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https://www.readbyqxmd.com/read/29913073/chronotype-and-environmental-light-exposure-in-a-student-population
#1
Kate Porcheret, Lucien Wald, Lin Fritschi, Menno Gerkema, Marijke Gordijn, Martha Merrrow, Shantha M W Rajaratnam, Daniel Rock, Tracey L Sletten, Guy Warman, Katharina Wulff, Till Roenneberg, Russell G Foster
In humans and most other species, changes in the intensity and duration of light provide a critical set of signals for the synchronisation of the circadian system to the astronomical day. The timing of activity within the 24 h day defines an individual's chronotype, i.e. morning, intermediate or evening type. The aim of this study was to investigate the associations between environmental light exposure, due to geographical location, on the chronotype of university students. Over 6 000 university students from cities in the Northern Hemisphere (Oxford, Munich and Groningen) and Southern Hemisphere (Perth, Melbourne and Auckland) completed the Munich ChronoType Questionnaire...
June 18, 2018: Chronobiology International
https://www.readbyqxmd.com/read/29873737/excessive-daytime-sleepiness-objective-napping-and-11-year-risk-of-parkinson-s-disease-in-older-men
#2
Yue Leng, Samuel M Goldman, Peggy M Cawthon, Katie L Stone, Sonia Ancoli-Israel, Kristine Yaffe
Background: It is unknown whether subjective daytime sleepiness or objective napping could precede the risk of Parkinson's disease (PD) in the long term. Methods: We studied 2920 men (mean age 76 years) without a history of PD and followed them for 11 years. Excessive daytime sleepiness (EDS) was defined as having an Epworth Sleepiness Scale score >10. Objective naps were defined as ≥5 consecutive minutes of inactivity as measured by actigraphy, and napping duration was the accumulated time of naps outside the main sleep period...
June 4, 2018: International Journal of Epidemiology
https://www.readbyqxmd.com/read/29873546/convergent-and-construct-validity-and-test-retest-reliability-of-the-caen-chronotype-questionnaire-in-six-languages
#3
Sylvain Laborde, Fabrice Dosseville, Asma Aloui, Helmi Ben Saad, Maurizio Bertollo, Laura Bortoli, Barbara Braun, Karim Chamari, Hamdi Chtourou, Yvonne De Kort, Abdulaziz Farooq, Marijke Cm Gordijn, Pablo Greco, Félix Guillén, Monoem Haddad, Thomas Hosang, Karim Khalladi, Romain Lericollais, Mariana Lopes, Claudio Robazza, Karin Smolders, Alexander Wurm, Mark S Allen
Chronotype questionnaires provide a simple and time-effective approach to assessing individual differences in circadian variations. Chronotype questionnaires traditionally focused on one dimension of chronotype, namely its orientation along a continuum of morningness and eveningness. The Caen Chronotype Questionnaire (CCQ) was developed to assess an additional dimension of chronotype that captures the extent to which individual functioning varies during the day (amplitude). The aim of this study was to provide a multilanguage validation of the CCQ in six world regions (Arabic, Dutch, German, Italian, Portuguese and Spanish)...
June 6, 2018: Chronobiology International
https://www.readbyqxmd.com/read/29862086/association-between-the-munich-chronotype-questionnaire-and-wrist-actigraphy
#4
Jose Arturo Santisteban, Thomas G Brown, Reut Gruber
Chronotype refers to individuals' preferences for timing of sleep and wakefulness. It can be quantified by measuring the midpoint time between the start and end of sleep during free days. Measuring chronotype is helpful to diagnose circadian rhythm sleep-wake disorders. The Munich Chronotype Questionnaire (MCTQ) is a self-reported measure of chronotype that calculates the midpoint of sleep on free days based on self-reported bed and wake times. Self-reports of sleep are prone to bias. The objective was to examine the agreement between the MCTQ-derived midpoint and an objective measure obtained using wrist actigraphy...
2018: Sleep Disorders
https://www.readbyqxmd.com/read/29860110/prospective-study-of-chronotype-and-incident-depression-among-middle-and-older-aged-women-in-the-nurses-health-study-ii
#5
Céline Vetter, Shun-Chiao Chang, Elizabeth E Devore, Florian Rohrer, Olivia I Okereke, Eva S Schernhammer
BACKGROUND: Prior cross-sectional studies have suggested that being a late chronotype is associated with depression and depressive symptoms, but prospective data are lacking. METHODS: We examined the association between chronotype and incident depression (defined as self-reported physician/clinician-diagnosed depression or antidepressant medication use) in 32,470 female participants of the Nurses' Health Study II cohort who self-reported their chronotype (early, intermediate or late) and were free of depression at baseline in 2009 (average age: 55 yrs)...
