Rehabilitation represents an important moment in the diagnostic and therapeutic approach to cardiopathic patients in general and particularly to those with myocardial infarction. In the field of rehabilitation, Holter Monitoring lends itself as an irreplaceable tool of evaluation, able to provide information on: 1) incidence of complex arrhythmias; 2) ischemic attacks; 3) heart-rate trends in relation to physical activity. In the report, the following points are developed: a) How best to record information gathered during the acute and subacute phases of myocardial infarction, necessary to decide on which patients to perform Holter Monitoring. b) Which information derived from ergometric test necessitate the use of Holter Monitoring? c) Can the Holter Monitoring's recorded results offer sufficient contraindications to the starting of physical training? d) The Holter Monitoring's ability to evaluate the risk potential during physical activity and also how this activity influences the arrhythmic situation. e) The prognostic value of the parametres obtained by Holter Monitoring, paying particular attention to the analysis of heart-rate for typical neuro-vegetative signs from the infarct patient. f) Role of Holter Monitoring in the starting of active working lives again. To conclude, new trends in Holter Monitoring evaluations are discussed: --analysis of recordings made during events of sudden-death; --the facility to simultaneously record, in ambulatory patients, electrocardiogram and pulmonary artery pressure.