Chronobiology International最新文献_第10页

Investigating the prevalence of probable night eating syndrome among preclinical medical students and the mediating role of impulsivity in its relationship with chronotype. 探讨临床前医学生可能夜食综合征的患病率及冲动性在其与时型关系中的中介作用。

IF 2.2 4区医学

Chronobiology International Pub Date : 2025-02-01 Epub Date: 2025-02-11 DOI: 10.1080/07420528.2025.2460648

Mehtap Yucel, Ebru Kubra Uzdil, Büşra Batur, Nagehan Ozkan Yaman, Ziya Oksuz, Beyza Kose Kaya, Emine Nur Sen, Sakir Gica

{"title":"Investigating the prevalence of probable night eating syndrome among preclinical medical students and the mediating role of impulsivity in its relationship with chronotype.","authors":"Mehtap Yucel, Ebru Kubra Uzdil, Büşra Batur, Nagehan Ozkan Yaman, Ziya Oksuz, Beyza Kose Kaya, Emine Nur Sen, Sakir Gica","doi":"10.1080/07420528.2025.2460648","DOIUrl":"10.1080/07420528.2025.2460648","url":null,"abstract":"The aim of the current study was to determine the prevalence of night eating syndrome (NES) among preclinical medical students. All participants were asked to complete a socio-demographic form, Night Eating Questionnaire (NEQ), Morningness-Eveningness Questionnaire (MEQ), Pittsburgh Sleep Quality Index (PSQI), Barratt Impulsiveness Scale-11 (BIS-11), Patient Health Questionnaire Somatic, Anxiety, and Depressive Symptom Scales (PHQ-SADS), and the Adult Attention Deficit Hyperactivity Disorder Self-report Scale (ASRS). The participants were categorised according to their NEQ scores, and statistical analyses were carried out between the groups. The mean NEQ score of the participants was 16.31 ± 5.48, and 8.8% were diagnosed with probable NES. Those with probable NES had higher MEQ, PSQI, BIS-11, PHQ-15, GAD-7, PHQ-9, ASRS-A and ASRS-B scores. A moderate positive association was identified between the NEQ score and PSQI and PHQ-9. ASRS-B and BIS-11 were found to have a mediating role in the relationship between NES and MEQ. The findings of our study suggest that the prevalence of probable NES in preclinical medical students is higher than the general population, and that NES symptomatology is associated with many psychiatric clinical entities in addition to depressive and sleep disorders included in the diagnostic criteria.","PeriodicalId":10294,"journal":{"name":"Chronobiology International","volume":" ","pages":"270-281"},"PeriodicalIF":2.2,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143389952","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}

引用次数: 0

Evidence of a circadian variation in 10-km laboratory running time-trial performance, where a standardised approach has been employed. 采用标准化方法的10公里实验室计时赛表现存在昼夜节律变化的证据。

IF 2.2 4区医学

Chronobiology International Pub Date : 2025-02-01 Epub Date: 2025-02-05 DOI: 10.1080/07420528.2025.2459668

Ben J Edwards, Brenda B Boyle, Jatin G Burniston, Dominic A Doran, Dave Doran, Magali Giacomoni, Elizabeth Mahon, Samuel A Pullinger

{"title":"Evidence of a circadian variation in 10-km laboratory running time-trial performance, where a standardised approach has been employed.","authors":"Ben J Edwards, Brenda B Boyle, Jatin G Burniston, Dominic A Doran, Dave Doran, Magali Giacomoni, Elizabeth Mahon, Samuel A Pullinger","doi":"10.1080/07420528.2025.2459668","DOIUrl":"10.1080/07420528.2025.2459668","url":null,"abstract":"Diurnal variations in time-trial performance have been shown in people living normally, where a \"standardised protocol\" has been employed to reduce bias. We tested the hypothesis that a circadian variation exists for a 10-km running laboratory-based time-trial, where such a standardised approach is used. Twelve recreationally active adult males were recruited. The participants completed three familiarisation time-trials to the best of their ability at a self-selected pace and six 10-km time-trials at 06:00, 10:00, 14:00, 18:00, 22:00 and 02:00 h. Each session was separated by 7-days. Participants were allocated into 6 groups due to finish times (FT); sessions were counterbalanced in order of administration. A cosine fit for resting intra-aural temperature and FT both showed a significant circadian rhythm (p < 0.05) with mesor, amplitude and acrophases of 36.61°C vs 2994 s, 0.34°C vs 149 s; and 17:29 vs 18:44 h:min, respectively. The parallelism of temperature and FT agrees with previously published research. The finding of a 24-h rhythm in 10-km FT (5.0%, d = 0.80; power = 100%) concurs with that of a shorter distance where \"standardised protocols\" have been employed (4-km, 2.6%, d = 0.34). This finding has implications for scheduling of competition and training. Whether this variation is apparent in other populations, however, is unclear.","PeriodicalId":10294,"journal":{"name":"Chronobiology International","volume":" ","pages":"244-258"},"PeriodicalIF":2.2,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143255034","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}