May 25, 2018: Journal of Psychiatric Research
https://www.readbyqxmd.com/read/29851518/anxiety-symptomatology-sex-and-chronotype-the-mediational-effect-of-diurnal-sleepiness
#6
Angela J Pereira-Morales, Ana Adan, Ivana L Bussi, Andrés Camargo
Diurnal subjective sleepiness has been associated with a large number of negative outcomes, such as increased risk of accidents and development of mental disorders as depression and anxiety. However, the role of the diurnal subjective sleepiness as a mediator is poorly understood. The goal of the present study was to examine the role of diurnal subjective sleepiness as a mediator of the relationship between sex, chronotype and anxiety symptoms in healthy young adults. Four-hundred and sixty-seven healthy young adults (64...
May 31, 2018: Chronobiology International
https://www.readbyqxmd.com/read/29778920/eveningness-chronotype-insomnia-symptoms-and-emotional-and-behavioural-problems-in-adolescents
#7
Shirley Xin Li, Ngan Yin Chan, Mandy Wai Man Yu, Siu Ping Lam, Jihui Zhang, Joey Wing Yan Chan, Albert Martin Li, Yun Kwok Wing
OBJECTIVE: Eveningness tendency and insomnia are common in adolescents, but whether they have an independent or synergistic effect on the risk of psychopathology have remained undefined. The present study aimed to examine eveningness chronotype and insomnia symptoms in relation to mental health and emotional and behavioural problems in a community-based adolescent population. METHODS: A total of 4948 adolescents (weighted mean age: 14.5 ± 1.8 years, weighted percentage of females: 48...
April 17, 2018: Sleep Medicine
https://www.readbyqxmd.com/read/29764217/chronotype-and-depressive-symptoms-in-students-an-investigation-of-possible-mechanisms
#8
Julia F Van den Berg, Liia Kivelä, Niki Antypa
Individuals with an evening chronotype are at increased risk of experiencing emotional problems, including depressive symptoms. However, the mechanisms underlying these associations remain unclear. The present study aimed to determine whether poor sleep quality, substance use and cognitive emotion regulation difficulties - which have been implicated in the etiology of depression - mediate the relationship between chronotype and depressive symptoms in a student sample, which was assessed cross-sectionally and after 1 year...
May 15, 2018: Chronobiology International
https://www.readbyqxmd.com/read/29737879/associations-between-chronotype-sleep-disturbances-and-seasonality-with-fatigue-and-inflammatory-bowel-disease-symptoms
#9
Adrian A Chrobak, Jarosław Nowakowski, Małgorzata Zwolińska-Wcisło, Dorota Cibor, Magdalena Przybylska-Feluś, Katarzyna Ochyra, Monika Rzeźnik, Alicja Dudek, Aleksandra Arciszewska, Marcin Siwek, Dominika Dudek
Growing number of studies suggests link between circadian rhythms and inflammatory bowel diseases (IBD) manifestation. We hypothesize that: 1) IBD are associated with increased eveningness and sleep disturbances; 2) eveningness and sleep disturbances are related to more severe IBD symptoms. In total, 129 participants were enrolled to this study, divided into three groups: 34 Crohn's disease (CD) patients, 38 ulcerative colitis (UC) patients and 57 healthy controls (HC) group. They all fulfilled a questionnaire, consisting of the Composite Scale of Morningness (CSM), Seasonal Pattern Assessment Questionnaire (SPAQ), Pittsburgh Sleep Quality Index, Inflammatory Bowel Disease Questionnaire (IBDQ) and Multidimensional Fatigue Inventory (MFI)...
May 8, 2018: Chronobiology International
https://www.readbyqxmd.com/read/29702432/altered-resting-state-connectivity-within-default-mode-network-associated-with-late-chronotype
#10
Charlotte Mary Horne, Ray Norbury
Current evidence suggests late chronotype individuals have an increased risk of developing depression. However, the underlying neural mechanisms of this association are not fully understood. Forty-six healthy, right-handed individuals free of current or previous diagnosis of depression, family history of depression or sleep disorder underwent resting-state functional Magnetic Resonance Imaging (rsFMRI). Using an Independent Component Analysis (ICA) approach, the Default Mode Network (DMN) was identified based on a well validated template...
