Heart rate control device

A heart-rate control device comprising:

• a detector configured to detect heartbeat information of a subject;
• and
• a processor configured to generate, based on the heartbeat information, a stimulus pattern which is a combination of a sympathetic nerve stimulus for stimulating sympathetic nerves and having a first frequency, a parasympathetic nerve stimulus for stimulating parasympathetic nerves and having a second frequency different from the first frequency, and an initialization stimulus for preventing stimulus saturation of the sympathetic nerves or the parasympathetic nerves and having at least a third frequency between the first frequency and the second frequency,
• wherein the processor is further configured to:
• obtain information on a target value relating to a heart rate of the subject,
• extract a difference between the target value and a current value relating to the heart rate of the subject, the current value being calculated from the heartbeat information,
• generate the stimulus pattern depending on the difference so that the current value approaches the target value, and
• output the stimulus pattern, and
• wherein the processor is further configured to generate, as the stimulus pattern,
• a second stimulus pattern in which the initialization stimulus, the sympathetic nerve stimulus continuing for a first period, the parasympathetic nerve stimulus continuing for a second period, and the initialization stimulus are outputted in sequence, the first period being 1 to 2 seconds, and the second period being 50 to 100 seconds, or
• a third stimulus pattern in which the initialization stimulus, the parasympathetic nerve stimulus continuing for the first period, the sympathetic nerve stimulus continuing for the second period, and the initialization stimulus are outputted in sequence, the first period being 1 to 2 seconds, and the second period being 50 to 100 seconds,
• wherein as the stimulus pattern, the processor is further configured to generate a first stimulus pattern in which the initialization stimulus is outputted before and after the sympathetic nerve stimulus or the parasympathetic nerve stimulus for a period which is longer than the first period and shorter than the second period.