Randomised controlled trials (RCTs) of patients older than 45 years with coronary artery disease who suffered myocardial infarction and/or had coronary artery bypass grafting were eligible for inclusion if they applied resistance exercises in the cardiac rehabilitation process with or without another exercise mode. Studies of coronary artery disease patients who underwent other surgical operations and that focused solely on exercises other than resistance exercises in rehabilitation were excluded.
The proportion of males in the included studies ranged from 0 to 100%. Most studies had participants with an average age under 60 years. All interventions were supervised, less than three to nine months duration and were reported were performed between three and nine months after myocardial infarction and/or coronary artery bypass grafting. Included studies used either resistance exercises only or a combination of resistance and aerobic exercises,. Most studies evaluated aerobic capacity through peak oxygen consumption (peak VO2). Muscle strength, body composition, quality of life and acute haemodynamic effects were also evaluated.
The authors stated neither how papers were selected for the review nor how many reviewers performed the selection.