Microprocessor-Based Memory Device for Ambulatory Heart Rate and Physical Activity Recording

Abstract:

Using microprocessor techniques, a portable digital memory device has been designed for the ambulatory monitoring of heart rate and physical activity. The device consists of a microprocessor, an ECG amplifier to record the heart rate and an accelerometerto detect the physical activity. This accelerometer is piezoresistive and is suitable for ambulatory physical activity recording, because this sensor requires low electrical power, has high durability and wide frequency response (DC~1.2 kHz). Changes in hearti rates and physical activity in daily life have been successfully recorded.

Keywords

Ambulatory Monitoring - Microprocessor - Heart Rate - Physical Activity

• REFERENCES

• 1 Stokkel LA, Klinkenberg-Knol EX, Breedijk M. Microcomputer system for long-term ambulatory pH recording. Med Biol Eng Corn-put 1987; 25: 107-9.
• 2 Kawarada A, Shimazu H, Yamakoshi K. Ambulatory monitoring of indirect beat-to-beat arterial pressure in human fingers by a volume-compensation method. Med Biol Eng Comput 1991; 29: 55-62.
• 3 Friedmann P, Adam D. Portable system for acquisition and transmission of ECG parameters. Med Biol Eng Comput 1992; 30: 57-62.
• 4 Makikawa M, Nakatani TakenakaY. et al. Development of the portable biological information recording and analyzing system and its clinical application. In: Biomechanism 8. Tokyo: Tokyo Univ Press; 1986: 236-47.
• 5 Makikawa M, Nakatani Y, Schichikawa K, Horio H, Hasegawa T. Development of a portable computerized disease condition memory system and its clinical application to record the RA patient’s disease condition. Japan J Med Electron Biol Eng 1986; 24: 86-91.
• 6 Makikawa M, Nakatani Y, Schichikawa K, Horio H, Hasegawa T. Development of a portable computerized gait analysis system and measurement of the force distribution under the foot in various modes of walking. Japan J Med Electron Biol Eng 1986; 24: 169-74.