Relevant bibliographies by topics / Chronotype

Academic literature on the topic 'Chronotype'

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Published: 4 June 2021
Last updated: 20 February 2023

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Journal articles on the topic "Chronotype"

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Di Somma, Carolina, Elisabetta Scarano, Luigi Barrea, Domenico Solari, Enrico Riccio, Rossana Arianna, Luigi Maria Cavallo, et al. "Craniopharyngioma, Chronotypes and Metabolic Risk Profile." Nutrients 13, no. 10 (September 28, 2021): 3444. http://dx.doi.org/10.3390/nu13103444.

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Aim: To investigate the potential association among Craniopharyngioma (CP), chronotypes and metabolic risk profile. Subjects and Methods: The study population included 28 patients (46.4% males; 42.6 ± 15.8 years) and 28 controls, age, gender and BMI matched (46.4% males; 46.5 ± 12.9 years). In this study sample, we evaluated: anthropometric measurements (waist circumference, WC; BMI), plasma glucose, lipid profile, and systolic (SBP) and diastolic (DBP) blood pressure. Morningness-Eveningness was measured with the Horne-Ostberg Morningness-Eveningness Questionnaire (MEQ), which included 19 questions about preferred sleep time and daily performance. Results: in both patients and controls grade I obesity was detected in 15 subjects (53.6%), grade II obesity in 13 subjects (46.4%). In the patient group, the mean score of chronotype was 47.8 ± 12.6. In particular, 9 patients (32.1%) exhibited the morning chronotype, 6 (21.4%) the intermediate chronotype and 13 (46.4.%) the evening chronotype. No significant difference was found in gender and age among the chronotype categories. Patients with the evening chronotype had higher blood pressure values and worse metabolic parameters than those with the morning chronotype. In the control group, the mean score of the chronotype was 57.6 ± 9.5. In particular, 16 (57.1%) subjects exhibited the morning chronotype, 10 (35.7%) the intermediate chronotype and only 2 (7.1.%) the evening chronotype. The prevalence of intermediate and evening chronotypes was higher in females than males (p = 0.021), while males have a higher prevalence of the morning chronotype. Subjects with intermediate and evening chronotypes had worse metabolic parameters than those with the morning chronotype. In patients, the chronotype score was inversely correlated to WC, BMI, SBP, DBP, plasma glucose, total cholesterol, triglycerides, LDL cholesterol and positively correlated with HDL cholesterol. No correlation was found between age and chronotype. In controls, the chronotype score was inversely correlated to WC, BMI, plasma glucose, total cholesterol, LDL cholesterol. No correlation was found among chronotype and age, blood pressure, triglycerides, HDL cholesterol. Considering the whole population of the study (patients and controls), at logistic regression the chronotype score was significantly associated with the presence of CP. Conclusions: for the first time thus far, our study puts the light on the association of the CP with chronotypes and metabolic alterations in this disease, which are the main determinants of the reduced quality of life, higher morbidity and mortality in this setting of patients. This finding suggests that alterations of chronotype might represent an adjunctive risk for CP patients and a possible target for their integrate management.
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Wangsa, Cindy Leona, Nawanto Agung Prastowo, Veronica Dwi Jani Juliawati, and Francisca Tjhay. "THE DIFFERENCE IN GRADE POINTS BETWEEN MORNING AND EVENING CHRONOTYPES AMONG PRECLINICAL MEDICAL STUDENTS." Jurnal Pendidikan Kedokteran Indonesia: The Indonesian Journal of Medical Education 11, no. 2 (June 15, 2022): 148. http://dx.doi.org/10.22146/jpki.65919.

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Background: Every person has a different diurnal preference, sleep-wake cycle, and alertness known as chronotype. There are three chronotypes, that is morning, evening, and intermediate type. Medical students with evening chronotype are still forced to follow the standard academic schedule in the morning, hence their sleep time is reduced. This problem results in lower grade points since sleep quality affects academic achievement. This study aimed to analyze the difference in grade points between morning and evening chronotypes among medical students.Methods: A comparative cross-sectional study was performed among 102 preclinical students class 2018 of School Medicine and Health Sciences of Atma Jaya Catholic University Indonesia. All personal data, grade points, and chronotypes were taken using google form. Chronotypes and sleep characteristics were determined with Munich ChronoType Questionnaire (MCTQ) by calculating weekend mid-sleep time and sleep debt. Unpaired t-test and binary logistic regression were used to analyze the statistical significance.Results: The results of evening chronotype 44.1% respondents, morning chronotype 31.4% respondents, and intermediate chronotype 24.5% respondents were obtained from 102 respondents. There were 65.7% of students with grade points greater than or equal to three and 34.4% lower than three. There was no significant difference in grade points between morning and evening chronotypes on semester 1, 2, 3, nor grade point average 3 (p>0.05). Conclusion: There is no significant difference in grade points between morning and evening chronotypes among preclinical students class 2018 of School Medicine and Health Sciences Atma Jaya Catholic University of Indonesia.
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Crane, Tracy E., Austin Miller, Meghan B. Skiba, Sidney Donzella, and Cynthia A. Thomson. "Association of chronotype and pain at baseline in ovarian cancer survivors participating in a lifestyle intervention (NRG/GOG 0225)." Journal of Clinical Oncology 38, no. 15_suppl (May 20, 2020): 6018. http://dx.doi.org/10.1200/jco.2020.38.15_suppl.6018.

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6018 Background: Chronotype is defined as an individual’s propensity to sleep at a specific time in a 24-hour cycle with late chronotype associated with poorer health outcomes including cancer. Chronotype remains relatively undefined in ovarian cancer. The Lifestyle Intervention for oVarian cancer Enhanced Survival (LIVES) study is testing whether 1205 women randomized to a diet and physical activity intervention for 24-months will have longer progression-free survival versus an attention control. Here we determine the association of late and early vs mid chronotypes and patient reported outcomes (PROs), lifestyle behaviors and biomarkers of metabolic health and inflammation in ovarian cancer survivors post-treatment (≤ 6.5 months). Methods: Chronotype was determined using self-reported time to bed (early < 9 pm; mid ≥ 9 pm - ≤12 am; late > 12 am) captured through the Pittsburg Sleep Quality Index and PROs were measured using subscales of the Rand-36 questionnaire. Validated questionnaires for diet and physical activity were used and biomarkers were collected at routine clinic visits. A total subsample of 438 ovarian cancer survivors enrolled in NRG/GOG 0225- LIVES study with all available baseline measures were included in analyses. Descriptive statistics, general linear mixed models, and Pearson correlations were performed. Results: Reported pain was significantly higher in late chronotypes (P < 0.05) when compared to early and mid-chronotypes. Total sleep duration was significant between the 3 chronotypes (P < 0.05) with late chronotype experiencing less sleep (6.77 ± 1.67 hrs) than mid chronotype (7.04 ± 1.31 hrs) and early chronotype (7.56 ± 1.33 hrs). Higher reported pain was significantly correlated to poorer CRP levels (r = -0.198, P < 0.001) suggesting higher systemic inflammation and poorer blood insulin levels (r = -0.116, P < 0.05) independent of chronotype classification. All other subscales of the RAND 36 and physical activity were not associated with chronotype. Diet quality trended towards significance with a positive association observed in early and an inverse association in late chronotypes (P = 0.06). Conclusions: Late chronotypes reported higher levels of pain which was associated with poorer sleep and diet quality and higher levels of inflammation and insulin. More robust data, including actigraphy, are being analyzed and will provide additional insight of the role of circadian rhythm and phenotype on pain and key biomarkers in ovarian cancer survivors. Clinical trial information: NCT00719303.
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Kervezee, Laura, Fernando Gonzales-Aste, Philippe Boudreau, and Diane Boivin. "288 Chronotype-dependent impact of napping on sleep behavior in rotating shift workers." Sleep 44, Supplement_2 (May 1, 2021): A115—A116. http://dx.doi.org/10.1093/sleep/zsab072.287.

