IEEE J Biomed Health Inform - Sleep and wake classification with actigraphy and respiratory effort using dynamic warping.

Tópicos

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Resumo

This paper proposes the use of dynamic warping (DW) methods for improving automatic sleep and wake classification using actigraphy and respiratory effort. DW is an algorithm that finds an optimal nonlinear alignment between two series allowing scaling and shifting. It is widely used to quantify (dis)similarity between two series. To compare the respiratory effort between sleep and wake states by means of (dis)similarity, we constructed two novel features based on DW. For a given epoch of a respiratory effort recording, the features search for the optimally aligned epoch within the same recording in time and frequency domain. This is expected to yield a high (or low) similarity score when this epoch is sleep (or wake). Since the comparison occurs throughout the entire-night recording of a subject, it may reduce the effects of within- and between-subject variations of the respiratory effort, and thus help discriminate between sleep and wake states. The DW-based features were evaluated using a linear discriminant classifier on a dataset of 15 healthy subjects. Results show that the DW-based features can provide a Cohen's Kappa coefficient of agreement = 0.59 which is significantly higher than the existing respiratory-based features and is comparable to actigraphy. After combining the actigraphy and the DW-based features, the classifier achieved a of 0.66 and an overall accuracy of 95.7%, outperforming an earlier actigraphy- and respiratory-based feature set ( = 0.62). The results are also comparable with those obtained using an actigraphy- and cardiorespiratory-based feature set but have the important advantage that they do not require an ECG signal to be recorded.

Resumo Limpo

paper propos use dynam warp dw method improv automat sleep wake classif use actigraphi respiratori effort dw algorithm find optim nonlinear align two seri allow scale shift wide use quantifi dissimilar two seri compar respiratori effort sleep wake state mean dissimilar construct two novel featur base dw given epoch respiratori effort record featur search optim align epoch within record time frequenc domain expect yield high low similar score epoch sleep wake sinc comparison occur throughout entirenight record subject may reduc effect within betweensubject variat respiratori effort thus help discrimin sleep wake state dwbase featur evalu use linear discrimin classifi dataset healthi subject result show dwbase featur can provid cohen kappa coeffici agreement signific higher exist respiratorybas featur compar actigraphi combin actigraphi dwbase featur classifi achiev overal accuraci outperform earlier actigraphi respiratorybas featur set result also compar obtain use actigraphi cardiorespiratorybas featur set import advantag requir ecg signal record

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