CORRESPONDENCE: LETTERS TO THE EDITOR
Cardiac Rehabilitation, Exercise Training, and Psychosocial Risk Factors: Reply
Alan Rozanski, MD* and
James Blumenthal, PhD
* St. Lukes/Roosevelt Hospital, Department of Medicine, 1111 Amsterdam Avenue, New York, New York 10025-1716 (Email: ar77{at}columbia.edu).
We agree with Drs. Lavie and Milani that exercise is a well-established intervention for the secondary prevention of coronary heart disease (CHD), and is a major component of cardiac rehabilitation programs (1,2). We also are aware that cardiac rehabilitation services are seriously underutilized. For example, according to a recent position paper from the American Heart Association (3) only 10% to 20% of eligible patients actually participate in cardiac rehabilitation. A meta-analysis (4) reported results from 32 studies with 16,804 patients eligible for cardiac rehabilitation and reported that only 25% to 31% of eligible men and 11% to 20% of eligible women participated. It is evident that many physicians do not refer patients to cardiac rehabilitation, and this reluctance is especially true for women and minorities (5).
As alluded to by Drs. Lavie and Milani, exercise cannot only induce beneficial physiological adaptations, but can also improve psychological functioning. For example, in a recent randomized trial, exercise training decreased depressive symptoms as effectively as antidepressant medication in patients with clinical depression (6,7). Other work by Thayer et al. (8) has demonstrated that even short bursts of exercise activity can effectively increase energy or decrease tension for two-hour periods. Recent data also emphasize the beneficial effects of exercise on cognitive function and brain plasticity (9). However, because poor adherence to exercise training is relatively common, effective strategies for optimizing patient adherence are needed (10).
It also should be noted that, though there is an extensive literature documenting the value of exercise in patients with coronary artery disease (CAD), data regarding the significance of stress-management training in improving clinical outcomes are limited. A nonrandomized trial of patients with stable CHD showed that stress-management training was associated with reduced ischemia, fewer cardiac events, and lower medical costs compared to usual care controls (11,12). In the absence of data from large multicenter randomized clinical trials with "hard" clinical end points, we advocate for smaller studies using intermediate biomarkers of cardiovascular risk (13). For example, in a recent study (14) both exercise and stress-management training were found to reduce myocardial ischemia and improve vascular endothelial function, compared to usual care. Furthermore, stress management was actually superior to exercise training in improving measures of heart rate variability and baroreflex sensitivity. These data would strongly support the potential clinical benefits of both exercise and stress management in the routine care of patients with CHD.
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References
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- Wenger NK, Froehlicher ES, Smith LK, et al. Cardiac rehabilitationclinical practice guidelines. Rockville, MD: Agency for Health Care Policy and Research and the National Heart, Lung and Blood Institute; 1995ACHPR publication no. 96-0672.
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- Thayer RE, Newman JR, McClain TM. Energy, tiredness, and tension effects of a sugar snack vs moderate exercise J Pers Soc Psychol 1987;52:119-125.[CrossRef][ISI][Medline]
- McAuley E, Kramer AF, Colcombe SJ. Cardiovascular fitness and neurocognitive function in older adultsa brief overview. Brain Behav Immun 2004;18:214-220.[CrossRef][ISI][Medline]
- Rozanski A. Integrating psychologic approaches into the behavioral management of cardiac patients Psychosom Med 2005;67(Suppl 1):S67-S73.[Abstract/Free Full Text]
- Blumenthal JA, Jiang W, Babyak MA, et al. Stress management and exercise training in cardiac patients with myocardial ischemia. Effects on prognosis and evaluation of mechanisms Arch Intern Med 1997;157:2213-2223.[Abstract]
- Blumenthal JA, Babyak M, Wei J, et al. Usefulness of psychosocial treatment of mental stress-induced myocardial ischemia in men Am J Cardiol 2002;89:164-168.[CrossRef][ISI][Medline]
- Rozanski A, Blumenthal JA, Davidson KW, et al. The epidemiology, pathophysiology, and management of psychosocial risk factors in cardiac practicethe emerging field of behavioral cardiology. J Am Coll Cardiol 2005;45:637-651.[Abstract/Free Full Text]
- Blumenthal JA, Sherwood A, Babyak M, et al. Effects of exercise and stress management training on markers of cardiovascular risk in patients with ischemic heart diseasea randomized controlled trial. JAMA 2005;293:1626-1634.[Abstract/Free Full Text]
Related articles in JACC:
- Cardiac Rehabilitation, Exercise Training, and Psychosocial Risk Factors
- Carl J. Lavie and Richard V. Milani
JACC 2006 47: 212.
[Full Text]