Transfer functions for arterial oxygen saturation during +Gz stress.
Discrete, finite, Fourier transforms of input +Gz stress and output arterial oxygen saturation (Sao2) were used to obtain transfer functions between G and Sao2 in 12 subjects. Ensemble averaging of transfer functions based on responses to variable G stress provided reasonable capability for predicting Sao2 responses to sustained 6-G stress. Prediction of responses to variable G stress from transfer functions based on responses to sustained G stress was unsuccessful, however. A synthetic transfer function with physiologic explicability and substantial predictive ability was obtained from an impulse response fabricated from simple mathematical functions.
D000337:Aerospace Medicine; D001158:Arteries; D005583:Fourier Analysis; D006112:Gravitation; D006801:Humans; D008954:Models, Biological; D010100:Oxygen / Q000097:blood*
D010100:Oxygen