A method for determining at least one physiological parameter of a driver, pilot or transport of defence vehicle or system operator, comprising: a) injecting or inducing current into said individual b) measuring in said individual an electrical parameter indicating their impedance, comprising: b1) measuring the electrical parameter with at least two pairs of injector-detector electrodes b2) determining the impedance signal from the electrical parameter measured b3) from amongst the impedance signals determined, identifying those with a physiological origin and b4) selecting the pair of electrodes that produce the best quality impedance signal and c) obtaining said physiological parameter from the best quality impedance signal.
