title: Beta and alpha adrenergic reactivity elicitable stress study with special reference of electrocardiographic T-wave amplitude.
abstract: Twenty-six healthy young Caucasian males were defined into high hostile (Hi-Ho) group and low hostile (Lo-Ho) group assessed by Cook-Madley's Hostility (Ho) scale. Mental arithmetic task (MA) and forehead cold stimulus task (FCS) were loaded to both Hi-Ho and Lo-Ho groups. Electrocardiographic T-wave amplitude (TWA), heart rate (HR) and coefficient of variance of 100 R-R intervals (CVR-R) were measured continuously during MA and FCS task periods. Greater TWA attenuation was found in Hi-Ho group (p less than 0.05). Although no significant intergroup difference was represented in HR and CVR-R, HR increased significantly (p less than 0.01) in whole subjects and CVR-R was tend to be suppressed during MA period. In addition, comparison of these physiological responses were performed between Type-A and Type-B groups classified by Jenkins' Activity Survey Form-T (JAS-T). There was no significant difference in reactivity of TWA, HR and CVR-R to both two tasks between high and low Type-A scored groups. Previous data suggested that the TWA reactivity in Hi-Ho subjects to cognitive stress showed similar pattern in Type-A individuals. However, autonomic nervous interaction could not be clarified in Hi-Ho subjects. The differentiation of method for assessment of behavioral pattern was also discussed.
authors.affiliation: Department of Psychosomatic Medicine, Tohoku University Hospital, Sendai.
authors.forename: F
authors.initials: F
authors.lastname: Taguchi
authors.forename: J
authors.initials: J
authors.lastname: Suzuki
authors.forename: M
authors.initials: M
authors.lastname: Muranaka
authors.forename: N B
authors.initials: NB
authors.lastname: Anderson
authors.forename: R B
authors.initials: RB
authors.lastname: Williams
mesh_terms: D000293:Adolescent; D000328:Adult; D004562:Electrocardiography; D006339:Heart Rate; D006801:Humans; D008297:Male; D011942:Receptors, Adrenergic, alpha / Q000502:physiology*; D011943:Receptors, Adrenergic, beta / Q000502:physiology*; D013312:Stress, Physiological / Q000503:physiopathology*
chemical_list: D011942:Receptors, Adrenergic, alpha; D011943:Receptors, Adrenergic, beta