Chronobiology International最新文献

{"title":"Dimensions of circadian functioning and depressive symptoms: The moderating and mediating role of general self-efficacy.","authors":"Maria Warowny, Joanna Gorgol-Waleriańczyk, Maciej Stolarski","doi":"10.1080/07420528.2026.2685033","DOIUrl":"10.1080/07420528.2026.2685033","url":null,"abstract":"<p><p>The associations between circadian preferences and various aspects of mental health are widely reported in chronopsychological literature. The present study investigated the role of general self-efficacy in the associations between three dimensions of circadian functioning - Morning Affect (MA), Eveningness (EV), Distinctness (circadian amplitude; DI) - and depressive symptoms. A non-clinical sample of 2,869 participants (50.4% women; aged 20-60, <i>M</i> = 40.72, <i>SD</i> = 10.64) completed a multidimensional measure of circadian functioning (MESSi) and questionnaires assessing general self-efficacy (GSES) and depressive symptoms (PHQ-9). General self-efficacy was negatively predicted by DI and positively predicted by both MA and EV. Moderation analyses showed that general self-efficacy functioned as a buffer, weakening the relationship between low MA and depressive symptoms, as well as between high DI and depressive symptoms. Mediation analyses indicated that general self-efficacy partly explained the associations between each of the three circadian functioning dimensions and depressive symptoms. Three main conclusions emerge: (1) self-efficacy may buffer (moderate) the relationships between less adaptive circadian functioning and depressive symptoms, (2) self-efficacy may also partly explain (mediate) these associations, (3) employing multidimensional measures of circadian functioning is essential for gaining a deeper understanding of its associations with both self-efficacy and depressive symptoms.</p>","PeriodicalId":10294,"journal":{"name":"Chronobiology International","volume":" ","pages":"1676-1692"},"PeriodicalIF":2.5,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148276496","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":"Effects of Ramadan intermittent fasting on sleep, cognitive and physical performance in elite karate athletes: A within-subject repeated-measures study.","authors":"Shaben Mhara, Ahmed Amri, Salah Eddine Raddaoui, Said Ben Hassen, Mohamed Abdelkader Souissi, Nizar Souissi","doi":"10.1080/07420528.2026.2685036","DOIUrl":"10.1080/07420528.2026.2685036","url":null,"abstract":"<p><p>Ramadan intermittent fasting alters sleep-wake patterns, dietary intake, and daily routines, which may interact with circadian timing and fatigue to influence athletic performance. This study examined the effects of Ramadan fasting on sleep, dietary intake, cognitive performance, and anaerobic running performance across different times of day and fatigue states in elite karate athletes. Twelve elite male karate athletes completed a within-subject repeated-measures protocol before Ramadan, during the second week, and during the fourth week of Ramadan. Testing was conducted at 08:00, 17:00, and 22:00. Simple reaction time, multiple-choice reaction time, Stroop performance, and 5-m multiple shuttle run performance were assessed before and after a karate-specific aerobic fatigue protocol. Sleep and dietary intake were monitored throughout each period. Ramadan fasting significantly reduced total sleep time, sleep efficiency, total energy intake, carbohydrate intake, and fat intake, while increasing subjective sleepiness and fatigue. Cognitive and physical performance were significantly affected by Ramadan period, time of day, and fatigue state. The greatest deterioration occurred during the fourth week of Ramadan, particularly at 17:00, when both reaction-time performance and shuttle-run outcomes showed the largest impairments compared with pre-Ramadan values. Performance decrements were also observed at 22:00, whereas morning performance at 08:00 was relatively preserved. Exercise-induced fatigue further worsened cognitive and physical outcomes and attenuated normal time-of-day variation. These findings indicate that Ramadan intermittent fasting induces sleep disruption, dietary alterations, and time-of-day dependent impairments in elite karate athletes. The late afternoon, particularly 17:00 during the fourth week of Ramadan, appears to be the most vulnerable period for cognitive and physical performance deterioration, especially under fatigue. Training load, recovery strategies, sleep management, and nutritional timing should therefore be carefully adapted during Ramadan.