Abstract
A radiotelemeter was produced tentatively for electrocardiography (ECG). Its constitution was outlined. Experiments were conducted to make its actual adaptation possible by demonstrating its utility. The results obtained are summarized as follows. 1) The radio transmitter is a portable device, battery-operated and all transistorized. The signal is broadcast by frequency modulation on a 27.2Mc/s signal carrier with a reach of approximately 100 meters. The receiver is of super heterodyne system, relaying the ECG signal simultaneously to a conventional electrocardiograph and to an inkwriting oscillograph. 2) The electrode is a silver plate attached to a rubber cap. It is adhered to the skin with ad adhesive agent with precaution not to be dislocated by perspiration. 3) This apparatus was used to monitor human subjects in mark time, ordinary walk, stationary running action, actual fast running and hurdling, horses and riders on horseback in exercise, and horses with riders in various gaits. It gave technically satisfactory ECGs at all times, except in strenuous exertion. This apparatus was considered to be of use in functional investigation of cardiac activity, clinical diagnosis of cardiac ailment, and physiological study of locomotion.
