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Entropy 2017, 19(9), 460; https://doi.org/10.3390/e19090460

Influence of Parameter Selection in Fixed Sample Entropy of Surface Diaphragm Electromyography for Estimating Respiratory Activity

1,2,3
,
1,2,3
,
1,2,3
and
1,2,3,*
1
Biomedical Signal Processing and Interpretation, Institute for Bioengineering of Catalonia (IBEC), The Barcelona Institute of Science and Technology, Baldiri Reixac 10-12, 08028 Barcelona, Spain
2
Department of Automatic Control (ESAII), Universitat Politècnica de Catalunya (UPC)—Barcelona Tech, 08028 Barcelona, Spain
3
Biomedical Research Networking Center in Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), 08028 Barcelona, Spain
*
Author to whom correspondence should be addressed.
Received: 17 May 2017 / Revised: 1 August 2017 / Accepted: 29 August 2017 / Published: 1 September 2017
(This article belongs to the Special Issue Entropy and Sleep Disorders)
Full-Text   |   PDF [5429 KB, uploaded 1 September 2017]   |  

Abstract

Fixed sample entropy (fSampEn) is a robust technique that allows the evaluation of inspiratory effort in diaphragm electromyography (EMGdi) signals, and has potential utility in sleep studies. To appropriately estimate respiratory effort, fSampEn requires the adjustment of several parameters. The aims of the present study were to evaluate the influence of the embedding dimension m, the tolerance value r, the size of the moving window, and the sampling frequency, and to establish recommendations for estimating the respiratory activity when using the fSampEn on surface EMGdi recorded for different inspiratory efforts. Values of m equal to 1 and r ranging from 0.1 to 0.64, and m equal to 2 and r ranging from 0.13 to 0.45, were found to be suitable for evaluating respiratory activity. fSampEn was less affected by window size than classical amplitude parameters. Finally, variations in sampling frequency could influence fSampEn results. In conclusion, the findings suggest the potential utility of fSampEn for estimating muscle respiratory effort in further sleep studies. View Full-Text
Keywords: surface diaphragm electromyography; fixed sample entropy (fSampEn); respiratory activity; respiratory effort; non-invasive respiratory monitoring surface diaphragm electromyography; fixed sample entropy (fSampEn); respiratory activity; respiratory effort; non-invasive respiratory monitoring
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Estrada, L.; Torres, A.; Sarlabous, L.; Jané, R. Influence of Parameter Selection in Fixed Sample Entropy of Surface Diaphragm Electromyography for Estimating Respiratory Activity. Entropy 2017, 19, 460.

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