Relationship of trait, Type A behavior, and physical fitness variables to cardiovascular reactivity and coronary heart disease risk potential

Associations between Hunter Type A/B Personality and Cardiovascular Risk Factors from Adolescence through Young Adulthood

PURPOSE

Type A personality, characterized by action-oriented tendencies, has been linked to cardiovascular disease in middle-aged and elderly adults. Alternatively, limited research has tested whether personality type A/B and cardiovascular (CVD) risk are linked prior to adulthood. Therefore, we used the Hunter-Wolf A/B personality score to determine whether personality type A/B is associated with traditional CVD risk factors during adolescence, and more importantly if personality type, or its individual type A components, are associated with cardiovascular risk through young adulthood. This study is the first to assess personality type A/B on a continuous spectrum with regard to its relationship with cardiovascular disease risk, as well as the first to examine this association in a biracial, adolescent population.

METHODS

Subjects (3396) from the Bogalusa Heart Study were surveyed from 1984 to 1986, and multivariable regression was used to test adjusted, cross-sectional associations between personality type A/B, as determined by Hunter-Wolf A/B personality questionnaire, and CVD risk factors during adolescence. To test whether associations existed longitudinally, subjects were followed through 2007, and general estimating equation (GEE) models were used to examine the associations of personality type A/B with CVD risk factors, as well as with Framingham risk score as a global score of CVD risk. The component traits of type A personality (leadership, hard-driving, eagerness-energy, and impatience-aggression) were tested individually to determine their independent, longitudinal associations with global CVD risk.

RESULTS

Baseline mean (SD) age was 15.9(5.2). Mean( SD) Hunter-Wolf score in was 96.9 (11.6). After adjustment, more type A Hunter-Wolf scores were cross-sectionally associated with lower alcohol consumption (p = 0.03), female gender (p < 0.0001), and black race (p < 0.0001) in adolescence. After follow-up (median = 11 years), personality type A/B as the continuous Hunter-Wolf score was non-linearly associated with young adult BMI (p = 0.01), fasting blood glucose (p < 0.01), and Framingham score (p = 0.05). Of the type A components, leadership and hard-driving were non-linearly associated with Framingham risk at follow-up (both p < 0.0001).

CONCLUSIONS

Adolescent personality type A is associated with female gender and black race. Generally, type A children have higher CVD risk during young adulthood, though this relationship is non-linear. Additionally, adolescents exhibiting strong leadership-oriented personality traits have worse cardiovascular risk profiles in early adulthood, whereas hard-driving adolescent personalities are protective of young adult CVD risk. Our results warrant consideration of personality as a continuous, non-categorical, trait in studies of cardiovascular disease.

Exploring the relation between changes in NT-proBNP and renal function in patients with suspected heart failure using structural equation modelling

BACKGROUND

The relation between changes in NT-proBNP and renal function has commonly been studied using multiple regressions, which may ignore the complexity of relations between related variables.

METHODS AND RESULTS

Data were collected from patients referred with suspected heart failure (HF) to a community service. Structural equation modelling (SEM) was used to assess the association between changes in NT-proBNP at 1year, and other pre-specified variables including age, sex, BMI, eGFR, loop diuretics and ACE inhibitor. Of 1006 patients with a follow-up NT-proBNP at 1year, 882 (88%) had HF. The baseline median age was 72 (IQR: 63-78) years, 732 (73%) were men, 668 (66%) had left ventricular systolic dysfunction and 769 (76%) had NT-proBNP>400pg/ml. For all patients at 1year, 243 (24%) patients had at least a 50% reduction in NT-proBNP, and 199 (20%) had at least a 50% increase, only 40 (3%) had <3% change. Change in NT-proBNP was strongly associated with baseline NT-proBNP (the standardized coefficient (r)=0.73, p<0.001). The change in NT-proBNP was not associated with changes in eGFR, and was indirectly related with age, BMI, eGFR and loop diuretics (p<0.01 for all).

CONCLUSIONS

Baseline NT-proBNP was the main determinant of change in NT-proBNP at one year.

Associations between Hunter Type A/B Personality and Cardiovascular Risk Factors from Adolescence through Young Adulthood

PURPOSE

Type A personality, characterized by action-oriented tendencies, has been linked to cardiovascular disease in middle-aged and elderly adults. Alternatively, limited research has tested whether personality type A/B and cardiovascular (CVD) risk are linked prior to adulthood. Therefore, we used the Hunter-Wolf A/B personality score to determine whether personality type A/B is associated with traditional CVD risk factors during adolescence, and more importantly if personality type, or its individual type A components, are associated with cardiovascular risk through young adulthood. This study is the first to assess personality type A/B on a continuous spectrum with regard to its relationship with cardiovascular disease risk, as well as the first to examine this association in a biracial, adolescent population.

METHODS

Subjects (3396) from the Bogalusa Heart Study were surveyed from 1984 to 1986, and multivariable regression was used to test adjusted, cross-sectional associations between personality type A/B, as determined by Hunter-Wolf A/B personality questionnaire, and CVD risk factors during adolescence. To test whether associations existed longitudinally, subjects were followed through 2007, and general estimating equation (GEE) models were used to examine the associations of personality type A/B with CVD risk factors, as well as with Framingham risk score as a global score of CVD risk. The component traits of type A personality (leadership, hard-driving, eagerness-energy, and impatience-aggression) were tested individually to determine their independent, longitudinal associations with global CVD risk.

RESULTS

Baseline mean (SD) age was 15.9(5.2). Mean( SD) Hunter-Wolf score in was 96.9 (11.6). After adjustment, more type A Hunter-Wolf scores were cross-sectionally associated with lower alcohol consumption (p = 0.03), female gender (p < 0.0001), and black race (p < 0.0001) in adolescence. After follow-up (median = 11 years), personality type A/B as the continuous Hunter-Wolf score was non-linearly associated with young adult BMI (p = 0.01), fasting blood glucose (p < 0.01), and Framingham score (p = 0.05). Of the type A components, leadership and hard-driving were non-linearly associated with Framingham risk at follow-up (both p < 0.0001).

CONCLUSIONS

Adolescent personality type A is associated with female gender and black race. Generally, type A children have higher CVD risk during young adulthood, though this relationship is non-linear. Additionally, adolescents exhibiting strong leadership-oriented personality traits have worse cardiovascular risk profiles in early adulthood, whereas hard-driving adolescent personalities are protective of young adult CVD risk. Our results warrant consideration of personality as a continuous, non-categorical, trait in studies of cardiovascular disease.

The Cost of Self-Protection: Threat Response and Performance as a Function of Autonomous and Controlled Motivations

Seventy-seven undergraduates, primed for autonomous or controlled motivation, were videotaped and physiologically monitored during a stressful interview and subsequent speech. Interview videotapes were coded for behavioral measures of threat response; speech videotapes were coded for performance. It was hypothesized that relative to controlled motivation, autonomous motivation would decrease interview threat response and enhance speech performance, and that threat response would mediate the effect of motivation on performance. Results support the prediction across measures of verbal, paralinguistic, smiling, vocal fundamental frequency, and cardiovascular response. Autonomously primed participants continued to show less cardiovascular threat throughout the later speech and gave better speeches. Finally, speech performance was mediated by interview threat response. Results demonstrate that relative to controlled motivation, autonomous motivation lowers threat response, which enhances performance.

Dehydration does not influence cardiovascular reactivity to behavioural stress in young healthy humans

Enhanced hydration increases the human cardiovascular reactivity to mental stress. If reduced water intake has the opposite effect, this would suggest controlling for water deprivation when studying such responses. Blood pressure, heart rate and parasympathetically dominated beat-to-beat heart rate fluctuations were assessed during resting baseline and mental stress. Two challenging cognitive-motor tasks, a 5-Choice Reaction Time Task (CRTT) and a Paced Auditory Serial Addition Task (PASAT), served as mental stress tests. Eight female and eight male volunteers were examined twice, after 24 h of water deprivation and after normal water intake (counterbalanced order, 7-day interval). Water deprivation resulted in moderate dehydration with a mean 2.6% decrease of total body weight. Dehydration did neither affect baseline blood pressure, heart rate, nor blood pressure reactivity to mental stress. However, dehydration slightly (-1.2 bpm) diminished heart rate reactivity to the PASAT (P = 0.03) and increased beat-to-beat heart rate fluctuations in response to the CRTT (P = 0.05). Dehydration intensified CRTT- and PASAT-induced reductions of beat-to-beat heart rate fluctuations in females (gender x dehydration interactions: P = 0.04-0.05). Moderate dehydration induced by water restriction has no effect on blood pressure reactivity to mental stress. The effects on heart rate reactivity are small. However, stress-induced parasympathetic withdrawal may be fortified during dehydration in females, which suggests controlling for water intake when studying such responses.