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Abstract Introduction Rotating shift work is known to adversely impact sleep. Napping is one of the strategies that workers can use to mitigate the effect of shift work on their sleep. In this study, we investigated the effect of chronotype on napping behavior in police officers involved in rotating shift work. Methods Actigraphy-based sleep measures and chronotype information was available from 74 police officers (20 women and 54 men; age [mean ± SD]: 32 ± 5.4 years) that participated in a 35-day field study during which they worked morning, evening, and night shifts. A generalized linear mixed model was used to assess the effect of shift type, chronotype, and their interaction on the likelihood to take a nap, adjusted for relevant covariates. In addition, linear mixed models were used to determine the effect of shift type, chronotype, and their interaction on sleep duration with and without taking into account napping duration. Results The likelihood to take a nap was influenced by an interaction between shift type and chronotype (χ2(2) = 11.2, p = 0.004). Earlier chronotype was linked to a lower likelihood to take naps during days with morning shifts and a higher likelihood during days with night shifts. Napping modulated the effect of shift type and chronotype on daily sleep duration, most notably during night shifts: while chronotype was associated with the duration of the main sleep period during night shifts, with the main sleep period being 1.7 h [95% C.I.: 0.6 – 2.8] shorter in the earliest chronotypes compared to the latest chronotypes, this effect was attenuated and no longer significant when napping duration was taken into account (difference in total sleep duration in latest chronotypes vs earliest chronotypes during nights shifts: 0.9 [−0.1 to 1.9] h). Conclusion Napping attenuates the chronotype-dependent effect of atypical work schedules on sleep duration in this population of shift-working police officers. These findings highlight the need to take into account chronotype when assessing the effect of shift work on sleep behavior. Support (if any) The Institut de recherche Robert-Sauvé en santé et en sécurité du travail (IRRST) and Fonds de Recherche du Québec–Santé (FRQS).
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Pogonysheva, Irina A., Inna I. Lunyak, and Denis A. Pogonyshev. "Annual dynamics of dispersion mapping indicators of electrocardiogram tracing in students with different chronotypes." Bulletin of Nizhnevartovsk State University, no. 2 (54) (June 20, 2021): 88–92. http://dx.doi.org/10.36906/2311-4444/21-2/11.

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The paper examines the annual profile of fluctuating microalternations of some ECG parameters in healthy students who live in northern conditions and have different chronotypes. The main method of the research was the dispersion mapping that helped assess the energy and metabolic processes in myocardium. Among male and female students, 14,3% had the morning chronotype, 50,7% had the arrhythmic chronotype, and 35% had the evening chronotype. Previously published research results showed a similar distribution of chronotypes among the population of the north: individuals with the arrhythmic chronotype dominate in the sample, the evening chronotype is the second most common, and the morning chronotype can be found in a smaller number of people. The seasonal dynamics of dispersion mapping indicators in students was analyzed. The analyses revealed an increase in the values of the Myocardium Index in students of all chronotypes in spring, with no significant deviations to be noted. The maximum values of the Heart Rate and Rhythm indicators in the annual dynamics in all students were noted in spring, and the minimum values, in summer, with significant deviations observed. The Rhythm integral indicator pointed to the signs of tension of adaptation mechanisms in the subjects with the evening chronotype in spring. Increased ECG microalterations (Myocardium, Heart Rate, Rhythm) in male and female students in spring may indicate the influence of climatic conditions that put a greater stress on the cardiovascular system in the transitional seasons. It is manifested by a change in the electrophysiological properties of the myocardium. In the subjects with the evening chronotype, the circadian rhythms of the circulatory system were more sensitive to the hypocomfortable conditions of the north.
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Palesh, Oxana, M. Melissa Packer, Holly George, Cheryl Koopman, and Pasquale F. Innominato. "Associations between morning–evening chronotype, fatigue, and QOL in breast cancer survivors." Journal of Clinical Oncology 34, no. 3_suppl (January 20, 2016): 246. http://dx.doi.org/10.1200/jco.2016.34.3_suppl.246.

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246 Background: Emerging evidence suggests that circadian disruption is associated with cancer and cancer treatments. Chronotype is defined as a behaviorally manifested preference for a certain timing of sleep and activity. Previous studies have revealed that living out of sync from one’s innate chronotype can have detrimental effects on one’s health. Although there has been research examining the associations between chronotype and health, not much is known about the relationship between chronotype, fatigue, and QOL in cancer survivors. Methods: 68 Breast cancer survivors completed questionnaires to assess their chronotype (Horne-Ostberg), to rate their fatigue (MDASI), and to evaluate their QOL (FACIT). The Horne-Ostberg questionnaire yields a range of values indicating survivors’ preference for early or late activity. The study sample was divided by terciles according to survivors’ “morningness” or “eveningness” preferences (i.e., chronotypes). Results: Morning chronotype was associated with significantly less severe tiredness and drowsiness as well as significantly better physical well-being and fatigue subscale scores as compared to evening chronotype. Tiredness median (M) scores were highest for evening chronotype (M=5.5), moderate for mid-range chronotype (M=4.5), and lowest for morning chronotype (M=3.0), a significant difference (p=0.046). Drowsiness scores were highest for evening chronotype (median=6.0), moderate for mid-range chronotype (M=4.0), and lowest for morning chronotype (M=3.0), p=0.046. The median score for physical well-being was significantly lower for evening compared to morning chronotypes (22.5 vs. 25.0, p=0.038) and morning types reported significantly better health in respect to fatigue compared to evening types (40.5 vs. 35.5, p=0.045). Conclusions: Survivors with early chronotype (early to bed, early to rise) reported less fatigue, drowsiness, and better overall physical well-being. While chronotype is believed to be genetically driven, certain behavioral, pharmacological, and bright light modifications can be used to help patients shift their circadian rhythm towards earlier morning type and may experience improvements in physical well-being.
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Barrea, Luigi, Giovanna Muscogiuri, Gabriella Pugliese, Chiara Graziadio, Maria Maisto, Francesca Pivari, Andrea Falco, Gian Carlo Tenore, Annamaria Colao, and Silvia Savastano. "Association of the Chronotype Score with Circulating Trimethylamine N-Oxide (TMAO) Concentrations." Nutrients 13, no. 5 (May 14, 2021): 1671. http://dx.doi.org/10.3390/nu13051671.

