Conclusions Exercise-based cardiac rehabilitation is effective at reducing important clinical outcomes in patients with coronary heart disease .
While our analysis was constrained by the quality of included trials and missing information about intervention components , there appears to be little differential effect of variations in exercise intervention , particularly on mortality outcomes .
Background While the clinical benefits of exercise-based cardiac rehabilitation are well established , there is extensive variation in the interventions used within these trials .
It is unknown whether variations in individual components of these exercise interventions provide different relative contributions to overall clinical outcomes .
This study aims to systematic ally examine the relationship between individual components of the exercise intervention in cardiac rehabilitation ( such as intensity and frequency ) and clinical outcomes for people with coronary heart disease .
Benefits and weaknesses of a cardiac rehabilitation programme.
The British Heart Foundation and the Chest , Heart and Stroke Association have allocated funds to develop cardiac rehabilitation programmes . We have recently completed and now evaluate an exercise-based rehabilitation course reinforced with advice about return to normal activity for 110 patients who had suffered acute myocardial infa rct ion . Patients admitted to the Plymouth cardiac care unit were r and omised into groups : a control group to receive st and ard hospital care , and a rehabilitation group who , in addition , received an exercise programme reinforced with advice . Patients were assessed at entry to the study and at intervals thereafter . Assessment was by question naire and objective tests consisting of a 12-minute walking test and weekly outpatient pedometry . In the rehabilitation group patients were able to walk further and faster , return to work earlier , undertake more housework , and resume normal sexual activity ; they were less short of breath and did not experience more angina . However , the rehabilitation course brought little benefit to the patients ' perception of well-being and their anxiety about health or their outlook on life .  Exercise and advice are important components of a rehabilitation programme , but more attention needs to be given to the psychological aspects of recovery from a heart attack
Conclusions Exercise-based cardiac rehabilitation is effective at reducing important clinical outcomes in patients with coronary heart disease .
While our analysis was constrained by the quality of included trials and missing information about intervention components , there appears to be little differential effect of variations in exercise intervention , particularly on mortality outcomes .
Background While the clinical benefits of exercise-based cardiac rehabilitation are well established , there is extensive variation in the interventions used within these trials .
It is unknown whether variations in individual components of these exercise interventions provide different relative contributions to overall clinical outcomes .
This study aims to systematic ally examine the relationship between individual components of the exercise intervention in cardiac rehabilitation ( such as intensity and frequency ) and clinical outcomes for people with coronary heart disease .