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Yöndem ZN, Çıtak Bilgin N. Dysmenorrhea among hospital nurses and its effects on work life*,**,***. Health Care Women Int 2022; 43:997-1014. [DOI: 10.1080/07399332.2020.1800015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
| | - Nevin Çıtak Bilgin
- Faculty of Health Sciences, Department of Obstetrics and Gynecology Nursing, Bolu Abant İzzet Baysal University, Bolu, Turkey
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2
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Moralia MA, Quignon C, Simonneaux M, Simonneaux V. Environmental disruption of reproductive rhythms. Front Neuroendocrinol 2022; 66:100990. [PMID: 35227765 DOI: 10.1016/j.yfrne.2022.100990] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/01/2021] [Revised: 01/06/2022] [Accepted: 02/21/2022] [Indexed: 12/17/2022]
Abstract
Reproduction is a key biological function requiring a precise synchronization with annual and daily cues to cope with environmental fluctuations. Therefore, humans and animals have developed well-conserved photoneuroendocrine pathways to integrate and process daily and seasonal light signals within the hypothalamic-pituitary-gonadal axis. However, in the past century, industrialization and the modern 24/7 human lifestyle have imposed detrimental changes in natural habitats and rhythms of life. Indeed, exposure to an excessive amount of artificial light at inappropriate timing because of shift work and nocturnal urban lighting, as well as the ubiquitous environmental contamination by endocrine-disrupting chemicals, threaten the integrity of the daily and seasonal timing of biological functions. Here, we review recent epidemiological, field and experimental studies to discuss how light and chemical pollution of the environment can disrupt reproductive rhythms by interfering with the photoneuroendocrine timing system.
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Affiliation(s)
- Marie-Azélie Moralia
- Université de Strasbourg, Centre National de la Recherche Scientifique, Institut des Neurosciences Cellulaires et Intégratives, Strasbourg, France
| | - Clarisse Quignon
- Université de Strasbourg, Centre National de la Recherche Scientifique, Institut des Neurosciences Cellulaires et Intégratives, Strasbourg, France
| | - Marine Simonneaux
- Université de Strasbourg, Centre National de la Recherche Scientifique, Institut des Neurosciences Cellulaires et Intégratives, Strasbourg, France
| | - Valérie Simonneaux
- Université de Strasbourg, Centre National de la Recherche Scientifique, Institut des Neurosciences Cellulaires et Intégratives, Strasbourg, France.
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3
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Spaggiari G, Romeo M, Casarini L, Granata ARM, Simoni M, Santi D. Human fertility and sleep disturbances: A narrative review. Sleep Med 2022; 98:13-25. [PMID: 35772248 DOI: 10.1016/j.sleep.2022.06.009] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/14/2022] [Revised: 06/06/2022] [Accepted: 06/10/2022] [Indexed: 11/18/2022]
Abstract
INTRODUCTION Many factors may be hidden behind the global fertility decline observed in Western countries. Alongside the progressively increased age of infertile couples, environmental and behavioural factors, including non-optimal lifestyle habits, should be considered. Among these, sleep disorders have been suggested to be linked to human fertility. METHODS This is a narrative review, describing first sleep physiology, its disturbances, and the tools able to quantify sleep dysfunction. Then, we consider all available studies aimed at investigating the connection between sleep disorders and human fertility, providing a comprehensive view on this topic. RESULTS Forty-two studies investigating the relationship between sleep habits and human reproduction were included. All the published evidence was grouped according to the aspect of human fertility considered, i.e. i) female reproductive functions, ii) male reproductive functions, iii) natural conception and iv) assisted reproduction. For each of the sub-groups considered, the connection between sleep dysregulation and human fertility was classified according to specific sleep characteristics, such as sleep duration, quality, and habits. In addition, possible physio-pathological mechanisms proposed to support the link between sleep and fertility were summarized. CONCLUSION This review summarizes the most relevant findings about the intricate and still largely unknown network of molecular pathways involved in the regulation of circadian homeostasis, to which sleep contributes, essential for reproductive physiology. Thus, many mechanisms seem correlate sleep disorders to reproductive health, such as adrenal activation, circadian dysregulation, and genetic influences. This review highlights the need to properly designed trials on the topic.
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Affiliation(s)
- Giorgia Spaggiari
- Unit of Endocrinology, Department of Medical Specialties, Azienda Ospedaliero-Universitaria of Modena, Ospedale Civile of Baggiovara, Modena, Italy
| | - Marilina Romeo
- Unit of Endocrinology, Department of Medical Specialties, Azienda Ospedaliero-Universitaria of Modena, Ospedale Civile of Baggiovara, Modena, Italy; Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, Modena, Italy
| | - Livio Casarini
- Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, Modena, Italy
| | - Antonio R M Granata
- Unit of Endocrinology, Department of Medical Specialties, Azienda Ospedaliero-Universitaria of Modena, Ospedale Civile of Baggiovara, Modena, Italy
| | - Manuela Simoni
- Unit of Endocrinology, Department of Medical Specialties, Azienda Ospedaliero-Universitaria of Modena, Ospedale Civile of Baggiovara, Modena, Italy; Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, Modena, Italy
| | - Daniele Santi
- Unit of Endocrinology, Department of Medical Specialties, Azienda Ospedaliero-Universitaria of Modena, Ospedale Civile of Baggiovara, Modena, Italy; Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, Modena, Italy.
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4
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Beroukhim G, Esencan E, Seifer DB. Impact of sleep patterns upon female neuroendocrinology and reproductive outcomes: a comprehensive review. Reprod Biol Endocrinol 2022; 20:16. [PMID: 35042515 PMCID: PMC8764829 DOI: 10.1186/s12958-022-00889-3] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Accepted: 01/06/2022] [Indexed: 12/17/2022] Open
Abstract
Sleep is vital to human bodily function. Growing evidence indicates that sleep deprivation, disruption, dysrhythmia, and disorders are associated with impaired reproductive function and poor clinical outcomes in women. These associations are largely mediated by molecular-genetic and hormonal pathways, which are crucial for the complex and time sensitive processes of hormone synthesis/secretion, folliculogenesis, ovulation, fertilization, implantation, and menstruation. Pathologic sleep patterns are closely linked to menstrual irregularity, polycystic ovarian syndrome, premature ovarian insufficiency, sub/infertility, and early pregnancy loss. Measures of success with assisted reproductive technology are also lower among women who engage in shift work, or experience sleep disruption or short sleep duration. Extremes of sleep duration, poor sleep quality, sleep disordered breathing, and shift work are also associated with several harmful conditions in pregnancy, including gestational diabetes and hypertensive disorders. While accumulating evidence implicates pathologic sleep patterns in impaired reproductive function and poor reproductive outcomes, additional research is needed to determine causality and propose therapeutic interventions.
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Affiliation(s)
- Gabriela Beroukhim
- Department of Obstetrics, Gynecology, and Reproductive Sciences at Yale School of Medicine, 333 Cedar St, New Haven, CT, 06510, USA.
| | - Ecem Esencan
- Department of Obstetrics, Gynecology, and Reproductive Sciences at Yale School of Medicine, 333 Cedar St, New Haven, CT, 06510, USA
| | - David B Seifer
- Department of Obstetrics, Gynecology, and Reproductive Sciences at Yale School of Medicine, 333 Cedar St, New Haven, CT, 06510, USA
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Bottalico LN, Weljie AM. Cross-species physiological interactions of endocrine disrupting chemicals with the circadian clock. Gen Comp Endocrinol 2021; 301:113650. [PMID: 33166531 PMCID: PMC7993548 DOI: 10.1016/j.ygcen.2020.113650] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/20/2019] [Revised: 10/09/2020] [Accepted: 10/17/2020] [Indexed: 02/06/2023]
Abstract
Endocrine disrupting chemicals (EDCs) are endocrine-active chemical pollutants that disrupt reproductive, neuroendocrine, cardiovascular and metabolic health across species. The circadian clock is a transcriptional oscillator responsible for entraining 24-hour rhythms of physiology, behavior and metabolism. Extensive bidirectional cross talk exists between circadian and endocrine systems and circadian rhythmicity is present at all levels of endocrine control, from synthesis and release of hormones, to sensitivity of target tissues to hormone action. In mammals, a range of hormones directly alter clock gene expression and circadian physiology via nuclear receptor (NR) binding and subsequent genomic action, modulating physiological processes such as nutrient and energy metabolism, stress response, reproductive physiology and circadian behavioral rhythms. The potential for EDCs to perturb circadian clocks or circadian-driven physiology is not well characterized. For this reason, we explore evidence for parallel endocrine and circadian disruption following EDC exposure across species. In the reviewed studies, EDCs dysregulated core clock and circadian rhythm network gene expression in brain and peripheral organs, and altered circadian reproductive, behavioral and metabolic rhythms. Circadian impacts occurred in parallel to endocrine and metabolic alterations such as impaired fertility and dysregulated metabolic and energetic homeostasis. Further research is warranted to understand the nature of interaction between circadian and endocrine systems in mediating physiological effects of EDC exposure at environmental levels.
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Affiliation(s)
- Lisa N Bottalico
- Department of Systems Pharmacology and Translational Therapeutics, Institute for Translational Medicine and Therapeutics, Center of Excellence in Environmental Toxicology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.
| | - Aalim M Weljie
- Department of Systems Pharmacology and Translational Therapeutics, Institute for Translational Medicine and Therapeutics, Center of Excellence in Environmental Toxicology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.
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Yaw AM, McLane-Svoboda AK, Hoffmann HM. Shiftwork and Light at Night Negatively Impact Molecular and Endocrine Timekeeping in the Female Reproductive Axis in Humans and Rodents. Int J Mol Sci 2020; 22:E324. [PMID: 33396885 PMCID: PMC7795361 DOI: 10.3390/ijms22010324] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Revised: 12/24/2020] [Accepted: 12/25/2020] [Indexed: 01/17/2023] Open
Abstract
Shiftwork, including work that takes place at night (nightshift) and/or rotates between day and nightshifts, plays an important role in our society, but is associated with decreased health, including reproductive dysfunction. One key factor in shiftwork, exposure to light at night, has been identified as a likely contributor to the underlying health risks associated with shiftwork. Light at night disrupts the behavioral and molecular circadian timekeeping system, which is important for coordinated timing of physiological processes, causing mistimed hormone release and impaired physiological functions. This review focuses on the impact of shiftwork on reproductive function and pregnancy in women and laboratory rodents and potential underlying molecular mechanisms. We summarize the negative impact of shiftwork on female fertility and compare these findings to studies in rodent models of light shifts. Light-shift rodent models recapitulate several aspects of reproductive dysfunction found in shift workers, and their comparison with human studies can enable a deeper understanding of physiological and hormonal responses to light shifts and the underlying molecular mechanisms that may lead to reproductive disruption in human shift workers. The contributions of human and rodent studies are essential to identify the origins of impaired fertility in women employed in shiftwork.
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Affiliation(s)
| | | | - Hanne M. Hoffmann
- Department of Animal Science and the Reproductive and Developmental Science Program, Michigan State University, East Lansing, MI 48824, USA
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Impact of sleep on female and male reproductive functions: a systematic review. Fertil Steril 2020; 115:715-731. [PMID: 33054981 DOI: 10.1016/j.fertnstert.2020.08.1429] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Revised: 08/26/2020] [Accepted: 08/28/2020] [Indexed: 12/31/2022]
Abstract
OBJECTIVE To evaluate the association of sleep parameters on female and male reproductive functions. DESIGN Systematic review. SETTING Not applicable. PATIENT(S) Female and male individuals, either healthy or infertile. INTERVENTION(S) Relevant articles were identified according to the The Preferred Reporting Items for Systematic Reviews and Meta-analyses recommendations in the PubMed and EMBASE databases from January 1, 2000 to June 8, 2020. MAIN OUTCOME MEASURE(S) The association between sleep and ovary function, spermatic function, natural fertility, and in vitro fertilization (IVF) outcomes was assessed. RESULT(S) A total of 33 studies that looked at the association between sleep and either ovary function (n = 10), spermatic function (n = 12), natural fertility (n = 5), or IVF outcomes (n = 6) were included. Overall, female and male fertility, as well as IVF outcomes may be affected by short sleep duration, evening chronotype, or shift/night work schedules. However, the results were hardly comparable due to the heterogeneous study methodologies used. CONCLUSION(S) Sleep may be an original and innovative parameter to consider in the reproduction field. Further investigation is needed to elucidate how sleep and fertility are interrelated and how sleep might constitute a useful modifiable target in infertility management.
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Rahman SA, Grant LK, Gooley JJ, Rajaratnam SMW, Czeisler CA, Lockley SW. Endogenous Circadian Regulation of Female Reproductive Hormones. J Clin Endocrinol Metab 2019; 104:6049-6059. [PMID: 31415086 PMCID: PMC6821202 DOI: 10.1210/jc.2019-00803] [Citation(s) in RCA: 51] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/03/2019] [Accepted: 08/09/2019] [Indexed: 11/19/2022]
Abstract
CONTEXT Studies suggest that female reproductive hormones are under circadian regulation, although methodological differences have led to inconsistent findings. OBJECTIVE To determine whether circulating levels of reproductive hormones exhibit circadian rhythms. DESIGN Blood samples were collected across ∼90 consecutive hours, including 2 baseline days under a standard sleep-wake schedule and ∼50 hours of extended wake under constant routine (CR) conditions. SETTING Intensive Physiological Monitoring Unit, Brigham and Women's Hospital. PARTICIPANTS Seventeen healthy premenopausal women (22.8 ± 2.6 years; nine follicular; eight luteal). INTERVENTIONS Fifty-hour CR. MAIN OUTCOME MEASURES Plasma estradiol (E2), progesterone (P4), LH, FSH, SHBG, melatonin, and core body temperature. RESULTS All hormones exhibited significant 24-hour rhythms under both standard sleep-wake and CR conditions during the follicular phase (P < 0.05). In contrast, only FSH and SHBG were significantly rhythmic during the luteal phase. Rhythm acrophases and amplitudes were similar between standard sleep-wake and CR conditions. The acrophase occurred in the morning for P4; in the afternoon for FSH, LH, and SHBG; and during the night for E2. CONCLUSIONS Our results confirm previous reports of ∼24-hour rhythms in many female reproductive hormones in humans under ambulatory conditions but demonstrate that these hormones are under endogenous circadian regulation, defined as persisting in the absence of external time cues. These results may have important implications for the effects of circadian disruption on reproductive function.
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Affiliation(s)
- Shadab A Rahman
- Division of Sleep and Circadian Disorders, Department of Medicine, Brigham and Women’s Hospital, Boston, Massachusetts
- Division of Sleep Medicine, Harvard Medical School, Boston, Massachusetts
| | - Leilah K Grant
- Division of Sleep and Circadian Disorders, Department of Medicine, Brigham and Women’s Hospital, Boston, Massachusetts
- Division of Sleep Medicine, Harvard Medical School, Boston, Massachusetts
| | - Joshua J Gooley
- Division of Sleep and Circadian Disorders, Department of Medicine, Brigham and Women’s Hospital, Boston, Massachusetts
- Division of Sleep Medicine, Harvard Medical School, Boston, Massachusetts
| | - Shantha M W Rajaratnam
- Division of Sleep and Circadian Disorders, Department of Medicine, Brigham and Women’s Hospital, Boston, Massachusetts
- Division of Sleep Medicine, Harvard Medical School, Boston, Massachusetts
- Monash Institute of Cognitive and Clinical Neurosciences, School of Psychological Sciences, Monash University, Clayton, Victoria, Australia
| | - Charles A Czeisler
- Division of Sleep and Circadian Disorders, Department of Medicine, Brigham and Women’s Hospital, Boston, Massachusetts
- Division of Sleep Medicine, Harvard Medical School, Boston, Massachusetts
| | - Steven W Lockley
- Division of Sleep and Circadian Disorders, Department of Medicine, Brigham and Women’s Hospital, Boston, Massachusetts
- Division of Sleep Medicine, Harvard Medical School, Boston, Massachusetts
- Monash Institute of Cognitive and Clinical Neurosciences, School of Psychological Sciences, Monash University, Clayton, Victoria, Australia
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Liu C, Politch JA, Cullerton E, Go K, Pang S, Kuohung W. Impact of daylight savings time on spontaneous pregnancy loss in in vitro fertilization patients. Chronobiol Int 2017; 34:571-577. [PMID: 28156172 DOI: 10.1080/07420528.2017.1279173] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
Transition into daylight savings time (DST) has studied negative impacts on health, but little is known regarding impact on fertility. This retrospective cohort study evaluates DST impact on pregnancy and pregnancy loss rates in 1,654 autologous in vitro fertilization cycles (2009 to 2012). Study groups were identified based on the relationship of DST to embryo transfer. Pregnancy rates were similar in Spring and Fall (41.4%, 42.2%). Pregnancy loss rates were also comparable between Spring and Fall (15.5%, 17.1%), but rates of loss were significantly higher in Spring when DST occurred after embryo transfer (24.3%). Loss was marked in patients with a history of prior spontaneous pregnancy loss (60.5%).
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Affiliation(s)
| | - Joseph A Politch
- b Department of Obstetrics and Gynecology , Boston University School of Medicine , Boston , MA , USA
| | | | - Kathryn Go
- c IVF New England , Lexington , MA , USA
| | | | - Wendy Kuohung
- b Department of Obstetrics and Gynecology , Boston University School of Medicine , Boston , MA , USA
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10
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Hughes V. Safe night-shift work. Nurs Manag (Harrow) 2016; 47:30-36. [PMID: 27465965 DOI: 10.1097/01.numa.0000488857.54323.64] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Affiliation(s)
- Vickie Hughes
- Vickie Hughes is an associate professor at Appalachian State University in Boone, N.C
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Wang Y, Gu F, Deng M, Guo L, Lu C, Zhou C, Chen S, Xu Y. Rotating shift work and menstrual characteristics in a cohort of Chinese nurses. BMC WOMENS HEALTH 2016; 16:24. [PMID: 27145834 PMCID: PMC4857333 DOI: 10.1186/s12905-016-0301-y] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/22/2015] [Accepted: 04/20/2016] [Indexed: 11/25/2022]
Abstract
Background Shift work disrupts the circadian rhythm and may cause menstruation disorders. This study assessed the impact of shift work on menstrual cycle in a population of Chinese nurses. Methods Questionnaires on menstrual characteristics and shift schedules were sent to female nurses of the First Affiliated Hospital of Sun Yat-sen University (FAHSYSU) and Guanghua Hospital of Stomatology (GHHS), affiliated to Sun Yat-sen University. Part I was a cross-sectional study and included 139 nurses in GHHS who had regular 8:00–17:30 working (non-shift group), and 334 nurses from FAHSYSU who worked shifts, a response rate of 67.5 % and 59.6 %, respectively (age ≤ 50 years). Menstrual patterns were compared and age-adjusted relative risks of shift work were analyzed. Part II was a nested case–control study. Cases were nurses in Part I who had regular cycle with mean cycle length (MCL) of 25–31 days and but at least 3 days variation in MCL after starting shift work (n = 45). Controls consisted of 67 nurses with matching shift patterns and age, but no MCL changes. A control non-shift age-matched group consisted of 30 GHHS nurses with no MCL changes. A follow-up second questionnaire was sent 2 years later. Results In Part I, the shift group had a significantly higher proportion of nurses with menstrual cycle irregularity. The proportion of nurses with a cycle of 25–31 days decreased from 81.7 to 67.8 % after changing to shift work. Logistic regression analysis showed that night shift frequency was the only risk factor associated with cycle shortening. After adjusting for age, MCL was shorter when night work was performed > 7 times per month. In Part II, the mean change in MCL in the case group, including prolongation or shortening, was 4.115 ± 2.084 days after shift working. In the 2 years’ follow-up, the MCL of the study group did not recover to the original length. Conclusions Rotating shift work can increase the prevalence of menstrual cycle irregularity. Night shift frequency was the only risk factor associated with cycle reduced. Changes in MCL did not show recovery over a follow-up period of 2 years. Electronic supplementary material The online version of this article (doi:10.1186/s12905-016-0301-y) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Yizi Wang
- Reproductive Center, the 6th Building, the First Affiliated Hospital of Sun Yat-sen University, Zhongshan 2 Road No. 58, YueXiu District, Guangzhou, 510080, Guangdong Province, China
| | - Fang Gu
- Reproductive Center, the 6th Building, the First Affiliated Hospital of Sun Yat-sen University, Zhongshan 2 Road No. 58, YueXiu District, Guangzhou, 510080, Guangdong Province, China
| | - Mingfen Deng
- Reproductive Center, the 6th Building, the First Affiliated Hospital of Sun Yat-sen University, Zhongshan 2 Road No. 58, YueXiu District, Guangzhou, 510080, Guangdong Province, China
| | - Lan Guo
- Department of Biostatistics and Epidemiology, School of Public Health, Sun Yat-Sen University, Guangzhou, Guangdong Province, China
| | - Ciyong Lu
- Department of Biostatistics and Epidemiology, School of Public Health, Sun Yat-Sen University, Guangzhou, Guangdong Province, China
| | - Canquan Zhou
- Reproductive Center, the 6th Building, the First Affiliated Hospital of Sun Yat-sen University, Zhongshan 2 Road No. 58, YueXiu District, Guangzhou, 510080, Guangdong Province, China
| | - Shouzhen Chen
- Nursing Department, the First Affiliated Hospital of Sun Yat-sen University, Zhongshan 2 Road No.58, YueXiu District, Guangzhou, Guangdong Province, 510080, China.
| | - Yanwen Xu
- Reproductive Center, the 6th Building, the First Affiliated Hospital of Sun Yat-sen University, Zhongshan 2 Road No. 58, YueXiu District, Guangzhou, 510080, Guangdong Province, China.
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Yang CK, Wu RSC, Wu CH, Lin TRY, Tsai HD. Sleep deprivation enhances peripheral serotonin secretion to regulate the large follicle steroidogenesis of rats. Taiwan J Obstet Gynecol 2016; 54:260-5. [PMID: 26166337 DOI: 10.1016/j.tjog.2014.10.007] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/13/2014] [Indexed: 11/24/2022] Open
Abstract
OBJECTIVE Sleep deprivation (SD) leads to the disturbance of the estrous cycle. Serotonin, the levels of which increase with SD, has been shown to inhibit luteinizing hormone production and the receptor has been found in the follicles. In this study, the serotonin effect on preovulatory follicular steroidogenesis is investigated and the underlying mechanisms are elucidated. MATERIALS AND METHODS Female rats were subjected to SD for a time span of 1-4 days using the dish-over-water-method with a Rechtschaffen apparatus. Serum estradiol and serotonin concentrations were assessed; thereafter, they were evaluated with the effect of serotonin on the estradiol production and steroidogenic acute regulatory (StAR) protein expression in a serum-free culture system. Preovulatory follicles were dissected mechanically from the ovaries of 21-day-old rats, which induced follicle growth, and cultured for 24 hours with or without recombinant human follicle-stimulating hormone (FSH) in the presence or absence of serotonin. RESULTS SD, led to a significant decrease in serum estradiol concentrations, while serotonin concentrations were significantly elevated (all p < 0.05). Follicles were cultured with a constant dose of FSH (50 mIU/mL) and increasing doses of serotonin, estradiol production was reduced by 20%. The inhibitory effect of serotonin was concentration dependent. The addition of serotonin (0.1 μg/mL) decreased FSH-induced estradiol production and attenuated FSH-stimulated follicular StAR protein expression. The inhibitory effects of serotonin could be reduced by the serotonin receptor antagonist ketanserin. CONCLUSION These findings suggest that decreased serum estradiol concentrations in SD rats may be the result of serotonin-related inhibition of estradiol production and decreased large follicle expression of StAR protein.
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Affiliation(s)
- Chueh-Ko Yang
- Department of Biological Sciences, National Sun Yat-sen University, Kaohsiung, Taiwan, ROC; Department of Obstetrics and Gynecology, Changhua Christian Hospital, Changhua, Taiwan, ROC
| | - Rick Sai-Chuen Wu
- Department of Anesthesiology, China Medical University and Hospital, Taichung, Taiwan, ROC
| | - Cheng-Hsuan Wu
- Department of Obstetrics and Gynecology, Changhua Christian Hospital, Changhua, Taiwan, ROC
| | | | - Horng-Der Tsai
- Department of Obstetrics and Gynecology, Changhua Christian Hospital, Changhua, Taiwan, ROC.
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Koo M, Chen CH, Tsai KW, Lu MC, Lin SC. Ambulatory medical services utilization for menstrual disorders among female personnel of different medical professions in Taiwan: a nationwide retrospective cohort study. BMC WOMENS HEALTH 2015; 15:66. [PMID: 26306618 PMCID: PMC4550071 DOI: 10.1186/s12905-015-0220-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 02/15/2015] [Accepted: 08/07/2015] [Indexed: 12/18/2022]
Abstract
Background Menstrual disorders and their adverse symptoms can have a deleterious effect on both the private and working lives of women. Previous studies indicated that female nurses have elevated risk of menstrual disorders. Moreover, female nurses showed a higher incidence of ambulatory care visit for genitourinary diseases compared with other female medical personnel. However, little is known whether the medical services utilization for menstrual disorders were different among personnel from various medical professions. Therefore, the present study compared the ambulatory medical services utilization for menstrual disorders among personnel of six different medical professions in Taiwan using a nationwide, population-based health claim research database. Methods The National Health Insurance Research Database (NHIRD) was used to identify female medical professionals, aged 18 to 45 years, who obtained their licenses during January 1, 2000 to December 31, 2012. Personnel from six different medical professions were examined and they included (1) medical technologists and therapists, (2) registered nurses, (3) physicians, (4) doctors of Chinese medicine, (5) dentists, and (6) pharmacists. Diagnoses of menstrual disorders, based on International Classification of Diseases, Ninth Revision, Clinical Modification (ICD-9-CM) codes, were obtained from the ambulatory medical services utilization that occurred after their license date. Cox proportional hazards model was used to assess the hazards of medical services utilization for menstrual disorders using medical technologists and therapists as the reference category. Results A total of 7653 medical personnel were included in the analysis. Using the group containing medical technologists and therapists as the reference category, registered nurses (adjusted hazards ratio [AHR] = 1.13, p = 0.018) and doctors of Chinese medicine (AHR = 2.52, p < 0.001) showed a significant increased risk of medical services utilization for menstrual disorders. Conversely, physicians showed a significant decreased risk of medical services utilization for menstrual disorders (AHR = 0.58, p < 0.001). Regarding the nine specific menstrual disorders observed in this study, registered nurses and doctors of Chinese medicine showed an increased risk in six and four of them, respectively. Pharmacists showed an increased risk only in menorrhagia (AHR = 1.64, p = 0.020) and dentists showed no significant differences in any of the nine specific menstrual disorders compared with medical technologists and therapists. Physicians showed a significant decreased risk all specific menstrual disorders except menorrhagia and dysfunctional uterine bleeding. Conclusions Findings from this population-based cohort study revealed that, compared with medical technologists and therapists, registered nurses and doctors of Chinese medicine exhibited significant increased risks in medical services utilization for menstrual disorders whereas physicians showed a significant decreased risk in menstrual disorders. Further studies should be conducted to delineate whether the differences in the medical services utilization is an indicator of risk of menstrual disorders or the results of varying patterns of health care seeking behavior among women of different medical professions.
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Affiliation(s)
- Malcolm Koo
- Department of Medical Research, Dalin Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Dalin, Chiayi, Taiwan. .,Dalla Lana School of Public Health, University of Toronto, Ontario, Canada.
| | - Chien-Han Chen
- Division of Obstetrics and Gynecology, Dalin Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Chiayi, Taiwan.
| | - Kun-Wei Tsai
- Division of Geriatrics, Dalin Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, 2 Minsheng Road, Dalin, Chiayi, 62247, Taiwan.
| | - Ming-Chi Lu
- Division of Allergy, Immunology and Rheumatology, Dalin Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Dalin, Chiayi, Taiwan. .,School of Medicine, Tzu Chi University, Hualien, Taiwan.
| | - Shih-Chun Lin
- Division of Geriatrics, Dalin Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, 2 Minsheng Road, Dalin, Chiayi, 62247, Taiwan.
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14
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MOEN BE, BASTE V, MORKEN T, ALSAKER K, PALLESEN S, BJORVATN B. Menstrual characteristics and night work among nurses. INDUSTRIAL HEALTH 2015; 53:354-360. [PMID: 25914071 PMCID: PMC4551066 DOI: 10.2486/indhealth.2014-0214] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 10/18/2014] [Accepted: 03/19/2015] [Indexed: 06/04/2023]
Abstract
Night work has been associated with adverse effects in terms of reproductive health. Specifically, menstruation has been suggested to be negatively impacted by night work, which again may influence fertility. This study investigated whether working nights is related to menstrual characteristics and if there is a relationship between shift work disorder (SWD) and menstruation. The study was cross-sectional, response rate 38%. The sample comprised female nurses who were members of the Norwegian Nurses Association; below 50 yr of age, who were not pregnant, did not use hormonal pills or intrauterine devices and who had not reached menopause (n=766). The nurses answered a postal survey including questions about night work and menstrual characteristics. Fifteen per cent reported to have irregular menstruations. Thirty-nine per cent of the nurses were classified as having SWD. Logistic regression analyses concerning the relationship between irregular menstruations and night work did not show any associations. Furthermore, no associations were found between cycle length or bleeding period and night work parameters. No associations were found between menstrual characteristics and SWD.
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Affiliation(s)
- Bente E. MOEN
- Centre for International Health, University of Bergen,
Norway
- Department of Global Public Health and Primary Care,
University of Bergen, Norway
| | - Valborg BASTE
- Department of Global Public Health and Primary Care,
University of Bergen, Norway
| | - Tone MORKEN
- Department of Global Public Health and Primary Care,
University of Bergen, Norway
- National Centre for Emergency Primary Health Care, Uni
Health, Uni Research, Norway
| | - Kjersti ALSAKER
- National Centre for Emergency Primary Health Care, Uni
Health, Uni Research, Norway
- Faculty of Public Health and Social Sciences, Bergen
University College, Norway
| | - Ståle PALLESEN
- Norwegian Competence Center for Sleep Disorders, Haukeland
University Hospital, Norway
- Department of Psychosocial Science, University of Bergen,
Norway
| | - Bjørn BJORVATN
- Department of Global Public Health and Primary Care,
University of Bergen, Norway
- Norwegian Competence Center for Sleep Disorders, Haukeland
University Hospital, Norway
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15
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Simonneaux V, Bahougne T. A Multi-Oscillatory Circadian System Times Female Reproduction. Front Endocrinol (Lausanne) 2015; 6:157. [PMID: 26539161 PMCID: PMC4611855 DOI: 10.3389/fendo.2015.00157] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/14/2015] [Accepted: 09/21/2015] [Indexed: 01/14/2023] Open
Abstract
Rhythms in female reproduction are critical to insure that timing of ovulation coincides with oocyte maturation and optimal sexual arousal. This fine tuning of female reproduction involves both the estradiol feedback as an indicator of oocyte maturation, and the master circadian clock of the suprachiasmatic nuclei (SCN) as an indicator of the time of the day. Herein, we are providing an overview of the state of knowledge regarding the differential inhibitory and stimulatory effects of estradiol at different stages of the reproductive axis, and the mechanisms through which the two main neurotransmitters of the SCN, arginine vasopressin, and vasoactive intestinal peptide, convey daily time cues to the reproductive axis. In addition, we will report the most recent findings on the putative functions of peripheral clocks located throughout the reproductive axis [kisspeptin (Kp) neurons, gonadotropin-releasing hormone neurons, gonadotropic cells, the ovary, and the uterus]. This review will point to the critical position of the Kp neurons of the anteroventral periventricular nucleus, which integrate both the stimulatory estradiol signal, and the daily arginine vasopressinergic signal, while displaying a circadian clock. Finally, given the critical role of the light/dark cycle in the synchronization of female reproduction, we will discuss the impact of circadian disruptions observed during shift-work conditions on female reproductive performance and fertility in both animal model and humans.
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Affiliation(s)
- Valérie Simonneaux
- Institut des Neurosciences Cellulaires et Intégratives, CNRS (UPR 3212), Strasbourg, France
- *Correspondence: Valérie Simonneaux, Institut des Neurosciences Cellulaires et Intégratives, CNRS (UPR 3212), 5 rue Blaise Pascal, Strasbourg 67084, France,
| | - Thibault Bahougne
- Institut des Neurosciences Cellulaires et Intégratives, CNRS (UPR 3212), Strasbourg, France
- Service d’Endocrinologie et Diabète, Hôpital Civil, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
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16
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Gamble KL, Resuehr D, Johnson CH. Shift work and circadian dysregulation of reproduction. Front Endocrinol (Lausanne) 2013; 4:92. [PMID: 23966978 PMCID: PMC3736045 DOI: 10.3389/fendo.2013.00092] [Citation(s) in RCA: 96] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/02/2013] [Accepted: 07/10/2013] [Indexed: 01/18/2023] Open
Abstract
Health impairments, including reproductive issues, are associated with working nights or rotating shifts. For example, shift work has been associated with an increased risk of irregular menstrual cycles, endometriosis, infertility, miscarriage, low birth weight or pre-term delivery, and reduced incidence of breastfeeding. Based on what is known about circadian regulation of endocrine rhythms in rodents (and much less in humans), the circadian clock is an integral regulatory part of the reproductive system. When this 24-h program is disordered by environmental perturbation (such as shift work) or genetic alterations, the endocrine system can be impaired. The purpose of this review is to explore the hypothesis that misalignment of reproductive hormones with the environmental light-dark cycle and/or sleep-wake rhythms can disrupt menstrual cycles, pregnancy, and parturition. We highlight the role of the circadian clock in regulating human reproductive physiology and shift work-induced pathology within each step of the reproductive axis while exploring potential mechanisms from the animal model literature. In addition to documenting the reproductive hazards of shift work, we also point out important gaps in our knowledge as critical areas for future investigation. For example, future studies should examine whether forced desynchronization disrupts gonadotropin secretion rhythms and whether there are sleep/wake schedules that are better or worse for the adaptation of the reproductive system to shift work. These studies are necessary in order to define not only whether or not shift work-induced circadian misalignment impairs reproductive capacity, but also to identify strategies for the future that can minimize this desynchronization.
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Affiliation(s)
- Karen L. Gamble
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, Birmingham, AL, USA
| | - David Resuehr
- Department of Cell and Developmental and Integrative Biology, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Carl Hirschie Johnson
- Department of Biological Sciences, Vanderbilt University, Nashville, TN, USA
- *Correspondence: Carl Hirschie Johnson, Department of Biological Sciences, Vanderbilt University, 465 21st Avenue South, Nashville, TN 37235, USA e-mail:
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