Journal of Medical and Biological Engineering

, Volume 39, Issue 1, pp 76–85 | Cite as

Contactless Technique for Measuring Blood-Pressure Variability from One Region in Video Plethysmography

  • Norihiro SugitaEmail author
  • Makoto Yoshizawa
  • Makoto Abe
  • Akira Tanaka
  • Noriyasu Homma
  • Tomoyuki Yambe
Original Article


Sudden changes in blood pressure are frequently caused by daily events such as exercise, stressful work, and moving between different temperature environments. Sometimes, an abrupt change in blood pressure can endanger human lives. To mitigate such a risk, several studies have previously proposed contactless methods for monitoring changes in blood pressure; however, the number of studies on this issue is insufficient. In previous methods, changes in blood pressure were estimated using the propagation time of the pulse waves obtained from two different skin areas on the basis of an analysis of images from video recordings, which is called a video plethysmogram. However, the relative positional relationship of the two skin areas had to be maintained during the measurement, making the approach restrictive. To solve this problem, in the present study, we propose a new method using the video plethysmogram obtained from only one skin area. In particular, the degree of distortion in the video plethysmogram is calculated as a new index to estimate the blood pressure. On the basis of the results of our experiments with 20 healthy human subjects, we ascertain that the proposed index obtained from the palm area is correlated with the blood-pressure variability as well as the previous approach.


Video plethysmogram Contactless Blood pressure Waveform distortion 

JEL Classification




Part of this work was supported by the COI Stream Project founded by Japanese Ministry of Education, Science, Sports and Culture.

Compliance with Ethical Standards

Conflict of interest

The authors declare that there is no conflict of interest.

Ethical Approval

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

Informed Consent

Informed consent was obtained from all individual participants included in the study.


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Copyright information

© Taiwanese Society of Biomedical Engineering 2018

Authors and Affiliations

  1. 1.Graduate School of EngineeringTohoku UniversityMiyagiJapan
  2. 2.Cyberscience CenterTohoku UniversityMiyagiJapan
  3. 3.Faculty of EngineeringShinshu UniversityNaganoJapan
  4. 4.Faculty of Symbiotic Systems ScienceFukushima UniversityFukushimaJapan
  5. 5.Graduate School of MedicineTohoku UniversityMiyagiJapan
  6. 6.Institute of Development, Aging and CancerTohoku UniversityMiyagiJapan

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