Shoji Nagata's research while affiliated with University of Occupational and Environmental Health and other places
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Publications (58)
Slow diaphragmatic breathing is one of the therapeutic methods used in behavioral therapy for panic disorder. In practice, we have noticed that some of these patients could not perform diaphragmatic breathing and their percent vital capacity was initially reduced but could be recovered through breathing training. We conducted a comparative study wi...
We examined the effects of intracerebroventricular (i.c.v.) administration of colchicine on the expression of the arginine vasopressin (AVP)-enhanced green fluorescent protein (eGFP) fusion gene in rats. In rats administered i.c.v. vehicle (control), eGFP fluorescence was observed in the supraoptic nucleus (SON), the magnocellular division of the p...
We practiced interventional approaches for the promotion of occupational mental health in a manufacturing company with approximately 2,000 workers, between 2005 and 2007. We investigated the long-term effects of our mental health training program--including Active Listening (AL) training for managers--on perceived job stressors, stress reactions an...
The aim of this study was to investigate whether changes in urinary 8-hydroxydeoxyguanosine (8-OH-dG), an oxidative stress indicator, occur or not, and how psychological reactions change, after one night of sleep deprivation (SD) and after 7 hour recovery sleep opportunities during three recovery days. Twenty healthy subjects participated in this s...
The aim of this study was to investigate how subjective sleepiness, mood states, simple and high-order cognitive performance change after one night of sleep deprivation (SD) and recover to after 7 h normal recovery sleep opportunity during three recovery days.
Ten healthy subjects participated in this study. We measured their subjective sleepiness,...
To develop tools offering definite orientation for managers and employees to support their work improvement through occupational mental health. This research was a part of the Mental Health Improvement & Reinforcement Study (MIR study), conducted from October 2004 to March 2006.
We developed a trial version named the Kaizen Check List (KCL) by refe...
We carried out mental health training with Active Listening for managers of A company, which was the electronics manufacturing company with 1,900 employees. The purpose of the present study was to examine the effect on managers and employees in the workplace on the training. The subjects were all persons who managed regular employees directly in A...
Mental health of workers in Japan has become one of the most serious health problems in the workplace. To tackle this problem, the Ministry of Health, Labour and Welfare set guidelines for promoting mental health of workers in 2000, in which every worker was recommended to learn autogenic training (AT) from the standpoint of “self-care”. Before the...
We investigated relationship between job stress and self-rated health among Japanese nese full-time occupational physicians (OPs).
In 2000, we mailed self-administrated questionnaires to 716 OPs. Of these OPs, 349 (49%) returned sufficiently completed questionnaires for analyses. oblique-rotated principal factor analysis of the job stress questionn...
The solution-focused approach (SFA) developed by Insoo Kim Berg and Steve de Shazer at the Brief Family Therapy Center, Milwaukee, USA is classified as brief psychotherapy. We believe that SFA can give an occupational healthcare staff useful tools that will positively influence their relationships with workers, because it focuses on workers' streng...
The present study explored the relationship between turnover and periodic health check-up data among Japanese hospital nurses. The subjects were 379 registered nurses in a Japanese hospital and the duration of our study period was three years. By the proportional hazard model, we investigated the relative risks (RRs) of the turnover rate associated...
The present study investigated the relationship between an interview-based health promotion program and cardiovascular risk factors at manufacturing companies. Excluding insufficient data and the workers who took medication prescribed by a physician in 1993, the subjects were six hundred and twenty-nine 18-55-yr-old employees who had been working a...
To investigate the relationship between overtime working and self-reported low productivity due to poor health over the course of 1 year.
The subjects were 94 random-sampled workers at a Japanese manufacturing company. The data on sickness absence and low productivity due to poor health were collected by self-report questionnaires every month from...
The present study was conducted to clarify the direct effects of active listening (AL) training given to middle managers in a local government. Altogether, 345 middle managers participated in 13 AL training sessions over two years. We developed the Inventive Experiential Learning (IEL) method, and used it as the central training method in this stud...
To clarify the possibility of pharmacological mediation on classical conditioning-associated asthmatic response, the effect of diazepam on an odor-induced conditioned histamine release was investigated in ovalbumin (OA)-sensitized guinea pigs, i.e. a model of bronchial asthma. The animals received conditioning sessions in which an antigen (OA) as t...
The present study investigated relationships among self-management skills, communication with superiors, and the mental health of employees in a Japanese worksite. The subjects were manufacturing workers in a medium-sized company in Kyushu. In 1999, we mailed a self-administrated questionnaire which included questions on age, gender, job rank, comm...
