keyword
MENU ▼
Read by QxMD icon Read
search

Chronotype

keyword
https://www.readbyqxmd.com/read/28537801/association-of-chronotype-and-social-jetlag-with-human-non-verbal-intelligence
#1
A S Panev, T A Tserne, A S Polugrudov, L A Bakutova, N B Petrova, O V Tatarinova, O N Kolosova, M F Borisenkov
The aim of this study was to evaluate the effects of chronotype and social jetlag (SJL) on intelligence. Subjects were aged 14-25 years (n = 1008). A significant effect of intelligence on academic performance, as measured by the Raven's Standard Progressive Matrices test, was found (F2,917 = 11.75, P < 0.0001, η(2) = 0.03). When SJL was less than 2 hours, the intelligence of people with late chronotype was found to be higher than that of subjects with early and intermediate chronotypes (F2,305 = 3.12, P < 0...
May 24, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28525634/association-between-weekend-catch-up-sleep-and-lower-body-mass-population-based-study-weekend-catch-up-sleep-and-body-mass-index
#2
Hee-Jin Im, Shin-Hye Baek, Min Kyung Chu, Kwang Ik Yang, Won-Joo Kim, Seong-Ho Park, Robert J Thomas, Chang-Ho Yun
Study Objectives: To determine if weekend catch-up sleep (CUS) impacts body mass index (BMI) in the general population. Methods: A stratified random sample (2,156 subjects; age 19-82 years old, 43.0±14.5; 1,183 male) from the general population was evaluated, in 2010, using face-to-face interviews about sociodemographic characteristics, height, weight, habitual sleep duration and time-in-bed at night on weekdays and weekend, sleep-related profiles, mood and anxiety scales, and comorbid-medical conditions...
May 19, 2017: Sleep
https://www.readbyqxmd.com/read/28523961/chronotype-and-response-to-training-during-the-polar-night-a-pilot-study
#3
Jacopo Antonino Vitale, Eva Bjoerkesett, Andrea Campana, Giacomo Panizza, Andi Weydahl
BACKGROUND: An individual's chronotype influences his or her physiological rhythms. Some studies have looked at the effect of time of day on the responses to exercise, but studies on the effect of long-term training are lacking. OBJECTIVE:  To report the effects of an 8-week training period during the polar night in non-athletes of different chronotypes living at 70°N. DESIGN:  In all, 10 morning (M), 10 neither (N) and 10 evening (E) types were recruited, and their aerobic capacity (VO2max), strength, flexibility and balance before and after the training period were tested...
2017: International Journal of Circumpolar Health
https://www.readbyqxmd.com/read/28498716/chronotype-distribution-in-professional-rugby-players-evidence-for-the-environment-hypothesis
#4
Lovemore Kunorozva, Dale E Rae, Laura C Roden
Individual sport athletes have been shown to comprise unusually high proportions of morning-types (MTs) coupled with a higher prevalence of the morningness-associated PERIOD3 variable number tandem repeat (VNTR) allele, PER3(5). The degree to which type of sport selected is influenced by either chronotype or genotype, or the extent to which sporting environment contributes to chronotype is unclear. The aim of this study was to assess chronotype and PER3 VNTR polymorphism frequencies in team sport players and non-athletic controls...
May 12, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28493061/chronotype-physical-activity-and-sport-performance-a-systematic-review
#5
REVIEW
Jacopo Antonino Vitale, Andi Weydahl
BACKGROUND: Many variables related to sport have been shown to have circadian rhythms. Chronotype is the expression of circadian rhythmicity in an individual, and three categories of chronotype are defined: morning types (M-types), evening types (E-types), and neither types (N-types). M-types show earlier peaks of several psychophysiological variables during the day than E-types. The effect of chronotype on athletic performance has not been extensively investigated. OBJECTIVE: The objective of the present review was to study the effect of chronotype on athletic performance and the psychophysiological responses to physical activity...
