The information relating to physical and/or biomedical parameters of a person carrying out, in real conditions, an activity distinguished by high mechanical stresses is detected by sensors (10, 12, 16, 18, 20, 22, 30) which are mounted on, or form part of, a garment worn while carrying out said activity. During all the stages of said activity this information is converted into data in digital format which are stored in an electronic recording device (100) or “data logger”.Advantages: the stored data may be used by other persons also far from the location where the activity is being performed and/or at a later time.
