The invention relates to a stimulation device (1) for the activation of at least one muscle involved in the measurement of the foot (21) when walking an individual (2) comprising: - sensors (3) put in place on a lower limb (20) of the individual (2) for calculating a flexion angle of the knee (22); electrodes (4) placed on the muscle (s) to be activated and capable of electrically stimulating said muscle (s); - a processing unit (5) receiving the measurement signals from the sensors (3), the processing unit having calculation means (52) for calculating the value of the flexion angle of the knee (22) from the measurement signal received from the sensors (3), and control means (53) of the electrodes (4); characterized in that: • the calculating means (52) determines the oscillation phase in a walking cycle of the individual (2); The control means activate the electrodes (4) only in the oscillation phase of a walking cycle of the individual (2) so that the electrodes (4) generate an electrical stimulation having an intensity function of the bending angle of the knee, the intensity increasing with the decrease of the flexion angle of the knee (22), during the re-extension of the knee during the oscillation phase. L'invention concerne un dispositif (1) de stimulation pour l'activation d'au moins un muscle intervenant dans le relevé du pied (21) lors de la marche d'un individu (2) comprenant : - des capteurs (3) mis en place sur un membre inférieur (20) de l'individu (2) qui permettent de calculer un angle de flexion du genou (22) ; - des électrodes (4) mises en place sur le ou les muscles à activer et propres à stimuler électriquement ledit ou lesdits muscles ; - une unité de traitement (5) recevant les signaux de mesure des capteurs (3), l'unité de traitement présentant des moyens de calcul (52) pour calculer la valeur de l'angle de flexion du genou (22) à partir du signal de mesure reçu des capteurs (3), et des moyens de commande (53