Psychosocial outcomes of an exercise maintenance intervention after phase II cardiac rehabilitation.

PURPOSE: Maintenance of exercise after completing phase II cardiac rehabilitation (CR) is challenging for many patients. We offered a telephone-based maintenance intervention and found improvement in exercise participation in the intervention group at 12 months post-CR discharge. We examined the effects of the intervention on psychosocial outcomes. METHODS: The effects of a home-based exercise maintenance intervention on psychosocial outcomes among patients who had completed phase II CR versus contact control were evaluated in a randomized controlled trial. Data were collected in 2005 to 2010 and analyzed in 2011. One hundred thirty patients (mean age = 63.6 [SD = 9.7] years, 20.8% female) were randomized to exercise counseling (Maintenance Counseling group, n = 64) or contact control (Contact Control group, n = 66). Maintenance Counseling group participants received exercise counseling (based on the transtheoretical model and social-cognitive theory) delivered via telephone for 6 months, as well as print materials and feedback reports. Assessments of depression, quality of life, and mental health were conducted at baseline, 6 months, and 12 months. RESULTS: The Maintenance Counseling group reported statistically significant higher quality of life than the Contact Control group at 6 months (b = 0.29, SE = 0.08, P < .001) and 12 months (b = 0.27, SE = 0.09, P = .002). Intervention effects on depressive symptoms were significant at 12 months (b = -6.42, SE = 2.43, P = .009). Effects on overall mental health were nonsignificant at both followups. No significant moderators of treatment effects were found. CONCLUSION: A telephone-based intervention that helped maintain exercise showed statistically significant improvements in quality of life and reduced depressive symptoms in this patient population.

Maintenance of exercise after phase II cardiac rehabilitation: a randomized controlled trial.

BACKGROUND: Patients who have completed Phase II cardiac rehabilitation have low rates of maintenance of exercise after program completion, despite the importance of sustaining regular exercise to prevent future cardiac events. PURPOSE: The efficacy of a home-based intervention to support exercise maintenance among patients who had completed Phase II cardiac rehabilitation versus contact control was evaluated. DESIGN: An RCT was used to evaluate the intervention. Data were collected in 2005-2010 and analyzed in 2010. SETTING/PARTICIPANTS: One hundred thirty patients (mean age=63.6 years [SD=9.7], 20.8% female) were randomized to exercise counseling (Maintenance Counseling group, n=64) or contact control (Contact Control group, n=66). INTERVENTION: Maintenance Counseling group participants received a 6-month program of exercise counseling (based on the transtheoretical model and social cognitive theory) delivered via telephone, as well as print materials and feedback reports. MAIN OUTCOME MEASURES: Assessments of physical activity (7-Day Physical Activity Recall), motivational readiness for exercise, lipids, and physical functioning were conducted at baseline, 6 months, and 12 months. Objective accelerometer data were collected at the same time points. Fitness was assessed via maximal exercise stress tests at baseline and 6 months. RESULTS: The Maintenance Counseling group reported significantly higher exercise participation than the Contact Control group at 12 months (difference of 80 minutes, 95% CI=22, 137). Group differences in exercise at 6 months were nonsignificant. The intervention significantly increased the probability of participants' exercising at or above physical activity guidelines and attenuated regression in motivational readiness versus the Contact Control Group at 6 and 12 months. Self-reported physical functioning was significantly higher in the Maintenance Counseling group at 12 months. No group differences were seen in fitness at 6 months or lipid measures at 6 and 12 months. CONCLUSIONS: A telephone-based intervention can help maintain exercise, prevent regression in motivational readiness for exercise, and improve physical functioning in this patient population.

Prevalence and characteristics of multiple psychiatric disorders in cardiac rehabilitation patients.

