{"title":"Self-reported preferences for seasonal daylight saving time meet fundamentals of human physiology: Correlations in the 2018 public consultation by the European Commission.","authors":"José María Martín-Olalla, Jorge Mira","doi":"10.1080/07420528.2025.2456562","DOIUrl":"https://doi.org/10.1080/07420528.2025.2456562","url":null,"abstract":"<p><p>We analyze the results to question 2 (individual preferences for cancelling or keeping the current clock regulations) from the 2018 Public Consultation on summertime arrangements (DST) conducted by the European Commission. We reveal correlations in the shares of population for cancelling the regulations and the winter sunrise time (SRW) [<i>R</i><sup>2</sup> = 0.177; <i>p</i> = 0.03; <i>N</i> = 25] and the onset of human activity [<i>R</i><sup>2</sup> = 0.677; <i>p</i> = 5 × 10<sup>-5</sup>; <i>N</i> = 17]. The results are in line with the rationale behind the regulations in the range of latitude 35 to 63: larger values of SRW (larger latitude) brought larger shares against the regulations; and earlier onset of human activity relative to SRW brought larger shares against the regulations. The shares for cancelling the regulation did not show correlations with time offset (position in time zone), thus challenging the current view within the circadian community.</p>","PeriodicalId":10294,"journal":{"name":"Chronobiology International","volume":" ","pages":"1-5"},"PeriodicalIF":2.2,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143045644","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"General procrastination associated with the evening preference in healthy people but not with circadian rhythm sleep-wake disorders with phase delay.","authors":"Masaki Takeuchi, Marina Hirose, Nakao Iwata, Tsuyoshi Kitajima","doi":"10.1080/07420528.2025.2456563","DOIUrl":"https://doi.org/10.1080/07420528.2025.2456563","url":null,"abstract":"<p><p>Procrastination behavior has been reportedly associated with the evening preference. This study aimed to evaluate its difference between patients with circadian rhythm sleep-wake disorders with phase delay (CRSWDswPD) and healthy controls in terms of evening preference and comorbid psychiatric disorders. Thirty patients with CRSWDswPD and 29 healthy participants were included. In both groups, the general procrastination scale (GPS), Beck Depression Inventory (BDI), and Morningness-Eveningness Questionnaire (MEQ) were administered. Additionally, Adult ADHD Self-Report Scale (ASRS) and autism spectrum quotient (AQ) were also assessed in the patient group. Unexpectedly, GPS was not statistically different between patients with CRSWDswPD and healthy controls. GPS was significantly higher with lower MEQ in the healthy group, whereas the opposite tendency was observed in the patient group. Higher AQ, ASRS, and BDI tended to be associated with higher GPS in the patient group, with the first two being statistically significant. The results suggest that general procrastination is not significantly associated with CRSWDswPD, although it is associated with evening preference in healthy participants. Procrastination in the patient group may be associated with developmental disorders or depression tendencies. Future studies should include simultaneous measurement of circadian markers, other behavioral assessments, a larger population, and untreated patients.</p>","PeriodicalId":10294,"journal":{"name":"Chronobiology International","volume":" ","pages":"1-9"},"PeriodicalIF":2.2,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143031933","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Mood variation under dual regulation of circadian clock and light.","authors":"Amalia Ridla Rahim, Veronica Will, Jihwan Myung","doi":"10.1080/07420528.2025.2455144","DOIUrl":"10.1080/07420528.2025.2455144","url":null,"abstract":"<p><p>The intricate relationship between circadian rhythms and mood is well-established. Disturbances in circadian rhythms and sleep often precede the development of mood disorders, such as major depressive disorder (MDD), bipolar disorder (BD), and seasonal affective disorder (SAD). Two primary factors, intrinsic circadian clocks and light, drive the natural fluctuations in mood throughout the day, mirroring the patterns of sleepiness and wakefulness. Nearly all organisms possess intrinsic circadian clocks that coordinate daily rhythms, with light serving as the primary environmental cue to synchronize these internal timekeepers with the 24-hour cycle. Additionally, light directly influences mood states. Disruptions to circadian rhythms, such as those caused by jet lag, shift work, or reduced daylight hours, can trigger or exacerbate mood symptoms. The complex and often subtle connections between circadian disruptions and mood dysregulation suggest that focusing solely on individual clock genes is insufficient to fully understand their etiology and progression. Instead, mood instability may arise from systemic misalignments between external cycles and the internal synchronization of circadian clocks. Here, we synthesize past research on the independent contributions of circadian clocks and light to mood regulation, drawing particularly on insights from animal studies that illuminate fundamental mechanisms relevant to human health.