Voluntary cardio-respiratory synchronization: Hardware and software development and evaluation

R. P. Patterson, H. A. Belalcazar, L. I. Mason, Y. Pu

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


Voluntary cardio-respiratory synchronization (VCRS) is a technique where an individual's breathing is voluntarily phase locked with his/her heart beat. A signal is generated (tone or light) from the ECG that is used to pace the breath with a fixed number of heart beats for inspiration and expiration. A small portable device was developed that can create a tone to pace the breathing and record the data for repeated measurements for extended periods of time (days or weeks). The device was tested on an individual over a four-week period. Measurements of heart rate variability were made at various times throughout the day for a total of 68 recordings. The data were analyzed to separate out respiratory and non-respiratory induced changes in the heart rate using a unique time domain analysis. The results showed significant variability over the measurement period.

Original languageEnglish (US)
Pages (from-to)3400-3402
Number of pages3
JournalAnnual Reports of the Research Reactor Institute, Kyoto University
StatePublished - Dec 1 2001


  • Breathing
  • Heart rate variability
  • VCRS


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