抄録
It is important to record electrocardiogram (ECG) and exercise intensity simultaneously to have patients with ischemic heart disease recognize their safe lifestyle and to have patients with diabetes mellitus and hyperlipemia keep exercise therapy effectively. We have developed an ambulatory 24-hour-recording device of electrocardiogram and exercise intensity as well as the analytic system of the data. This device, put on the waist, was composed of a bimorphic accelerometer to measure intensity, a voltage-frequency converter and a wave-form regulator. The regulator formed a rectangular pulse with a constant pulse width of 0.05 msec so that exercise strength was expressed as frequency change. Outputs from this device were tape-recorded together with electrocardiogram on a 4 channel ambulatory recorder (SM-28, Fukuda Denshi Co. ltd.) and the recordings were analyzed through the use of a 24-hour ECG analyzer (SCM-280, Fukuda Denshi Co. ltd.). Timing signals generated by a clock circuit equipped in the recorder and event marker pulses were recorded on another channel. One channel is open for any information necessary. These data were treated by an analyzer (SCM-280, Fukuda Denshi Co. ltd.) and the output from it were further transmitted to a personal computer (PC-9801, NEC) through an interface (RS-232C). In the computer, exercise intensity, heart rate, ST segment displacement of ECG and recording time are processed at an interval from 10 to 60 seconds which the examiner desires. Graphic expressions about the relationships of heart rate, ST segment displacement of ECG, and exercise intensity on the time table can be displayed on a CRT. The output frequency from the accelerometer recorded while 8 subjects walked on a flat slope treadmill correlated well (r=0.95) with the presumed exercise intensity.
