Author

Naoya Morikawa

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Open access Oct 2026

Inter-Lead RRI Agreement Between Lead I and Lead II Across Diagnostic ECG Categories: Pilot Evidence for Wearable HRV Monitoring

Background: Wearable electrocardiogram (ECG) devices capable of recording a single-lead signal—typically Lead I—have proliferated rapidly, enabling long-term ambulatory cardiac monitoring outside clinical settings. However, the extent to which Lead I-derived heart rate variability (HRV) metrics are concordant with thos...

Naoya Morikawa, Emi Yuda · Applied Sciences · 0 citations

Open access Aug 2026

HRV-Based Respiratory-Rate Estimation in Older Adults: Error Modeling and Pilot Validation for Wearable Sleep Monitoring

The HF-peak method is reliable when SNR is high and breathing is regular but requires additional quality criteria beyond SNR alone in older adult populations where non-respiratory HF oscillations may confound spectral peak detection.

Emi Yuda, Naoya Morikawa, J. Hayano · Clocks & Sleep · 0 citations