May 11, 2017: Sports Medicine
https://www.readbyqxmd.com/read/28491049/sleep-disturbances-in-phenylketonuria-an-explorative-study-in-men-and-mice
#6
Vibeke M Bruinenberg, Marijke C M Gordijn, Anita MacDonald, Francjan J van Spronsen, Eddy A Van der Zee
Sleep problems have not been directly reported in phenylketonuria (PKU). In PKU, the metabolic pathway of phenylalanine is disrupted, which, among others, causes deficits in the neurotransmitters and sleep modulators dopamine, norepinephrine, and serotonin. Understanding sleep problems in PKU patients may help explain the pathophysiology of brain dysfunction in PKU patients. In this explorative study, we investigated possible sleep problems in adult treated PKU patients and untreated PKU mice. In the PKU patients, sleep characteristics were compared to healthy first degree relatives by assessment of sleep disturbances, sleep-wake patterns, and sleepiness with the help of four questionnaires: Holland sleep disorder questionnaire, Pittsburgh sleep quality index, Epworth sleepiness scale, and Munich Chronotype Questionnaire...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28488899/lifetime-prevalence-of-psychiatric-morbidities-suicidality-and-quality-of-life-in-a-community-population-with-the-bimodal-chronotype-a-nationwide-epidemiologic-study
#7
Won-Hyoung Kim, Doo-Young Jung, Joo-Young Lee, Sung-Man Chang, Hong-Jin Jeon, Jun-Young Lee, Seong-Jin Cho, Dong-Woo Lee, Jae-Nam Bae, Jin Pyo Hong, Maeng-Je Cho, Bong-Jin Hahm
Chronotypes are classified as morning, evening, or intermediate, but there are reports of a bimodal type. This study was undertaken to describe the characteristics of the bimodal chronotype and to explore relationships between the bimodal type and psychiatric disorders, fatigue, and quality of life. A total of 2389 subjects from a Korean national epidemiological survey of psychiatric disorders responded during face-to-face interviews. The Korean Composite International Diagnostic Interview was used to diagnose psychiatric disorders, and the Composite Scale of Morningness was used to assess chronotypes...
May 10, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28488895/sleep-quality-chronotype-temperament-and-bipolar-features-as-predictors-of-depressive-symptoms-among-medical-students
#8
Łukasz Mokros, Andrzej Witusik, Julia Michalska, Wojciech Łężak, Michał Panek, Katarzyna Nowakowska-Domagała, Adam Antczak, Tadeusz Pietras
The assessment of risk factors is a crucial step in the prevention and treatment of affective disorders and should encompass personal dispositions. The aim of this study was to assess the value of chronotype and temperament as independent predictors of depressive symptoms among medical students. The study surveyed 140 students of the Faculty of Medicine with a battery of questionnaires: the Beck Depression Index (BDI), Hypomania Checklist 32 (HCL-32), Pittsburgh Sleep Quality Index (PSQI), Chronotype Questionnaire and Eysenck Personality Questionnaire Revised...
May 10, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28487255/disruption-of-adolescents-circadian-clock-the-vicious-circle-of-media-use-exposure-to-light-at-night-sleep-loss-and-risk-behaviors
#9
Yvan Touitou, David Touitou, Alain Reinberg
Although sleep is a key element in adolescent development, teens are spending increasing amounts of time online with health risks related to excessive use of electronic media (computers, smartphones, tablets, consoles…) negatively associated with daytime functioning and sleep outcomes. Adolescent sleep becomes irregular, shortened and delayed in relation with later sleep onset and early waking time due to early school starting times on weekdays which results in rhythm desynchronization and sleep loss. In addition, exposure of adolescents to the numerous electronic devices prior to bedtime has become a great concern because LEDs emit much more blue light than white incandescent bulbs and compact fluorescent bulbs and have therefore a greater impact on the biological clock...
