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Coluk Y, Peker EGG, Yildirmak S, Keskin A, Yildirim G. Exploring the protective role of green tea extract against cardiovascular alterations induced by chronic REM sleep deprivation via modulation of inflammation and oxidative stress. BMC Complement Med Ther 2024; 24:351. [PMID: 39363261 PMCID: PMC11448275 DOI: 10.1186/s12906-024-04643-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2024] [Accepted: 09/12/2024] [Indexed: 10/05/2024] Open
Abstract
BACKGROUND Chronic Rapid eye movement (REM) sleep deprivation has been associated with various cardiovascular alterations, including disruptions in antioxidant defense mechanisms, lipid metabolism, and inflammatory responses. This study investigates the therapeutic potential of green tea extract (GTE) in mitigating these adverse effects. METHODS A total of 24 male Wistar albino rats were used in this study and divided into the control group (n = 8), Chronic-REM Sleep Deprivation (CRSD) Group (n = 8) and Chronic-REM SD + Green Tea 200 (CRSD + GTE200) Group (n = 8). After 21 days, a comprehensive analysis of paraoxonase (PON1), arylesterase (ARE), malondialdehyde (MDA), glutathione (GSH), nitric oxide (NOx), proinflammatory cytokines, and lipid profiles in aortic tissue, heart tissue, and serum was conducted in a sleep-deprived rat model. RESULTS Chronic REM sleep deprivation led to a significant reduction in PON1 and ARE levels in aortic (p = 0.046, p = 0.035 respectively) and heart tissues (p = 0.020, p = 0.019 respectively), indicative of compromised antioxidant defenses. MDA levels increased, and NOx levels decreased, suggesting oxidative stress and impaired vascular function. Lipid profile alterations, including increased triglycerides and total cholesterol, were observed in serum. Elevated levels of inflammatory cytokines (IL-6 and TNF-alpha) further indicated an inflammatory response (p = 0.007, p = 0.018 respectively). GTE administration demonstrated a protective role, restoring antioxidant enzyme levels, suppressing lipid peroxidation, and improving NOx levels. CONCLUSION These findings suggest the therapeutic potential of GTE in alleviating the cardiovascular impairments of chronic REM sleep deprivation, emphasizing its candidacy for further clinical exploration as a natural intervention in sleep-related disorders and associated cardiovascular risks.
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Affiliation(s)
- Yonca Coluk
- Department of Otorhinolaryngology, Faculty of Medicine, Giresun University, Giresun, 28200, Turkey.
| | - Emine Gulceri Gulec Peker
- Department of Natural and Mathematical Sciences, Faculty of Engineering, Giresun University, Giresun, 28200, Turkey
| | - Sembol Yildirmak
- Department of Biochemistry, Faculty of Medicine, Mersin University, Mersin, 33010, Turkey
| | - Arif Keskin
- Department of Anatomy, Faculty of Medicine, Giresun University, Giresun, 28200, Turkey
| | - Guven Yildirim
- Private Practice, Otorhinolaryngology, İstanbul, 34360, Turkey
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Li S, Fong DYT, Wang YZ, Lin Z, Shang XC, Gong WJ. Nonrestorative sleep and its associated factors in Chinese adolescents and the moderation effects of coffee or tea consumption. BMC Public Health 2024; 24:2398. [PMID: 39227890 PMCID: PMC11373256 DOI: 10.1186/s12889-024-19936-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2024] [Accepted: 08/29/2024] [Indexed: 09/05/2024] Open
Abstract