July 2018: Journal of Psychiatric Research
https://www.readbyqxmd.com/read/29642757/associations-between-chronotype-morbidity-and-mortality-in-the-uk-biobank-cohort
#11
Kristen L Knutson, Malcolm von Schantz
Later chronotype (i.e. evening preference) and later timing of sleep have been associated with greater morbidity, including higher rates of metabolic dysfunction and cardiovascular disease (CVD). However, no one has examined whether chronotype is associated with mortality risk to date. Our objective was to test the hypothesis that being an evening type is associated with increased mortality in a large cohort study, the UK Biobank. Our analysis included 433 268 adults aged 38-73 at the time of enrolment and an average 6...
April 11, 2018: Chronobiology International
https://www.readbyqxmd.com/read/29624593/work-routines-moderate-the-association-between-eveningness-and-poor-psychological-well-being
#12
Felipe Gutiérrez Carvalho, Camila Morelatto de Souza, Maria Paz Loayza Hidalgo
Well-being is a useful screening method for the detection of mood disorders. Evidence associating psychological well-being with sleep-wake patterns exists, as well as associations with sleep-wake patterns, work-related parameters, and perceived self-efficacy. Despite the growing research regarding the relationship between these factors and mental health, there are few studies that analyze them together. OBJECTIVE: To investigate if the association between sleep-wake patterns and psychological well-being is mediated or moderated by perceived self-efficacy, work flexibility and work routines...
2018: PloS One
https://www.readbyqxmd.com/read/29609867/circadian-health-differs-between-boys-and-girls-as-assessed-by-non-invasive-tools-in-school-aged-children
#13
Gloria Maria Barraco, Nuria Martínez-Lozano, Claudia Vales-Villamarín, María Del Carmen Blaya, Rafael Rios, Juan Antonio Madrid, Paul Fardy, Marta Garaulet
BACKGROUND & AIMS: Assessment of circadian health is confined to adults. However, understanding circadian status of school-aged children is necessary due to its health implications. The aim was to develop 1) a protocol to assess circadian function in school-aged children by combining the best non-invasive tools previously validated in adults; 2) a score to capture circadian function in children including food timing. This protocol will allow to explore gender differences and to compare the circadian function of school-aged children with adults from the same Mediterranean area...
March 21, 2018: Clinical Nutrition: Official Journal of the European Society of Parenteral and Enteral Nutrition
https://www.readbyqxmd.com/read/29551440/racing-the-clock-the-role-of-circadian-rhythmicity-in-addiction-across-the-lifespan
#14
REVIEW
Danielle Gulick, Joshua J Gamsby
Although potent effects of psychoactive drugs on circadian rhythms were first described over 30 years ago, research into the reciprocal relationship between the reward system and the circadian system - and the impact of this relationship on addiction - has only become a focus in the last decade. Nonetheless, great progress has been made in that short time toward understanding how drugs of abuse impact the molecular and physiological circadian clocks, as well as how disruption of normal circadian rhythm biology may contribute to addiction and ameliorate the efficacy of treatments for addiction...
March 15, 2018: Pharmacology & Therapeutics
https://www.readbyqxmd.com/read/29530363/comprehensive-assessment-of-the-impact-of-life-habits-on-sleep-disturbance-chronotype-and-daytime-sleepiness-among-high-school-students
#15
Akiyoshi Shimura, Sakai Hideo, Yoshikazu Takaesu, Ryota Nomura, Yoko Komada, Takeshi Inoue
OBJECTIVE: Sleep affects adolescents in various ways. However, the effects of multiple factors on sleep hygiene remain unclear. A comprehensive assessment of the effects of life habits on sleep in high-school students was conducted. METHODS: A cross-sectional survey of 344 high school students (age range 15-17; 171 boys, 173 girls) in Tokyo, Japan was conducted in 2015. Complete responses were provided by 294 students. Demographic variables, Pittsburgh Sleep Quality Index (PSQI), diurnal type scale, Pediatric Daytime Sleepiness Scale (PDSS), and life habits such as dinnertime, viewing electronic displays, caffeine intake, sunlight in the morning, and the brightness of the room in the night were asked...
