1. A method for determining an exercise parameter during or after a physical performance by a person, comprising measuring the pulse of the heart by means of a pulse sensor, a pulse level is determined on the basis of the measurement, said exercise parameter is calculated on the basis of the pulse value, wherein determining a recovery pulse value on the basis of the pulse value and predefined pre-data, the recovery pulse value being dynamically varied during the exercise, determining the said exercise parameter being determined by using the recovery pulse value.