An indirect contact ECG measurement method successfully obtained signals for HRV assessment during sleep, though signal quality was lower and motion artifacts larger than direct-contact ECG.
Does an indirect contact ECG measurement method on a bed provide adequate signal quality for monitoring compared to direct-contact ECG?
A novel indirect-contact ECG system embedded in a mattress can successfully monitor heart rate variability during sleep without direct skin contact, despite lower signal quality than conventional ECG.
A new indirect contact (IDC) electrocardiogram (ECG) measurement method (IDC-ECG) for monitoring ECG during sleep that is adequate for long-term use is provided. The provided method did not require any direct conductive contact between the instrument and bare skin. This method utilizes an array of high-input-impedance active electrodes fixed on the mattress and an indirect-skin-contact ground made of a large conductive textile sheet. A thin cotton bedcover covered the mattress, electrodes, and conductive textile, and the participants were positioned on the mattress over the bedcover. An ECG was successfully obtained, although the signal quality was lower and the motion artifact was larger than in conventional direct-contact measurements (DC-ECG). The results showed that further studies are required to apply the provided method to an ECG diagnosis of cardiovascular diseases. However, currently the method can be used for HRV assessment with easy discrimination of R-peaks.
Lim et al. (Wed,) conducted a other in ECG monitoring during sleep. Indirect contact (IDC) electrocardiogram (ECG) measurement method vs. Conventional direct-contact measurements (DC-ECG) was evaluated on ECG signal acquisition and quality. An indirect contact ECG measurement method successfully obtained signals for HRV assessment during sleep, though signal quality was lower and motion artifacts larger than direct-contact ECG.