</p>","PeriodicalId":10294,"journal":{"name":"Chronobiology International","volume":" ","pages":"1-23"},"PeriodicalIF":2.2,"publicationDate":"2025-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143000657","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Joanna Gorgol-Waleriańczyk, Wojciech Waleriańczyk, Gordon L Flett
{"title":"Morningness-eveningness and mental health: Initial evidence of the moderating roles of mattering and anti-mattering.","authors":"Joanna Gorgol-Waleriańczyk, Wojciech Waleriańczyk, Gordon L Flett","doi":"10.1080/07420528.2025.2453236","DOIUrl":"https://doi.org/10.1080/07420528.2025.2453236","url":null,"abstract":"<p><p>Mental health problems are more prevalent in evening-oriented individuals than in their morning-oriented counterparts. Recently, research has offered first insights into how the negative effects of eveningness on mental health and well-being can be magnified or alleviated depending on accompanying psychological characteristics. In the current study, we evaluated how eveningness relates to mattering and anti-mattering and whether mattering and anti-mattering can moderate the association between eveningness and mental health. The participants were 692 Polish adults (337 women, 355 men) aged between 21 and 57 years (M ± SD: 39.76 ± 9.63). All participants completed measures of morningness-eveningness and depressive and anxiety symptoms, the General Mattering Scale (GMS) and the Anti-Mattering Scale (AMS). Conducted analyses showed that 1) the Polish versions of GMS and AMS have appropriate reliability and validity, 2) eveningness is negatively associated with mattering and positively associated with anti-mattering, depressive, and anxiety symptoms, and 3) the magnitude of the association between eveningness and mental health symptoms increased with higher anti-mattering and lower mattering. Overall, this study presents the first evidence of how feelings of being important and being valued may buffer against the negative effects of eveningness on mental health.</p>","PeriodicalId":10294,"journal":{"name":"Chronobiology International","volume":" ","pages":"1-12"},"PeriodicalIF":2.2,"publicationDate":"2025-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143000664","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ekrem Furkan Uçak, Kürşat Altınbaş, Nadir Koçak, Ahmet Güleç
{"title":"Circadian rhythm and lithium response in bipolar disorder: Insights from actigraphy and NR1D1 polymorphism.","authors":"Ekrem Furkan Uçak, Kürşat Altınbaş, Nadir Koçak, Ahmet Güleç","doi":"10.1080/07420528.2025.2455139","DOIUrl":"https://doi.org/10.1080/07420528.2025.2455139","url":null,"abstract":"<p><p>Lithium has long been used as a cornerstone mood stabilizer in the treatment of bipolar disorder (BD). However, reliable biomarkers that can predict which patients will respond better to lithium are still lacking. This study aims to evaluate the potential of NR1D1 gene SNP; rs2071427 and actigraphic measurements in predicting lithium response. Thirty-one patients diagnosed with BD at Selçuk University Faculty of Medicine and who were euthymic for at least 8 weeks were included in the study. Sleep-wake cycles and circadian rhythms of the participants were monitored by actigraph for approximately 1 week. For genetic analyses, the SNP rs2071427 variant of the NR1D1 gene was evaluated. A significant proportion of patients with homozygous (AA/GG) genotypes responded well to lithium, whereas some patients with heterozygous (AG) genotypes did not respond to lithium. Actigraphic data showed that there were marked variations in the sleep patterns of BD patients. The Morningness-Eveningness Questionnaire scale did not adequately discriminate the morning chronotype. Seasonal Pattern Assessment Questionnaire results showed that most patients had a seasonal pattern, but this was insufficient to predict response to lithium. This study once again demonstrates the need for new biomarkers to predict lithium response. The findings are an important step in the personalization of BD treatment and may improve treatment efficacy and minimize side effects by tailoring the treatment process to the individual characteristics of patients. Future studies should support these findings with larger sample groups and studies on different genetic markers.