BACKGROUND Nonrestorative sleep (NRS) is related to numerous adverse outcomes. There is rare evidence of its associated factors, especially in Chinese adolescents. This study aimed to explore the factors associated with NRS in Chinese adolescents and the potential moderation effects of coffee or tea consumption. METHODS This cross-sectional study invited adolescents attending Grades 7-11 in Nanjing, China, to complete a self-administered questionnaire, including their NRS, stress, anxiety, physical symptoms, depression, sociodemographics, and lifestyles. Linear regressions were applied to investigate the associated factors of their NRS, with the moderation effects of coffee or tea consumption and other characteristics being tested by additionally including their interactions. RESULTS Totally 481 adolescents (49% male, age 15.5 ± 1.5 years) were enrolled, with the average global NRS score of 42.16 ± 7.57. Higher family income (β = 2.01, P = 0.007), longer sleep duration (β = 2.33, P = 0.011), and moderate after-class activity (β = 1.50, P = 0.044) contributed less NRS, while higher educational level (β = -2.60, P = 0.033), more coffee or tea consumption (β = -1.68, P = 0.013), physical symptoms (β = -3.85, P < 0.001), stress (β = -0.23, P = 0.005), anxiety (β = -1.54, P = 0.045), and depression (β = -0.13, P = 0.014) contributed more NRS. Females (β = 0.82, P = 0.005), older age (β = -0.46, P = 0.029), and higher education level (β = -1.68, P < 0.001) contributed less refreshment from sleep, more physical/medical symptoms of NRS, and less daytime function, respectively. Coffee or tea consumption moderated the associations of somatic symptoms (β = 0.25, P = 0.021), stress (β = 0.29, P = 0.022), anxiety (β = 0.27, P = 0.005), and depression (β = 0.17, P = 0.021) with NRS. CONCLUSIONS Longer sleep duration, moderate after-class activity, reduced coffee or tea consumption, and promotion of physical and mental health may help reduce adolescents' NRS. Coffee or tea consumption may help buffer the negative associations of somatic symptoms, stress, anxiety, and depression with NRS.
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Affiliation(s)
- Sha Li
- School of Nursing, Nanjing Medical University, 101 Longmian Avenue, Nanjing, Jiangsu, 211166, China
| | - Daniel Yee Tak Fong
- School of Nursing, Li Ka Shing Faculty of Medicine, The University of Hong Kong, 3 Sassoon Road, Pokfulam, Hong Kong SAR, 999077, China
| | - Yan Zhe Wang
- School of Nursing, Nanjing Medical University, 101 Longmian Avenue, Nanjing, Jiangsu, 211166, China
| | - Zheng Lin
- School of Nursing, Nanjing Medical University, 101 Longmian Avenue, Nanjing, Jiangsu, 211166, China
| | - Xing Chen Shang
- School of Nursing, Li Ka Shing Faculty of Medicine, The University of Hong Kong, 3 Sassoon Road, Pokfulam, Hong Kong SAR, 999077, China.
- School of Nursing & School of Public Health, Yangzhou University, 136 Jiangyang Middle Road, Yangzhou, Jiangsu, 225009, China.
| | - Wei Jie Gong
- South China Hospital, Medical School, Shenzhen University, 1 Fuxin Road, Shenzhen, Guangdong, 518111, China.
- Department of Family Medicine, Medical School, Shenzhen University, 1066 Xueyuan Road, Shenzhen, Guangdong, 518055, China.
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Martins Teixeira C, Bressan J, Carla Gualandi Leal A, Ribeiro SAV, Lopes Juvanhol L, Marçal Pimenta A, Hermsdorff HHM. Higher caffeine consumption is associated with insufficient sleep time in Brazilian adults (CUME study). Int J Food Sci Nutr 2023:1-9. [PMID: 37905496 DOI: 10.1080/09637486.2023.2267793] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Accepted: 10/02/2023] [Indexed: 11/02/2023]
Abstract
We aimed to evaluate the association between caffeine intake and sleep time in Brazilian adults. This cross-sectional study was conducted with 6,356 participants from the Cohort of Universities of Minas Gerais (CUME Study). Data was collected through an online self-report questionnaire. Of the total, 31.9% of the participants had insufficient sleep. Women were found to sleep less than men (64.1 vs. 35.9%; p < 0.001), as well as being more likely to consume higher doses of caffeine (55.2%, p < 0.001). Coffee (35.7%), dark chocolate (25.2%), milk chocolate (15.2%), and diet soda (11.0%) were the foods that more contributed to caffeine intake. Individuals in the highest quartile of caffeine intake (87.0 - 572.0 mg/day) had a 19% higher prevalence of insufficient sleep compared with the lowest quartile (PR: 1.19; 95%CI: 1.08 - 1.31). Future studies are needed to investigate the genetic and hormonal factors involved in the interindividual response in this population.
