The Relationship between a Night Usage of Mobile Phone and Sleep Habit and the Circadian Typology of Japanese Students Aged 18 - 30 yrs

Kawada, Takahiro; Kataoka, Tetsuro; Tsuji, Fujiko; Nakade, Miyo; Krejčí, Milada; Noji, Teruki; Takeuchi, Hitomi; Harada, Tetsuo

doi:10.4236/psych.2017.86058

Cited by 10 publications

(5 citation statements)

References 38 publications

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“…For example, 98% of the students attending junior high school affiliated to Faculty of Education, Kochi University has their own smart-phone in 2016 (Tsunomori, Harada et al, unpublished). Kawada et al (2017) reported that university students who put their own smart-phones in their beds during night sleep were significantly much more evening-typed than those who put it far from their beds. Also in junior high school students, the shifting to more evening-typed life is very dangerous for them to grow in the adolescent days from physical (disturbed menstrual cycles for females adolescents: Takeuchi et al, 2005) and mental view points (higher frequency to be anger, irritated, out-of control of emotion and depressed: Harada et al, 2012).…”

Section: Discussionmentioning

confidence: 99%

Intervention Class Study to Promote a Morning-Typed Life for Japanese Junior High School Students Using a Picture Leaflet as a Teaching Subject

Kawamata¹,

Kawasumi²,

Kawada³

et al. 2017

IJPS

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An intervention study was performed as a class (50 min for 136 junior high school students aged 13-14 years old) using a picture leaflet for junior high school students. The leaflet shows a detailed model day for "morning-typed student" versus "evening-typed one" based on several scientific evidences so far. An integrated questionnaire was administrated just before the intervention class and also one month after the class and the effects of class was evaluated. The questionnaire included the Diurnal Type Scale (DTS) which Torsvall and Ǻkerstedt (1980) constructed, and questions on sleep habits, mental health and breakfast contents. Among the students who occupied 75% as the morning-and medium typed populations before the intervention, students who increased the number of dishes at breakfast after the intervention class did not significantly shift their DTS scores (p=0.200), while students who did not change the number shifted their DTS scores to more evening-typed (p=0.012). Among ones who occupied 25% as evening-typed, students who increased the number of dishes significantly shifted their DTS to morning-typed (p=0.026), while ones who did not change the number did not change their DTS (p=0.893). In the whole, although the students experienced the intervention class, there were no significant effects to shift their diurnal rhythm into morning-typed direction, because the month after the intervention is the winter holidays (December-January). The intervention study may be effective for students to prevent the shift of their diurnal rhythm into "evening-typed", even though the teacher of the intervention class has no previous knowledge on sleep sciences at all and study the leaflet for only 2 or 3 hours just before the class.

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Section: Discussionmentioning

confidence: 99%

Intervention Class Study to Promote a Morning-Typed Life for Japanese Junior High School Students Using a Picture Leaflet as a Teaching Subject

Kawamata¹,

Kawasumi²,

Kawada³

et al. 2017

IJPS

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“…Bedtime smartphone use has been known to worsen sleep quality and consequent daytime function in adults, and was associated with depressed mood in adolescents (6, 7). Overuse of smartphones in bed was proven to be associated with poor sleep quality, mental health, and delayed chronotype in Japanese college students (8). There underlie several mechanisms for this phenomenon; firstly, the screen light emitted from smartphones significantly suppresses the secretion of melatonin, and consequently disrupts sleep (9).…”

Section: Introductionmentioning

confidence: 99%

Prolonged Bedtime Smartphone Use is Associated With Altered Resting-State Functional Connectivity of the Insula in Adult Smartphone Users

et al. 2019

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Prolonged bedtime smartphone use is often associated with poor sleep quality and daytime dysfunction. In addition, the unstructured nature of smartphones may lead to excessive and uncontrolled use, which can be a cardinal feature of problematic smartphone use. This study was designed to investigate functional connectivity of insula, which is implicated in salience processing, interoceptive processing, and cognitive control, in association with prolonged bedtime smartphone use. We examined resting-state functional connectivity (rsFC) of insula in 90 adults who used smartphones by functional magnetic resonance imaging (fMRI). Smartphone time in bed was measured by self-report. Prolonged bedtime smartphone use was associated with higher smartphone addiction proneness scale (SAPS) scores, but not with sleep quality. The strength of the rsFC between the left insula and right putamen, and between the right insula and left superior frontal, middle temporal, fusiform, inferior orbitofrontal gyrus and right superior temporal gyrus was positively correlated with smartphone time in bed. The findings imply that prolonged bedtime smartphone use can be an important behavioral measure of problematic smartphone use and altered insula-centered functional connectivity may be associated with it.

