Yoshitaka Kaneita

Oita University, Ōita, Oita, Japan

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Publications (92)183.4 Total impact

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    ABSTRACT: We conducted a randomized controlled trial to investigate the efficacy of the sleep education program based on the principles of cognitive behavioral therapy for insomnia (CBT-I) in reducing psychological distress among workers with insomnia. Total of 130 daytime office workers in Japan with insomnia complaints were randomly assigned to an intervention or to a control group. Intervention consisted of a 60 min group session and a 30 min individual session for sleep hygiene, stimulus control, sleep restriction, and relaxation training. The occupational health physician of the workers’ office led both sessions. The primary outcome was change in the K6 score for psychological distress between baseline and 3 months after the intervention. The secondary outcome was change in severity of insomnia measured with the insomnia severity index (ISI). Data were analyzed using linear mixed models with baseline value as covariates. A subgroup analysis was conducted among participants with clinically significant psychological distress at baseline (K6 score ≥5). Intention-to-treat (ITT) analysis with multiple imputation showed that the effect size of the intervention was very small (0.10 for psychological distress and 0.20 for insomnia, respectively). However, subgroup analyses of high-stress individuals showed significant improvement in psychological distress (effect size = 0.37) and insomnia (effect size = 0.39). Our results suggest that 90 min sleep education program based on CBT-I principles led by an occupational health physician alleviated psychological distress in workers with insomnia complaints and high stress levels. Brief sleep education can be widely implemented to reduce distress in workers with insomnia.
    No preview · Article · Dec 2015 · Sleep and Biological Rhythms
  • Ryuji Furihata · Yoshitaka Kaneita · Maki Jike · Takashi Ohida · Makoto Uchiyama
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    ABSTRACT: • We analyzed the data of the Japanese general adult population survey to investigate napping habits.
    No preview · Article · Dec 2015
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    ABSTRACT: No nationally representative survey of irritable bowel syndrome (IBS) among adolescents has ever been performed in Japan. In the present study, we aimed to clarify the prevalence of IBS among Japanese adolescents and the factors associated with it. The items related to the diagnostic criteria for IBS based on the Rome III Diagnostic Criteria for Functional Gastrointestinal Disorders was included in a cross-sectional nationwide survey of 'alcohol consumption and smoking habits among junior and senior high school students'. The participating schools were sampled from among all junior and senior high schools in Japan using the cluster sampling method, and self-administered questionnaires were sent to the selected schools by mail. Among 99,416 questionnaires that were collected, data from 98,411 valid responses were analyzed. The results showed that the prevalence of IBS was 18.6%. Although no sex difference was observed in the overall prevalence of IBS, the prevalence of diarrhea-predominant IBS was higher among boys than among girls, and the prevalence of constipation-predominant IBS was higher among girls than among boys. The prevalence of IBS increased with progression of the school grade, and there were the significant relationships between IBS and sleep-phase delay and insomnia symptoms. IBS was also significantly associated with poor mental health status. These results indicate that IBS is common among junior and senior high school students, and associated with lifestyle and mental health. This article is protected by copyright. All rights reserved.
    No preview · Article · Apr 2015 · Journal of Gastroenterology and Hepatology
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    ABSTRACT: Recent epidemiological studies have documented that depression is associated with short sleep duration, which may be interpreted as a consequence of comorbid insomnia and/or that of curtailment of time in bed (TIB). However, none of the studies examined association between depression and TIB. Here, we study TIB, short sleep duration and depression in the Japanese general adult population. Cross-sectional surveys with a face-to-face interview were conducted in 2009 as part of the Nihon University Sleep and Mental Health Epidemiology Project (NUSMEP). Data from 2532 individuals were analyzed. The Center for Epidemiologic Studies Depression Scale (CES-D) was used to assess the prevalence of depression with a cut-off point of 16. Sleep habits and sleep problems during the previous month, including bed time, getting up time, sleep duration, insomnia symptoms, and hypnotic medication use were evaluated. TIB was calculated from bed time and getting up time. The prevalence of depression identified with CES-D was 6.0% in total samples, 5.1% in men and 6.7% in women. Multiple logistic regression analysis revealed that both short sleep duration (<6 h) and short TIB (<6 h) were significantly associated with CES-D depression after adjusting for the confounding effects of sociodemographic variables, insomnia symptoms, and hypnotic medication use. We postulate that TIB, a modifiable sleep habit, may be an important target for improvement of sleep hygiene as a means of preventing depression.
    No preview · Article · Apr 2015 · Sleep and Biological Rhythms
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    ABSTRACT: This study sought to clarify the prevalence and associated factors of subjective fatigue symptoms, by analyzing epidemiological data for a sample of the Japanese population. Data from 1224 individuals (539 men and 685 women) aged ≥20 years were subsequently analyzed. Prevalence of fatigability was 17.2% (n = 211) and that of residual fatigue was 13.6% (n = 167), with women showing significantly higher prevalence of both symptoms than men (fatigability: men 12.6% vs women 20.9%, χ2 = 14.43, P = 0.001; residual fatigue: men 10.0% vs women 16.5%, P = 0.001). Multivariate logistic regression analyses revealed that being female, nonrestorative sleep, decreased quality of life, and stress showed significant positive associations with fatigability and residual fatigue. However, a significant positive association was found between depressed mood and fatigability, and short sleep duration and long working hours (≥9 h) were specifically significantly positively associated with residual fatigue. Sleep hygiene instruction and a psychiatric approach are needed to reduce fatigue in the Japanese population.
    Full-text · Article · Apr 2015 · Sleep and Biological Rhythms
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    ABSTRACT: The purposes of this study were to evaluate the mental health status of Japanese medical students and to examine differences based on gender, as well as on university type and location, using the results of a nationwide survey. Between December 2006 and March 2007, we conducted a questionnaire survey among fourth-year medical students at 20 randomly selected medical schools in Japan. The data from 1,619 students (response rate:90.6%;male:1,074;female:545) were analyzed. We used the Japanese version of the 12-item General Health Questionnaire (GHQ-12) to measure mental health status. Poor mental health status (GHQ-12 score of 4 points or higher) was observed in 36.6% and 48.8% of the male and female medical students, respectively. The ratio of the age-adjusted prevalence of poor mental health status in female versus male medical students was 1.33 (95% confidence interval:1.10-1.62). The universities were categorized into two groups based on the university type (national/public:15 vs. private:5) or location (in a large city:7 vs. in a local city:13 cities). The prevalence of poor mental health status in both men and women differed between these groups, although not significantly. The GHQ-12 scores in men significantly differed between the categorized groups of universities. These results suggest that adequate attention must be paid to the mental health of medical students, especially females, and that a system for providing mental health care for medical students must be established in the context of actual conditions at each university.
    No preview · Article · Dec 2014 · Acta medica Okayama
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    ABSTRACT: Background Unhappiness at school is one of the main reasons for truancy among adolescents. In order to assess this problem more thoroughly in the context of Japanese adolescents, the present study examined the associations between feelings of unhappiness at school and lifestyle habits, school life realities, and mental health status. Method This study was designed as a cross-sectional survey. A self-administered questionnaire was provided to students enrolled in randomly selected junior and senior high schools throughout Japan. We calculated the percentages of both junior and senior high school students who felt unhappy at school based on factors related to school life, lifestyle habits, and mental health status. Multiple logistic regression analyses were performed in order to examine the associations between those factors and students' feelings of unhappiness at school. Results A total of 98,867 valid responses were analysed, 7.9% (Boys: 8.4%, Girls: 7.4%) of which came from students who responded that they felt unhappy at school. For both junior and senior high school students, the percentages of those who felt unhappy at school were significantly higher among those who had not yet decided on their future life course, who did not participate in extracurricular activities, did not eat breakfast every day, went to bed late, had used tobacco or alcohol in the previous 30 days, and had poor mental health compared with others. The results of multiple logistic regression analyses indicated that the adjusted odds ratios for feeling unhappy at school with regard to the above-mentioned factors were significantly high for both junior and senior high school students. Conclusions The present results suggest that school employees and administrators must provide health guidance to students, considering that irregular lifestyle habits, lower school engagement, smoking, drinking alcohol, and poor mental health status are all associated with maladaptation to school among adolescents.