</p>","PeriodicalId":10294,"journal":{"name":"Chronobiology International","volume":" ","pages":"1693-1709"},"PeriodicalIF":2.5,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148257537","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":"Melanopsin mediates thermal activation of molecular clock genes in murine preadipocytes.","authors":"Giovanna Zanetti, Leonardo Vinícius Monteiro de Assis, Maria Nathália Moraes, Ana Maria de Lauro Castrucci","doi":"10.1080/07420528.2026.2679133","DOIUrl":"10.1080/07420528.2026.2679133","url":null,"abstract":"<p><p>In mammals, melanopsin (OPN4) is a retinal photopigment found on a subset of intrinsically photosensitive ganglion cells, which synchronize the central circadian clock with the light-dark cycle. Peripheral tissues have also been found to express melanopsin, but its function remains to be explored. In this study, we investigated whether cold temperature pulses (34°C) could modulate clock gene expression in murine 3T3-L1 preadipocytes and the role of melanopsin in regulating this response. We detected the presence of the cone opsin (OPN1SW), rhodopsin (OPN2), and melanopsin (OPN4) using immunocytochemistry. We demonstrated the role of OPN4 in the upregulation of the clock gene <i>Per1</i> in 3T3-L1 cells in response to cold-temperature pulses (34°C), through a pharmacological assay employing a well-established OPN4 antagonist. Then, we determined the profile of the clock gene <i>Per1</i>, using luciferase as the bioluminescence reporter. <i>Per1::Luc</i> 3T3-L1 cells subjected to constant temperature (37°C) or repeated cold-temperature pulses (34°C) exhibited an oscillatory bioluminescence profile. The cold-temperature pulses induced an increase in the amplitude of <i>Per1</i> bioluminescence and a phase delay in comparison to control cells. These findings suggest that temperature detection through melanopsin could be an important pathway for peripheral clock modulation, with direct implications for metabolism control.</p>","PeriodicalId":10294,"journal":{"name":"Chronobiology International","volume":" ","pages":"1579-1589"},"PeriodicalIF":2.5,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148053081","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":"Cultural and health perspectives of circadian rhythms and human sleep.","authors":"Habiba Haroon, Durga Rao Pedada","doi":"10.1080/07420528.2026.2682482","DOIUrl":"10.1080/07420528.2026.2682482","url":null,"abstract":"<p><p>Circadian rhythms (CRs) are regulated by the body's internal biological clock and influence various physiological processes such as sleep-wake cycles, hormone secretion, cardiovascular activity, core body temperature, and metabolism. Disruption to these rhythms due to irregular sleep schedules, shift work, artificial light exposure, and modern lifestyle changes are associated with adverse health outcomes. This review examines how human biological clocks have been shaped by evolutionary adaptations to natural light-dark cycles, developmental shifts in chronotype across the lifespan, and cultural factors that structure sleep behaviour across societies. It draws on evidence of segmented sleep patterns in early human societies and age-related shifts from delayed sleep in adolescence to earlier sleep-wake patterns in older adulthood. It further explores how urbanization, changes in work and social schedules, and the expansion of digital technologies and artificial light contribute to circadian misalignment. Databases such as Google Scholar, Scopus, PubMed, and Web of Science were searched systematically in accordance with PRISMA guidelines. Following a screening process, 26 studies met the eligibility criteria and were included in the final synthesis. The selected literature was examined from an anthropological perspective to understand the cross-cultural variation in sleep patterns and to explore how social organization and technological environments shape temporal behaviour. The thematic synthesis highlights how human sleep patterns have evolved, how chronotypes shift with age, how sociocultural practices shape sleep diversity across groups, and how modern lifestyles contribute to circadian misalignment. Drawing on global context and emerging evidence from India, this review identifies areas for future research and emphasizes the need to integrate biological and socio-cultural perspectives to promote overall health and well-being.</p>","PeriodicalId":10294,"journal":{"name":"Chronobiology International","volume":" ","pages":"1493-1507"},"PeriodicalIF":2.5,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148142763","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":"Mark the larks and owls with souls - Differentiating between four circardian preferences in the Biopsychological Owls and Larks Typology (BOLT) - A new psychological conceptualization of chronotype.","authors":"Joanna Gorgol-Waleriańczyk, Radosław Rogoza, Włodzimierz Strus","doi":"10.1080/07420528.2026.2678283","DOIUrl":"10.1080/07420528.2026.2678283","url":null,"abstract":"<p><p>Existing chronotype models focus on circadian phase preferences, providing limited insight into how these preferences translate into everyday psychological functioning. Especially, they overlook individual differences in daily energy levels and the effectiveness of their