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“…The so-called 24-hour society, which is currently in progress in Japan, seems to change environmental conditions surrounding the children. For example, mobile phones are used by more than 90% in 2000 and more than 98% in 2017 of university students, and more than 30% in 2000 and 95% in 2017 of junior high school students living in the urban area of Kochi city (33°N) had their own mobile phone (currently, most ones have smart phones) [4,5]. Students can communicate with their colleagues even in the middle of the night with mobile phones.…”

Section: Introductionmentioning

confidence: 99%

“…Students can communicate with their colleagues even in the middle of the night with mobile phones. Frequent or long-time (more than 30 min) usage of the mobile phone makes university and junior high school students more evening-typed [4,5]. At least for Japanese students in junior and senior high schools and universities, convenience stores have critical items for usual life, and these provide many kinds of foods and other goods for usual life.…”

Section: Introductionmentioning

confidence: 99%

“…How do cow's milk proteins promote human health? Eight ways to promote human health were demonstrated by Nongonierma and FitzGerald [44]: (1) improving satiety and weight management, (2) reducing risk of heart disease, (3) having an antimicrobial role, (4) having anti-inflammatory effects, (5) showing anticancer effects, (6) exerting antioxidant effects, (7) affecting insulin secretion and serum glucose regulation, and (8) an action upon muscle protein synthesis.…”

Section: Introductionmentioning

confidence: 99%

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Salivary Melatonin at Night: Responding to the Night Lighting and Cow’s Milk Consumption at Breakfast in Japanese Junior High and University Students

Takeuchi¹,

Harada²

2018

Melatonin - Molecular Biology, Clinical and Pharmaceutical Approaches

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(1) In junior high school students aged 14-15 years old, the salivary melatonin level increased rapidly from 3.00 pg/ml at 21:45 to 9.18 pg/ml at 23:40 under orange light from light bulb, whereas it remained at less than 1.3 pg/ml under white light from fluorescent lamp. (2) In 3 weeks of intervention on university athlete students, the salivary melatonin concentration at 23:00 of G3 (protein-rich breakfast and following sunlight exposure and orange light from the light bulb at night) after intervention was significantly higher than that of G1 (protein-poor breakfast and not following exposure to sunlight and white light from the fluorescent lamp at night) and G2 (protein-rich breakfast and following exposure to sunlight and white lights from the fluorescent lamp at night). (3) This study evaluates the effects of cow's milk intake (Group 1: G1) for 20 days at breakfast on saliva melatonin concentration at 22:00 and 23:00 on 0, 10, and 21 days of the intervention period in Japanese university male athletes attending a university soccer club. In the intervention group (G1), salivary melatonin concentration increased at 22:00 in comparison with that before intervention, but there was no significant change in the control group (Group 2: G2). On the other hand, there were no significant differences in the melatonin at 23:00 between the both groups just after 21 days of intervention. Intake of cow's milk at breakfast might make the circadian phase in advance in the soccer athletes.

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The Relationship between a Night Usage of Mobile Phone and Sleep Habit and the Circadian Typology of Japanese Students Aged 18 - 30 yrs

Abstract: This study tries to investigate the current relationship between the habit to use mobile phone and the diurnal type scale and sleep habit in Japanese students.

Cited by 10 publications

References 38 publications

Intervention Class Study to Promote a Morning-Typed Life for Japanese Junior High School Students Using a Picture Leaflet as a Teaching Subject

Intervention Class Study to Promote a Morning-Typed Life for Japanese Junior High School Students Using a Picture Leaflet as a Teaching Subject

Prolonged Bedtime Smartphone Use is Associated With Altered Resting-State Functional Connectivity of the Insula in Adult Smartphone Users

Salivary Melatonin at Night: Responding to the Night Lighting and Cow’s Milk Consumption at Breakfast in Japanese Junior High and University Students

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