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Affiliation(s)
- Carolynne Martins Teixeira
- Department of Nutrition and Health, Laboratory of Energy Metabolism and Body Composition, Universidade Federal de Viçosa, Viçosa, Minas Gerais, Brazil
| | - Josefina Bressan
- Department of Nutrition and Health, Laboratory of Energy Metabolism and Body Composition, Universidade Federal de Viçosa, Viçosa, Minas Gerais, Brazil
| | - Arieta Carla Gualandi Leal
- Department of Nutrition and Health, Laboratory of Energy Metabolism and Body Composition, Universidade Federal de Viçosa, Viçosa, Minas Gerais, Brazil
| | - Sarah Aparecida Vieira Ribeiro
- Department of Nutrition and Health, Laboratory of Nutritional Epidemiology, Universidade Federal de Viçosa, Viçosa, Minas Gerais, Brazil
| | - Leidjaira Lopes Juvanhol
- Department of Nutrition and Health, Laboratory of Nutritional Epidemiology, Universidade Federal de Viçosa, Viçosa, Minas Gerais, Brazil
| | | | - Helen Hermana Miranda Hermsdorff
- Department of Nutrition and Health, Laboratory of Energy Metabolism and Body Composition, Universidade Federal de Viçosa, Viçosa, Minas Gerais, Brazil
- Institute of Public Policies and Sustainable Development, Universidade Federal de Viçosa, Viçosa, Minas Gerais, Brazil
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Cook JD, Gratton MKP, Bender AM, Werthner P, Lawson D, Pedlar CR, Kipps C, Bastien CH, Samuels CH, Charest J. Sleep Health, Individual Characteristics, Lifestyle Factors, and Marathon Completion Time in Marathon Runners: A Retrospective Investigation of the 2016 London Marathon. Brain Sci 2023; 13:1346. [PMID: 37759947 PMCID: PMC10527296 DOI: 10.3390/brainsci13091346] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2023] [Revised: 09/08/2023] [Accepted: 09/18/2023] [Indexed: 09/29/2023] Open
Abstract
Despite sleep health being critically important for athlete performance and well-being, sleep health in marathoners is understudied. This foundational study explored relations between sleep health, individual characteristics, lifestyle factors, and marathon completion time. Data were obtained from the 2016 London Marathon participants. Participants completed the Athlete Sleep Screening Questionnaire (ASSQ) along with a brief survey capturing individual characteristics and lifestyle factors. Sleep health focused on the ASSQ sleep difficulty score (SDS) and its components. Linear regression computed relations among sleep, individual, lifestyle, and marathon variables. The analytic sample (N = 943) was mostly male (64.5%) and young adults (66.5%). A total of 23.5% of the sample reported sleep difficulties (SDS ≥ 8) at a severity warranting follow-up with a trained sleep provider. Middle-aged adults generally reported significantly worse sleep health characteristics, relative to young adults, except young adults reported significantly longer sleep onset latency (SOL). Sleep tracker users reported worse sleep satisfaction. Pre-bedtime electronic device use was associated with longer SOL and longer marathon completion time, while increasing SOL was also associated with longer marathon completion. Our results suggest a deleterious influence of pre-bedtime electronic device use and sleep tracker use on sleep health in marathoners. Orthosomnia may be a relevant factor in the relationship between sleep tracking and sleep health for marathoners.