May 6, 2017: Journal of Physiology, Paris
https://www.readbyqxmd.com/read/28469566/identifying-the-best-times-for-cognitive-functioning-using-new-methods-matching-university-times-to-undergraduate-chronotypes
#10
M D R Evans, Paul Kelley, Jonathan Kelley
University days generally start at fixed times in the morning, often early morning, without regard to optimal functioning times for students with different chronotypes. Research has shown that later starting times are crucial to high school students' sleep, health, and performance. Shifting the focus to university, this study used two new approaches to determine ranges of start times that optimize cognitive functioning for undergraduates. The first is a survey-based, empirical model (SM), and the second a neuroscience-based, theoretical model (NM)...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28463712/the-relationship-between-chronotype-and-depressive-symptoms-a-meta-analysis
#11
REVIEW
Jacky Au, John Reece
BACKGROUND: Expanding our understanding of the factors that influence depression is crucial for prognosis and treatment. In light of increasing evidence of an association between disrupted circadian rhythms and affective symptoms, a meta-analysis was used to examine the relationship between an eveningness chronotype and depression. METHODS: Electronic searches of the PsycINFO, Medline, Scopus, and Google Scholar databases were conducted in February 2016. Relevant reviews, related journals, and reference lists were manually searched...
April 26, 2017: Journal of Affective Disorders
https://www.readbyqxmd.com/read/28462736/spanish-adaptation-of-the-morningness-eveningness-stability-scale-improved-messi
#12
Juan F Díaz-Morales, Christoph Randler
The aim of the present study was to conduct the preliminary adaptation of the Morningness-Eveningness-Stability-Scale improved (MESSi) to Spanish population, testing its factor structure and construct validity. Participants were 261 adults (65% women; M = 31.4, SD = 12.01) who filled out measures of Morningness-Eveningness (MESSi and CSM), sleep habits, personality traits, positive and negative affect, and subjective level of alertness during the day. Psychometric results supported a three factorial model with the factors Morning Affect, Eveningness and Distinctness (RMSEA = ...
May 2, 2017: Spanish Journal of Psychology
https://www.readbyqxmd.com/read/28442311/sleep-phase-delay-in-cystic-fibrosis-a-potential-new-manifestation-of-cystic-fibrosis-transmembrane-regulator-dysfunction
#13
Judy L Jensen, Christopher R Jones, Christiana Kartsonaki, Kristyn A Packer, Frederick R Adler, Theodore G Liou
BACKGROUND: Cystic fibrosis (CF) transmembrane regulator (CFTR) protein dysfunction causes CF. Improving survival allows detection of increasingly subtle disease manifestations. CFTR dysfunction in the central nervous system (CNS) may disturb circadian rhythm and thus sleep phase. We studied sleep in adults to better understand potential CNS CFTR dysfunction. METHODS: We recruited participants from April 2012 through April 2015 and administered the Munich Chronotype Questionnaire (MCTQ)...
April 22, 2017: Chest
https://www.readbyqxmd.com/read/28430534/chronobiological-factors-for-compassion-satisfaction-and-fatigue-among-ambulatory-oncology-caregivers
#14
Daniela Bellicoso, Maureen Trudeau, Margaret I Fitch, Martin R Ralph
Primary caregivers for victims of chronic illness and or trauma experience both positive and negative emotional consequences. These are broadly classified as compassion satisfaction (CS) and compassion fatigue (CF). Because one of the components of CF, burnout, varies with chronotype and sleep quality, we assessed the influence of chronobiological features on the broader constructs of CS and CF. Responses from primary ambulatory care oncology staff working dayshifts were assessed for potential relationships of chronotype and sleep quality with CS and CF using the professional quality of life scale...
