Related Experiment Videos
Should patients with heart disease exercise in the morning or afternoon?
P M Murray1, D M Herrington, C W Pettus
1Section of Cardiology, Bowman Gray School of Medicine, Wake Forest University, Winston, Salem, NC.
Objective:
To compare the cardiovascular risk of exercise in the morning and afternoon in patients with established heart disease.
Design:
Retrospective cohort study.
Patients:
Patients with established heart disease referred for participation in a comprehensive cardiac rehabilitation program.
Intervention:
Supervised, submaximal exercise (1 hour three times per week) performed either in the morning (7:30 AM) or the afternoon (3 PM).
Main Outcome:
Documented cardiac events that occurred while patients were exercising in the rehabilitation programs.
Results:
There were five cardiac events in 168,111 patient-hours of exercise in the morning, with an incidence of 3.0 +/- 1.3 events per 100,000 patient-hours. There were two events during the 84,491 patient-hours of exercise in the afternoon, for an incidence of 2.4 +/- 1.5 events per 100,000 patient-hours (not significant). The risk ratio of cardiac events during exercise in the morning compared with the afternoon was 1.27 (95% confidence interval, 0.25 to 6.55).
Conclusion:
In patients with coronary artery disease, the incidence of cardiac events is low during regular, submaximal exercise whether performed in the morning or the afternoon.