引用次数: 0

The association between the circadian misalignment of serum cortisol acrophase and sleep end time with chemotherapy-induced peripheral neuropathy. 血清皮质醇顶相和睡眠结束时间的昼夜节律失调与化疗诱导的周围神经病变之间的关系。

IF 2.2 4区医学

Chronobiology International Pub Date : 2025-02-01 Epub Date: 2025-02-03 DOI: 10.1080/07420528.2025.2460643

Joon Sung Shin, Sanghyup Jung, Geun Hui Won, Sun Hyung Lee, Jaehyun Kim, Saim Jung, Chan-Woo Yeom, Kwang-Min Lee, Kyung-Lak Son, Jang-Il Kim, Sook Young Jeon, Han-Byoel Lee, David Spiegel, Bong-Jin Hahm

{"title":"The association between the circadian misalignment of serum cortisol acrophase and sleep end time with chemotherapy-induced peripheral neuropathy.","authors":"Joon Sung Shin, Sanghyup Jung, Geun Hui Won, Sun Hyung Lee, Jaehyun Kim, Saim Jung, Chan-Woo Yeom, Kwang-Min Lee, Kyung-Lak Son, Jang-Il Kim, Sook Young Jeon, Han-Byoel Lee, David Spiegel, Bong-Jin Hahm","doi":"10.1080/07420528.2025.2460643","DOIUrl":"10.1080/07420528.2025.2460643","url":null,"abstract":"Chemotherapy-induced peripheral neuropathy (CIPN) is a common adverse effect of chemotherapy. The objective of this prospective observational study was to examine the association between circadian misalignment (CM), as measured by phase angle difference (PAD) of biological and behavioral rhythms and CIPN. The PAD of cortisol acrophase and actigraphy-based sleep end time in breast cancer patients was measured and categorized into low PAD (n = 11) and high PAD (n = 12) groups based on median value. CIPN was assessed using the European Organization for Research and Treatment of Cancer Quality of Life Questionnaire-CIPN20 (CIPN20). The assessment of CM revealed that the sleep end time of the low PAD group was more delayed in relation to cortisol acrophase compared to the high PAD group. The low PAD group demonstrated significantly higher CIPN20 global and sensory scale scores compared to the high-PAD group at one month post-chemotherapy, with an estimated group difference of 17.63 ± 4.75 and 27.07 ± 6.70 (p = 0.001 and p < 0.001, respectively). The present findings indicate that the low PAD group, which exhibited a relatively delayed behavioral rhythm with respect to its biological rhythm, displayed an increased susceptibility to CIPN. Further large-sample research is necessary to attain a comprehensive understanding of the mechanisms through which CM affects CIPN.","PeriodicalId":10294,"journal":{"name":"Chronobiology International","volume":" ","pages":"259-269"},"PeriodicalIF":2.2,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143122547","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}

引用次数: 0

Chronobiology and chronomedicine: From molecular and cellular biology to whole body interdigitating networksChronobiology and chronomedicine: From molecular and cellular biology to whole body interdigitating networks, by Germaine Cornelissen and Tsuyoshi Hirota, London, UK, Royal Society of Chemistry, 2024, 690 pp., $275.00 (hardback), ISBN: 978-1-83916-200-8. 时间生物学和时间医学：从分子和细胞生物学到全身交叉网络时间生物学和时间医学：从分子和细胞生物学到全身交叉网络，Germaine Cornelissen和Tsuyoshi Hirota，伦敦，英国，皇家化学学会，2024,690页，275.00美元（精装本），ISBN: 978-1-83916-200-8。

IF 2.2 4区医学

Chronobiology International Pub Date : 2025-01-20 DOI: 10.1080/07420528.2025.2453238

Ruifeng Cao

引用次数: 0

Evaluation of the relationship of chronotype, MIND diet, and lifestyle factors in overweight and obese people: Path analysis and structural equation modeling. 超重和肥胖人群中时间类型、MIND饮食和生活方式因素的关系评价：通径分析和结构方程模型

IF 2.2 4区医学

Chronobiology International Pub Date : 2025-01-01 Epub Date: 2025-01-02 DOI: 10.1080/07420528.2024.2445732

