Abstract: A digital stop watch is provided in combination with a cardiac monitor wherein both the stop watch means and the cardiac monitor utilize a common display means and wherein the combination is adapted to be worn around the wrist. The stop watch is of conventional construction, comprising a clock which drives a counter and multiplexing means disposed between the counter and display means for selectively displaying the count in the counter. The cardiac monitor comprises a transducer worn on the body and adapted to produce an electrical pulse in response to each heart beat of the wearer. The transducer output is fed into a rate logic circuit which generates a heart beat rate signal representative of the pulse rate of the wearer and the rate signal is stored in a temporary memory which is continuously and periodically updated.

Abstract: A cardiac monitor comprises a transducer worn on the body and adapted to produce an electrical pulse in response to each heart beat of the wearer. The transducer output is fed into a rate logic circuit which generates a heart beat rate signal representative of the pulse rate of the wearer and the rate signal is stored in a temporary memory which is continuously and periodically updated. The output from the temporary heart beat memory is fed into the multiplexer so that both the wearer's pulse rate and the elapsed time of the stop watch may be alternatively displayed on the common display means by manually activating the multiplexer. In the preferred form of the invention, a pair of separated pulse rate values are preset by the user and are then stored in the cardiac monitor so that an indicator is activated when the pulse rate exceeds one of the rate values or drops below the other rate value.