    Full-text · Article · Nov 2014 · PLoS ONE
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    S Mihara · H Nakayama · H Sakuma · Y Osaki · Y Kaneita · S Higuchi
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    ABSTRACT: Back ground. The number of people with Internet addiction (IA) in Japan is assumed to have rapidly increased, but the actual conditions have not been unknown. Below we report the changes of estimated prevalence of IA among the adult population of Japan based on the results of the two nationwide surveys we conducted leave five years interval. Methods. Our first survey was conducted in 2008, and the subjects were 7,500 men and women. Our second survey was conducted in 2013, and the subjects were 7,052 people. Both of the two survey, the subjects were selected from the entire adult population of Japan by stratified two-stage random sampling. In addition to the Japanese version of the Internet Addiction Test (IAT), tests to assess other addictions and questions on socio-familial background were included in the survey. Results. In the first survey, 51% of the replied that they used the Internet, and 20% scored 40 or higher on the IAT. We estimated the number of adullts with IA tendency was 2.7million in Japan. Problem users were more prevalent in the younger generation and tended to have a higher education level. The second survey revealed a much higher prevalence of IA than the first survey.We estimated the number of adullts with IA tendency was 4.21million in Japan. Conclusion. The results of our two surveys of IA in Japan suggested that problems associated with IA have already become serious, and the development and implementation of strategies to prevent and control problems associated with IA is an urgent task.
    Preview · Article · Sep 2014 · Alcohol and alcoholism (Oxford, Oxfordshire). Supplement
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    ABSTRACT: The purpose of this study was to examine the associations of sleep complaints, such as insomnia and snoring, with metabolic syndrome. Data from a national study conducted on residents from randomly selected districts in Japan in 2007 were used. The survey included: (i) information on physical status, (ii) dietary intake, and (iii) a questionnaire on lifestyle characteristics. Data on physical status and lifestyle characteristics available for 3936 adults (1592 men and 2344 women) were analyzed. Multiple logistic regression analysis yielded statistically significant associations. Adjusted odds ratios calculated with reference to metabolic syndrome were 1.23 (95% CI: 1.03–1.48, P = 0.02) for insomnia and 1.89 (95% CI: 1.56–2.30, P < 0.01) for snoring. For insomnia, the adjusted odds ratio in relation to hypertension was 1.28 (95% CI: 1.08–1.52, P < 0.01), and for snoring, the adjusted odds ratios in relation to abdominal obesity and dyslipidemia were 1.90 (95% CI: 1.60–2.26, P < 0.01) and 1.50 (95% CI: 1.27–1.77, P < 0.01), respectively. Metabolic syndrome was found to be closely associated with insomnia and snoring. Such associations should be taken into consideration when developing measures against metabolic syndrome and sleep problems.
    Preview · Article · Jul 2014 · Sleep and Biological Rhythms
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    ABSTRACT: We conducted an epidemiological study to examine the associations between sleep environments and sleep habits in Japanese adolescents. The targets were students attending junior and senior high schools throughout Japan. Sample schools were selected by cluster sampling. Self‐reported anonymous questionnaires were then sent to the schools for all students to complete. A total of 99 416 adolescents responded, with an overall response rate of 64.0%. A total of 96 861 questionnaires were subjected to analysis. Associations between sleep environments (type of bed, lighting during sleep, sharing a bedroom) and sleep duration, bedtimes, wake‐up times, sleep quality, or symptoms of insomnia were examined. In total, 65.5% of the adolescents surveyed slept on a bed, and 33.0% slept on a futon laid on the floor or tatami. In total, 66.6% slept with the light off, 31.0% slept with a dim light on, and 2.0% slept with the light on. Of those surveyed, 69.3% had their own bedrooms, 17.1% shared a bedroom with one other person, 8.0% shared a bedroom with three people, and 5.0% shared a bedroom with four people or more. The factors with high odds ratios with regard to insomnia were use of a futon laid on the floor or tatami, sleeping with the light on, and not sharing a bedroom. Sleep environments are associated with insomnia. Type of bed, lighting, and sharing a bedroom should be considered as factors that affect the sleep of adolescents.