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Individual differences in the chronotype, an attitude that best expresses the individual circadian preference in behavioral and biological rhythms, have been associated with cardiometabolic risk and gut dysbiosis. Up to now, there are no studies evaluating the association between chronotypes and circulating TMAO concentrations, a predictor of cardiometabolic risk and a useful marker of gut dysbiosis. In this study population (147 females and 100 males), subjects with the morning chronotype had the lowest BMI and waist circumference (p < 0.001), and a better metabolic profile compared to the other chronotypes. In addition, the morning chronotype had the highest adherence to the Mediterranean diet (p < 0.001) and the lowest circulating TMAO concentrations (p < 0.001). After adjusting for BMI and adherence to the Mediterranean diet, the correlation between circulating TMAO concentrations and chronotype score was still kept (r = −0.627, p < 0.001). Using a linear regression analysis, higher chronotype scores were mostly associated with lower circulating TMAO concentrations (β = −0.479, t = −12.08, and p < 0.001). Using a restricted cubic spline analysis, we found that a chronotype score ≥59 (p < 0.001, R2 = −0.824) demonstrated a more significant inverse linear relationship with circulating TMAO concentrations compared with knots <59 (neither chronotype) and <41 (evening chronotype). The current study reported the first evidence that higher circulating TMAO concentrations were associated with the evening chronotype that, in turn, is usually linked to an unhealthy lifestyle mostly characterized by low adherence to the MD.
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Crane, T. E., M. B. Skiba, S. Donzella, C. A. Thomson, and S. Parthasarathy. "0414 Chronotype and Sleep Among Ovarian Cancer Survivors Participating in a Lifestyle Intervention." Sleep 43, Supplement_1 (April 2020): A158—A159. http://dx.doi.org/10.1093/sleep/zsaa056.411.

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Abstract Introduction Chronotype is defined as an individual’s propensity to sleep at a specific time in a 24-hour cycle with late chronotype associated with poorer health outcomes including cancer. The role of chronotype on lifestyle behaviors remains relatively undefined in ovarian cancer. The Lifestyle Intervention for oVarian cancer Enhanced Survival study is testing whether 1205 women randomized to a diet and physical activity intervention for 24-months will have longer progression-free survival versus attention control. Here we determine the frequency and predictors of late versus early and mid chronotypes in disease-free ovarian cancer survivors. Methods 894 ovarian cancer survivors with baseline measures were included in analyses. Chronotypes were determined using self-reported time to bed (early- &lt; 9 pm; mid- ≥ 9 pm - ≤12 am; late- &gt;12 am) captured through the Pittsburgh Sleep Quality Index. Demographic, diet and physical activity data were captured with validated questionnaires and BMI measured in clinic. Descriptive statistics and logistic regression, adjusted for smoking status and race, were performed. Results 12.4% of women were late chronotype with significant differences between chronotypes observed for race, smoking history, sleep duration, and physical activity (p &lt; 0.05). Late chronotype reported fewer hours of sleep per night (6.54 ± 1.51hrs) compared to mid (7.10± 1.31hrs) and early (7.74 ± 1.30hrs) chronotype. Blacks had higher odds of being late chronotype, OR 4.28 (95% CI 2.16-8.46). Late chronotype were more likely to report a history of smoking and lower recreational activity and had a higher mean BMI of 29.1± 6.0 kg/m2 compared to mid and early chronotype 27.8± 6.2 kg/m2 and 27.4± 5.4kg/m2, respectively. No significant differences were observed for sleep or diet quality, age, education or employment status. Conclusion Results of this analysis are consistent with other community-based population studies with regard to chronotype and race. Ovarian cancer is aggressive and late chronotype are more likely to have other risk factors that elevate risk of recurrence (obesity, tobacco use and inactivity. Six-month data are being analyzed by treatment arm and will provide important insights as to the role of sleep phase and lifestyle behaviors in this vulnerable population. Support NCT00719303; NCI R01CA186700-01A1
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Sempere-Rubio, Nuria, Mariam Aguas, and Raquel Faubel. "Association between Chronotype, Physical Activity and Sedentary Behaviour: A Systematic Review." International Journal of Environmental Research and Public Health 19, no. 15 (August 5, 2022): 9646. http://dx.doi.org/10.3390/ijerph19159646.

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Background: The aim of this systematic review is to compile and assess the scientific evidence about the relationship between chronotypes and physical activity (PA). Methods: A systematic review was executed using a structured electronic search in PubMED, Cochrane Library, PsycInfo and Trip Database. The searches employed keywords such as chronotype, sleep, acrophase, chronotype preference, morningness, physical activity and sedentary, using MeSH terms. JBI critical tools were used to appraise methodological aspects. Results: This systematic review includes 23 studies and a total of 505,375 participants. The results show that evening chronotypes are associated with less PA and more time in sedentary activities. It occurs independently of the instruments used to collect information about chronotype and PA. Nevertheless, this association could be mitigated in young populations and university stages. Conclusions: The chronotypes are clearly associated with the PA level and the sedentary behaviour, especially in the population over their mid-twenties. Evening chronotypes are associated with less PA and more time in sedentary activities compared to morning chronotypes.
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Sansom, K., J. Walsh, P. Eastwood, K. Maddison, B. Singh, A. Reynolds, J. McVeigh, D. Mazzotti, and N. McArdle. "P124 Chronotype and OSA combine to modify risk of hypertension." SLEEP Advances 2, Supplement_1 (October 1, 2021): A61—A62. http://dx.doi.org/10.1093/sleepadvances/zpab014.165.