We investigated relationships among self-efficacy, self-management skills, communication with superiors and mental health of employees at a Japanese workplace. The subjects were 426 employees in a medium-sized manufacturing company in Kyushu. In 1999, with agreement of the company, we mailed a self-administrated questionnaire which included questio...
The present study investigated the relationship between coping skills and job satisfaction among Japanese full-time occupational physicians (OPs).
In 2000 we mailed self-administered questionnaires to 716 full-time OPs who were members of "Sanyu-kai", the only Japanese association of full-time OPs. The questionnaires included age, gender, marital s...
We investigated the relationship between burnout and communication skill training among Japanese hospital nurses to improve the mental health of human service workers. The subjects were forty-five registered nurses referred to a self-expression skill intervention program by their section superiors, with each superior choosing from two to five nurse...
Nocturnal airway narrowing is a common characteristic of asthma that remains poorly understood. Sleep itself or rapid eye movement (REM) sleep has been suspected to play a role in the etiology of nocturnal asthma; however, only inconsistent findings have so far been produced. The purpose of this study was to examine the effect of sleep deprivation,...
This study examined trends of sickness absence before and after a psychosocial-approached health promotion program (HPP) at a Japanese worksite. The subjects were 1029 male employees working at a manufacturing company from April 1991 to March 1999. The HPP was performed from April 1995 to decrease sickness absence through helping to improve all emp...
The present study investigated the reliability and validity of the Japanese version of the Rathus Assertiveness Schedule (RAS) preparatory to study the relationship between self-expression skills and mental health status of employees at a Japanese worksite. Assertiveness is one of self-expression skills and defined as standing up for one's own righ...
It has been reported that animals exposed to prior stress exhibit enhanced, reduced or equivalent hypothalamic-pituitary-adrenal (HPA) response to a subsequent acute stressor. We demonstrated previously that a long-duration restraint stress (RTS) evoked adaptive change, characterized by transient increase and gradual recovery to basal level in c-fo...
To clarify the contribution of stress to classical conditioning-associated asthmatic responses, the effect of fasting stress on conditioned histamine release was investigated in a guinea pig model of asthma. The animals were randomly divided into 2 groups for Experiment 1 and 2, and received a conditioning procedure in which ovalbumin (OA) as an un...
To investigate the effect of abrupt or non-abrupt isolation stress on the classical conditioned histamine release, socially isolated or paired guinea pigs underwent conditioning procedures in which ovalbumin (OA) as an unconditioned stimulus (US) and dimethylsulfide (sulfur smelling) as a conditioned stimulus (CS) were simultaneously inhaled, and t...
Job Stress among Japanese Full-time Occupational Physicians: Takashi SHIMIZU, et al. Occupational Health Training Center, University of Occupational and Environmental Health—The present study investigated job stress and the factors influencing job stress among Japanese full-time occupational physicians (OPs). In 2000 we mailed self- administrated q...
It is well known that stress affects the central nervous system (CNS), neuroendocrinoimmune system and other peripheral organs such as the gastrointestinal tract. However, the process of adaptation or recovery after acute stress reactions in these systems or organs during prolonged stress has not yet been adequately investigated. To clarify the pro...
We have examined the effects of 3 weeks of food restriction on both the activity of neurons containing hypothalamic orexin (OX)-A and the level of OX receptor type 2 (OX2R) mRNA in the paraventricular nucleus (PVN) of rats. Double immunohistochemistry was used to examine the expression of OX-A and Fos in the lateral hypothalamic area (LHA), and in...
The present study investigates whether the formation of 8-hydroxydeoxyguanosine (8-OH-dG), a known oxidative DNA damage relevant to carcinogenicity, can be associated with psychological factors, in order to clarify the possible stress-cancer linkage from a genetic viewpoint.
We performed a cross-sectional study in which we examined the relationship...
Although previous studies have found that electrolytic lesions of the anterior hypothalamic area (AHA) resulted in the suppression of anaphylaxis, their effect on late allergic responses has scarcely been investigated. To clarify the role of the AHA on possible late asthmatic responses, including their neuroendocrinological mechanisms, we examined...
Nociceptive stimulation causes neuroendocrine responses such as arginine vasopressin (AVP) release and activation of the hypothalamo-pituitary-adrenal (HPA) axis. We examined the effects of nociceptive stimulation on the expression levels of neuronal nitric oxide synthase (nNOS) mRNA, heteronuclear (hn)RNA for AVP and AVP mRNA in the rat paraventri...
The present study was performed to investigate the relationship between work-related factors, including psychological stress, and the formation of a type of oxidative DNA damage, 8-hydroxydeoxyguanosine (8-OH-dG), in order to examine their possible risk factor for occupational carcinogenesis.
