HEART RATE MONITOR DEVICE

A heart rate monitor system (100) for monitoring a heart rate of a user is provided. The heart rate monitor system (100) comprises at least one primary heart rate sensor (110) for measuring or determining a heart rate of a user. The at least one primary heart rate sensor (110) has a first power consumption. The heart rate monitor system (100) also comprises at least one secondary sensor (120) for measuring at least one physiological factor influencing the heart rate of a user. The at least one secondary sensor (120) has a second power consumption which is lower than the first power consumption of the at least one primary heart rate sensor (110). The heart rate monitor system (100) further comprises a power management unit (160) for managing an operation and/or power consumption of the at least one primary heart rate sensor (110) based on information (126) from the at least one secondary sensor (120). The heart rate monitor system comprises a model unit for estimating a heart rate of a user based on a model stored in the model unit and information received from the at least one secondary sensor. The model unit is coupled to the power management unit via a feedback loop such that the power management unit is adapted to compare the estimated heart rate with the measured heart rate and to control the operation of the primary sensor in dependence on the comparison.