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Affiliation(s)
- Jesse D. Cook
- Department of Psychiatry, University of Wisconsin-Madison, Madison, WI 53706, USA
- Department of Psychology, University of Wisconsin-Madison, Madison, WI 53706, USA
| | - Matt K. P. Gratton
- Division of Medical Informatics, Department of Internal Medicine, University of Kansas Medical Center, Kansas City, MO 66160, USA;
- Social and Behavioral Sciences, Psychology, University of Kansas, Lawrence, KS 66045, USA
| | - Amy M. Bender
- Faculty of Kinesiology, University of Calgary, Calgary, AB T2N 1N4, Canada; (A.M.B.); (P.W.); (C.H.S.); (J.C.)
| | - Penny Werthner
- Faculty of Kinesiology, University of Calgary, Calgary, AB T2N 1N4, Canada; (A.M.B.); (P.W.); (C.H.S.); (J.C.)
| | - Doug Lawson
- Centre for Sleep and Human Performance, Calgary, AB T2X 3V4, Canada;
| | - Charles R. Pedlar
- Faculty of Sport, Allied Health, and Performance Science, Twickenham, St Mary’s University, London TW1 4SX, UK;
- Institute of Sport, Exercise and Health, University College London, London WC1E 6JB, UK;
| | - Courtney Kipps
- Institute of Sport, Exercise and Health, University College London, London WC1E 6JB, UK;
| | - Celyne H. Bastien
- École de Psychologie, Université Laval, Québec City, QC G1V 0A6, Canada;
| | - Charles H. Samuels
- Faculty of Kinesiology, University of Calgary, Calgary, AB T2N 1N4, Canada; (A.M.B.); (P.W.); (C.H.S.); (J.C.)
- Centre for Sleep and Human Performance, Calgary, AB T2X 3V4, Canada;
- Faculty of Medicine, University of Calgary, Calgary, AB T2N 1N4, Canada
| | - Jonathan Charest
- Faculty of Kinesiology, University of Calgary, Calgary, AB T2N 1N4, Canada; (A.M.B.); (P.W.); (C.H.S.); (J.C.)
- Centre for Sleep and Human Performance, Calgary, AB T2X 3V4, Canada;
- École de Psychologie, Université Laval, Québec City, QC G1V 0A6, Canada;
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Kim CW, Jeong SC, Hwang SW, Hui S, Kim SH. Evidence of sleep duration and weekend sleep recovery impact on suicidal ideation in adolescents with allergic rhinitis. J Clin Sleep Med 2021; 17:1521-1532. [PMID: 34313214 PMCID: PMC8656896 DOI: 10.5664/jcsm.9004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
STUDY OBJECTIVES Sleep problems are common in allergic rhinitis (AR) and are a modifiable risk factor for suicidal ideation. However, the effect of sleep duration and weekend catch-up sleep (WCUS)-sleep time on weekends that exceeds sleep time on weekdays-on suicidal ideation for adolescents with AR is unknown. The objective of this study was to explore whether sleep duration and WCUS have an impact on suicidal ideation among adolescents with AR. METHODS From the annual Korean Youth Risk Behavior Web-Based Surveys (completed from 2013-2017), data were obtained from a stratified, multistage, clustered sample. Using self-reported questionnaires, students provided doctor-diagnosed AR and sleep time. RESULTS Among 134,417 and 262,653 adolescents with and without AR, respectively, those with AR compared with those without AR had more sleep dissatisfaction (46.6% vs 40.8%), slept less (sleep duration: 6.71 ± 1.37 hours vs 7.01 ± 1.48 hours), and had longer WCUS (3.46 ± 0.11 hours vs 2.11 ± 0.14 hours). After adjustment, the odds ratio of patients with sleep dissatisfaction was a 1.22 (95% confidence interval, 1.17-1.28) times higher risk of suicidal ideation than in those with sleep satisfaction. For average sleep duration (defining 7-8 hours as the reference), the odds ratio of short sleep (≤ 5 hours) was 1.45 (95% confidence interval, 1.32-1.53). Notably, long WCUS (≥ 2 hours) was significantly associated with decreased suicidal ideation (odds ratio, 0.85; 95% confidence interval, 0.81-0.92). CONCLUSIONS Although further research is needed to clarify this association, under the condition of sleep deprivation, WCUS at a certain extent may be associated with a low risk for suicidal ideation in adolescents with AR. CITATION Kim CW, Jeong SC, Hwang SW, Jo SH, Kim SH. Evidence of sleep duration and weekend sleep recovery impact on suicidal ideation in adolescents with allergic rhinitis. J Clin Sleep Med. 2021;17(8):1521-1532.
