Abstract
Intermittent disturbances are common in ECG signals recorded with smart clothing: this is mainly because of displacement of the electrodes over the skin. We evaluated a novel adaptive method for spatio-temporal filtering for heartbeat detection in noisy multi-channel ECGs including short signal interruptions in single channels. Using multi-channel database recordings (12-channel ECGs from 10 healthy subjects), the results showed that multi-channel spatio-temporal filtering outperformed regular independent component analysis. We also recorded seven channels of ECG using a T-shirt with textile electrodes. Ten healthy subjects performed different sequences during a 10-min recording: resting, standing, flexing breast muscles, walking and pushups. Using adaptive multi-channel filtering, the sensitivity and precision was above 97% in nine subjects. Adaptive multi-channel spatio-temporal filtering can be used to detect heartbeats in ECGs with high noise levels. One application is heartbeat detection in noisy ECG recordings obtained by integrated textile electrodes in smart clothing.
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Acknowledgments
The authors acknowledge the technical assistance by Tomas Bäcklund and Urban Edström. We are also grateful for the preliminary analyses performed by Fredrik Ragnarsson. The study was supported by grants from the National Institute for Working Life, Sweden, the Heart Foundation of Northern Sweden, and the Swedish Research Council (grant no. 2003-4833).
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Wiklund, U., Karlsson, M., Östlund, N. et al. Adaptive spatio-temporal filtering of disturbed ECGs: a multi-channel approach to heartbeat detection in smart clothing. Med Bio Eng Comput 45, 515–523 (2007). https://doi.org/10.1007/s11517-007-0183-0
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DOI: https://doi.org/10.1007/s11517-007-0183-0