Episodic stress associated with writing a graduation thesis and free cortisol secretion after awakening.

Cortisol secretion after awakening, an index of hypothalamus-pituitary-adrenal axis activity, appears to be related to psychosocial stressors, or to symptoms caused by psychosocial stressors. The relationship between the quality, duration, and magnitude of psychosocial factors and cortisol secretion is however, unclear. Therefore, the effect of episodic stress associated with writing a graduation thesis on cortisol secretion after awakening was investigated. Saliva samples were collected from 10 undergraduate students at awakening, and 30, 45, and 60 min after awakening 1 month, 2 weeks, and a few days before the thesis submission and 1 week after the submission. They also completed the Short form of Profile of Moods Scale (POMS-S) on the night before each sampling. Results indicated that cortisol levels were higher a few days before the thesis submission compared to 1 month before submission. Scores of "Fatigue" and "Tension-Anxiety" in POMS-S were also higher a few days before submission. These results suggest that episodic stress associated with writing a graduation thesis caused an increase in cortisol levels after awakening.

[Effect of hostility on salivary cortisol levels in university students].

The influence of hostility on cortisol levels in saliva was investigated in 47 university students (27 males and 20 females). The students were divided into high and low hostility groups by cluster analyses based on their scores on the Buss-Perry Aggression Questionnaire and the Müller Anger Coping Questionnaire. Their saliva was collected twice, in the morning immediately after awakening at a two week interval. On the day before saliva collection, they completed questionnaires about stressful events and their moods in the previous two weeks. The results of the ANOVA showed higher cortisol levels and higher frequencies of stressful events and negative moods in the high hostility group. The effect of hostility on cortisol levels was diminished by controlling for stressful events and negative moods, which suggests that stressful events and negative moods are mediators between hostility and cortisol. The results are discussed in relation to the association between hostility and coronary heart disease.

[Study on self and other ratings of hostility].

The purpose of this study was to investigate the validity of hostility ratings made by others. The rating measure was considered essential for the study of correlation between hostility and coronary heart disease. Undergraduate and graduate students, 81 in all, completed a questionnaire of hostility and social desirability. The scales included were Buss-Perry Aggression Questionnaire (BAQ), Müller Anger Coping Questionnaire (MAQ), and Marlowe-Crowne Social Desirability Scale (MCSD). Acquaintances also rated them using BAQ and MAQ. Correlations between self and other ratings were moderate, and self-rated hostility scores correlated negatively with MCSD scores, while other-rated hostility scores did not. Results of ANOVA indicated that self-rated hostility scores were higher than other-rated hostility scores. However, the differences decreased as the degree of closeness between them increased, and no difference was found in long-term close relationship. These results suggested that other ratings of hostility could be an objective measure in Japan, as in western countries.

Dimensions of hostility in Japanese undergraduate students.

Japanese undergraduate students (N = 512) completed the Japanese versions of 4 hostility questionnaires: Aggression Questionnaire (Ando et al., 1999); State-Trait Anger Expression Inventory (Suzuki & Haruki, 1994); Müller Anger Coping Questionnaire (Otake et al., 2000); and Cynicism Questionnaire (Izawa & Nomura, 2004). Dimensions of hostility, determined by factor analysis for the 12 subscales of the 4 questionnaires, revealed a 4-factor solution: Expressive Hostility, Inhibitive Hostility, Assertiveness, and Hostile Cognition. Prior studies with Western participants had suggested a 2-factor solution of Expression and Experience dimensions of hostility. However, our results forcing a 2-factor solution showed a different pattern: The first factor included Expressive Hostility and Hostile Cognition, and the second factor included Inhibitive Hostility. These results indicate that the dimensions of hostility in Japanese students differed from those in American and European participants. This may be related to characteristics of Japanese society that emphasize cooperative behavior and not expressing angry emotions.

Use of ambulatory skin conductance recording for monitoring psychophysiological arousal in the elderly staying in care facilities.

To monitor the psychophysiological arousal level in the elderly, 24 h recordings of skin conductance change (SCC) were done during their stay in care facilities. The mean and maximum SCC levels in 17 awake elderly subjects were significantly lower than those of levels in 20 healthy, young control subjects (P < 0.05 and P < 0.001, respectively). The mean SCC levels during sleep did not differ between groups. The SCC trend graph reflected a degree of daily activity. The daytime SCC profile of elderly individuals who could walk independently was comparable to that of healthy young subjects. In contrast, the SCC profile of the bedridden elderly were generally flattened with poor SCC responses that were evoked only by nursing procedures.