Sleep Duration among Children 8 Months after the 2011 Japan Earthquake and Tsunami

Usami, Masahide; Iwadare, Yoshitaka; Kodaira, Masaki; Watanabe, Kyota; Aoki, Momoko; Katsumi, Chiaki; Matsuda, Kumi; Makino, Kazunori; Iijima, Sonoko; Harada, Mikihiko; Tanaka, Hiromi; Sasaki, Yoko; Tanaka, Tetsuya; Ushijima, Hirokage; Sakamoto, Kazuhiko

doi:10.1371/journal.pone.0065398

Cited by 31 publications

(30 citation statements)

References 17 publications

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“…Our results are in line with prior research, which although limited, has found that children and adolescents exposed to disasters commonly have persistent sleep disturbances post-event, both when children and parents report symptomology (Brown, Mellman, Alfano, & Weems, 2011; Dirkzwager, Kerssens, & Yzermans, 2006; Geng, Fan, Mo, Simandl, & Liu, 2013; Usami et al, 2013). To the best of our knowledge, this is the first prospective study assessing sleep disturbances among children following natural disasters.…”

Section: Discussionsupporting

confidence: 92%

“…Previous findings have indicated an association between PTSD and other psychological symptoms such as anxiety and depression (Fan et al, 2011; Goenjian et al, 2011; Lai et al, 2015, 2013), higher risks of behavioural problems, substance abuse and sleep disturbance (Pfefferbaum et al, 2015; Usami et al, 2013). This further highlights the importance of studying more diverse symptoms, particularly psychosomatic symptoms.…”

Section: Discussionmentioning

confidence: 96%

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Long-term health of children following the Eyjafjallajökull volcanic eruption: a prospective cohort study

Hlodversdóttir

Thorsteinsdottir

Þórðardóttir

et al. 2018

European Journal of Psychotraumatology

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Background: More than 500 million people worldwide live within exposure range of an active volcano and children are a vulnerable subgroup of such exposed populations. However, studies on the effects of volcanic eruptions on children’s health beyond the first year are sparse. Objective: To examine the effect of the 2010 Eyjafjallajökull eruption on physical and mental health symptoms among exposed children in 2010 and 2013 and to identify potential predictive factors for symptoms. Method: In a population-based prospective cohort study, data was collected on the adult population (N = 1615) exposed to the 2010 Eyjafjallajökull eruption and a non-exposed group (N = 697). The exposed group was further divided according to exposure level. All participants answered questionnaires assessing their children´s and their own perceived health status in 2010 and 2013. Results: In 2010, exposed children were more likely than non-exposed children to experience respiratory symptoms (medium exposed OR 1.47; 95% CI 1.07–2.03; high exposed OR 1.52; 95% CI 1.03–2.24) and anxiety/worries (medium exposed OR 2.39; 95% CI 1.67–3.45; high exposed OR 2.77; 95% CI 1.81–4.27). Both genders had an increased risk of symptoms of anxiety/worries but only exposed boys were at increased risk of experiencing headaches and sleep disturbances compared to non-exposed boys. Within the exposed group, children whose homes were damaged were at increased risk of experiencing anxiety/worries (OR 1.62; 95% CI 1.13–2.32) and depressed mood (OR 1.55; 95% CI 1.07–2.24) than children whose homes were not damaged. Among exposed children, no significant decrease of symptoms was detected between 2010 and 2013. Conclusions: Adverse physical and mental health problems experienced by the children exposed to the eruption seem to persist for up to a three-year period post-disaster. These results underline the importance of appropriate follow-up for children after a natural disaster.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 96%

Long-term health of children following the Eyjafjallajökull volcanic eruption: a prospective cohort study

Hlodversdóttir

Thorsteinsdottir

Þórðardóttir

et al. 2018

European Journal of Psychotraumatology

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“…We have conducted a large‐scale screening for symptoms of psychiatric illness using the PTSSC‐15. We now demonstrate that, in addition to signs of post‐traumatic stress, these children exhibit sleep disturbances that may exacerbate pre‐existing symptoms or trigger delayed depression, anxiety, and PTSD.…”

Section: Discussionmentioning

confidence: 77%

“…In addition to PTSD, the risks of depression and anxiety disorders also increase after a disaster . We previously reported the results of an investigation on traumatic symptoms in children conducted approximately 8 months after the 2011 earthquake and tsunami . However, the self‐completion questionnaire used, the Post Traumatic Stress Symptoms for Children‐15 items (PTSSC‐15), contains only one item on sleep disruption.…”

Section: Introductionmentioning

confidence: 99%

Changes in traumatic symptoms and sleep habits among junior high school students after the Great East Japan Earthquake and Tsunami

Iwadare

Usami

Ushijima

et al. 2014

Sleep and Biological Rhythms

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Changes in sleep patterns among children following traumatic experiences may be indicative of post‐traumatic psychiatric disorders and contribute to disease persistence. We evaluated long‐term changes in the sleep habits of 1919 junior high school students who experienced the 2011 Japan earthquake and tsunami, and examined the associations among sleep patterns, trauma symptoms, and specific traumatic events. The Post‐Traumatic Stress Symptoms for Children‐15 items self‐completion questionnaire was distributed to the children, and a questionnaire regarding three specific traumatic events (home damage, bereavement, and evacuation) was distributed to their teachers. Compared to the same survey conducted 8 months after the disaster, a 20‐month post‐disaster survey revealed significantly shorter mean sleep duration and a delay in sleep phase (P < 0.0001). On the 20‐month survey, weekday sleep duration was shorter and sleep–wake pattern delayed in children who had experienced home damage compared to children with no such experience (P < 0.01). Children who had experienced bereavement also reported a shorter mean sleep duration on the 20‐month survey compared to children reporting no bereavement experience (P < 0.05). Differences in sleep duration between weekdays and holidays at 20 months post‐disaster suggested a sleep debt due to sleep disruption. There were no significant differences in Post‐Traumatic Stress Symptoms for Children‐15 items total scores between groups defined by the type of traumatic experience. Traumatic events (home damage, bereavement) associated with the 2011 Japan earthquake and tsunami have caused long‐term sleep disruption in children from this region.

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“…The long-range electrostatic forces were evaluated using the classical particle mesh Ewald (PME) method [56] while chemical bonds between hydrogen and heavy atoms were constrained to their equilibrium value. To describe the interactions, the Charmm36 [57,58] force field was used.…”

Section: Computational Method: Preparation Of Models For Minimizationmentioning

confidence: 99%

Carbon nanotube – Protamine hybrid: Evaluation of DNA cell penetration

Caoduro

Kacem

Boukari

et al. 2016

Carbon

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Sleep Duration among Children 8 Months after the 2011 Japan Earthquake and Tsunami

Cited by 31 publications

References 17 publications

Long-term health of children following the Eyjafjallajökull volcanic eruption: a prospective cohort study

Long-term health of children following the Eyjafjallajökull volcanic eruption: a prospective cohort study

Changes in traumatic symptoms and sleep habits among junior high school students after the Great East Japan Earthquake and Tsunami

Carbon nanotube – Protamine hybrid: Evaluation of DNA cell penetration

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