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Affiliation(s)
- Chang Woon Kim
- Department of Obstetrics and Gynecology, Samsung Changwon Hospital, Sungkyunkwan University School of Medicine, Changwon, Republic of Korea
| | - Seung Chan Jeong
- Department of Urology, Samsung Changwon Hospital, Sungkyunkwan University School of Medicine, Changwon, Republic of Korea
| | - Sang Won Hwang
- Department of Thoracic and Cardiovascular Surgery, Samsung Changwon Hospital, Sungkyunkwan University School of Medicine, Changwon, Republic of Korea
| | - Seon Hui
- Department of Biostatistics, Samsung Changwon Hospital, Sungkyunkwan University School of Medicine, Changwon, Republic of Korea
| | - Sung Hoon Kim
- Department of Pediatrics, Samsung Changwon Hospital, Sungkyunkwan University School of Medicine, Changwon, Republic of Korea
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Galan-Lopez P, Domínguez R, Gísladóttir T, Sánchez-Oliver AJ, Pihu M, Ries F, Klonizakis M. Sleep Quality and Duration in European Adolescents (The AdolesHealth Study): A Cross-Sectional, Quantitative Study. CHILDREN (BASEL, SWITZERLAND) 2021; 8:188. [PMID: 33802334 PMCID: PMC7999763 DOI: 10.3390/children8030188] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Revised: 02/23/2021] [Accepted: 02/25/2021] [Indexed: 12/13/2022]
Abstract
Sleep is a vital element of adolescents' overall health; it influences their body and mind and thus affects their quality of life. Adequate sleep quality and duration are essential for maintaining optimal metabolic health and lowering the risk of developing several medical conditions, such as cardiovascular disease. The current study aimed to assess the perceived sleep quality and duration of 1717 European adolescents from three different European countries (Spain, Iceland and Estonia) aged 13- to 16-years (900 boys, 817 girls) using the Pittsburgh Sleep Quality Index (PSQI). A multivariate analysis of variance (MANOVA) was performed to examine differences between groups and two-factor analysis of variance (ANOVA) was used to analyze city and age differences. The probability of having poor sleep quality and duration was calculated by Odd-Ratio (OR). Our study found poor sleep quality in 44% of the boys and 53% of the girls, whereas 68% and 69%, respectively did not get the recommended hours of sleep (i.e., 8-10 h). No difference was found between adolescents from Estonia, Iceland and Spain regarding sleep duration. In contrast, Spanish and Estonian adolescents reported higher probabilities of having poor sleep quality. Finally, girls had a significantly higher probability of poor sleep quality than boys.
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Affiliation(s)
- Pablo Galan-Lopez
- Department of Communication and Education, Universidad Loyola Andalucía, 41704 Dos Hermanas (Sevilla), Spain;
| | - Raúl Domínguez
- Physical Education and Sports, Faculty of Educational Sciences, University of Seville, 41013 Sevilla (Sevilla), Spain; (R.D.); (F.R.)
| | - Thordis Gísladóttir
- Research Center for Sport and Health Sciences, School of Education, University of Iceland, 105 Reykjavík, Iceland;
| | | | - Maret Pihu
- Institute of Sport Sciences and Physiotherapy, Faculty of Medicine, University of Tartu, 51005 Tartu, Estonia;
| | - Francis Ries
- Physical Education and Sports, Faculty of Educational Sciences, University of Seville, 41013 Sevilla (Sevilla), Spain; (R.D.); (F.R.)
