A system for processing heart rate measurement data measured during a physical exercise of a user. The system includes a server computer configured to: associate, during a registration procedure for a measurement device of a user, a device identifier of the measurement device with a user account of the user stored in the server computer; receive a device identifier and real-time heart rate measurement data over a network connection; identify the user's measurement device from the received device identifier; and store the received heart rate measurement data to the user account of the user on the basis of the association between the received device identifier and the corresponding user account.