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Rotating Shift Work and Menstrual Cycle Characteristics.
MedLine Citation:
PMID:  21364464     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
BACKGROUND:: Shift workers who experience sleep disturbances and exposure to light at night could be at increased risk for alterations in physiologic functions that are circadian in nature. METHODS:: We investigated rotating shift work and menstrual cycle patterns in the Nurses' Health Study II using cross-sectional data collected in 1993 from 71,077 nurses aged 28-45 years who were having menstrual periods and were not using oral contraceptives. Log-binomial regression was used to estimate relative risks (RRs) and 95% confidence intervals (CIs). RESULTS:: Eight percent of participants reported working rotating night shifts for 1-9 months, 4% for 10-19 months, and 7% for 20+ months during the previous 2 years. Irregular cycles (>7 days variability) were reported by 10% of participants. Seventy percent of women reported menstrual cycles of 26-31 days, 1% less than 21 days, 16% 21-25 days, 11% 32-39 days, and 1% 40+ days. Women with 20+ months of rotating shift work were more likely to have irregular cycles (adjusted RR = 1.23 [CI = 1.14-1.33]); they were also more likely to have cycle length <21 days (1.27 [0.99-1.62]) or 40+ days (1.49 [1.19-1.87]) (both compared with 26-31 days). For irregular patterns and for 40+ day cycles, there was evidence of a dose response with increasing months of rotating shift work. Moderately short (21-25 days) or long (32-39 days) cycle lengths were not associated with rotating shift work. CONCLUSIONS:: Shift work was modestly associated with menstrual function, with possible implications for fertility and other cycle-related aspects of women's health.
Authors:
Christina C Lawson; Elizabeth A Whelan; Eileen N Lividoti Hibert; Donna Spiegelman; Eva S Schernhammer; Janet W Rich-Edwards
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-2-28
Journal Detail:
Title:  Epidemiology (Cambridge, Mass.)     Volume:  -     ISSN:  1531-5487     ISO Abbreviation:  -     Publication Date:  2011 Feb 
Date Detail:
Created Date:  2011-3-2     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9009644     Medline TA:  Epidemiology     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
From the aNational Institute for Occupational Safety and Health, Centers for Disease Control and Prevention, Cincinnati, OH; bChanning Laboratory, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA; Departments of cEpidemiology and dBiostatistics, Harvard School of Public Health, Boston, MA; and eConnors Center for Women's Health and Gender Biology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA.
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