Ayfer Beyaz Coşkun, Feray Çağiran Yilmaz, Murat Açik

{"title":"Evaluation of the relationship of chronotype, MIND diet, and lifestyle factors in overweight and obese people: Path analysis and structural equation modeling.","authors":"Ayfer Beyaz Coşkun, Feray Çağiran Yilmaz, Murat Açik","doi":"10.1080/07420528.2024.2445732","DOIUrl":"10.1080/07420528.2024.2445732","url":null,"abstract":"The effects of chronotype and diet on obese individuals have been reported in previous studies. This study aimed to examine the relationship between the Mediterranean-DASH intervention for neurodegenerative delay (MIND) diet, chronotype and lifestyle factors in different types of overweight and obese people. 1100 obese individuals participated in this cross-sectional study. Compliance with the MIND diet was questioned, anthropometric measurements were taken, and biochemical parameter results from patient records in the last week were examined. Chronotypes were determined with the \"A self-assessment questionnaire to determine morningness in human circadian rhythms\" scale. MIND diet score was inversely associated with the body mass index (BMI) [β (SE) = -0.239 (0.11), p = 0.31] and waist circumference [β (SE) = -0.026 (0.01), p = 0.028], explained 0.4% of BMI and 0.6% of WC. There was a significant relationship between poorer MIND diets and higher CRP levels. A positive correlation was found between an increased MEQ score and MIND diet only in overweight participants (correlation coefficient = 0.200, p < 0.05). Whole cereals and fish consumption were positively associated with chronotype scores, while the highest odds of red meats and fast/fried foods seemed to have a negative effect. As a result, it has been observed that individuals with a morning chronotype have higher compliance with the MIND diet and make healthier food choices. Both having a morning chronotype and complying with the MIND diet have been associated with improvements in biochemical parameters in overweight and obese people.","PeriodicalId":10294,"journal":{"name":"Chronobiology International","volume":" ","pages":"98-107"},"PeriodicalIF":2.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142913866","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}

引用次数: 0

Shiftwork and leisure-time physical inactivity (LTPI) among U.S. workers. 美国工人的轮班工作和闲暇时间缺乏运动（LTPI）。

IF 2.2 4区医学

Chronobiology International Pub Date : 2025-01-01 Epub Date: 2024-12-17 DOI: 10.1080/07420528.2024.2437427

Desta Fekedulegn, D Leann Long, Samantha Service, Ja K Gu, Kim E Innes

{"title":"Shiftwork and leisure-time physical inactivity (LTPI) among U.S. workers.","authors":"Desta Fekedulegn, D Leann Long, Samantha Service, Ja K Gu, Kim E Innes","doi":"10.1080/07420528.2024.2437427","DOIUrl":"10.1080/07420528.2024.2437427","url":null,"abstract":"Physical inactivity may exacerbate the adverse health effects associated with shift work. We investigated the association of shift work with leisure-time physical inactivity (LTPI). A cross-sectional analysis included 33 983 adults from National Health Interview Survey who self-reported their work schedule and leisure-time physical activity. Participants were classified in to two groups as either (a) inactive or (b) insufficiently/sufficiently. Prevalence ratios were derived using SUDAAN. Analyses were stratified by sex. In this sample of U.S. workers, 27% were shift workers, 26% were physically inactive, and 47% did not meet recommended levels of leisure-time physical activity. Inactivity level was 23% higher in women than in men among shift workers but did not differ by sex among daytime workers (PR = 1.02, 95% CI: 0.96-1.07). Evening or night work was associated with higher LTPI among women but not men. LTPI was 17% higher in women working the night shift, and 24% higher in those on the evening shift compared to those working the daytime shift. These findings suggest that shift work may contribute to increased LTPI, with effects that may be particularly pronounced in women. Interventions addressing LTPI among shift workers may help mitigate the adverse health effects that have been linked to shift work in prior studies.","PeriodicalId":10294,"journal":{"name":"Chronobiology International","volume":" ","pages":"1-13"},"PeriodicalIF":2.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11835517/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142846119","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Examining sex differences in morningness-eveningness and inter-individual variability across years of age: A cross-sectional study. 研究早睡晚睡的性别差异和跨年龄的个体差异：一项横断面研究。

IF 2.2 4区医学

Chronobiology International Pub Date : 2025-01-01 Epub Date: 2024-12-20 DOI: 10.1080/07420528.2024.2444667

