Importance

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Abstract

A heart pulse rate measuring system comprises a casing, a pair of rod-shaped grip sensors extending outwardly from the opposite sides of the casing for sensing a heart pulse signal, and an electric circuit for calculating a heart pulse rate from the sensed heart pulse signal. Each of the grip sensors is composed of two conductive cylindrical electrodes arranged in an axially aligned relationship and electrically insulated from each other for obtaining a pulse rate utilizing the potentials at four points in a user's body. The electric circuit includes a differential amplifier, having a ground connection to one of the two electrodes of each sensor and two inputs for the remaining electrodes. A filter is used to eliminate noise from the output of the differential amplifier, and a computer calculates the heart rate from the output of the filter. Additionally, an AC-DC converter is connected between the differential amplifier and the computer for providing a DC signal to the computer when an output is provided by the differential amplifier. The computer responds to a predetermined DC level by starting a display indication of heart pulse rate. A timer is provided for use of the system with an exercise device and an alarm is activated at the expiration of the preset exercise time or if pulse rate deviates beyond upper or lower limits preset therefor. A printer provides a printout of time and/or pulse rate at predetermined time intervals.

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First Claim