A total of 54 healthy workers (27 male and 27 female, ag...
Many clinical and experimental data have shown that learning can occur under general anesthesia. To clarify this possibility with respect to allergic reactions, particularly asthmatic responses, we first established classical conditioned histamine release in response to a neutral odor by using pairings of the odor and an inhaled antigen for five se...
Although numerous studies have been carried out on the stress-cancer linkage, the results are still inconclusive. One of the useful, but rarely applied, methods to assess this linkage is to examine the relationship between psychosocial stress and cancer-predisposing genetic alterations simultaneously. We investigated whether various psychosocial fa...
The globalization of the economy and the recent economic recession in Japan has accelerated down-sizing or restructuring of corporations and has resulted in the induction of a wage system according to achievement instead of the traditional seniority wage system, break-down of the life-long employment system, excess labor and increased unemployment....
This study investigated whether the formation of 8-hydroxydeoxyguanosine (8-OH-dG), a known oxidative DNA modification relevant to carcinogenicity, can be classically conditioned to a novel taste in order to clarify the possible role of the central nervous system (CNS) or psychological stress on cancer initiation via a classical conditioning mechan...
The purpose of this study was to examine the risk of Legionella pneumophila (Lp) infection due to the use of a 24-h hot water bath (24HHWB), which is popular for bathing in Japan because of its water conservation through the use of recycled bath water, and to investigate other possible factors that may be associated with Legionella infection. The r...
Interpersonal relationships are widely recognized as a major source of job stress, and a mental health training program that incorporates active listening (AL) has attracted much attention in Japan. However, few methods are available to assess the attitude of AL easily. To develop a new questionnaire that can measure workers' person-centered attitu...
Urocortin-like immunoreactivity (Ucn-LI) in the supraoptic nucleus (SON) of young and adult rats was examined. The number of Ucn-LI neurons in the SON in adult male Wistar rats (8, 12 and 18 months old) was significantly increased in comparison with that in the SON of young male rats (7 weeks old). In addition, immunopositive fibers in the SON of a...
Three factors in recent medical research and treatment (advances in the field of psychoneuroimmunology, epidemiological evidence regarding important interaction between psychosocial factors and development of disease, and the recognition of the importance of patient education for self-management of asthma) have led clinicians and researchers to rec...
The present study aimed to determine the psychophysiological changes induced in subjects by standard autogenic training (AT). Physiological measurements were taken under strict experimental conditions.
Thirty-one healthy students were divided randomly into two groups: the AT group and the control group. In the first session, the physiological varia...
A self-administered questionnaire study of 333 workers (male 253, female 80) in a manufacturing company was carried out one month after informing the workers of the results of their medical checkups in 1993. The questionnaire included several items such as recalled abnormal findings of health examination and ways of overcoming the abnormal findings...
The purpose of the present study was to examine the measurement properties of positive affect items among the Japanese population.
Responses to the Japanese version of the Center for Epidemiologic Studies Depression Scale and four additional negatively revised items of the original positive affect items were compared for 85 Japanese psychiatric out...
In order to clarify the effects of walking under various psychosocial and occupational conditions on psychophysiological health, we examined the relationship between the number of steps walked in several situations, such as on all weekdays, at work, and over the weekend, and the results of medical checkups, psychological tests, Breslow's 7 health p...
To investigate the usefulness of a periodic medical checkup at the workplace from the standpoint of remembering the results, a survey was performed by a self-rating questionnaire on 424 industrial workers in a certain manufacturing company. The questionnaire included several items, such as their recalled abnormal medical findings and follow-up towa...
In order to investigate the relationship between health practices, various psychosocial factors, and mental health, a survey was conducted by means of a self-rating questionnaire on 424 industrial workers. The questionnaire included items concerning Goldberg's 12 selected items from the Japanese version of the General Health Questionnaire, the Type...
In order to examine the psychophysiological effect of first-time Autogenic training (AT), thirty-seven healthy subjects (Males 32, Females 5) who had never experienced AT practiced it with a taperecorder. The effect of this training was evaluated from the standpoint of objective skin temperature by using a thermography, subjective anxiety (STAI) an...
Many workers and health professionals consider that mental health at the workplace is very important in order to maintain workers' health. To improve their mental health, evaluating stress at the workplace and planning adequate stress management are necessary. This report deals with these two areas. 1. A survey on occupational stress in local gover...
A 12-week training period including exercise and diet was undertaken to determine the effects of a newly developed health program on the physical and phychological parameters in 24 obese employees of a certain company. The association between a number of somatic parameters and psychological variables, including the attitude toward better health, an...
