Infrared telemetry for simultaneous recordings of electromyograms

It Is often necessary In the laboratory to realize measurements simultaneously from multiple subjects. We demonstrate here the practical feasibility of an Infrared (IR) transmission of the ECG from six dogs within a dedicated animal room : chronlcal recordings were made continuously to perform toxlco-pharmacological studies. Single channel transmitters using Interval modulation of IR pulses sent the signal to receivers placed In each cage, which was roughly separated optically from the other cages. All the transmitters and receivers were Identical : one animal was equiped Indistinctly with any transmitter, and then could be placed In any cage. This brought a new concept In biotelemetry compared to radio-frequency transmission : the system Is extremely reliable and simple to use, and provides optimal flexibility in the everyday laboratoy functionnlng.