| | - Markos Klonizakis
- Lifestyle, Exercise and Nutrition Improvement (LENI) Research Group, Department of Nursing and Midwifery, College of Health, Wellbeing and Life Sciences, Sheffield Hallam University, Sheffield S1 1WB, UK;
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Ogeil RP, Prasad S, O'Driscoll DM, Li WYH, Lubman DI, Young AC. Psychoactive drug and medication use among patients referred to a tertiary sleep laboratory population. Psychiatry Res 2020; 294:113545. [PMID: 33212412 DOI: 10.1016/j.psychres.2020.113545] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/25/2020] [Accepted: 10/24/2020] [Indexed: 11/30/2022]
Abstract
Psychoactive drugs including alcohol, caffeine, and prescription medications are commonly consumed to alter sleep/wake states, however the prevalence and impact of these drugs among populations seeking assessment from sleep physicians are unknown. We investigated the prevalence of commonly used drugs (alcohol and caffeine), and medications in a population (N=120; 50 females and 70 males) attending a tertiary sleep clinic for diagnostic polysomnography (PSG) assessment. In addition to objective sleep assessment, participants completed questionnaires assessing sleep quality (Pittsburgh Sleep Quality Index, PSQI), daytime sleepiness (Epworth Sleepiness Scale, ESS), depression and anxiety (Hospital Anxiety and Depression Scale, HADS), alcohol use (Alcohol Use Disorders Identification Test, AUDIT), caffeine and medication use, as well as their experience of adverse events (motor vehicle accidents and near-miss crashes). Caffeine was consumed by 90% of the population and was associated with a reduction in excessive sleepiness symptomology; while high AUDIT scores were associated with increased near-miss crashes. Polypharmacy was common, with a greater number of medications associated with poorer sleep quality, and changes in sleep architecture. This study maps commonly used drugs in those attending a tertiary sleep clinic, and demonstrates associations between drug use and sleep outcomes assessed objectively and subjectively.
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Affiliation(s)
- Rowan P Ogeil
- Eastern Health Clinical School, Monash University, 5 Arnold Street, Box Hill 3128, VIC, Australia; Turning Point, Eastern Health, 110 Church Street, Richmond 3121, VIC, Australia; Monash Addiction Research Centre (MARC), Monash University, Peninsula Campus, Level 3, Building G, Moorooduc Hwy, Frankston 3199, VIC, Australia.
| | - Shivonne Prasad
- Department of Respiratory and Sleep Medicine, Eastern Health, Melbourne, Australia
| | - Denise M O'Driscoll
- Eastern Health Clinical School, Monash University, 5 Arnold Street, Box Hill 3128, VIC, Australia; Department of Respiratory and Sleep Medicine, Eastern Health, Melbourne, Australia
| | - William Y H Li
- Department of Respiratory and Sleep Medicine, Eastern Health, Melbourne, Australia
| | - Dan I Lubman
- Eastern Health Clinical School, Monash University, 5 Arnold Street, Box Hill 3128, VIC, Australia; Turning Point, Eastern Health, 110 Church Street, Richmond 3121, VIC, Australia; Monash Addiction Research Centre (MARC), Monash University, Peninsula Campus, Level 3, Building G, Moorooduc Hwy, Frankston 3199, VIC, Australia
| | - Alan C Young
- Eastern Health Clinical School, Monash University, 5 Arnold Street, Box Hill 3128, VIC, Australia; Department of Respiratory and Sleep Medicine, Eastern Health, Melbourne, Australia
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Hu Y, Stephenson K, Klare D. The dynamic relationship between daily caffeine intake and sleep duration in middle-aged and older adults. J Sleep Res 2020; 29:e12996. [PMID: 32057160 DOI: 10.1111/jsr.12996] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2019] [Revised: 12/30/2019] [Accepted: 01/22/2020] [Indexed: 02/01/2023]
Abstract
The effect of caffeine on sleep has been well documented. However, most studies examined this relationship in laboratories or used a cross-sectional design analysing between-person differences. This study investigated the within-person relationship between caffeine intake and sleep duration at home. In a national database, 377 participants (aged 35-85 years) completed a 7-day diary study. Sleep duration was measured by Actigraphy and caffeine intake was self-reported in sleep logs. Three analytic strategies were used. The average sleep duration and the average caffeine intake were not significantly correlated. Multilevel regressions using daytime caffeine intake to predict night-time sleep, and using night-time sleep to predict next day caffeine intake, also did not detect any significant effect. Then dynamical systems analysis was performed, where the daily change rate and change tendency of caffeine and sleep were estimated, and the relationship among these momentums was examined. Results revealed a significant effect of sleep duration on the change tendency of caffeine use: a shorter sleep duration predicted a stronger tendency to consume caffeine, and this phenomenon was only found in middle-aged adults (aged 35-55 years) not in older adults (aged 55+). This study did not detect any effect of daily caffeine intake on sleep duration, implying that habitual use of caffeine in real life may not coincide with laboratory findings, and that using caffeine to compensate for sleep loss is the habit of middle-aged adults, not the elderly. The advantage of using a dynamic approach to analyse interrelated processes with uncertain time lags is also highlighted.
