Heart Rate Variability Analysis of Human Volunteers under Noncontact, Noninvasive and Clothed Condition Using Microwave Reflectometry : Feasibility Study

• Maruyama Toru

  Faculty of Art and Science, Kyushu University Department of Medicine and Biosystemic Science, Kyushu University School of Medical Sciences

• Yasuda Shioto

  Department of Medicine and Biosystemic Science, Kyushu University School of Medical Sciences

• Mase Atsushi

  Art, Science and Technology Center for Cooperative Research, Kyushu University

Bibliographic Information

Other Title

• マイクロ波反射計を用いた非接触・無拘束・着衣下での心拍変動解析の試み

Abstract

Heart rate variability (HRV) reflects cardiac autonomic functions including sympathovagal balance, and conventional electrocardiographic (ECG) monitoring (Holter) is a major tool for evaluating HRV. However, conventional ECG requires patients to be tethered to the monitoring devices. We have therefore attempted to develop a noninvasive and noncontact cardiac monitoring system. Our laboratory recentry developed a microwave reflectometry system which senses heart beats and pulse waves. An auto-gain control system, template-matching system, and signal cross-correlation technique obtained by multiple reflectometric sensors enable motion artifact elimination, signal peak detection, and real-time data processing. HRV of healthy volunteers (n=11, mean age of 28.4±12.3 y.o.) was evaluated simultaneously by both conventional ECG and microwave reflectometry under mental arithmetic loading. Frequency-domain HRV parameter of LF/HF obtained by reflectometric analysis showed a good correlation with this parameter obtained by conventional ECG monitoring (r=0.769, y=0.90504 · x, p < 0.001). HRV evaluation using this microwave reflectometry is completely noninvasive and feasible even through thick clothing, though more sophisticated improvements would be needed for this device to be widely used in mobile PC system.

Journal

• Japanese Journal of Electrocardiology

  Japanese Journal of Electrocardiology 35 (2), 133-142, 2015

  Japanese Heart Rhythm Society

Keywords

• Microwave
• Heart rate variability
• Autonomic nerve
• Noncontact monitoring

Details

• CRID: 1390001204772243200
• NII Article ID: 130005139471
• DOI: 10.5105/jse.35.133
• ISSN: 18842437
• ISSN: 02851660
• Web Site: https://www.jstage.jst.go.jp/article/jse/35/2/35_133/_pdf
• Web Site: https://search.jamas.or.jp/link/ui/2016024917
• Text Lang: ja
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed