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Biomedical subjects

J M MacDougall

Publications and source records attributed to J M MacDougall.

26 records · Page 2Linked to original sources
PubMed1977

Physiologic reactions to social challenge in persons evidencing the type A coronary-prone behavior pattern.

Physiologic measures were recorded in Type A1 (n = 10) and Type B (n = 14) subjects while they engaged in a reaction-time task after receiving instructions emphasizing the need for rapid and accurate performance. Although resting levels were not significantly different, Type A's responded with significantly greater increases than B's in both heart rate and systolic blood pressure, suggesting greater sympathetic arousal. A significant baseline difference between the Types in heart rate variability was also observed suggesting greater lability in sympathetic-parasympathetic function in Type A's. No differences between the Types were obtained for either galvanic skin potential (GSP) or speed of reaction. It is suggested that the paradigm used in the present study offers an inexpensive and efficient means by which cardiovascular reactivity in Type A's and B's may be explored in other and larger groups of subjects.

Adolescent↗
PubMedDate not supplied

Familial resemblance in components of the type A behavior pattern: a reanalysis of the California type A twin study.

Rosenman and colleagues reported no heritability of global Type A behavior assessed by the Structured Interview (SI) method, although some of the self-report scales correlated with global Type A behavior did have heritable components. Recent factor analyses of coded SI responses revealed four independent dimensions: clinical ratings, primarily of speech stylistics; and self-reports of pressured drive, anger, and competitiveness. It may be that some of these dimensions have a heritable base, whereas others do not. We report here reanalyses of the available SI responses from the Rosenman sample. In this subsample, tape recorded interviews with 80 monozygotic and 80 dizygotic twin pairs were scored for the extent of self-reported Type A behaviors, the major speech stylistics considered to be indicative of Pattern A, and the observable Type A behaviors (e.g., signs of hostility). Then scores for the major dimensions measured by the SI were calculated and scores for which there were sufficient data were subjected to twin analyses by the method of Christian et al. These analyses showed that individual differences in the clinical ratings factor and certain ratings loading on it--specifically, loudness of speech, competition for control of the interview, and potential for hostility--might have a heritable component. These results are discussed in the context of the importance of hostility as a predictor of subsequent coronary heart disease events as well as of total mortality, other data on the heritability of emotionality, and a temperament approach to understanding the origins of the Type A behavior pattern.

Adult↗
PubMedDate not supplied

Components of Type A, hostility, and anger-in: relationship to angiographic findings.

Previous research has linked the Type A coronary-prone behavior pattern to angiographically documented severity of coronary atherosclerosis (CAD). The present study sought through component scoring of the Type A Structured Interview (SI) to determine what elements of the multidimensional Type A pattern are related to coronary disease severity in a selected group of patients with minimal or severe CAD. Multivariate analyses controlling for the major risk factors showed no relationship between global Type A and extent of disease. Of all attributes measured, only Potential for Hostility and Anger-In were significantly and positively associated with the disease severity, including angina symptoms and number of myocardial infarctions. Further analysis revealed that Potential for Hostility and Anger-In were interactive in their association, such that Potential for Hostility was associated with disease endpoints only for patients who were high on the Anger-In dimension. These findings support previous research in suggesting that anger and hostility may be the critical aspects of the Type A pattern in predisposing individuals to risk of CAD.

Anger↗
PubMedDate not supplied

Components of hostility as predictors of sudden death and myocardial infarction in the Multiple Risk Factor Intervention Trial.

We tested the hypothesis that hostility is associated with increased relative risk (RR) for coronary death and nonfatal myocardial infarction among participants in the prospective Multiple Risk Factor Intervention Trial (MRFIT). Cases (N = 192) were compared with matched controls (N = 384) on a variety of behavioral characteristics associated with the Type A behavior pattern (TABP), including three different but interrelated components of hostility. Logistic regression analyses revealed that only two of the eight TABP attributes analyzed on the overall sample were significant. Only total Potential for Hostility, when dichotomized into "low" and "high" categories, and the antagonistic interpersonal component of hostility (Stylistic Hostility) had positive unadjusted associations with coronary heart disease (CHD) incidence (RR = 1.7, p = 0.003; and RR = 1.5, p = 0.016, respectively). The global TABP and related paralinguistic attributes were not significantly related to CHD incidence. After adjustment for the traditional risk factors of age, serum cholesterol, blood pressure, and cigarette smoking, only dichotomous Potential for Hostility showed a significant relative risk (RR = 1.5, p = 0.032). Ordinal logistic regression revealed a nonsignificant effect.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