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Affiliation(s)
- Yueqin Hu
- Texas State University, San Marcos, Texas
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Lysen TS, Wolters FJ, Luik AI, Ikram MK, Tiemeier H, Ikram MA. Subjective Sleep Quality is not Associated with Incident Dementia: The Rotterdam Study. J Alzheimers Dis 2019; 64:239-247. [PMID: 29865066 DOI: 10.3233/jad-180055] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
BACKGROUND Poor sleep is related to higher dementia risk, but this association is more equivocal for subjective sleep quality specifically. This study investigates the link between subjective sleep quality and dementia risk in the general population. OBJECTIVE To study the role of subjective sleep quality in the risk of dementia in the general population. METHODS In the prospective population-based Rotterdam Study, 4,835 persons (mean age 72 years, 58% women) underwent a home interview (2002- 2006) that included the validated Pittsburgh Sleep Quality Index (PSQI) to assess sleep quality. Participants were followed until 2015 for incident dementia, through in-person screening and continuous monitoring of medical records. We used Cox regression models to associate sleep quality with dementia risk, adjusting for age, sex, education, smoking, employment, coffee consumption, alcohol consumption, activities of daily living, cardiovascular risk factors, anxiety, depressive symptoms, cognition, and snoring. RESULTS During 41,385 person-years (8.5 years mean), 420 participants developed dementia, of whom 320 Alzheimer's disease (AD). Poorer subjective sleep quality was not associated with the risk of all-cause dementia (hazard ratio [HR] per SD increase in PSQI score: 0.91, 95% CI 0.82- 1.02) or AD (HR 0.92, 95% CI 0.81- 1.05). Similarly, individual components of the PSQI were also not associated with dementia. Several sensitivity analyses, i.e., excluding last years of the follow-up time duration or restricting to those with best MMSE scores at baseline, did not reveal subgroups with increased risks. CONCLUSION In this study, we found no association of poor subjective sleep quality with higher risk of dementia.
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Affiliation(s)
- Thom S Lysen
- Department of Epidemiology, Erasmus Medical Center, Rotterdam, The Netherlands
| | - Frank J Wolters
- Department of Epidemiology, Erasmus Medical Center, Rotterdam, The Netherlands.,Department of Neurology, Erasmus Medical Center, Rotterdam, The Netherlands
| | - Annemarie I Luik
- Department of Epidemiology, Erasmus Medical Center, Rotterdam, The Netherlands.,Sleep and Circadian Neuroscience Institute, Nuffield Department of Clinical Neurosciences, University of Oxford, Oxford, UK
| | - M Kamran Ikram
- Department of Epidemiology, Erasmus Medical Center, Rotterdam, The Netherlands.,Department of Neurology, Erasmus Medical Center, Rotterdam, The Netherlands
| | - Henning Tiemeier
- Department of Epidemiology, Erasmus Medical Center, Rotterdam, The Netherlands.,Department of Psychiatry, Erasmus Medical Center, Rotterdam, The Netherlands
| | - M Arfan Ikram
- Department of Epidemiology, Erasmus Medical Center, Rotterdam, The Netherlands
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