</p>","PeriodicalId":10294,"journal":{"name":"Chronobiology International","volume":" ","pages":"1-10"},"PeriodicalIF":2.2,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143000564","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Chronobiology and chronomedicine: From molecular and cellular biology to whole body interdigitating networks<b>Chronobiology and chronomedicine: From molecular and cellular biology to whole body interdigitating networks</b>, by Germaine Cornelissen and Tsuyoshi Hirota, London, UK, Royal Society of Chemistry, 2024, 690 pp., $275.00 (hardback), ISBN: 978-1-83916-200-8.","authors":"Ruifeng Cao","doi":"10.1080/07420528.2025.2453238","DOIUrl":"https://doi.org/10.1080/07420528.2025.2453238","url":null,"abstract":"","PeriodicalId":10294,"journal":{"name":"Chronobiology International","volume":" ","pages":"1-2"},"PeriodicalIF":2.2,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143000559","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ingvild Bjerknes Arnesen, Bjørn Bjorvatn, Ståle Pallesen, Siri Waage, Michael Gradisar, Ane Wilhelmsen-Langeland, Ingvild West Saxvig
{"title":"Insomnia in adolescent epidemiological studies: To what extent can the symptoms be explained by circadian factors?","authors":"Ingvild Bjerknes Arnesen, Bjørn Bjorvatn, Ståle Pallesen, Siri Waage, Michael Gradisar, Ane Wilhelmsen-Langeland, Ingvild West Saxvig","doi":"10.1080/07420528.2024.2444677","DOIUrl":"https://doi.org/10.1080/07420528.2024.2444677","url":null,"abstract":"<p><p>Epidemiological studies show a high prevalence of \"insomnia\" in adolescents. However, insomnia symptoms are not specific for insomnia disorder. Puberty is associated with circadian delay, which may cause insomnia symptoms such as problems falling asleep and daytime impairments, but also difficulties rising in the morning which is not a hallmark of insomnia disorder. The aim of this study was to investigate the extent to which adolescent insomnia symptoms may be attributed to circadian delay. The sample comprised 3,867 high-school-students. Survey instruments included the Bergen Insomnia Scale (BIS), the Munich ChronoType Questionnaire (MCTQ), the reduced Morningness-Eveningness Questionnaire (r-MEQ), and items on subjective sleep problems and sleep-related behaviors. Symptoms of circadian delay (CD) were defined as i) trouble waking on school days, ii) ability to sleep long into the day, iii) waking ≥10:00 on free days and/or iv) oversleeping for school. A total of 34.5% reported insomnia according to BIS. Among these, 88.4% reported ≥1 CD-symptom and 15.5% reported all CD-symptoms. Adolescents with insomnia and ≥1 CD-symptom were often evening-types (56.9%), had long social jetlag (2:55 h) and large school-/free day discrepancy in sleep duration (6:04 vs. 8:34 h). Results suggest circadian delay as a plausible explanation for insomnia symptoms in many adolescents.</p>","PeriodicalId":10294,"journal":{"name":"Chronobiology International","volume":" ","pages":"1-12"},"PeriodicalIF":2.2,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142982906","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Aravind Natarajan, Karla Gleichauf, Maryam Khalid, Conor Heneghan, Logan Douglas Schneider
{"title":"Circadian rhythm of heart rate and activity: A cross-sectional study.","authors":"Aravind Natarajan, Karla Gleichauf, Maryam Khalid, Conor Heneghan, Logan Douglas Schneider","doi":"10.1080/07420528.2024.2446622","DOIUrl":"https://doi.org/10.1080/07420528.2024.2446622","url":null,"abstract":"<p><p>Circadian rhythms are governed by a biological clock, and are known to occur in a variety of physiological processes. We report results on the circadian rhythm of heart rate observed using a wrist-worn wearable device (Fitbit), consisting of over 17,000 individuals over the course of 30 days. We obtain an underlying heart rate circadian rhythm from the time series heart rate by modeling the circadian rhythm as a sum over the first two Fourier harmonics. The first Fourier harmonic accounts for the approximate 24-hour rhythmicity of the body clock, while the second harmonic accounts for non-sinusoidal perturbations. From the diurnal modulation of heart rate, we obtain the following circadian parameters: (i) amplitude of modulation, (ii) bathyphase, and (iii) acrophase. We also consider the circadian rhythm of activity and show that in most individuals, the circadian rhythm of heart rate lags the circadian rhythm of activity. The widespread availability of smartwatches and trackers may enable individuals who are interested in observing their circadian rhythms of numerous physiological parameters, and to measure longitudinal changes in circadian parameters in response to various changes in health-related variables such as diet, sleep, exercise, or illness.