A system for recording electrophysiological signals in flight.

A special preamplifying system was designed to record electrophysiological signals on fighter aircrew in flight. The system is composed of two elements worn by the pilot in a specially designed jacket. The first element is a preamplifying device for ECG or EMG signals, which includes one or two accelerometer channels, according to the needs of the studies. All recorded signals may thus be correlated with the accelerations actually sustained by the pilot. Accelerometers are new generation equipment. Accelerometer and preamplifier performances have been measured and are reported. The recorder performance has been tested on a centrifuge under high acceleration. The results show that up to +10 G, no frequency shift and no change in the harmonic distortion between acceleration and resting stages have been measured. An example of surface EMG recording on two neck muscles during head movements under high-G loading in flight is given.