regulation, which may explain why people with similar biological rhythms differ in adaptability and well-being. The present study aimed to develop and empirically validate a theoretically grounded psychological framework of chronotype - the Biopsychological Owls and Larks Typology (BOLT) - which conceptualizes chronotype as a system of energy regulation defined by two dimensions: overall energy level and regulatory effectiveness. The study included 1426 Polish adults aged 20-60 years who completed the Biopsychological Owls and Larks Typology Scale (BOLTS), the Morningness-Eveningness Stability Scale improved, and standardized measures of depression, anxiety, life satisfaction, and temperament traits. Factor analyses supported a four-profile structure comprising hardy larks, vulnerable larks, overactive owls, and neurotic owls. Measurement invariance across two independent samples was confirmed. The identified profiles showed distinct and theoretically meaningful patterns of associations with affective and temperamental variables, ranging from highly adaptive to maladaptive functioning. These findings support the BOLT model and suggest that chronotype is best understood as a biopsychological system of energy regulation rather than solely as a timing preference.</p>","PeriodicalId":10294,"journal":{"name":"Chronobiology International","volume":" ","pages":"1560-1578"},"PeriodicalIF":2.5,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148142752","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":"The influence of light on suicidality: A narrative review.","authors":"Alessandro Sarzetto, Franco Garonna","doi":"10.1080/07420528.2026.2678278","DOIUrl":"10.1080/07420528.2026.2678278","url":null,"abstract":"<p><p>Suicide is a complex and deeply troubling phenomenon that occurs across all cultures and societies, representing a significant international public health challenge. Recent research has revealed a wide spectrum of ways light influences our brain circuits, with effects ranging from sleep-wake rhythm to mood regulation. Furthermore, a growing body of evidence highlights that light exposure is vital for both our physical and psychological well-being. In this paper, we hypothesize that light has an influence on suicidality. We examine evidence from several key areas: (1) currently available light-based treatments and suicide prevention measures; (2) the relationship between suicide rates and seasons; (3) the relationship between suicide rates and the time of day; and (4) the relationship between suicide rates and sunlight exposure. Based on the findings from studies exploring these topics, we propose a neurochemical model involving serotonin as a possible mediator of the relationship between light and suicide. A deeper understanding of the link between light and suicide could lead to a better identification of individuals at risk and potentially to the development of new, light-related suicide prevention measures.</p>","PeriodicalId":10294,"journal":{"name":"Chronobiology International","volume":" ","pages":"1475-1483"},"PeriodicalIF":2.5,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148004932","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":"Polyester wool-based environmental RNA collection enables detection of diel <i>per2</i> expression in the Malabar grouper (<i>Epinephelus malabaricus</i>).","authors":"Kodai Fukunaga, Yafan Zhu, Siqi Lu, Mayuko Nakazato, Yuka Hasegawa, Akihiro Takemura","doi":"10.1080/07420528.2026.2739517","DOIUrl":"https://doi.org/10.1080/07420528.2026.2739517","url":null,"abstract":"<p><p>Environmental RNA (eRNA) analysis has attracted increasing attention as a non-invasive approach for monitoring aquatic organisms because it can provide information on actively expressed genes. However, many existing eRNA sampling methods rely on filtration-based procedures that require specialized materials and substantial sample processing, limiting their practical application in aquaculture settings. In this study, we developed a simple polyester wool-based method for collecting eRNA directly from fish rearing tanks. Using the Malabar grouper (<i>Epinephelus malabaricus</i>) as a model species, we conducted three experiments to evaluate the detectability, persistence, and temporal expression patterns of eRNA collected using this approach. eRNA obtained from rearing water contained detectable transcripts of housekeeping genes and the circadian clock gene <i>per2</i>. In a closed recirculating system, the target transcript remained detectable for up to 8 h after fish removal. Furthermore, diel expression patterns of <i>per2</i> detected in rearing-water eRNA were broadly similar to those observed in muscle, pituitary, and liver tissues. Heatmap visualization, cross-correlation analysis, and cosinor analysis suggested temporal similarity between aqueous eRNA signals and tissue expression profiles. These findings demonstrate the feasibility of detecting diel clock gene expression using polyester wool-based eRNA collection. The proposed approach provides a simple and non-invasive method for eRNA sampling in aquaculture systems, although further validation across additional genes, species, and culture conditions is required.