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Abstract Introduction There are limited data on the association of chronotype and hypertension and on their interaction on hypertension. This study aimed to investigate the independent and combined effects of chronotype and OSA on risk for prevalent hypertension in a middle-aged community population. Methods Baseline data on adult participants (n=1098, female=58%; age mean [range]=56.7[40.8–80.6] years) from an Australian community cohort study were analysed. Shift workers and individuals with incomplete data were excluded. Prevalent hypertension was defined as ‘doctor diagnosed’ and/or an elevated average systolic blood pressure (BP; ≥140mmHg) or diastolic BP (≥90mmHg). OSA was diagnosed when apnoea hypopnoea index (AHI) ≥10 events/hour from in-laboratory polysomnography. Chronotype was determined from actigraphy mid-sleep time on work free days. Tertiles of mid-sleep time were used to categorise morning, intermediate and evening chronotypes. Logistic regression (adjusted for sex, body mass index, age, alcohol consumption and sleep duration) were used to assess the cross-sectional relationship between chronotype, OSA and hypertension. Results After applying exclusion criteria 496 participants were analysed (female=58%; age mean[range]=57.0[42.1–81.6] years). All those with OSA had greater odds of hypertension than those without and there was no difference in risk of hypertension according to chronotype. Compared to morning chronotypes with no OSA (n=84), evening chronotypes with OSA (n=79) had non-significantly increased odds (OR 2.15, 95% CI 1.00–4.76; P=0.054) for hypertension while morning chronotypes with OSA (n=82) had significantly increased odds (OR 3.02, 95% CI 1.44–6.58; P=0.004). Discussion Morning chronotypes with OSA might be at increased risk of hypertension compared to evening chronotypes with OSA.
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Dissertations / Theses on the topic "Chronotype"

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Böhm, Stephanie. "Sleep and chronotype in adolescents." Diss., lmu, 2012. http://nbn-resolving.de/urn:nbn:de:bvb:19-141907.

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Juda, Myriam. "The Importance of Chronotype in Shift Work Research." Diss., lmu, 2010. http://nbn-resolving.de/urn:nbn:de:bvb:19-118146.

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Kohlhoff, Enno Ole. "Circadiane Variationen von Aufmerksamkeitsfunktionen bei extremen Chronotypen." Doctoral thesis, Universitätsbibliothek Leipzig, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-154780.

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Die Leistungsfähigkeit vieler kognitiver Funktionen zeigt tageszeitliche Schwankungen, welche auf dem Zusammenspiel der im 2-Prozess-Modell der Schlafregulation beschriebenen Prozes- se basieren: dem homöostatischen Schlafdruck (Prozess S) sowie dem circadianen Schrittma- cher (Prozess C). Darüberhinaus existieren verschiedene Chronotypen, welche oftmals einen synchrony-effect, also eine bessere Leistung zu für sie optimalen Tageszeiten im Vergleich zu nicht-optimalen Tageszeiten, zeigen. In der vorliegenden Arbeit wurde untersucht, in- wieweit die Leistungsfähigkeit der mittels des Attention Network Task (ANT) gemessenen Aufmerksamkeitsfunktionen tonische und phasische Alertness, Orientierung und exekutive Aufmerksamkeit aufgrund homöostatischer und circadianer Faktoren bei extremen Chrono- typen tageszeitabhängige und/oder chronotypabhängige Variationen unter synchronisierten Bedingungen (also einem normalen Tag-Nacht-Rhythmus) mit selbstgewählten Schlafzeiten zeigen. Zu diesem Zweck wurden je 20 ausgeprägte Morgen- bzw. Abendtypen zu fünf ver- schiedenen Uhrzeiten (9:00, 12:00, 15:00, 18:00 und 21:00 Uhr) in randomisierter Reihenfolge getestet. Phasische Alertness, Orientierung sowie die exekutive Aufmerksamkeit zeigten sich bei beiden Chronotypen im Tagesverlauf stabil. Die in einer ähnlichen Studie gefundenen Schwankungen der phasischen Alertness der Morgen-/Neutraltypen sowie der exekutiven Auf- merksamkeit bei beiden Chronotypen konnten nicht repliziert werden, was wahrscheinlich auf eine unterschiedliche Einteilung in Chronotypgruppen sowie ein unterschiedliches Studiende- sign zurückzuführen ist. Möglicherweise kann dies aber auch darauf hinweisen, dass es sich bei der Chronotyp-Dimension auf behavioraler Ebene nicht um ein Kontinuum handelt. Wäh- rend die tonische Alertness bei den Morgentypen gleich blieb, zeigte sich bei den Abendtypen ein synchrony-effect, d.h. sie zeigten eine Verbesserung der Leistung im Tagesverlauf, wobei nicht auszuschließen ist, dass neben der nicht-optimalen circadianen Phase der Abendtypen am Morgen auch sleep inertia sowie partielle Schlafdeprivation zu diesem Verlauf beigetragen haben können. Darüberhinaus zeigten die Morgentypen unabhängig von der Tageszeit eine generell schlechtere Orientierungsfunktion als die Abendtypen, was die Hypothese einer ver- schiedenartigen hemisphärischen Dominanz bei den verschiedenen Chronotypen unterstützt. Die Ergebnisse der vorliegenden Studie unterstützen die These, dass verschiedene kognitive Prozesse selektiv durch homöostatische und circadiane Prozesse moduliert werden, da selbst so ähnliche Funktionen wie die tonische und die phasische Alertness unterschiedliche Ver- läufe zeigen und in einer früheren Studie Schwankungen der phasischen Alertness und der exekutiven Aufmerksamkeit bei moderaten Morgen-/Neutraltypen bzw. moderaten Abendty- pen beschrieben wurden. Ob die unterschiedlichen Ergebnisse der vorliegenden und früherer Studien tatsächliche Unterschiede zwischen verschiedenen Chronotypen reflektieren oder Un- terschieden des jeweiligen Studiendesigns geschuldet sind, ist in weiterführenden Studien zu untersuchen.
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Shawa, Nyambura. "Chronotype in the South African population: the influence of longitudinal location." Master's thesis, University of Cape Town, 2014. http://hdl.handle.net/11427/13321.

