A compact ECG R-R interval, respiration and activity recording system
Yoshimura, T.; Yonezawa, Y.; Maki, H.; Ogawa, H.; Hahn, A.W.; Thayer, J.F.; Caldwell, W.M.
Biomedical Sciences Instrumentation 39: 204-207
2003
ISSN/ISBN: 0067-8856 PMID: 12724895 Document Number: 556445
An ECG R-R interval, respiration and activity recording system has been developed for monitoring variability of heart rate and respiratory frequency during daily life. The recording system employs a variable gain instrumentation amplifier, an accelerometer, a low power 8-bit single-chip microcomputer and a 1024 KB EEPROM. It is constructed on three ECG chest electrodes. The R-R interval and respiration are detected from the ECG. Activity during walking and running is calculated from an accelerator. The detected data are stored in an EEPROM and after recording, are downloaded to a desktop computer for analysis.