Monitoring physiological signals using nonintrusive sensors installed in daily life equipment

Lim, Yong Gyu; Hong, Ki Hwan; Kim, Ko Keun; Shin, Jaehyun; Lee, Seung Min; Chung, Gih Sung; Baek, Hyun Jae; Jeong, Do-Un; Park, Kwang Suk

doi:10.1007/s13534-011-0012-0

Cited by 71 publications

(33 citation statements)

References 40 publications

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“…Sinabro can be extended to incorporate other wearable sensors and sensors integrated with household equipment, such as a chair or a bed [11], to increase sensing opportunities. For example, Sinabro can incorporate a bed-embedded ECG sensor and exploit expanded opportunities.…”

Section: Augmenting Contextual Informationmentioning

confidence: 99%

Sinabro

Kang

Kwon

Yoo

et al. 2014

Proceedings of the 15th Workshop on Mobile Computing Systems and Applications

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In this paper, we propose Sinabro, an opportunistic and unobtrusive mobile electrocardiogram (ECG) monitoring system that monitors the user's ECG opportunistically during daily smartphone use. Daily ECG monitoring will open up an unprecedented opportunity for pervasive healthcare applications. It will enable the daily detection and prevention of heart problems and also allow inferences about stress, emotion, and even sleep quality. Despite its huge potential, daily ECG monitoring still has not become reality due to its obtrusiveness. In this paper, we first study the potential opportunity to capture ECGs from daily use of smartphones, without requiring the user's explicit attention. Based on such an opportunity, we present a prototype ECG sensor that allows neat integration with a smartphone and the Sinabro system to provide ECG-related physiological status. We show the basic feasibility of our approach, based on daily smartphone usage through phone usage analysis and prototype-based experiments.

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Section: Augmenting Contextual Informationmentioning

confidence: 99%

Sinabro

Kang

Kwon

Yoo

et al. 2014

Proceedings of the 15th Workshop on Mobile Computing Systems and Applications

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“…Finally, we plan to develop a perfectly nonconstrained and automatic SOL estimation system using an ECG recorded nonintrusively using capacitively coupled electrodes on a bed [21].…”

Section: Future Workmentioning

confidence: 99%

Estimation of Sleep Onset Latency Based on the Blood Pressure Regulatory Reflex Mechanism

Jung

Hwang

Chung

et al. 2013

IEEE J. Biomed. Health Inform.

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Sleep onset latency (SOL) is an objective indicator of sleepiness and is being used clinically as a diagnostic tool for sleep deprivation. This study proposes a new and less intrusive approach to estimate SOL based on the blood pressure (BP) regulatory reflex mechanism.We hypothesized that the arterial baroreflex, one kind of reflex mechanism for BP regulation, maintains the toning-down effect sleep has on BP. The arterial baroreflex is strongly activated after the time of sleep onset in order to maintain the lowered BP by leading to an increase in heart beat interval (HBI). This observation suggests that the arterial baroreflex has a marked influence on the HBI control with the onset of sleep. As a result, a positive correlation is expected between fluctuations of BP and those of subsequent HBI after sleep onset. To investigate our hypothesis, we determined the relationship between BP and HBI using the R-J and R-R intervals measured from an electrocardiogram and a ballistocardiogram.We estimated SOL using the correlation coefficients corresponding to the relationship between fluctuations of the R-J interval and those of the subsequent R-R interval. The SOLs of ten healthy subjects [age (mean ± SD): 28.72 ± 3.21 years] were estimated using our proposed method and compared with the polysomnography data. The mean absolute error was 0.25 ± 0.35 min, corresponding to a half epoch (15 s) on average. We expect our method will be applicable as a nonintrusive and automatic SOL estimation system that does not require the use of electroencephalogram sensors.

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“…Impedance between the scalp and the surface of the capacitive electrode Z HAIR is high compared with that of conventional direct contact electrodes because of the insulating effect of hair. Equations (1) and (3) indicate that in order to measure the signal using capacitance, we should increase the resistance R B and reduce the electrode impedance Z HAIR ; resistances from hundreds of gigaohms to teraohms are now easily available. In order to reduce the electrode's impedance, we should maximize its coupling capacitance.…”

Section: A Capacitively Coupled Eeg Electrodementioning

confidence: 99%

Conductive Polymer Foam Surface Improves the Performance of a Capacitive EEG Electrode

Baek

Lee

Lim

et al. 2012

IEEE Trans. Biomed. Eng.

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In this paper, a new conductive polymer foam-surfaced electrode was proposed for use as a capacitive EEG electrode for nonintrusive EEG measurements in out-of-hospital environments. The current capacitive electrode has a rigid surface that produces an undefined contact area due to its stiffness, which renders it unable to conform to head curvature and locally isolates hairs between the electrode surface and scalp skin, making EEG measurement through hair difficult. In order to overcome this issue, a conductive polymer foam was applied to the capacitive electrode surface to provide a cushioning effect. This enabled EEG measurement through hair without any conductive contact with bare scalp skin. Experimental results showed that the new electrode provided lower electrode-skin impedance and higher voltage gains, signal-to-noise ratios, signal-to-error ratios, and correlation coefficients between EEGs measured by capacitive and conventional resistive methods compared to a conventional capacitive electrode. In addition, the new electrode could measure EEG signals, while the conventional capacitive electrode could not. We expect that the new electrode presented here can be easily installed in a hat or helmet to create a nonintrusive wearable EEG apparatus that does not make users look strange for real-world EEG applications.

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Monitoring physiological signals using nonintrusive sensors installed in daily life equipment

Cited by 71 publications

References 40 publications

Sinabro

Sinabro

Estimation of Sleep Onset Latency Based on the Blood Pressure Regulatory Reflex Mechanism

Conductive Polymer Foam Surface Improves the Performance of a Capacitive EEG Electrode

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