</p>","PeriodicalId":10294,"journal":{"name":"Chronobiology International","volume":" ","pages":"1-14"},"PeriodicalIF":2.2,"publicationDate":"2025-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142977824","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Association of self-monitoring performance of cognitive performance with personal diurnal preference when sleep-deprived.","authors":"Yuki Nishimura, Michihiro Ohashi, Taisuke Eto, Sayuri Hayashi, Yuki Motomura, Shigekazu Higuchi, Masaya Takahashi","doi":"10.1080/07420528.2024.2449014","DOIUrl":"https://doi.org/10.1080/07420528.2024.2449014","url":null,"abstract":"<p><p>In modern society, many workers struggle with sleep deprivation due to their work schedules and excessive workloads. Accurate self-awareness and self-monitoring abilities are crucial for workers to adopt risk-coping strategies and protective behaviors when fatigued. The current study examined the relationship between chronotypes and self-monitoring performance during 24 h of sleep deprivation. The study involved 26 male adults in a two-night experiment, and participants' diurnal preferences were evaluated using the Morningness-Eveningness Questionnaire (MEQ). Self-monitoring performance was calculated by comparing actual task performance with self-rated predicted or post-estimated performance in the psychomotor vigilance task (PVT) and Digit Symbol Substitution Task (DSST). The study found that task and self-monitoring performances in the PVT and DSST were maintained until around 4:00 h, after which they began to deteriorate. Individuals with a higher MEQ score, indicating a stronger tendency towards a morning type, showed inaccurate self-monitoring, particularly in the final quarter of the sleep deprivation experiment, due to overly optimistic predictions. However, only prediction accuracy and not post-estimation showed this correlation. This study highlights the importance of considering an individual's chronotype in workplace management, particularly in workplaces with irregular work timings, rotating shifts, and long working hours, to ensure better occupational safety.</p>","PeriodicalId":10294,"journal":{"name":"Chronobiology International","volume":" ","pages":"1-11"},"PeriodicalIF":2.2,"publicationDate":"2025-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142977820","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Rafael Kons, Guilherme Santos, Maria Luiza Barbosa Borges, Pedro Henrique Cintra de Sousa, Daniele Detanico
{"title":"Time-of-day effects on physical performance and perceptual responses in Brazilian Jiu-Jitsu athletes.","authors":"Rafael Kons, Guilherme Santos, Maria Luiza Barbosa Borges, Pedro Henrique Cintra de Sousa, Daniele Detanico","doi":"10.1080/07420528.2025.2453235","DOIUrl":"https://doi.org/10.1080/07420528.2025.2453235","url":null,"abstract":"<p><p>This study investigated how the time of day affects physical performance and perceptual responses in Brazilian Jiu-Jitsu (BJJ) athletes. Given the significance of circadian rhythms on athletic capabilities, we aimed to determine whether performance variations occur across different times of the day (morning, 10:00-11:00h; afternoon, 14:00-15:00h; and evening, 18:00-19:00h) and if these effects differ by sex. In total, 23 BJJ athletes (9 females, 14 males) participated in this study. The athletes performed physical tests including the maximal isometric handgrip strength test (HGS), Kimono Grip Strength Endurance Test (KGST), and a BJJ-specific test (BJJST) in the morning, afternoon, and evening. Perceptual responses (RPE) were also collected before the BJJST. Results showed enhanced physical performance in the evening for most tests, including increased HGS and superior performance in the KGST and BJJST for both sexes (<i>p</i> < 0.05). No significant differences were observed in perceptual responses (RPE) or between sexes (<i>p</i> > 0.05). We conclude that BJJ athletes generally perform better in the evening compared to other times of the day, with notable improvements in HSG and specific BJJ tests. The study highlights the importance of aligning training schedules with an athlete's circadian rhythm to optimize performance, leading to more efficient training sessions and improved long-term performance outcomes.</p>","PeriodicalId":10294,"journal":{"name":"Chronobiology International","volume":" ","pages":"1-8"},"PeriodicalIF":2.2,"publicationDate":"2025-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142969829","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}