According to the method to measure in real-time the phase of a pseudo-periodic physiological signal of a user:- one provides a physiological signal (S) of the user- a trigonometric function determination module (14) of a processor determines parameters of a trigonometric function, which minimize a distance between said physiological signal (S) and said trigonometric function on the time interval ]ta tb[ - a phase determination module (13) of a processor determines the phase (fps) of the physiological signal at time tb based on the phase (fbf) of the trigonometric function at time tb.
