Isa Okajima
Dados Biográficos
| ID | 7123074 |
|---|---|
| NOME | Isa Okajima |
| PRENOMES | Isa |
| SOBRENOME | Okajima |
| ASSINATURA | OKAJIMA I |
| AFILIAÇÕES | Tokyo Kasei University |
| ORCID | 0000-0003-3494-4328 |
| VERIFICADO | Sim |
| TOTAL DE OBRAS | 19 |
| TOTAL DE CITAÇÕES | 0 |
| TOTAL COMO AUTOR | 19 |
| TOTAL COMO EDITOR | 0 |
| PRIMEIRO ANO DE PUBLICAÇÃO | 2009 |
| ANO MAIS RECENTE DE PUBLICAÇÃO | 2026 |
| ÍNDICE H | 0 |
Sleep debt and depressive symptoms among workers
Introduction This study examined whether fatigue mediates the association between sleep debt and depressive symptoms among municipal employees in Japan. Methods This cross-sectional study was conducted as part of the Night in Japan Home Sleep Monitoring Study (NinJaSleep Study) between November 2023 and March 2024 among 1,435 municipal employees in Koka City, Japan. Sleep debt was quantified using the Sleep Debt Index, calculated from self-report…
Psychological flexibility as a moderator of the association between premenstrual dysphoric disorder, depression, anxiety, positive parenting, and negative parenting
BACKGROUND: This study aimed to investigate whether psychological flexibility moderates the relationship between premenstrual dysphoric disorder (PMDD) symptoms and depression, anxiety, positive parenting, and negative parenting. METHODS: For this study, a sample of 1,538 menstruating mothers with children aged 0 to 3 years (227 with 0-year-olds, 428 with 1-year-olds, 409 with 2-year-olds, and 424 with 3-year-olds) was assessed utilizing the Prem…
Does digital cognitive behavioral therapy improve the insomnia and depression of workers to healthy levels? An open trial
BACKGROUND: Cognitive behavioral therapy for insomnia (CBT-I) has a high potential for improving insomnia and depressive symptoms; however, it is unclear whether the improvement of symptoms reaches the level of healthy people without these symptoms. We aimed to examine whether digital CBT-I can improve the insomnia and depression symptoms of workers to healthy levels. METHODS: The study included 752 workers who were divided into four groups by th…
Validity and reliability of the generalized pliance and tracking 2-way scale
This study developed and examined the validity and reliability of a scale that simultaneously measures generalized pliance and tracking with more focus on actions in daily situations. The so-called Generalized Pliance and Tracking 2-way Scale: GPT-2s comprises 16 items (8 items each for generalized pliance and tracking). In Study 1, an online survey was conducted among 1500 Japanese individuals (420 men, 1054 women, 26 others [mean age = 29.47 ye…
Development, reliability, and validity of the quality of life scale for insomnia
The QOL-I demonstrated good reliability and validity and is expected to be a valuable tool for clinically assessing the QOL of patients with insomnia
Assessing the Quick Inventory of Depressive Symptomatology Self-Report scores to predict continuous employment in mood disorder patients
The results emphasize the potential of the QIDS-SR as a prognostic instrument for predicting employment outcomes among individuals with depressive disorders. These findings further underscore the importance of managing depressive symptoms to mild or lower intensities to ensure ongoing employment
Treatment strategy for insomnia disorder
Expert consensus indicates that orexin receptor antagonists and sleep hygiene education are recommended as first-line treatments in most clinical situations to treat insomnia disorder
Sleep Debt Mediates the Relationship between Work-Related Social Factors, Presenteeism, and Well-Being in Japanese Workers
Sleep debt is associated with presenteeism and mental health; however, the association of sleep debt with presenteeism and well-being in the context of work-related social factors (commuting time, workdays, and working hours) has not been fully elucidated. This study aimed to examine whether work-related social factors are associated with presenteeism and well-being via sleep debt. The participant group comprised 872 full-time and 526 part-time w…
Psychometric Properties of the Japanese Version of the Parental Acceptance and Action Questionnaire in Parents with Infants and Toddlers
We aimed to examine the reliability and validity of the Parental Acceptance and Action Questionnaire-Japanese version (PAAQ-J). We considered a total of 2000 mothers with infants and toddlers aged 0-3 years and evaluated their scores on the PAAQ-J Acceptance and Action Questionnaire-II (AAQ-II) and Hospital Anxiety and Depression Scale (HADS). We conducted an exploratory factor analysis, creating a PAAQ-J with 12 items and three factors (α = 0.80…
Effects of Covid-19-Related Anxiety and Sleep Problems on Loneliness and Feelings of School Refusal in Adolescents