Cardiorespiratory fitness and laboratory stress: a meta-regression analysis

We performed a meta-regression analysis of 73 studies that examined whether cardiorespiratory fitness mitigates cardiovascular responses during and after acute laboratory stress in humans. The cumulative evidence indicates that fitness is related to slightly greater reactivity, but better recovery. However, effects varied according to several study features and were smallest in the better controlled studies. Fitness did not mitigate integrated stress responses such as heart rate and blood pressure, which were the focus of most of the studies we reviewed. Nonetheless, potentially important areas, particularly hemodynamic and vascular responses, have been understudied. Women, racial/ethnic groups, and cardiovascular patients were underrepresented. Randomized controlled trials, including naturalistic studies of real-life responses, are needed to clarify whether a change in fitness alters putative stress mechanisms linked with cardiovascular health.

Violence exposure and optimism predict task-induced changes in blood pressure and pulse rate in a normotensive sample of inner-city black youth

OBJECTIVE

This investigation examined the association of violence exposure (home and neighborhood) and optimism to task-induced changes in systolic blood pressure (SBP), diastolic blood pressure (DBP), and pulse rate (PR).

METHODS

Drawn from a larger investigation, the convenience sample for this study consisted of 172 normotensive black youth (mean age = 11.5 years, standard deviation = 1.3). Violence exposure and optimism were self-reported by participants, and task-induced changes in SBP, DBP, and PR were measured with an automated monitor during two sequentially administered digit-forward and digit-backward tasks.

RESULTS

Hierarchical regression analyses revealed that violence exposure was inversely related to task-induced changes in SBP (p = .010) and DBP (p = .005). Optimism was not an independent predictor of blood pressure or PR changes (p-s > .32). The final step of these hierarchical analyses indicated that the effects of violence exposure and optimism interacted to predict task-induced changes in SBP (p = .013) and PR (p = .003). Follow-up regression analyses indicated that violence exposure was inversely related to task-induced changes in SBP among participants high in optimism and was positively associated with PR reactivity in participants low in optimism.

CONCLUSIONS

The youth in this study have intact mechanisms for buffering blood pressure responses to violence exposure, especially those who are more optimistic about their future-a person factor whose moderating effects might wane with advancing age.

The relationship between depression and cardiovascular disease

Evidence from epidemiological studies has established that depression is a risk factor for the development of cardiovascular disease (CVD) and that the comorbidity of depression with pre-existing CVD worsens the prognosis for sufferers of CVD. Depression has also been associated with other behaviours that impact on CVD, such as medication non-compliance, and an unwillingness to adopt an exercise program, that reduce the likelihood of successful rehabilitation from CVD. Published literature on the current knowledge of the association between depression and CVD is reviewed in this paper.

Influence of cholesterol and fasting insulin levels on blood pressure reactivity

OBJECTIVE

This study examined how cholesterol and fasting insulin levels are related to blood pressure reactivity to behavioral stressors.

METHODS

Subjects (N = 116) were 20 to 52 years old, at 80% to 150% of ideal weight, and had an average fasting cholesterol level of 183 mg/dl. Stressor tasks included mirror star tracing and a videotaped speech task. Changes from baseline were calculated for systolic and diastolic blood pressure.

RESULTS

Neither cholesterol nor insulin was independently related to blood pressure change scores. However, after controlling for body mass, a two-way analysis of variance revealed a significant cholesterol-by-insulin interaction for change in diastolic blood pressure (p = .022). Subjects in the high-cholesterol/high-insulin group showed the greatest increase in diastolic blood pressure reactivity.

CONCLUSIONS

In a general population, people with a below-average cholesterol level experience only moderate cardiovascular reactivity to mental stressors regardless of their fasting insulin level. However, for people with an above-average cholesterol level, fasting insulin level is an important factor in determining potential reactivity to mental stressors. These findings highlight the importance of adequate sample size to allow for the analysis of such interactions in future studies of cholesterol, insulin, and blood pressure reactivity.