A method including use of physiological data from an individual to determine the emission pattern of a pulsed electromagnetic field "PEMF" so that the pattern is personalised to the physiological needs of the individual. The PEMF emission pattern may have a parameter which is calculated based on the physiological data from the individual to cause the physiological state of the individual to be altered or maintained beneficially. The physiological state of the individual can be moved to or towards (or maintained at) an ideal state more effectively than if the physiological data from the individual is not used to determine the PEMF emission pattern. The method may include calculating the PEMF emission pattern based on both idealised data and the physiological data from the individual to produce the PEMF in an intermediate target pattern. The method may also include a feedback loop for continually updating the PEMF emission pattern based on up-to-date physiological data from the individual so as to gradually or incrementally alter the physiological state of the individual. The method may also include the use of the feedback loop for recording of the physiological effect of various PEMF emission patterns on multiple individuals belonging to a subset of the population and determining, using aggregates of the recorded data, improved algorithms for generating more effective PEMF emission patterns for individuals belonging to the same subset.Un procédé comprenant l'utilisation de données physiologiques provenant d'un individu pour déterminer le motif d'émission d'un champ électromagnétique pulsé « PEMF » de telle sorte que le motif est personnalisé selon les besoins physiologiques de l'individu. Le motif d'émission PEMF peut avoir un paramètre qui est calculé sur la base des données physiologiques provenant de l'individu pour amener l'état physiologique de l'individu à être modifié ou maintenu de manière avantageuse. L'état physiologique de l'individu peut être déplacé vers