PURPOSE: Anxiety and depressive disorders have been established as independent risk factors for the development of and recovery from coronary heart disease (CHD). However, few studies have reported on the prevalence and personal characteristics of comorbid psychiatric disorders (PD) among cardiac populations. This project examined the prevalence of comorbid depressive and anxiety disorders among men and women with CHD commencing cardiac rehabilitation (CR) and the demographic, medical, and psychosocial characteristics among those meeting multiple PD criteria. METHODS: Participants were 143 CHD patients (M age, 61 years; SD, 11.2; 70% men, 91% Caucasian, 64% married) entering CR who were evaluated via a semistructured, psychiatric interview to assess both current and lifetime prevalence rates of PD. Demographic, medical, and psychosocial variables were also assessed. RESULTS: Approximately 45% met criteria for at least 1 anxiety disorder, and 20% met criteria for either major depressive disorder or dysthymic disorder either at the time of evaluation or in their lifetime. Across all participants, 26% met criteria for >or=2 PD. Of those with a depressive disorder, 76% also met criteria for at least 1 anxiety disorder. Participants with comorbid PD were of younger age and female and reported less education (P < .01). Comorbidity was also associated with self-reported overall diminished physical, emotional, and social quality of life, depression, and anxiety. CONCLUSION: Comorbid PD are highly prevalent in the CR setting and are associated with specific demographic characteristics and reduced quality of life. These data offer additional support that routine screening for PD is warranted in outpatient cardiac settings.

Anxiety characteristics independently and prospectively predict myocardial infarction in men the unique contribution of anxiety among psychologic factors.

OBJECTIVES: This study investigated whether anxiety characteristics independently predicted the onset of myocardial infarction (MI) over an average of 12.4 years and whether this relationship was independent of other psychologic variables and risk factors. BACKGROUND: Although several psychosocial factors have been associated with risk for MI, anxiety has not been examined extensively. Earlier studies also rarely addressed whether the association between a psychologic variable and MI was specific and independent of other psychosocial correlates. METHODS: Participants were 735 older men (mean age 60 years) without a history of coronary disease or diabetes at baseline from the Normative Aging Study. Anxiety characteristics were assessed with 4 scales (psychasthenia, social introversion, phobia, and manifest anxiety) and an overall anxiety factor derived from these scales. RESULTS: Anxiety characteristics independently and prospectively predicted MI incidence after controlling for age, education, marital status, fasting glucose, body mass index, high-density lipoprotein cholesterol, and systolic blood pressure in proportional hazards models. The adjusted relative risk (95% confidence interval [CI]) of MI associated with each standard deviation increase in anxiety variable was 1.37 (95% CI 1.12 to 1.68) for psychasthenia, 1.31 (95% CI 1.05 to 1.63) for social introversion, 1.36 (95% CI 1.10 to 1.68) for phobia, 1.42 (95% CI 1.14 to 1.76) for manifest anxiety, and 1.43 (95% CI 1.17 to 1.75) for overall anxiety. These relationships remained significant after further adjusting for health behaviors (drinking, smoking, and caloric intake), medications for hypertension, high cholesterol, and diabetes during follow-up and additional psychologic variables (depression, type A behavior, hostility, anger, and negative emotion). CONCLUSIONS: Anxiety-prone dispositions appear to be a robust and independent risk factor of MI among older men.

Prevalence of anxiety disorders in men and women with established coronary heart disease.

PURPOSE: Anxiety has been associated with the development and recurrence of coronary heart disease (CHD). The objective of this study was to estimate the prevalence of anxiety disorders in men and women with established CHD. METHODS: One hundred fifty CHD patients were evaluated via a semistructured, psychiatric interview to assess both current and lifetime prevalence rates of anxiety disorders. RESULTS: Approximately 36.0% (n = 54) of cardiac patients met the diagnostic criteria for at least 1 current anxiety disorder, and 45.3% (n = 68) presented with an anxiety disorder at some point in their lifetime. Social phobia and generalized anxiety disorder were the most prevalent anxiety disorders observed, with current prevalence rates of 21.3% and 18.7%, respectively, and a lifetime prevalence of 26%. In addition, the current prevalence rate of specific phobia was approximately 14.7%, whereas 15.3% met the lifetime criteria. Lower prevalence rates for panic disorder (current = 4.7%, lifetime = 5.3%), agoraphobia (current = 3.3%, lifetime = 4.7%), posttraumatic stress disorder (current = 0%, lifetime = 1.5%), and obsessive compulsive disorder (current = 0%, lifetime = 0.7%) were observed. Female cardiac patients evidenced significantly higher current (women = 58.3% vs. 25.5%, P < .001) and lifetime (women = 70.8% vs. men = 33.3%, P < .001) rates of anxiety disorders compared with their male counterparts. CONCLUSIONS: A considerable number of CHD patients evidence a significant history of anxiety. Greater efforts to identify and treat anxiety in outpatient cardiology and cardiac rehabilitation settings are needed.