Imke Buekenhout, Maria Inês Clara, Ana Allen Gomes, José Leitão

{"title":"Examining sex differences in morningness-eveningness and inter-individual variability across years of age: A cross-sectional study.","authors":"Imke Buekenhout, Maria Inês Clara, Ana Allen Gomes, José Leitão","doi":"10.1080/07420528.2024.2444667","DOIUrl":"10.1080/07420528.2024.2444667","url":null,"abstract":"This study investigated the impact of age on morningness-eveningness (ME) and its inter-individual variability, with a focus on sex-specific patterns. A sample of 2890 participants aged 12-94 years (55.85% female) completed the Composite Scale of Morningness. Multiple linear regression analyses revealed a significant Age × Sex interaction, indicating distinct age-dependent patterns for males and females in both ME and its inter-individual variability. We conducted segmented regression analyses to explore these dynamics further and identify breakpoints. Eveningness increased across adolescence, with both males and females reaching peak lateness at 20 years. Morningness increased thereafter until 64.94 years for females and until 59 years for males. Following these sex-specific breakpoints, morningness remained constant for females and increased at a reduced rate for males. After the age of 48, males exhibited greater morningness than females. Inter-individual variability in ME (VME) changed with age, increasing until 33 years for men and 36.80 years for women, followed by a decrease for both sexes. From 50.30 years onward, females showed greater VME compared to men. This study suggests that ME and VME shift across age, and differences between sexes were observed from middle age onwards. Diurnal preferences are likely influenced by internal and environmental variables.","PeriodicalId":10294,"journal":{"name":"Chronobiology International","volume":" ","pages":"29-45"},"PeriodicalIF":2.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142871641","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}

引用次数: 0

Effects of one-night of partial sleep loss on the circadian rhythm of temperature, subjective tiredness, alertness, and standing broad jump performance; is there a sex difference? 一晚部分睡眠缺失对体温昼夜节律、主观疲劳、警觉性和立定跳远成绩的影响性别有差异吗？

IF 2.2 4区医学

Chronobiology International Pub Date : 2025-01-01 Epub Date: 2025-01-08 DOI: 10.1080/07420528.2024.2445722

Ben J Edwards

{"title":"Effects of one-night of partial sleep loss on the circadian rhythm of temperature, subjective tiredness, alertness, and standing broad jump performance; is there a sex difference?","authors":"Ben J Edwards","doi":"10.1080/07420528.2024.2445722","DOIUrl":"10.1080/07420528.2024.2445722","url":null,"abstract":"Maximal gross-muscular performance shows a daily variation in adult males, however, effects of sleep loss on circadian rhythms of gross-muscular tasks with a high skill element such as the standing broad jump is less well established, and differences between biological sex may exist. Thirty-one males and 24 females volunteered. Participants were familiarised with tests before completing two conditions i) Normal (N) retires at 23:30, rising at 07:30 h the night before testing, and ii) Sleep deprivation (SD) retiring at 03:00, rising at 07:30 h, administered in a randomised counterbalanced-fashion. Participants having had 8- or 4.5-h opportunity to sleep, entered the laboratory at 08:00 h and sublingual temperatures, tiredness, and alertness were measured. Thereafter, volunteers completed a warm-up (3 jumps at 40, 60, and 80% max-effort) and then performed jumps. This schedule was replicated at 12:00, 16:00, 20:00, 24:00, and 04:00 h on the same day. Participants were more tired and less alert in the partial sleep deprivation condition, and time-of-day effects were evident in all variables with peaks in jump length coinciding with temperature and alertness (Ф15:44-18:24 h). Females, however, showed a preference for an ~1 h earlier peak in tiredness (mediated in the SD rather than N), with a lower mesor and/or amplitudes in alertness and jump performance than males. The results of the current investigation have important implications for athletes, particularly females suffering sleep loss, regarding strategies to cope with early peaks in tiredness and physical training demands.","PeriodicalId":10294,"journal":{"name":"Chronobiology International","volume":" ","pages":"85-97"},"PeriodicalIF":2.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142945720","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}

引用次数: 0

Insomnia in adolescent epidemiological studies: To what extent can the symptoms be explained by circadian factors? 青少年失眠症流行病学研究：在多大程度上可以用昼夜因素来解释这些症状？

IF 2.2 4区医学

Chronobiology International Pub Date : 2025-01-01 Epub Date: 2025-01-15 DOI: 10.1080/07420528.2024.2444677

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":"10.1080/07420528.2024.2444677","url":null,"abstract":"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.","PeriodicalId":10294,"journal":{"name":"Chronobiology International","volume":" ","pages":"58-69"},"PeriodicalIF":2.2,"publicationDate":"2025-01-01","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}

引用次数: 0

Time-of-day effects on physical performance and perceptual responses in Brazilian Jiu-Jitsu athletes. 时间对巴西柔术运动员身体表现和知觉反应的影响。

IF 2.2 4区医学

Chronobiology International Pub Date : 2025-01-01 Epub Date: 2025-01-11 DOI: 10.1080/07420528.2025.2453235

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":"10.1080/07420528.2025.2453235","url":null,"abstract":"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 (p < 0.05). No significant differences were observed in perceptual responses (RPE) or between sexes (p > 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.","PeriodicalId":10294,"journal":{"name":"Chronobiology International","volume":" ","pages":"147-154"},"PeriodicalIF":2.2,"publicationDate":"2025-01-01","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}

引用次数: 0