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Respiratory Signal Derived from the Smartphone Built-in Accelerometer during a Respiratory Load Protocol

文献类型： 会议论文

第一作者： Luis Estrada

作者： Luis Estrada 1 ; Abel Torres 1 ; Leonardo Sarlabous 2 ; Raimon Jané 1 ;

作者机构： 1.the Universitat Politècnica de Catalunya (UPC), the Institut de Bioenginyeria de Catalunya (IBEC) and the Biomedical Research Networking Center in Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), c/. Baldiri Reixac 4, 08028, Barcelona, Spain

2.the CIBER-BBN and the IBEC

关键词： built-in accelerometer;respiratory monitoring;respiratory rate estimated

会议名称： Annual International Conference of the IEEE Engineering in Medicine and Biology Society

主办单位：

页码： 6768-6771

摘要： The scope of our work focuses on investigating the potential use of the built-in accelerometer of the smartphones for the recording of the respiratory activity and deriving the respiratory rate. Five healthy subjects performed an inspiratory load protocol. The excursion of the right chest was recorded using the built-in triaxial accelerometer of a smartphone along the x, y and z axes and with an external uniaxial accelerometer. Simultaneously, the respiratory airflow and the inspiratory mouth pressure were recorded, as reference respiratory signals. The chest acceleration signal recorded in the z axis with the smartphone was denoised using a scheme based on the ensemble empirical mode decomposition, a noise data assisted method which decomposes nonstationary and nonlinear signals into intrinsic mode functions. To distinguish noisy oscillatory modes from the relevant modes we use the detrended fluctuation analysis. We reported a very strong correlation between the acceleration of the z axis of the smartphone and the reference accelerometer across the inspiratory load protocol (from 0.80 to 0.97). Furthermore, the evaluation of the respiratory rate showed a very strong correlation (0.98). A good agreement was observed between the respiratory rate estimated with the chest acceleration signal from the z axis of the smartphone and with the respiratory airflow signal: Bland-Altman limits of agreement between -1.44 and 1.46 breaths per minute with a mean bias of -0.01 breaths per minute. This preliminary study provides a valuable insight into the use of the smartphone and its built-in accelerometer for respiratory monitoring.

分类号： Q81-53

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