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Includes bibliographical references.
Most human beings experience the pull of three different daily timers, the solar clock, their endogenous circadian clock and the societal clock. Solar time is generated by the Earth’s revolution on its axis, resulting in its surface being alternately exposed to and shielded from the sun every 24 hours. The endogenous clock, or circadian oscillator, is driven by a network of transcriptional translational feedback loops, and has a period of close to 24 hours. The circadian oscillator is synchronised to the 24 hour light-dark cycle of the solar clock. The third timer is the standardised societal clock that organises and schedules work, school, transport, appointments and free time in a 24 hour period. The way an individual’s endogenous clock synchronises to the solar clock, through advances or delays relative to sunrise and sunset, results in a phenomenon known as diurnal preference or chronotype. A person may have a morning-chronotype, where they enjoy rising and being active early in the day, an evening-chronotype where they prefer to be active later in the day into the late night, retiring in the early morning hours, or have no strong preference for early or late rising. This renders it easy for some to cope with the demands of the societal clock and others to struggle. Chronotype has both genetic and environmental influences. As society’s schedule is governed by the standardised clock, it was hypothesised that chronotype may be influenced by one’s longitudinal location within a time zone. South Africa presents an interesting case because although it uses just one time zone, in the most Easterly regions of the country, the sun rises and sets up to an hour earlier than in the most Westerly regions throughout the year. Sunrise times have an impact on the way the endogenous clock synchronises to the solar clock. It was hypothesised firstly, that South Africans living in the East of the country may have a greater preference for mornings (more morningchronotypes) than those living in the West; and secondly, that this difference would not be due to genetic differences in the populations, particularly two gene polymorphisms previously shown to influence chronotype. Therefore the aims of this study were to describe and compare the distribution of chronotype in Eastern (n=222) and Western (n=205) sample populations with the use of a validated tool, the Horne–Östberg Morningness, Eveningness Questionnaire. Secondly to describe the genotype and allelic frequency distributions of the PER2 single nucleotide polymorphism (SNP) G3853A (rs934945) in the Eastern (n= 184) and Western (n=186) populations, and the PER3 variable number tandem repeat (VNTR) polymorphism in the Eastern (n=143) and Western (n=176) populations from buccal cell samples. There was a significantly higher proportion of morning-types in the Eastern population (60.6%) than in the Western population (40.5%) (p<0.001). Whereas there were higher proportions of neither-types and evening-types in the Western population (50.8% and 8.7% respectively) than in the Eastern population (35.1% and 4.3% respectively) (p<0.001). There were no significant differences in distribution of the PER2 genotype (p=0.121) and allele frequencies (p=0.051) between the Eastern and Western populations nor in the PER3 genotype (p=0.879) and allele (p=0.075) frequencies. Although previous studies have shown associations between chronotype and PER2 G3853A and PER3 VNTR genotypes, no significant associations were observed in either the Eastern (PER2 p=0.769; PER3 p=0.221) or the Western (PER2 p=0.584; PER3 p=0.733) populations. These findings indicate that, in South African populations, longitude influences chronotype independently of genotype. Factors that may contribute to this may be the difference in the rising times of the sun, which is exacerbated to some extent by the study areas being at dissimilar latitudes and thus experiencing slight differences in climate. The impact of the differences in chronotype but the maintenance of the same societal temporal organisation in the Eastern and Western regions were not assessed. However, they may be revealed by investigating certain general health indicators in such as quality of sleep and prevalence of depressive symptoms which are affected when there is incongruence between societal time and endogenous time.
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Couto, Diana Almeida. "Questionário de cronótipo em crianças: adaptação portuguesa do Children's Chronotype Questionnaire." Master's thesis, Universidade de Aveiro, 2011. http://hdl.handle.net/10773/7488.

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Mestrado em Psicologia - Psicologia Clínica e da Saúde
Os Ritmos Circadianos apresentam uma complexa e organizada hierarquia (Borisenkov, 2010; Hofstra, & de Weerd, 2008), têm uma periodicidade próxima de um dia e esta designação foi primeiramente utilizado por Franz Halberg em 1959, para descrever ritmos endógenos com um período próximo de 24h. O estabelecimento da fase circadiana por parte do relógio biológico constitui uma estratégia adaptativa importante (Marques, & Menna-Barreto, 2003). O Tipo Diurno tem a ver com um padrão individual de distribuição dos parâmetros circadianos pelo nictómero (Gomes, 2005); é uma característica individual relativamente estável, especificamente relacionada com a acrofase dos ritmos circadianos. Hörne e Ostberg (1976, cf. Evans, 2010) definiram 5 categorias de Tipos Diurnos, distribuídas ao longo de um continuum, em que cada categoria apresenta características distintivas. O Questionário de Cronótipo em Crianças (QCTC) constitui uma adaptação portuguesa do Children’s Chronotype Questionnaire (CCTQ), publicado em 2009 por H. Werner, M. K. LeBourgeois, A. Geiger e O. Jenni. O CCTQ é um questionário composto por 27 itens, destina-se a ser respondido por pais e encarregados de educação de crianças entre os 4 e os 11 anos de idade e permite determinar 3 medidas: Ponto Médio de Sono em Dias Livres (e o Ponto Médio de Sono corrigido em Dias Livres), Matutinidade/Vespertinidade e Cronótipo. Inicialmente foram pedidas autorizações à entidade portuguesa responsável pela administração de questionários em meio escolar, bem como aos Agrupamentos de Escolas onde se pretendia recolher a amostra. Foi elaborada uma primeira tradução, que foi submetida à análise de diversos peritos; com base nas suas sugestões, foi criada uma nova versão, que foi administrada num conjunto de pais para “Reflexão Falada” (Almeida & Freire, 2008). Finalmente, com base nos seus comentários, foi concebida a versão experimental portuguesa e administrada em dois Agrupamentos de Escolas. A amostra foi constituída por 397 crianças, 187 (47,1%) do sexo masculino e 209 (52,6%) do sexo feminino, dos 4 aos 11 anos de idade, que frequentavam desde o Jardim de Infância até ao 6º ano de escolaridade Apresentam-se e discutem-se os resultados encontrados no nosso estudo e a sua comparação com os resultados obtidos por Werner e colaboradores, assim como as principais limitações encontradas e sugestões para futuros trabalhos.
Circadian Rhythms show a complex and organized hierarchy (Borisenkov, 2010; Hofstra, & de Weerd, 2008), have a frequency close to one day and this designation was first used by Franz Halberg in 1959 to describe endogenous rhythms with a period near to 24h. The establishment of the circadian phase by the biological clock is an important adaptive strategy (Marques, & Menna-Barreto, 2003). Diurnal Preference is related with the pattern of distribution of individual circadian parameters on the light/dark cycle (Gomes, 2005); more exactly, it is a relatively stable individual characteristic, defined by the acrophase of the circadian rhythms. Hörne and Östberg (1976, cf. Evans, 2010) defined five categories of Diurnal Preference, distributed along a continuum, in which each class has distinctive categories. The Questionário de Cronótipo em Crianças (QCTC) is an adaptation to the Portuguese population of the Children’s Chronotype Questionnaire (CCTQ), published in 2009 by H. Werner, M. K. LeBourgeois, A. Geiger and O. Jenni. The CCTQ is a questionnaire comprising 27 items, answered by parents of 4- to 11-year-old children, and consists of 3 scales: Midsleep Point on Free Days (and Corrected Midsleep Point on Free Days), Morningness/Eveningness and Chronotype. Firstly it was requested permission to the responsible Portuguese entity for administration of questionnaires in schools, as well as to school clusters where it was intended to collect the sample. A first translation was prepared, which was analyzed by various experts; based on their suggestions, it was created a new version, which, in turn, was given to a group of parents. Finally, based on their comments, the Portuguese experimental version was prepared and administered in two school clusters. The sample included 397 children, 187 (47,1%) males and 209 (52,6%) females, aged 4 to 11 years-old, who attended school from kindergarten to 6th grade. Comparisons between the results obtained by Werner and colleagues and the results obtained in this study are presented, as well as the main constraints encountered and suggestions for future studies.
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Nechytailo, Y. M. "Blood pressure in children and its biorithmological features depending on the child chronotype." Thesis, БДМУ, 2021. http://dspace.bsmu.edu.ua:8080/xmlui/handle/123456789/19152.

