Patent 7917198 was granted and assigned to Polar Electro on March, 2011 by the United States Patent and Trademark Office.
In the solution of the invention, an association is formed between activity information characterizing the activity level of a user and a performance parameter value proportional to the heart rate information of the user, the activity information and heart rate information having been measured in a user-specific performance monitor, and the heart rate information being responsive to the activity level.