April 2018: Sleep Medicine
https://www.readbyqxmd.com/read/29498667/long-term-melatonin-therapy-for-adolescents-and-young-adults-with-chronic-sleep-onset-insomnia-and-late-melatonin-onset-evaluation-of-sleep-quality-chronotype-and-lifestyle-factors-compared-to-age-related-randomly-selected-population-cohorts
#16
Tom C Zwart, Marcel G Smits, Toine C G Egberts, Carin M A Rademaker, Ingeborg M van Geijlswijk
The extent of continuance of melatonin therapy initiated in pre-pubertal children with chronic sleep onset insomnia (CSOI) was investigated in young adult life. Sleep timing, sleep quality, adverse events, reasons for cessation of therapy, and patient characteristics with regard to therapy regimen, chronotype and lifestyle factors possibly influencing sleeping behavior were assessed. With an online survey using questionnaires (Pittsburgh Sleep Quality Index, Insomnia Severity Index, Morningness-Eveningness Questionnaire, and Munich Chronotype Questionnaire), outcomes were measured and compared with age-related controls...
March 2, 2018: Healthcare (Basel, Switzerland)
https://www.readbyqxmd.com/read/29482662/bright-light-therapy-versus-physical-exercise-to-prevent-co-morbid-depression-and-obesity-in-adolescents-and-young-adults-with-attention-deficit-hyperactivity-disorder-study-protocol-for-a-randomized-controlled-trial
#17
Jutta S Mayer, Katharina Hees, Juliane Medda, Oliver Grimm, Philip Asherson, Mariano Bellina, Michael Colla, Pol Ibáñez, Elena Koch, Antonio Martinez-Nicolas, Adrià Muntaner-Mas, Anna Rommel, Nanda Rommelse, Saskia de Ruiter, Ulrich W Ebner-Priemer, Meinhard Kieser, Francisco B Ortega, Johannes Thome, Jan K Buitelaar, Jonna Kuntsi, J Antoni Ramos-Quiroga, Andreas Reif, Christine M Freitag
BACKGROUND: The risk for major depression and obesity is increased in adolescents and adults with attention-deficit / hyperactivity disorder (ADHD) and adolescent ADHD predicts adult depression and obesity. Non-pharmacological interventions to treat and prevent these co-morbidities are urgently needed. Bright light therapy (BLT) improves day-night rhythm and is an emerging therapy for major depression. Exercise intervention (EI) reduces obesity and improves depressive symptoms. To date, no randomized controlled trial (RCT) has been performed to establish feasibility and efficacy of these interventions targeting the prevention of co-morbid depression and obesity in ADHD...
February 26, 2018: Trials
https://www.readbyqxmd.com/read/29479768/evening-use-of-caffeine-moderates-the-relationship-between-caffeine-consumption-and-subjective-sleep-quality-in-students
#18
Mirjam L Kerpershoek, Niki Antypa, Julia F Van den Berg
Caffeine is often used to reduce sleepiness; however, research suggests that it can also cause poor sleep quality. The timing of caffeine use, amongst other factors, is likely to be important for the effects it has on sleep quality. In addition, individual differences exist in the effect of caffeine on sleep quality. This cross-sectional study investigated the influence of the timing of caffeine consumption on and a possible moderating role of chronotype in the relationship between caffeine consumption and sleep quality in 880 students (74...
February 25, 2018: Journal of Sleep Research
https://www.readbyqxmd.com/read/29413871/time-drawings-spatial-representation-of-temporal-concepts
#19
María Juliana Leone, Alejo Salles, Alejandro Pulver, Diego Andrés Golombek, Mariano Sigman
Time representation is a fundamental property of human cognition. Ample evidence shows that time (and numbers) are represented in space. However, how the conceptual mapping varies across individuals, scales, and temporal structures remains largely unknown. To investigate this issue, we conducted a large online study consisting in five experiments that addressed different time scales and topology: Zones of time, Seasons, Days of the week, Parts of the day and Timeline. Participants were asked to map different kinds of time events to a location in space and to determine their size and color...
March 2018: Consciousness and Cognition
https://www.readbyqxmd.com/read/29408158/course-risk-factors-and-mental-health-outcomes-of-excessive-daytime-sleepiness-in-rural-chinese-adolescents-a-one-year-prospective-study
#20
Chunliu Luo, Jihui Zhang, Weijun Chen, Wanxian Lu, Jiyang Pan
BACKGROUND: This study aimed to examine the one-year incidence and persistence of excessive daytime sleepiness (EDS) in rural Chinese adolescents and their risk factors. In addition, we also aimed to explore the potential bidirectional associations of EDS with anxiety symptoms and depressive symptoms. METHODS: A total of 3736 adolescents from 5 high schools from rural area in the south China were eligible for follow-up. Among them, 2787 responded to follow-up after one year...
April 15, 2018: Journal of Affective Disorders
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