Hostility and urine norepinephrine interact to predict insulin resistance: the VA Normative Aging Study.

OBJECTIVE: Previous research has produced mixed results pertaining to the association between hostility and insulin resistance. These inconsistent findings may be the result of a lack of studies examining potential moderators of this relationship and inconsistent measures of insulin resistance and/or hostility. We hypothesized that hostility may interact with circulating norepinephrine (NEPI) levels, indexed by 24-hour urine concentrations, to affect insulin resistance. METHODS: Six hundred forty-three men (mean age = 63.1 years) free of diabetic medications completed the Minnesota Multiphasic Personality Inventory and participated in a laboratory assessment. The Cook-Medley Hostility (Ho) and 24-hour urine NEPI were used to predict insulin resistance defined by the homeostatic model assessment (HOMA) index, 2-hour postchallenge glucose (PCGL), and insulin levels (PCIL) after controlling for nine common covariates. RESULTS: Multiple regression showed that the two-way interaction between Ho and NEPI significantly predicted HOMA and PCIL, but not PCGL, after controlling for covariates. Simple regression slopes of Ho on HOMA and PCIL were explored and indicated that, at higher levels of NEPI, higher Ho was associated with higher HOMA (beta = 0.14, p < .05). Ho was not a significant predictor of HOMA at mean and lower levels of NEPI. Similar results were obtained for PCIL, but not PCGL. Cynicism, but not other subscales of Ho, was similarly related to insulin resistance and NEPI. CONCLUSION: Individuals with high stress and high hostility were more likely to have insulin resistance. It is important to study moderators in the relationship between hostility and insulin resistance.

Suppressed hostility predicted hypertension incidence among middle-aged men: the normative aging study.

This study tested whether suppressed hostility predicted incident hypertension (HTN) in initially nonhypertensive men, using prospective data from the Normative Aging Study. Six hundred twenty-seven men who completed the MMPI and participated in a subsequent laboratory assessment were included in the study. The Cook-Medley Hostility scale (Ho), a suppression factor, and other risk factors were used to predict incident HTN over a 3-year period. Logistic regression showed a significant three-way interaction among Ho, suppression, and age in predicting incident HTN. Among middle-aged men (

Combined effect of the metabolic syndrome and hostility on the incidence of myocardial infarction (the Normative Aging Study).

A growing body of evidence suggests that the metabolic syndrome and hostility are independent risk factors for the development of coronary heart disease. However, few studies have examined the combined effect of the metabolic syndrome and hostility on the incidence of myocardial infarction (MI). We examined prospectively the relation among the metabolic syndrome, hostility, and the incidence of MI in healthy, older men (mean +/- SD 59.7 +/- 7.2 years) who participated in the Normative Aging Study. Seven hundred fifty-four men who were diagnosed as not having coronary heart disease and diabetes mellitus were included in the present study. Men were assigned to 1 of 4 risk-factor groups based on the presence or absence of the metabolic syndrome and low or high hostility. Hierarchical logistic regression was used to assess the multivariate risk of developing a MI. The incidence of MI was 11.3% (n = 85) over an average follow-up period of 13.8 years. After adjusting for potential covariates, risk-factor group significantly predicted the incidence of MI (odds ratio 1.59, 95% confidence interval 1.29 to 1.96, p <0.0001). The effect was strongest among patients who had the metabolic syndrome and high levels of hostility, with this subgroup showing a fourfold increase in the odds of developing a MI (odds ratio 4.21, 95% confidence interval 2.21 to 8.04, p = 0.0001). In conclusion, it appears that hostility may provide additional prognostic information to the assessment of coronary heart disease risk in patients with the metabolic syndrome and should routinely be evaluated as part of a comprehensive risk factor assessment.