April 21, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28426387/characterization-of-bimodal-chronotype-and-its-association-with-sleep-a-population-based-study
#15
Priscila Farias Tempaku, Juliana Ramirez Arruda, Diego Robles Mazzotti, Bruno S B Gonçalves, Mário Pedrazzoli, Lia Bittencourt, Sergio Tufik
The circadian system coordinates internal events in a daily schedule to make sure that the body systems are synchronized to environmental time and internal cues. One important behavioral aspect of the circadian system is the chronotype. It is usually assessed through subjective questionnaires, being the Horne-Ostberg Morningness-Eveningness Questionnaire (MEQ) one of the most used. It classifies individuals into three major categories: morning, evening, and intermediate types. Recently, it has been hypothesized the existence of a fourth chronotype, the bimodal type, through an algorithm derived from the MEQ responses...
2017: Chronobiology International
https://www.readbyqxmd.com/read/28415855/predicting-jet-lag-in-long-haul-cabin-crew-the-role-of-illness-cognitions-and-behaviour
#16
Cristina Ruscitto, Jane Ogden
OBJECTIVE: Established risk factors for jet lag are mostly physiological including circadian preference, age, gender, the number of flight zones crossed and to some extent direction of travel. Some research has also highlighted a role for psychosocial factors including sleep, diet and 'circadian' health behaviours and illness cognitions although this remains relatively untested. The aim of this study was to evaluate the role of sleep, diet and illness cognitions in predicting perceived jet lag amongst long-haul crew...
April 18, 2017: Psychology & Health
https://www.readbyqxmd.com/read/28409690/salivary-cortisol-concentration-after-high-intensity-interval-exercise-time-of-day-and-chronotype-effect
#17
Matteo Bonato, Antonio La Torre, Marina Saresella, Ivana Marventano, Giampiero Merati, Jacopo Antonino Vitale
Due to personal and working necessities, the time for exercise is often short, and scheduled early in the morning or late in the afternoon. Cortisol plays a central role in the physiological and behavioral response to a physical challenge and can be considered as an index of exercise stress. Therefore, the aim of this study was to evaluate the influence of the circadian phenotype classification on salivary cortisol concentration in relation to an acute session of high-intensity interval exercise (HIIE) performed at different times of the day...
April 14, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28386434/repeatability-of-circadian-behavioural-variation-revealed-in-free-ranging-marine-fish
#18
Josep Alós, Martina Martorell-Barceló, Andrea Campos-Candela
Repeatable between-individual differences in the behavioural manifestation of underlying circadian rhythms determine chronotypes in humans and terrestrial animals. Here, we have repeatedly measured three circadian behaviours, awakening time, rest onset and rest duration, in the free-ranging pearly razorfish, Xyrithchys novacula, facilitated by acoustic tracking technology and hidden Markov models. In addition, daily travelled distance, a standard measure of daily activity as fish personality trait, was repeatedly assessed using a State-Space Model...
February 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/28385063/clocking-self-regulation-why-time-of-day-matters-for-health-psychology
#19
Brett M Millar
Various lines of research have identified a number of factors that can impair a person's ability and motivation to exercise self-control, here self-regulation, in the face of a tempting object (e.g., food, sex, alcohol/drugs, smoking). Each of these in-situ factors-the availability of the tempting object, one's desire for it, and impaired affective and cognitive functioning (most notably from sleep-related fatigue, daily 'wear and tear', and intoxication)-makes self-regulation more difficult, and even more so when they co-occur...
April 6, 2017: Health Psychology Review
https://www.readbyqxmd.com/read/28378787/from-lark-to-owl-developmental-changes-in-morningness-eveningness-from-new-borns-to-early-adulthood
#20
Christoph Randler, Corina Faßl, Nadine Kalb
Morningness-eveningness or chronotype changes significantly throughout the life span. This has been reported for the transition during adolescence in some studies, and to a lesser extent in early adulthood. Primary and pre-school children have been under investigation in fewer studies. This is the first comprehensive study covering the age range from very young children until early adulthood (0-30 years) based on the same measurement instrument. Here, we show that the turn towards eveningness starts at an early age in German children...
April 5, 2017: Scientific Reports
keyword
keyword
34169
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"