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Böhm, Stephanie [Verfasser], and Till [Akademischer Betreuer] Roenneberg. "Sleep and chronotype in adolescents : a chronobiological field study / Stephanie Böhm. Betreuer: Till Roenneberg." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2012. http://d-nb.info/1022318624/34.

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Simon, Tarek. "Impact du chronotype sur les paramètres du sommeil en fonction de l'horaire de travail." Doctoral thesis, Université Laval, 2015. http://hdl.handle.net/20.500.11794/26002.

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Tableau d’honneur de la Faculté des études supérieures et postdoctorales, 2015-2016
Le présent mémoire vise à évaluer l’association entre le chronotype et les difficultés de sommeil en lien avec l’horaire de travail. À cette fin, 116 travailleurs du réseau de la santé de la ville de Québec ont complété le questionnaire de chronotype de Horne et Ostberg (MEQ; 1976) en plus de remplir quotidiennement un agenda du sommeil sur une période de 2 semaines. Les participants ont été comparés selon leur horaire de travail (travailleurs de jour n = 43; travailleurs de nuit n = 73) et selon leur chronotype (du matin n = 37; neutre n = 59; du soir n = 20) pour déterminer les effets indépendants et interactifs de ces variables sur la durée du sommeil durant la période de sommeil principale, la durée du sommeil sur une période de 24 heures et la somnolence après le travail. Tel que postulé initialement, les résultats indiquent que le chronotype et l’horaire de travail ont un effet sur la période de sommeil principale, mais pas sur le sommeil au cours de 24 heures, de sorte que les travailleurs de nuit ont une période de sommeil principale qui est significativement plus courte que celle des travailleurs de jour. De plus, le raccourcissement de la période de sommeil principale après le travail de nuit semble principalement observable chez les travailleurs avec un chronotype du matin ou un chronotype neutre, un patron de résultats qui concorde avec les connaissances actuelles sur le rythme circadien et qui corrobore plusieurs études antérieures. Le fait que tous les travailleurs ont obtenu une durée du sommeil équivalente sur une période de 24 heures suggère qu’il est possible de compenser pour une période de sommeil principale écourtée, en prenant des siestes. Ainsi, les résultats obtenus dans le présent mémoire mettent en évidence l’importance des siestes chez les travailleurs de nuit, surtout ceux et celles avec une prédisposition matinale. Enfin, l’absence de différence entre les groupes quant au niveau de somnolence après le travail suggère que la somnolence excessive n’est pas un problème qui se limite au travail de nuit.
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Thomas, J. Matthew. "CIRCADIAN RHYTHM PHASE SHIFTS CAUSED BY TIMED EXERCISE VARY WITH CHRONOTYPE IN YOUNG ADULTS." UKnowledge, 2019. https://uknowledge.uky.edu/khp_etds/64.

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The circadian system controls 24-hour cycles of behavior and physiology, such as rest-activity and feeding rhythms. The human circadian system synchronizes with, or entrains to, the light/dark cycle (sunrise/sunset) to promote activity and food consumption during the day and rest at night. However, strict work schedules and nighttime light exposure impair proper entrainment of the circadian system, resulting in chronic circadian misalignment. Numerous studies have shown that chronic circadian misalignment results in poor health. Therefore, therapeutic interventions that could shift circadian rhythms and alleviate circadian misalignment could broadly impact public health. Although light is the most salient time cue for the circadian system, several laboratory studies have shown that exercise can also entrain the internal circadian rhythm. However, these studies were performed in controlled laboratory conditions with physically-active participants. The purpose of this study was to determine whether timed exercise can phase advance (shift earlier) the internal circadian rhythm in sedentary subjects in free-living conditions. Fifty-two young, sedentary adults (16 male, 24.3±0.76 yrs) participated in the study. As a marker of the phase of the internal circadian rhythm, we measured salivary melatonin levels (dim light melatonin onset: DLMO) before and after 5 days of timed exercise. Participants were randomized to perform either morning (10h after DLMO) or evening (20h after DLMO) supervised exercise training for 5 consecutive days. We found that morning exercisers had a significantly greater phase advance than evening exercisers. Importantly, the morning exercisers had a 0.6h phase advance, which could theoretically better align their internal circadian rhythms with the light-dark cycle and with early-morning social obligations. In addition, we also found that baseline DLMO, a proxy for chronotype, influenced the effect of timed exercise. We found that for later chronotypes, both morning and evening exercise advanced the internal circadian rhythm. In contrast, earlier chronotypes had phase advances when they exercised in the morning, but phase delays when they exercised in the evening. Thus, late chronotypes, who experience the most severe circadian misalignment, may benefit from exercise in the morning or evening, but evening exercise may exacerbate circadian misalignment in early chronotypes. Together these results suggest that personalized exercise timing prescriptions based on chronotype could alleviate circadian misalignment in young adults.
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Henst, Rob. "The role of chronotype in the participation and performance of South African and Dutch marathon runners." Master's thesis, University of Cape Town, 2014. http://hdl.handle.net/11427/13131.

