.dat (download) 2.5 MB 1992-08-01
118_12.hea (download) 142 B 1992-08-01
119_02.dat (download) 2.5 MB 1992-08-01
119_02.hea (download) 142 B 1992-08-01
119_04.dat (download) 2.5 MB 1992-08-01
119_04.hea (download) 142 B 1992-08-01
119_06.dat (download) 2.5 MB 1992-08-01
119_06.hea (download) 142 B 1992-08-01
119_08.dat (download) 2.5 MB 1992-08-01
119_08.hea (download) 144 B 1992-08-01
119_10.dat (download) 2.5 MB 1992-08-01
119_10.hea (download) 143 B 1992-08-01
119_12.dat (download) 2.5 MB 1992-08-01
119_12.hea (download) 143 B 1992-08-01
oldbw.dat (download) 2.5 MB 1992-08-01
oldbw.hea (download) 123 B 1992-08-01
oldem.dat (download) 2.5 MB 1992-08-01
oldem.hea (download) 122 B 1992-08-01
oldma.dat (download) 2.5 MB 1992-08-01
oldma.hea (download) 125 B 1992-08-01
oldnstdb.txt (download) 1.5 KB 1992-08-02