The findings of this study showed that sleep problems affected feelings of school refusal via both direct and indirect pathways through the exacerbation of loneliness. To prevent school refusal in adolescents, addressing the indirect pathway via loneliness could be effective in improving insomnia and sleep debt, while addressing the direct pathway could be effective in improving insomnia and chronotype
Prevalence and Factors Associated With the Risk of Delayed Sleep-Wake Phase Disorder in Japanese Youth
The risk of DSWPD seemed to be consistent with reports from Western countries, and individuals possibly affected by the disorder were thought to have deteriorated daytime functioning. In addition, lifestyle specific to youth, such as long-term LCD viewing at night and relatively loose social constraints, could be associated with the presence of DSWPD in this generation
How Does E-mail-Delivered Cognitive Behavioral Therapy Work for Young Adults (18–28 Years) with Insomnia? Mediators of Changes in Insomnia, Depression, Anxiety, and Stress
This study examined whether cognitive behavioral therapy (CBT) for insomnia (CBT-I) improved insomnia severity, by changing sleep-related mediating factors. It also examined whether an improvement in insomnia led to enhanced mental health. This study was a secondary analysis of a randomized controlled trial of e-mail-delivered CBT-I for young adults with insomnia. The participants were randomized to either CBT-I or self-monitoring. The mental hea…
Can an E-Mail-Delivered CBT for Insomnia Validated in the West Be Effective in the East? A Randomized Controlled Trial
This study examined the effects of an e-mail-delivered cognitive behavioral therapy for insomnia (CBT-I), validated in Western countries, on insomnia severity, anxiety, and depression in young adults with insomnia in Eastern countries, particularly Japan. This prospective parallel-group randomized clinical trial included college students with Insomnia Severity Index (ISI) scores of ten or higher. Participants were recruited via advertising on a u…
Large Questionnaire Survey on Sleep Duration and Insomnia Using the TV Hybridcast System by Japan Broadcasting Corporation (NHK)
Almost a quarter of the Japanese participants presented short sleep duration and insomnia. Furthermore, the Hybridcast system may be useful for performing large internet-based surveys, especially for elderly individuals
Sleep Debt and Social Jetlag Associated with Sleepiness, Mood, and Work Performance among Workers in Japan
Although sleep debt and social jetlag (SJL) influence daytime dysfunctions, the effects of both sleep debt and SJL on them have not been analyzed. The aim of this study was to examine the mutual relationship between sleep debt and SJL on daytime sleepiness, mood, and work performance. This study was a cross-sectional study on sleep health conducted on the Japanese general population. A total of 4505 general workers (30% female, aged 43.57 ± 11.63…
Evaluation of Severity Levels of the Athens Insomnia Scale Based on the Criterion of Insomnia Severity Index
The Athens Insomnia Scale (AIS) can be regarded as a highly useful instrument in both clinical and research settings, except for when assessing the severity level. This study aims to determine the severity criteria for AIS by using the Insomnia Severity Index (ISI). A total of 1666 government employees aged 20 years or older were evaluated using the AIS and ISI, the Patient Health Questionnaire for depressive symptoms, the Epworth Sleepiness Scal…
Preliminary Assessment of the Behavioral Activation Model in Japanese Undergraduate Students
Many studies have reported that behavioral activation is an effective intervention for depression. The behavioral activation model is based on several formulations. For example, depressive mood leads to avoidant behaviors, avoidance negatively affects social contacts, decreased socialization lessens opportunities for positive reinforcement, and a decrease in positive reinforcement results in more depressive mood. The purpose of this study was to …
A Japanese form of social anxiety (taijin kyofusho)
BACKGROUND: One specific type of social anxiety, occurring primarily in Japanese culture, is called taijin kyofusho. Taijin kyofusho is characterized by an intense fear that one's body parts or functions displease, embarrass or are offensive to others. AIM: The main aim of the present study was to compare the frequency and correlates of taijin kyofusho symptoms (TKS) in Japanese adolescents and their parents. METHOD: The sample included 351 adole…
Effects of Safety Behaviour On the Maintenance of Anxiety and Negative Belief Social Anxiety Disorder
Background: Safety behaviour plays an important role in the maintenance of social anxiety disorder (SAD). SAD patients engage in various safety behaviours in social situations in order to decrease the risk of negative evaluations from others. Aims: The present study examined the effect of safety behaviour on the maintenance of anxiety and negative belief in SAD by using Structural Equation Modelling (SEM). Methods: Participants were a healthy gro…
Sem obras proeminentes nesta página.