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Introduction: Our circadian rhythms are internal biological rhythms of approximately (circa) 24 - hours (dies) allowing us to synchronize our internal biological “clock” with external time cues. Many innate biological functions are dependent on time-of-day, such as secreting adrenaline and cortisol in the mornings and melatonin in the evenings. The time-of-day at which these and other physiological functions are active, change or reach a certain level may influence a person’s diurnal preference, i.e. preference for mornings (morning-types) or evenings (evening-types), and is referred to as ‘chronotype’. Many different factors may affect a person’s chronotype, including age, sex, physical activity, ethnicity and geographical location. Certain clock-related genotypes have also been shown to be associated with chronotype. For example, some studies have found that the 5-repeat allele of the PER3 variable number tandem repeat (VNTR) polymorphism (PER35) is associated with a preference for mornings. Recent research has shown a high prevalence of morning-types and PER35VNTR allele carriers in trained South African runners, cyclists and triathletes. It was proposed that the early morning start-times of these endurance events might select people with a preference for mornings, since morning-types may cope better with rising early and being physically active in the early morning. Alternatively, the habitual early waking for training or endurance events may have conditioned the athletes to adapt to become morning-types. However, the geographical location of South Africa (i.e. climate and day length) and the fact that each group was physically active may also have contributed to this finding. Comparison of South African and Dutch runners would allow us to explore the effects of race start time and geography on this observation, since marathons in The Netherlands on average start at 11:41, and since the two countries differ significantly in latitude and as such have noticeable differences in daylight exposure. Aims: The aims of this study were 1) to compare the PER3VNTR genotype and chronotype distribution of South African and Dutch recreational marathon runners and active but non-competitive controls; 2) to investigate the relationship between the PER3VNTR genotype and chronotype in both the Dutch and South African samples; and 3) to determine whether marathon race time is associated with chronotype and PER3VNTR genotype in Dutch and South African marathon Methods: Ninety-five trained South African male marathon runners, 97 South African male active but non-competitive controls, 90 trained Dutch male marathon runners and 98 Dutch male active but non-competitive controls completed a questionnaire capturing demographics, training and race history, including personal best and most recent full and half-marathon race time (if applicable) and the Horne-Östberg morningness-eveningness personality questionnaire (HÖ-MEQ, a tool to assess a person’s chronotype). Each participant provided a buccal cell swab from with total genomic DNA was extracted to determine his PER3VNTR polymorphism genotype. The official race time from each runner who completed the designated marathons in South Africa or the Netherlands was collected from the event websites. Results: The South African and Dutch runners were more morning-orientated than their respective control groups and the South African runners were more morning-orientated than the Dutch runners. The PER3 VNTR polymorphism distribution was similar between the four groups and was not associated with chronotype. The marathon performance of the morning-type South African runners was better than the evening-types, and a higher HÖ-MEQ score (morningness) correlated with better personal best and most recent half-marathon race time. Similar observations were not found in the Dutch runners. Discussion: Since a higher prevalence of morning-types in South African marathon runners compared to Dutch marathon runners was found, it is proposed that the early marathon start-times in South Africa may favour morning-types, who are able to cope with those early morning start times. Alternatively, one could argue that through repetitive early-morning racing (i.e. participating in competitive running events), the chronotype of South African runners may be conditioned to that of a morning-type over time. It is proposed that this ability to cope with early morning marathon start times may lead to better marathon performances for morning-types than neither-types and evening-types in the South African running group. This effect does not occur in the Netherlands, where marathons start later in the morning and do thus not favour a certain chronotype. The difference in daylight exposure between the two countries as a function of latitude does not seem to affect chronotype, since the active but non-competitive control groups did not differ significantly between South Africa and the Netherlands. Unlike the findings from a previous study, the PER35allele was not more prevalent among the South African runners, but rather the distribution wasi n line with what has been described in most, but not all, other populations. No association between the PER35VNTR xpolymorphism and chronotype was found in any of the four groups. Since the four groups investigated in this study comprised physically active individuals, it is proposed that this lack of association may be due to the habituation effects of physical activity and early morning start times of marathon events(for only the South African runners). Conceivably,this habituation may even shift the diurnal preference of those with the PER34/5 and PER34/4VNTR genotypes towards morningness, disassociating any relationship between chronotype and the PER3VNTR genotype. Conclusion: The early morning start time of South African marathon events may favour morning-types, due to their ability to cope with being physically active in the early morning. We propose that the PER3VNTR genotype cannot solely explain the higher prevalence of morning-types in the South African runners in this study, however, it is very likely that the PER3VNTR genotype does play an important role in the chronotype distributions found in the study of Kunorozva et al.(2012). Since the PER3VNTR genotype was not associated with chronotype in any of the four groups, it is proposed that habituation to early-morning marathon racing may be the causal effect of the high number of morning-types in the South African runners group, and the apparent disassociation between chronotype and the PER3VNTR genotype. We also propose that the habituation effect of physical activity and training time-of-day on chronotype in the other groups may dissociate the PER3VNTR genotype with chronotype in a similar manner to which the early-morning start times of South African endurance events dissociates the two. No effect of geographical location on chronotype was found when comparing the Dutch and the South African groups. The morning-orientated South African runners seem to perform better in marathon running than the more evening-orientated runners do, which may be caused by their ability to cope with these early-morning marathon events. Further studies may explore whether marathon performance in later chronotypes can be improved by training-based habituation.
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Books on the topic "Chronotype"

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Smethurst, Paul. The postmodern chronotype: Reading space and time in contemporary fiction. Amsterdam: Rodopi, 2000.

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Michael, Hays K., and Centre canadien d'architecture, eds. Hejduk's chronotope. New York: Princeton Architectural Press [for the] Canadian Centre for Architecture, 1996.

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1951-, Cooke Lynne, Dia Art Foundation, and Hispanic Society of America, eds. Chronotopes & dioramas. New York: Dia Art Foundation, 2010.

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B, Bender John, and Wellbery David E, eds. Chronotypes: The construction of time. Stanford, Calif: Stanford University Press, 1991.

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Piero, Mike. Video Game Chronotopes and Social Justice. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-91944-3.

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Bemong, Nele. Bakhtin’s Theory of the Literary Chronotope: Reflections, Applications, Perspectives. Gent: Academia Press, 2010.

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Montgomery, Michael V. Carnivals and commonplaces: Bakhtin's chronotope, cultural studies, and film. New York: P. Lang, 1993.

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Bakhtin's Theory of the Literary Chronotope : Reflections, Applications, Perspectives (2008 Brussels, Belgium). Bakhtin's theory of the literary chronotope: Reflections, applications, perspectives. Gent: Ginko, Academia Press, 2010.

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Bemong, Nele. Bakhtin’s Theory of the Literary Chronotope: Reflections, Applications, Perspectives. Gent: Academia Press, 2010.

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Bemong, Nele. Bakhtin’s Theory of the Literary Chronotope: Reflections, Applications, Perspectives. Gent: Academia Press, 2010.

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Book chapters on the topic "Chronotype"

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Randler, Christoph. "Chronotype and Social Behavior." In Sleep, Personality, and Social Behavior, 33–40. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-30628-1_3.

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Shahid, Azmeh, Kate Wilkinson, Shai Marcu, and Colin M. Shapiro. "Munich Chronotype Questionnaire (MCTQ)." In STOP, THAT and One Hundred Other Sleep Scales, 245–47. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-9893-4_58.

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Randler, Christoph. "The Concept of Chronotype in Eating Behaviors." In Handbook of Behavior, Food and Nutrition, 771–82. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-0-387-92271-3_51.

