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Heart Rate Variability Monitoring during Sleep Based on Capacitively Coupled Textile Electrodes on a Bed.

Lee HJ, Hwang SH, Yoon HN, Lee WK, Park KS - Sensors (Basel) (2015)

Bottom Line: The experimental results showed that the mean of R-peak coverage was 98.0% (95.5%-99.7%), and the normalized errors of HRV time and spectral measures between the Ag/AgCl system and our system ranged from 0.15% to 4.20%.The root mean square errors for inter-beat (RR) intervals and HR were 1.36 ms and 0.09 bpm, respectively.We also showed the potential of our developed system for rapid eye movement (REM) sleep and wake detection as well as for recording of abnormal states.

View Article: PubMed Central - PubMed

Affiliation: Interdisciplinary Program for Bioengineering, Graduate School, Seoul National University, Seoul 110-799, Korea. hongjidan@bmsil.snu.ac.kr.

ABSTRACT
In this study, we developed and tested a capacitively coupled electrocardiogram (ECG) measurement system using conductive textiles on a bed, for long-term healthcare monitoring. The system, which was designed to measure ECG in a bed with no constraints of sleep position and posture, included a foam layer to increase the contact region with the curvature of the body and a cover to ensure durability and easy installation. Nine healthy subjects participated in the experiment during polysomnography (PSG), and the heart rate (HR) coverage and heart rate variability (HRV) parameters were analyzed to evaluate the system. The experimental results showed that the mean of R-peak coverage was 98.0% (95.5%-99.7%), and the normalized errors of HRV time and spectral measures between the Ag/AgCl system and our system ranged from 0.15% to 4.20%. The root mean square errors for inter-beat (RR) intervals and HR were 1.36 ms and 0.09 bpm, respectively. We also showed the potential of our developed system for rapid eye movement (REM) sleep and wake detection as well as for recording of abnormal states.

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Sleep stages: (a) HF power and (b) LF/HF ratio from capacitive textile system of subject B during PSG.
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sensors-15-11295-f008: Sleep stages: (a) HF power and (b) LF/HF ratio from capacitive textile system of subject B during PSG.

Mentions: As shown in Table 1 and Table 2, the HRV parameters from our system in the time and frequency domains are guaranteed with low errors, especially in mean HR, LF power, HF power, and VLF power. These are useful clinical measures for detecting hypertension, sudden death or cardiac arrest, myocardial infarction, and diabetes [25]. Moreover, the parameters can also provide information on the stress state of the body as the HRV spectral measures are related to changes in the sympathetic and parasympathetic activity of the autonomic nervous system. In addition, the ECG data from our system can be utilized in sleep analyses through the HRV analyses. Figure 8 shows the sleep stages, HF power, and LF/HF ratio from the capacitively measured ECG of subject B during PSG.


Heart Rate Variability Monitoring during Sleep Based on Capacitively Coupled Textile Electrodes on a Bed.

Lee HJ, Hwang SH, Yoon HN, Lee WK, Park KS - Sensors (Basel) (2015)

Sleep stages: (a) HF power and (b) LF/HF ratio from capacitive textile system of subject B during PSG.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4481948&req=5

sensors-15-11295-f008: Sleep stages: (a) HF power and (b) LF/HF ratio from capacitive textile system of subject B during PSG.
Mentions: As shown in Table 1 and Table 2, the HRV parameters from our system in the time and frequency domains are guaranteed with low errors, especially in mean HR, LF power, HF power, and VLF power. These are useful clinical measures for detecting hypertension, sudden death or cardiac arrest, myocardial infarction, and diabetes [25]. Moreover, the parameters can also provide information on the stress state of the body as the HRV spectral measures are related to changes in the sympathetic and parasympathetic activity of the autonomic nervous system. In addition, the ECG data from our system can be utilized in sleep analyses through the HRV analyses. Figure 8 shows the sleep stages, HF power, and LF/HF ratio from the capacitively measured ECG of subject B during PSG.

Bottom Line: The experimental results showed that the mean of R-peak coverage was 98.0% (95.5%-99.7%), and the normalized errors of HRV time and spectral measures between the Ag/AgCl system and our system ranged from 0.15% to 4.20%.The root mean square errors for inter-beat (RR) intervals and HR were 1.36 ms and 0.09 bpm, respectively.We also showed the potential of our developed system for rapid eye movement (REM) sleep and wake detection as well as for recording of abnormal states.

View Article: PubMed Central - PubMed

Affiliation: Interdisciplinary Program for Bioengineering, Graduate School, Seoul National University, Seoul 110-799, Korea. hongjidan@bmsil.snu.ac.kr.

ABSTRACT
In this study, we developed and tested a capacitively coupled electrocardiogram (ECG) measurement system using conductive textiles on a bed, for long-term healthcare monitoring. The system, which was designed to measure ECG in a bed with no constraints of sleep position and posture, included a foam layer to increase the contact region with the curvature of the body and a cover to ensure durability and easy installation. Nine healthy subjects participated in the experiment during polysomnography (PSG), and the heart rate (HR) coverage and heart rate variability (HRV) parameters were analyzed to evaluate the system. The experimental results showed that the mean of R-peak coverage was 98.0% (95.5%-99.7%), and the normalized errors of HRV time and spectral measures between the Ag/AgCl system and our system ranged from 0.15% to 4.20%. The root mean square errors for inter-beat (RR) intervals and HR were 1.36 ms and 0.09 bpm, respectively. We also showed the potential of our developed system for rapid eye movement (REM) sleep and wake detection as well as for recording of abnormal states.

Show MeSH