</p>","PeriodicalId":10294,"journal":{"name":"Chronobiology International","volume":" ","pages":"1-8"},"PeriodicalIF":2.5,"publicationDate":"2026-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149069071","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":"Social jetlag and genetic susceptibility to obesity: Implications for prevention.","authors":"Darin Jan Tindowen, Maritess Viernes, Royete Guillermo","doi":"10.1080/07420528.2026.2740776","DOIUrl":"https://doi.org/10.1080/07420528.2026.2740776","url":null,"abstract":"","PeriodicalId":10294,"journal":{"name":"Chronobiology International","volume":" ","pages":"1-2"},"PeriodicalIF":2.5,"publicationDate":"2026-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149069161","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":"Beyond time outdoors: Rethinking what self-reported daylight exposure measures.","authors":"Ariel M Lorenzo, Jerome G Mamuri, Carl Agustin N Arcilla, Donn Jaime G Morales, Bryle Rhyz N Immangdul, Mary Anne P Palasigue, Joy R Sayangda, Wilford H Miguel, Edward A Ochoco","doi":"10.1080/07420528.2026.2740158","DOIUrl":"https://doi.org/10.1080/07420528.2026.2740158","url":null,"abstract":"","PeriodicalId":10294,"journal":{"name":"Chronobiology International","volume":" ","pages":"1-2"},"PeriodicalIF":2.5,"publicationDate":"2026-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149069093","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 between type D personality traits and circadian blood pressure patterns: Focus on dipper vs non-dipper phenotypes.","authors":"Selim Süleyman Sert, Fatih Aksoy","doi":"10.1080/07420528.2026.2723198","DOIUrl":"https://doi.org/10.1080/07420528.2026.2723198","url":null,"abstract":"<p><p>The non-dipper blood pressure pattern, characterized by an impaired nocturnal decline in blood pressure, is associated with an increased risk of cardiovascular and cognitive complications. Type D personality, defined by the components of negative affectivity and social inhibition, represents a psychological pattern linked to heightened stress response. This study aimed to investigate the association between Type D personality traits and the non-dipper blood pressure pattern. Between January and December 2023, a total of 182 patients evaluated for hypertension were screened, and 99 individuals who met the inclusion criteria and had valid 24-hour ambulatory blood pressure monitoring (ABPM) results were enrolled. Participants were classified as dipper (<i>n</i> = 49) or non-dipper (<i>n</i> = 50) based on the percentage decline in nocturnal blood pressure. Type D personality was assessed using the DS14 scale developed by Denollet. Blood pressure parameters were obtained using the Del Mar Reynolds Medical Tracker NIBP2 device. Group comparisons were performed with appropriate parametric or non-parametric tests. Logistic regression analysis was used to identify predictors of the non-dipper pattern, and receiver operating characteristic (ROC) analysis was conducted to evaluate the discriminative value of Type D personality components. Nighttime systolic and diastolic blood pressure values were significantly higher in the non-dipper group, accompanied by a markedly reduced physiological nocturnal dipping. Social inhibition (SI) and negative affectivity (NA) scores were significantly elevated in non-dippers compared with dippers (SI: 14.62 ± 3.36 vs. 7.10 ± 1.98; NA: 12.08 ± 2.12 vs. 5.96 ± 2.41; both <i>p</i> < 0.001). Correlation analyses demonstrated positive associations of SI and NA scores with nighttime systolic/diastolic blood pressure, and negative associations with systolic and diastolic dipping percentages. ROC analysis revealed high diagnostic accuracy for both SI (AUC: 0.986) and NA (AUC: 0.968), with sensitivity of 93-96% and specificity of 96-98%. Metabolic parameters showed higher fasting glucose levels and lower estimated glomerular filtration rate(eGFR) values in the non-dipper group (<i>p</i> < 0.05). Logistic regression identified SI and NA as independent predictors of the non-dipper blood pressure pattern. This study demonstrates a significant association between Type D personality traits and the non-dipper blood pressure pattern. However, given the cross-sectional design and potential confounding, these findings should be interpreted cautiously. Further large-scale and prospective studies are required before these findings can be translated into clinical practice.</p>","PeriodicalId":10294,"journal":{"name":"Chronobiology International","volume":" ","pages":"1-8"},"PeriodicalIF":2.5,"publicationDate":"2026-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149058645","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}