Organ scarcity and the psychological pre-heart transplant evaluation: a simulation study using community residents.

CONTEXT: Although research examining medical outcomes in heart transplantation has progressed, there are few studies examining the impact of organ scarcity and wait list demand on the transplant candidate evaluation process. OBJECTIVE: To examine the influence of transplant knowledge pertaining to organ scarcity and wait list demand on simulated ratings of psychological distress provided by community residents participating in a simulated pre-heart transplant evaluation. DESIGN: A randomized, controlled design. We used a vignette simulation to experimentally manipulate the effect of transplant knowledge pertaining to organ scarcity in a group of community residents with no previous knowledge or experience with the transplant selection process. PARTICIPANTS: One hundred forty-three community residents visiting a department of motor vehicles office in north central Florida were recruited. Community residents were randomly assigned to 1 of 2 experimental conditions, with either mention (n=66) or no mention (n=77) of organ scarcity and wait list demand statistics in their assigned vignette. Participants then served as actors and completed measures of psychological distress as part of a mock psychological pre-heart transplant evaluation. RESULTS: Participants with mention of organ scarcity reported significantly fewer symptoms of anxiety and depression compared to those with no mention of organ scarcity. This relationship remained significant even after controlling for relevant covariates, including age and simulated ratings of social desirability. CONCLUSION: Transplant knowledge pertaining to organ scarcity and wait list demand may influence transplant candidates to report fewer symptoms of psychological distress. Clinical suggestions for dealing with underreporting of psychological distress are discussed.

Prevalence of depressive disorders in men and women enrolled in cardiac rehabilitation.

PURPOSE: Epidemiological studies have demonstrated that depression is an independent risk factor for the development and recurrence of coronary heart disease (CHD). The prevalence of depressive disorders, however, is not well documented in CHD patients enrolled in cardiac rehabilitation (CR). The purpose of this study was to estimate the prevalence of current and lifetime depressive disorders in the CR setting. METHODS: One hundred ten men and women diagnosed with CHD and enrolled in a phase II CR program were screened via a psychiatric, structured interview to assess current and lifetime history of major depressive disorder, minor depression, and dysthymic disorder. RESULTS: A total of 17 (15.5%) individuals screened positive for a current depressive disorder at entry into the CR program, with 10 (9.1%) individuals screening positive for major depressive disorder, 7 (6.4%) for minor depression, and 6 (5.5%) for dysthymic disorder. With respect to lifetime prevalence of mood disorders, 29 (26.4%) individuals met the diagnostic criteria for at least one depressive disorder during their lifetime. The lifetime prevalence of major depressive disorder, minor depression, and dysthymic disorder was 11.8%, 14.5%, and 10.9%, respectively. Female CR participants evidence significantly higher current and lifetime prevalence rates for depressive disorders compared to their male counterparts. CONCLUSIONS: The results of this study suggest that a substantial number of CHD patients enrolled in CR report a clinically significant history of depression. Efforts to assess and treat depression are needed in the CR setting and may be associated with better adherence to lifestyle modification programs.

Effect of negative emotions on frequency of coronary heart disease (The Normative Aging Study).