Effects of Safety Behaviour On the Maintenance of Anxiety and Negative Belief Social Anxiety Disorder
Background: Safety behaviour plays an important role in the maintenance of social anxiety disorder (SAD). SAD patients engage in various safety behaviours in social situations in order to decrease the risk of negative evaluations from others. Aims: The present study examined the effect of safety behaviour on the maintenance of anxiety and negative belief in SAD by using Structural Equation Modelling (SEM). Methods: Participants were a healthy gro…
A Japanese form of social anxiety (taijin kyofusho)
BACKGROUND: One specific type of social anxiety, occurring primarily in Japanese culture, is called taijin kyofusho. Taijin kyofusho is characterized by an intense fear that one's body parts or functions displease, embarrass or are offensive to others. AIM: The main aim of the present study was to compare the frequency and correlates of taijin kyofusho symptoms (TKS) in Japanese adolescents and their parents. METHOD: The sample included 351 adole…
Preliminary Assessment of the Behavioral Activation Model in Japanese Undergraduate Students
Many studies have reported that behavioral activation is an effective intervention for depression. The behavioral activation model is based on several formulations. For example, depressive mood leads to avoidant behaviors, avoidance negatively affects social contacts, decreased socialization lessens opportunities for positive reinforcement, and a decrease in positive reinforcement results in more depressive mood. The purpose of this study was to …
Evaluation of Severity Levels of the Athens Insomnia Scale Based on the Criterion of Insomnia Severity Index
The Athens Insomnia Scale (AIS) can be regarded as a highly useful instrument in both clinical and research settings, except for when assessing the severity level. This study aims to determine the severity criteria for AIS by using the Insomnia Severity Index (ISI). A total of 1666 government employees aged 20 years or older were evaluated using the AIS and ISI, the Patient Health Questionnaire for depressive symptoms, the Epworth Sleepiness Scal…
Can an E-Mail-Delivered CBT for Insomnia Validated in the West Be Effective in the East? A Randomized Controlled Trial
This study examined the effects of an e-mail-delivered cognitive behavioral therapy for insomnia (CBT-I), validated in Western countries, on insomnia severity, anxiety, and depression in young adults with insomnia in Eastern countries, particularly Japan. This prospective parallel-group randomized clinical trial included college students with Insomnia Severity Index (ISI) scores of ten or higher. Participants were recruited via advertising on a u…
Large Questionnaire Survey on Sleep Duration and Insomnia Using the TV Hybridcast System by Japan Broadcasting Corporation (NHK)
Almost a quarter of the Japanese participants presented short sleep duration and insomnia. Furthermore, the Hybridcast system may be useful for performing large internet-based surveys, especially for elderly individuals
Sleep Debt and Social Jetlag Associated with Sleepiness, Mood, and Work Performance among Workers in Japan
Although sleep debt and social jetlag (SJL) influence daytime dysfunctions, the effects of both sleep debt and SJL on them have not been analyzed. The aim of this study was to examine the mutual relationship between sleep debt and SJL on daytime sleepiness, mood, and work performance. This study was a cross-sectional study on sleep health conducted on the Japanese general population. A total of 4505 general workers (30% female, aged 43.57 ± 11.63…
Effects of Covid-19-Related Anxiety and Sleep Problems on Loneliness and Feelings of School Refusal in Adolescents
The findings of this study showed that sleep problems affected feelings of school refusal via both direct and indirect pathways through the exacerbation of loneliness. To prevent school refusal in adolescents, addressing the indirect pathway via loneliness could be effective in improving insomnia and sleep debt, while addressing the direct pathway could be effective in improving insomnia and chronotype
Prevalence and Factors Associated With the Risk of Delayed Sleep-Wake Phase Disorder in Japanese Youth
The risk of DSWPD seemed to be consistent with reports from Western countries, and individuals possibly affected by the disorder were thought to have deteriorated daytime functioning. In addition, lifestyle specific to youth, such as long-term LCD viewing at night and relatively loose social constraints, could be associated with the presence of DSWPD in this generation
How Does E-mail-Delivered Cognitive Behavioral Therapy Work for Young Adults (18–28 Years) with Insomnia? Mediators of Changes in Insomnia, Depression, Anxiety, and Stress