    No preview · Article · Apr 2014 · Sleep and Biological Rhythms
  • Yoshitaka Kaneita

    No preview · Article · Apr 2014 · Sleep and Biological Rhythms
  • Maki Ikeda · Yoshitaka Kaneita
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    ABSTRACT: Sleep disturbance such as insomnia is one of common complaint among adults in developed countries. Insomnia induces sleepiness and drowsiness, resulting in a reduction of working efficiency in the daytime. Drivers in the transportation system and machine operators could cause serious industrial accidents if they have sleep disturbances. Recent studies reported that approximately 20% of Japanese population had sleep disturbances. Here we provide a general account of sleep disturbance about Japanese population.
    No preview · Article · Mar 2014 · Nippon rinsho. Japanese journal of clinical medicine
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    ABSTRACT: The aim of the present study was to clarify the prevalence of excessive daytime sleepiness and its associated factors among pregnant women in Japan. Of the 940 randomly selected survey locations identified by the Japan Association of Obstetricians and Gynecologists, 344 obstetric institutions participated in the survey. The study was conducted on women with confirmed pregnancies who had had a second or subsequent consultation at one of these institutions. The survey items included age, highest educational achievement, trimester of pregnancy, number of pregnancies, employment status, smoking, alcohol consumption, restless sleep, difficulty initiating sleep, difficulty maintaining sleep, early morning awakening, sleep duration, napping, snoring or breathlessness, and restless leg syndrome. The Epworth Sleepiness Scale was used to assess the level of excessive daytime sleepiness. We calculated the prevalence of excessive daytime sleepiness and then examined its associated factors using χ2 test and multiple logistic regression analysis. The prevalence of excessive daytime sleepiness among pregnant women was 6.2%. The results of multiple logistic regression analysis indicated that the adjusted odds ratio with regard to excessive daytime sleepiness was significantly higher among younger women and those in an earlier trimester of pregnancy. The odds ratio with regard to excessive daytime sleepiness was also significantly higher for women in their first pregnancy, full-time workers, and current alcohol consumers. Women indicating the presence of sleep-related issues, including restless sleep, difficulty maintaining sleep, napping, snoring or breathlessness, and symptoms of restless leg syndrome, reported significantly higher levels of excessive daytime sleepiness.
    No preview · Article · Jan 2014 · Sleep and Biological Rhythms
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    ABSTRACT: Background: In order to control the purchase of tobacco by minors from vending machines in Japan, an age verification card system (TASPO) was introduced in 2008. Objective: We investigated serial changes in the amount of tobacco purchased to determine the effectiveness of the age verification card system after performing a nationwide survey of smoking among junior and senior high school students in Japan. Methods: This survey was conducted in 2008 and 2010. We asked 98,867 junior and senior high school students, aged 13-18 years, in Japan about their smoking behavior, where they purchased cigarettes, whether they had used age verification cards, and if so, how they obtained them. Results: Comparison of the results of the 2008 and 2010 surveys indicated that the number of adolescents who bought cigarettes by unlawful use of age verification cards was on the increase. They obtained age verification cards by the following means: (1) taking one that belonged to a senior family member, (2) borrowing one from a family member, (3) borrowing one from someone other than a family member, and (4) obtaining one through the usual application procedure, of which the most-used means was (3). All of these methods were used more often in 2010 than in 2008. Conclusions: It is suggested that the age verification card system in Japan is becoming less effective at inhibiting the purchase of tobacco by minors.
