The invention relates to a method of detecting stability within an activity performed by a user. The method comprises receiving activity data indicative of the activity performed by the user during a first time interval, the activity data comprising a plurality of measurements and respective timestamps associated to at least one activity parameter monitored during the first time interval receiving cardiovascular and cardiac data indicative of the activity performed by the user during a second time interval, the cardiovascular and cardiac data comprising a plurality of measurements and respective timestamps associated to at least one cardiovascular and cardiac parameter monitored during the second time interval a processor comparing at least some of the cardiovascular and cardiac data with at least one threshold range and on the processor detecting a threshold set of cardiovascular and cardiac data lying within the at least one threshold range within a third time interval: generating a stability alert associated to the cardiovascular and cardiac data and generating a stability alert associated to the activity data having respective timestamps not earlier than the timestamps associated to the threshold set of cardiovascular and cardiac data. The invention also relates to similar systems and computer-executable instructions.La présente invention concerne un procédé de détection de la stabilité dans une activité conduite par un utilisateur. Le procédé comprend la réception de données dactivité indicative lactivité conduite par lutilisateur pendant un premier intervalle de temps, les données dactivité comprenant une pluralité de mesures et dhorodatages respectifs associés à au moins un paramètre dactivité surveillé pendant le premier intervalle de temps la réception de données cardiovasculaires et cardiaques indicatives de lactivité conduite par lutilisateur pendant un deuxième intervalle de temps, les données cardiovasculaires et cardiaques comprenant une pluralité de