This study examined whether cognitive behavioral therapy (CBT) for insomnia (CBT-I) improved insomnia severity, by changing sleep-related mediating factors. It also examined whether an improvement in insomnia led to enhanced mental health. This study was a secondary analysis of a randomized controlled trial of e-mail-delivered CBT-I for young adults with insomnia. The participants were randomized to either CBT-I or self-monitoring. The mental hea…
Treatment strategy for insomnia disorder
Expert consensus indicates that orexin receptor antagonists and sleep hygiene education are recommended as first-line treatments in most clinical situations to treat insomnia disorder
Sleep Debt Mediates the Relationship between Work-Related Social Factors, Presenteeism, and Well-Being in Japanese Workers
Sleep debt is associated with presenteeism and mental health; however, the association of sleep debt with presenteeism and well-being in the context of work-related social factors (commuting time, workdays, and working hours) has not been fully elucidated. This study aimed to examine whether work-related social factors are associated with presenteeism and well-being via sleep debt. The participant group comprised 872 full-time and 526 part-time w…
Psychometric Properties of the Japanese Version of the Parental Acceptance and Action Questionnaire in Parents with Infants and Toddlers
We aimed to examine the reliability and validity of the Parental Acceptance and Action Questionnaire-Japanese version (PAAQ-J). We considered a total of 2000 mothers with infants and toddlers aged 0-3 years and evaluated their scores on the PAAQ-J Acceptance and Action Questionnaire-II (AAQ-II) and Hospital Anxiety and Depression Scale (HADS). We conducted an exploratory factor analysis, creating a PAAQ-J with 12 items and three factors (α = 0.80…
Assessing the Quick Inventory of Depressive Symptomatology Self-Report scores to predict continuous employment in mood disorder patients
The results emphasize the potential of the QIDS-SR as a prognostic instrument for predicting employment outcomes among individuals with depressive disorders. These findings further underscore the importance of managing depressive symptoms to mild or lower intensities to ensure ongoing employment
Psychological flexibility as a moderator of the association between premenstrual dysphoric disorder, depression, anxiety, positive parenting, and negative parenting
BACKGROUND: This study aimed to investigate whether psychological flexibility moderates the relationship between premenstrual dysphoric disorder (PMDD) symptoms and depression, anxiety, positive parenting, and negative parenting. METHODS: For this study, a sample of 1,538 menstruating mothers with children aged 0 to 3 years (227 with 0-year-olds, 428 with 1-year-olds, 409 with 2-year-olds, and 424 with 3-year-olds) was assessed utilizing the Prem…
Does digital cognitive behavioral therapy improve the insomnia and depression of workers to healthy levels? An open trial
BACKGROUND: Cognitive behavioral therapy for insomnia (CBT-I) has a high potential for improving insomnia and depressive symptoms; however, it is unclear whether the improvement of symptoms reaches the level of healthy people without these symptoms. We aimed to examine whether digital CBT-I can improve the insomnia and depression symptoms of workers to healthy levels. METHODS: The study included 752 workers who were divided into four groups by th…
Validity and reliability of the generalized pliance and tracking 2-way scale
This study developed and examined the validity and reliability of a scale that simultaneously measures generalized pliance and tracking with more focus on actions in daily situations. The so-called Generalized Pliance and Tracking 2-way Scale: GPT-2s comprises 16 items (8 items each for generalized pliance and tracking). In Study 1, an online survey was conducted among 1500 Japanese individuals (420 men, 1054 women, 26 others [mean age = 29.47 ye…
Development, reliability, and validity of the quality of life scale for insomnia
The QOL-I demonstrated good reliability and validity and is expected to be a valuable tool for clinically assessing the QOL of patients with insomnia
Sleep debt and depressive symptoms among workers
Introduction This study examined whether fatigue mediates the association between sleep debt and depressive symptoms among municipal employees in Japan. Methods This cross-sectional study was conducted as part of the Night in Japan Home Sleep Monitoring Study (NinJaSleep Study) between November 2023 and March 2024 among 1,435 municipal employees in Koka City, Japan. Sleep debt was quantified using the Sleep Debt Index, calculated from self-report…
Psychiatry (17 obras) · Psychology (16 obras) · Clinical Psychology (12 obras) · Medicine (12 obras) · Sleep and related disorders (11 obras) · Insomnia (9 obras) · Anxiety (8 obras) · Clinical Psychology (8 obras) · Sleep and Wakefulness Research (6 obras) · Youth Substance Use and School Attendance (6 obras)