title: Measurement of Human Heart Rate during Usual Activty.
abstract: A small, rugged, self-contained cumulative heart-beat counter has a transistorized amplifier, a watch movement made into a counter, and a battery. The counter is activated by each R-wave of the electrocardiographic complex obtained from newly designed precordial electrodes. Heart beats can be counted for as long as 24 hours.
authors.forename: D A
authors.initials: DA
authors.lastname: Rowley
authors.forename: S
authors.initials: S
authors.lastname: Glagov
authors.forename: P
authors.initials: P
authors.lastname: Stoner