Negative emotions, such as depression and anxiety, have been associated with the development of coronary heart disease (CHD). In multivariate models, negative emotions have predicted CHD outcomes, such as nonfatal myocardial infarction and CHD mortality. Few studies, however, have investigated this relation while controlling for variables associated with the metabolic syndrome or those indicative of sympathetic nervous system activity. We prospectively examined the relation between negative emotions and incident CHD in older men (mean 60.3 +/- 7.9 years) participating in the Normative Aging Study (NAS). Four hundred ninety-eight men who completed the Minnesota Multiphasic Personality Inventory (MMPI) and who participated in a subsequent laboratory assessment were included in the study. All men were not on medication and free of diagnosed CHD and diabetes. Negative emotions were measured by the MMPI Welsh A scale, which is comprised of 39 items measuring symptoms of depression and anxiety. Negative emotion score, sociodemographic characteristics, health behaviors, components of the metabolic syndrome, and stress hormones were used to predict incident CHD over a 3-year follow-up period. During follow-up, 45 CHD events were observed. In unadjusted logistic regression analyses, negative emotions significantly predicted the incidence of CHD (odds ratio [OR] 1.06, 95% confidence interval [CI] 1.01 to 1.10, p = 0.02). After adjusting for potential covariates, negative emotions continued to predict the incidence of CHD (OR 1.06, 95% CI 1.01 to 1.12, p = 0.02) A linear, dose-response relation was observed (chi-square 10.8, degree of freedom 2, p = 0.005): participants who had the highest level of negative emotions experienced the greatest incidence of CHD.

Depressive symptoms and metabolic risk in adult male twins enrolled in the National Heart, Lung, and Blood Institute twin study.

OBJECTIVE: To determine the extent to which depressive symptoms are associated with metabolic risk factors and whether genetic or environmental factors account for this association. METHOD: Twin structural equation modeling was employed to estimate genetic and environmental contributions to the covariation of depressive symptoms, as indexed by the Centers for Epidemiological Studies-Depression Scale, and common variance among blood pressure, body mass index, waist-to-hip ratio, and serum triglycerides and glucose among 87 monozygotic and 86 dizygotic male twin pairs who participated in the NHLBI twin study. RESULTS: Depressive symptoms were associated with individual components of the metabolic syndrome and common variance among the risk factors. Twin structural equation modeling indicated that the associations were attributable to environmental (nongenetic) factors. CONCLUSIONS: These results support the hypothesis that depressive symptoms may increase risk for a pattern of physiological risk consistent with the metabolic syndrome.

Are metabolic risk factors one unified syndrome? Modeling the structure of the metabolic syndrome X.

The metabolic syndrome, manifested by insulin resistance, obesity, dyslipidemia, and hypertension, is conceived to increase the risk for coronary heart disease and type II diabetes. Several studies have used factor analysis to explore its underlying structure among related risk variables but reported different results. Taking a hypothesis-testing approach, this study used confirmatory factor analysis to specify and test the factor structure of the metabolic syndrome. A hierarchical four-factor model, with an overarching metabolic syndrome factor uniting the insulin resistance, obesity, lipid, and blood pressure factors, was proposed and tested with 847 men who participated in the Normative Aging Study between 1987 and 1991. Simultaneous multi-group analyses were also conducted to test the stability of the proposed model across younger and older participants and across individuals with and without cardiovascular disease. The findings demonstrated that the proposed structure was well supported (comparative fit index = 0.97, root mean square error approximation = 0.06) and stable across subgroups. The metabolic syndrome was represented primarily by the insulin resistance and obesity factors, followed by the lipid factor, and, to a lesser extent, the blood pressure factor. This study provides an empirical foundation for conceptualizing and measuring the metabolic syndrome that unites four related components (insulin resistance, obesity, lipids, and blood pressure).

Hostility, the metabolic syndrome, and incident coronary heart disease.

This invesgation examined the impact of hostility and the metabolic syndrome on coronary heart disease (CHD) using prospective data from the Normative Aging Study. Seven hundred seventy-four older, unmedicated men free of cardiovascular disease were included in the study. The total Cook-Medley Hostility (Ho) Scale score, anthropometric data, serum lipids, fasting insulin concentrations, blood pressure, cigarette smoking, alcohol consumption, and total dietary calories were used to predict incident CHD during a 3-year follow-up interval. Multivariate analysis indicated that only Ho positively predicted and high-density lipoprotein cholesterol level negatively predicted incident CHD. Ho's effects on CHD may be mediated though mechanisms other than factors that constitute the metabolic syndrome.