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Merikanto, Ilona. "Chronotypes." In Encyclopedia of Personality and Individual Differences, 660–62. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-319-24612-3_738.

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Merikanto, Ilona. "Chronotypes." In Encyclopedia of Personality and Individual Differences, 1–3. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-28099-8_738-1.

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Nogués-Pedregal, Antonio Miguel. "Chronotope." In Encyclopedia of Tourism, 153–54. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-01384-8_246.

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Nogués-Pedregal, Antonio-Miguel. "Chronotope." In Encyclopedia of Tourism, 1–2. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-01669-6_246-1.

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Peter, Helga, and Thomas Penzel. "Chronotyp." In Springer Reference Medizin, 1. Berlin, Heidelberg: Springer Berlin Heidelberg, 2020. http://dx.doi.org/10.1007/978-3-642-54672-3_394-1.

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Rodríguez Ferrante, Guadalupe, Andrea Paula Goldin, and María Juliana Leone. "The Perfect Hurricane in Latin America: School Start Time, Chronotype, Sleep, and Academic Performance During Adolescence." In Cognitive Sciences and Education in Non-WEIRD Populations, 207–26. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-06908-6_13.

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De Fina, Anna. "The chronotope." In Handbook of Pragmatics, 49–65. Amsterdam: John Benjamins Publishing Company, 2022. http://dx.doi.org/10.1075/hop.25.chr1.

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Conference papers on the topic "Chronotype"

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Zaharinova, Maria, Nikolay Zaekov, Krassimir Rankov, and Milena Nikolova. "CHRONOTYPE IDENTIFICATION OF BULGARIAN SPORTS STUDENTS." In INTERNATIONAL SCIENTIFIC CONGRESS “APPLIED SPORTS SCIENCES”. National Sports Academy "Vassil Levski", 2017. http://dx.doi.org/10.37393/icass2017/64.

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Zaaharinova, Mariya, Nikolay Zaekov, Krassimir Rankov, and Milena Nikolova. "ASSOCIATION BETWEEN CHRONOTYPE, STRESS, AND GENDER IN BULGARIAN SPORTS STUDENTS." In INTERNATIONAL SCIENTIFIC CONGRESS “APPLIED SPORTS SCIENCES”. Scientific Publishing House NSA Press, 2022. http://dx.doi.org/10.37393/icass2022/82.

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ABSTRACT Introduction: There are many internal and external factors (like chronotype, stress, gender, and level of activity) that may affect athletes performances. The aim of this study was to evaluate the association between chronotype, perceived stress, and gender in Bulgarian sports students. Methodology: In total, 29 male and female university students were surveyed using the Horne and Ostberg Morningness and Eveningness questionnaire (1976) and the Perceived Stress Scale (1983). Results: Mann-Whitney U test showed an association between perceived stress scores and chronotype groups. Moderate evening type perceived more stress than intermediate type (p = 0,01). Also, students with high physical activity were more stressed than students with moderate physical activity (p = 0,06) and females were more stressed than males (p = 0,01). Students identified as moderate evening type (n = 7) were more than moderate morning type (n = 1) in the sample. Discussion: Surprisingly, most of the moderate evening-type subjects (n = 7) were females (n = 5). Usually, males tend to be moderate evening types. Of these 5 females, 2 were with a moderate level of activity, and 1 was with a high level. And they perceived more stress than males. Conclusions: Collectively, these results show that chronotype and gender can affect susceptibility to stress in sports students from different levels of activity. Also, training schedules should not be arranged without taking into account circadian preferences.
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Gomes, A. M. "Sleep Quality And Chronotype Of Portuguese School-Aged Children." In 6th icCSBs October 2017 The Annual International Conference on Cognitive - Social, and Behavioural Sciences. Cognitive-Crcs, 2017. http://dx.doi.org/10.15405/epsbs.2017.11.1.

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ALEXANDRE DOS SANTOS, CLESTON, GRACIELE LIMA SAMPAIO, PAULO ROBERTO DA CUNHA, and CARLOS ROBERTO DE OLIVEIRA NUNES. "INFLUENCE OF CHRONOTYPE IN JUDGMENT AND DECISION-MAKING IN AUDIT." In 15th CONTECSI International Conference on Information Systems and Technology Management. TECSI, 2018. http://dx.doi.org/10.5748/9788599693148-15contecsi/ps-5906.

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Hulsegge, Gerben, Susan Picavet, Allard van der Beek, Monique Verschuren, Jos Twisk, and Karin Proper. "0125 Shift work, chronotype and the risk of cardiometabolic disturbances." In Eliminating Occupational Disease: Translating Research into Action, EPICOH 2017, EPICOH 2017, 28–31 August 2017, Edinburgh, UK. BMJ Publishing Group Ltd, 2017. http://dx.doi.org/10.1136/oemed-2017-104636.97.

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Mokros, Łukasz, Joanna Miłkowska - Dymanowska, Łukasz Gwadera, Tadeusz Pietras, Paweł Górski, and Wojtek J. Piotrowski. "Personality and chronotype as predictors of sarcoidosis-associated fatigue - a cross-sectional study." In ERS International Congress 2020 abstracts. European Respiratory Society, 2020. http://dx.doi.org/10.1183/13993003.congress-2020.3015.

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Haldar, Prasun, Smriti Debnath, Santi Gopal Maity, Ritabrata Mitra, Moumita Biswas, Soumya Bhattacharjee, Sujoy Saha, et al. "Association between asthma and allergic diseases and circadian preference (chronotype) of the adolescents." In ERS International Congress 2019 abstracts. European Respiratory Society, 2019. http://dx.doi.org/10.1183/13993003.congress-2019.pa2783.

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Nguyen, Holly. "Personalizing a sleep health APP for college students using personality traits and chronotype." In 2016 IEEE MIT Undergraduate Research Technology Conference (URTC). IEEE, 2016. http://dx.doi.org/10.1109/urtc.2016.8284084.

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Lewis, Katie JS, Alexander Richards, Robert Karlsson, Ganna Leonenko, Samuel E. Jones, Hannah Jones, Katherine Gordon-Smith, et al. "P017 Differences in genetic risk for insomnia, hypersomnia and chronotype in bipolar disorder subtypes." In BSS Scientific Conference Abstract Book, Birmingham, England. British Thoracic Society, 2019. http://dx.doi.org/10.1136/bmjresp-2019-bssconf.17.

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Lin, Che-Wei, Jeffrey Gamble, Ya-Ting Yang, and Jeen-Shing Wang. "Estimating the influence of chronotype and social zeitgebers on circadian rhythms using an accelerometer-based sensor network." In 2012 IEEE-EMBS International Conference on Biomedical and Health Informatics (BHI). IEEE, 2012. http://dx.doi.org/10.1109/bhi.2012.6238549.

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