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 .
The group counseling v exercise therapy study. A controlled intervention with subjects following myocardial infarction.
One hundred six postmyocardial infa rct ion subjects who either achieved a mean work load of less than seven mets on treadmill testing , who were rated as anxious and /or depressed , or who met both criteria , participated in a controlled study comparing the rehabilitation effectiveness of exercise therapy and group counseling . Each intervention lasted 12 weeks . Follow-up evaluations were scheduled at three months , six months and one year . Exercise substantially increased mean work capacity , decreased fatigue , lessened anxiety and depression , and promoted independence and sociability .  Counseling substantially reduced depression and promoted a sense of friendliness , and decreased interpersonal friction as well as greater independence and sociability . The control group reported no substantial change on any measured factor . Neither counseling nor exercise had an effect on mortality though subjects in the exercise group reported fewer major cardiovascular sequelae
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 .