    No preview · Conference Paper · Nov 2013
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    ABSTRACT: In this study, we attempted to clarify the associations between various sleep disturbance symptoms and the frequency and amount of alcohol use among Japanese adolescents. This study was designed as a cross-sectional sampling survey. A self-administered questionnaire survey was administered to students enrolled in randomly selected junior and senior high schools throughout Japan. A total of 99,416 adolescents responded, and 98,867 questionnaires were subjected to analysis. The prevalence rates of sleep disturbance in the 30 days preceding the day of the survey were as follows: subjectively insufficient sleep (SIS) (boys: 37.6%, girls: 38.7%); short sleep duration (SSD) with less than 6 h of sleep (boys: 28.0%, girls: 33.0%); difficulty initiating sleep (DIS) (boys: 12.5%, girls: 14.1%); difficulty maintaining sleep (DMS) (boys: 10.1%, girls: 10.9%); and early morning awakening (EMA) (boys: 5.1%, girls: 5.0%). Adolescents reporting one or more symptoms of DIS, DMS, and EMA were classified as having insomnia, and its prevalence was 21.5%. The prevalence of each symptom of sleep disturbance increased significantly with the number of days on which alcohol was consumed in the previous 30 days and the amount of alcohol consumed per drinking session (p < 0.01). Multiple logistic regression analyses showed that the adjusted odds ratio (AOR) for each symptom of sleep disturbance, except SIS and EMA, tended to increase with the number of days on which alcohol was consumed and the amount of alcohol consumed per drinking session. The prevalence of sleep disturbance is particularly high among adolescents drinking alcohol. The risk of having each symptom of sleep disturbance, except SIS and EMA, increases with the number of days on which alcohol was consumed and the amount of alcohol consumed per drinking session. These findings reconfirm the need to eliminate underage drinking to ensure good sleep among adolescents.
    No preview · Article · Oct 2013 · Alcohol (Fayetteville, N.Y.)
  • Y. Kaneita · T. Ohida · S. Imamura · M. Ikeda · O. Itani
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    ABSTRACT: The World Health Organization has advocated that physicians, as models of a healthy lifestyle, should not smoke and that they should not give tacit approval to patient smoking. Moreover, physicians' guidance on smoking cessation has been reported to have a major effect on patients' smoking behavior, and physicians' stance on smoking prevention is regarded highly. Accordingly, the Japan Medical Association has been conducting a nationwide cross-sectional survey every four years to learn its members' smoking behavior and awareness and attitudes toward smoking. In the four surveys conducted thus far, the smoking rate among male physicians underwent a statistically significant decline from 27.1% in 2000 to 21.5% in 2004, 15.0% in 2008, and 12.5% in 2012. The smoking rate among female physicians also underwent a statistically significant decline from 6.8% in 2000 to 5.4% in 2004, 4.6% in 2008, and 2.9% in 2012. In terms of the transition in the smoking rate by medial specialty, the smoking rate among male physicians decreased significantly in all medical specialties. Among female physicians, a statistically significant decline was seen in the smoking rate among internists and pediatricians.
    No preview · Article · Jul 2013
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    ABSTRACT: Objectives: This study aimed to clarify the association between long working hours and short sleep duration among Japanese workers. Methods: We selected 4,000 households from across Japan by stratified random sampling and conducted an interview survey of a total of 662 participants (372 men; 290 women) in November 2009. Logistic regression analyses were performed using "sleep duration <6 hours per day" as a dependent variable to examine the association between working hours/overtime hours and short sleep duration. Results: When male participants who worked for ≥7 but <9 hours per day were used as a reference, the odds ratio (OR) for short sleep duration in those who worked for ≥ 11 hours was 8.62 (95% confidence interval [CI]: 3.94-18.86). With regard to overtime hours among men, when participants without overtime were used as a reference, the OR for those whose period of overtime was ≥ 3 hours but <4 hours was 3.59 (95% CI: 1.42-9.08). For both men and women, those with long weekday working hours tended to have a short sleep duration during weekdays and holidays. Conclusions: It is essential to avoid working long hours in order to prevent short sleep duration.