In order to support a smooth reinstatement in the workplace, the factors influencing reinstatement were investigated in 51 cases with 'return to work' difficulties in 12 hospitals which have a psychosomatic care unit. The disorders considered as main triggers of absenteeism in these cases were depression or depressive state (22), anxiety neurosis (...
Two hundred and ninety nursing students were examined using a questionnaire regarding their interest in and understanding of patients' mental state, interest in terminal care and hope of practicing it, their ways of thinking in relation to artificial prolongation of life and giving cancer information to other persons, family members or receiving it...
Although the "Total Health Promotion Plan (THP)" drawn up by the Labor Ministry includes a self-administered stress checklist (THP-SC) as a health measurement, THP-SC has not been utilized in the way that it had been planned. Hence, we studied the usefulness of this list by comparing it with the General Health Questionnaire (GHQ). We made a questio...
Citations
... Further, job satisfaction was inversely associated with a lower GHQ-12 score, suggesting that higher job satisfaction was related to fewer self-reported mental health challenges. This has also been demonstrated by previous studies among populations such as factory workers in the south of Thailand [26], teachers in Marand, Iran [10], school teachers in Japan [11], secondary school teachers in southeast Nigeria [12], and local civil servants in Japan [27]. ...
... Recent investigations have highlighted the close interplay between respiration and emotional states, notably anxiety and stress, alongside their broader implications for overall well-being [1][2][3]. As a response, targeted interventions have emerged, entailing elements of respiratory intervention, demonstrating notable associations with changes in respiratory pattern variability (RPV), particularly during heightened stress periods [4][5][6]. A new training has been developed by RK and VZ within the DFG-funded study "Bewusstes AtemTraining" (BAT) with a focus on RPV. ...
... Considering the above, we suggest that the SAMY level can be used as an index of the change in autonomic activity caused by continuation of AT in patients with FSS. Although many studies have used psychophysiological measures such as the heart rate, skin conductance, and TEMP to measure changes in autonomic activity caused by AT (e.g., [19,47,49,[51][52][53]), we argue that the SAMY level was also useful as an index of the changes in sympathetic activity in our previous study [28]. In the present study, we argue that the SAMY level is related to both physical and psychological effects of AT in patients with FSS. ...
... More so, Barish, (2001) discovered that in some cases these fatalities are caused by other individuals in the workplace as opposed to inanimate working objects and conditions. Although Weiss, (1999) and Hills et al., (2013) studied "workplace condition" within the context of teaching and medicine, it is considered as an influential component in the business environment as well (Mishima, Goto, Kubota & Nagata, 2006;Cottini, Kato & Westergaard-Nielsen, 2011) ...
... The higher the score, the stronger the loneliness. The Active Listening Attitude Scale (ALAS) developed by Mishima et al. was used to assess mothers' active listening attitude [21]. The higher the score, the better the listening attitude or skill. ...
... In contrast, in a study by Shimiizo in Japan, the highest stress rates were found in the youngest group [12]. According to Osipow et al., life stage will reflect differences in occupational stresses and will result in differing availability of coping resources [13]. ...
... Psychological stress is a contributing factor to, amongst other health problems, cardiovascular disease (Steptoe & Kivimaki, 2012), asthma and allergy (Nagata, Irie, & Mishima, 1999), peptic ulcers (Levenstein, Rosenstock, Jacobsen, & Jorgensen, 2015), premature labor (Newton, Webster, Binu, Maskrey, & Phillips, 1979), the progression of immune-based diseases, such as HIV (Evans et al., 1997), and mortality (Jeong, Aldwin, Igarashi, & Spiro, 2015). ...
... These results demonstrate that increasing of the number of daily steps work improves or at least maintains a good levels of the serum lipids. Irie et al.[33] reported that an increased number of steps was significantly correlated with increased HDLC, and this fact supports our view. In our study, the average of the number of steps per day for the first week was about 6,500. ...
... Long working hours, for example, imply less time spent with family and friends, with whom a greater proportion of social capital is accumulated. According to studies, poor working conditions and increased occupational stress are significant predictors of poor self-rated health [33][34][35]. The combination of these factors is expected to result in poor self-rated health. ...
... On the other hand, the connection between skills and job satisfaction has been examined in various studies. In a study by Shimizu and Nagata (2003), the focus was on investigating the correlation between coping skills and job satisfaction among full-time occupational physicians in Japan. 2020) assessed the relationships between job involvement, job satisfaction, and the mediating role of professional skill utilization. ...