    No preview · Article · May 2013 · Journal of Occupational Health
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    ABSTRACT: Objective: The main objective of our study was to clarify the prevalence of disorders of arousal (confusional arousals, sleepwalking, sleep terrors) and sleep-related bruxism (teeth grinding) and their associated factors among Japanese adolescents. Methods: Our study was designed as a cross-sectional sampling survey. The targets were students attending junior and senior high schools throughout Japan. The questionnaire asked for personal data and information on lifestyle, depressive state, and sleep status including the frequency of experiencing disorders of arousal and sleep-related bruxism. Results: A total of 99,416 adolescents responded. The overall response rate was 63.7%, and 98,411 questionnaires were subjected to analysis. The prevalence of disorders of arousal was 7.1% (95% confidence interval [CI], 6.9-7.3%) among boys and 7.7% (95% CI, 7.5-7.9%) among girls. The prevalence of sleep-related bruxism was 2.3% (95% CI, 2.2-2.4%) among boys and 3.0% (95% CI, 2.8-3.2%) among girls. The factors associated with disorders of arousal were the grade in school, smoking habit, alcohol consumption, naptime (min), breakfast habit, participation in club activities, sleep duration, difficulty initiating sleep, nocturnal awakening, early morning awakening, subjective sleep assessment, snoring, decrease in positive feelings, and depression (all p<.001). The factors associated with sleep-related bruxism were gender, smoking habit, nocturnal awakening, snoring, early morning awakening, decrease in positive feelings, and depressive feelings (all p<.001). Conclusions: If disorders of arousal or sleep-related bruxism are observed in an adolescent, his or her smoking habit, alcohol consumption, sleep status, and depressive state should be considered.
    No preview · Article · May 2013 · Sleep Medicine

  • No preview · Article · Jan 2013 · Health
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    ABSTRACT: Objectives: The aim of study was to determine the associations of work hours and actual availability of weekly rest days with the onset of lifestyle-related diseases such as obesity, hypertension, hypertriglyceridemia, low levels of high-density lipoprotein (HDL) cholesterol and hyperglycemia. Methods: For this longitudinal study, we used data from checkups conducted in 1999 and 2006 for 30,194 men who worked for a local public institution in Japan. We calculated the cumulative incidence rates of onset of obesity, hypertension, hyperglycemia, hypertriglyceridemia and low HDL cholesterol over this 7-year period and performed a χ2 test to determine the association between the above diseases and work conditions (work hours and actual availability of weekly rest days) at the time of the baseline survey. We then performed multiple logistic regression analysis of the diseases that showed significant associations. Results: The adjusted odds ratio for the onset of hypertriglyceridemia in subjects who worked ≥9 hours was high (1.11 [95% CI: 1.02-1.22], p=0.02) in comparison with those who worked <9 hours. The adjusted odds ratio for the onset of hypertriglyceridemia in subjects who could not often take weekly rest days was high (1.13 [95% CI: 1.01-1.27], p=0.03) in comparison with those who were able to take most of the available weekly rest days off work. Conclusions: These results show that work hours and actual availability of weekly rest days independently predict the onset of hypertriglyceridemia. Working only regular hours and taking advantage of weekly rest days can contribute to the prevention of hypertriglyceridemia.
    No preview · Article · Nov 2012 · Journal of Occupational Health

Publication Stats

1k Citations
183.40 Total Impact Points

Institutions

  • 2013-2015
    • Oita University
      • Faculty of Medicine
      Ōita, Oita, Japan
  • 2005-2012
    • Nihon University
      • Department of Public Health
      Edo, Tokyo, Japan
  • 2011
    • National Center of Neurology and Psychiatry
      • Department of Psychophysiology
      Edo, Tōkyō, Japan