Women do not synchronize their menstrual cycles

Abstract

It is widely believed that women who live together or who are close friends synchronize their menstrual cycles. We reexamined this phenomenon in two ways. First, we collected data on menstrual cycles from 186 Chinese women living in dorms for over a year. We found that women living in groups did not synchronize their cycles. Second, we reviewed the first study reporting menstrual synchrony. We found that group synchrony in that study was at the level of chance. We then show that cycle variability produces convergences and subsequent divergences of cycle onsets and may explain perceptions of synchrony.

References

  1. Arden, M. A., and L. Dye 1998 The Assessment of Menstrual Synchrony: Comment on Weller and Weller (1997). Journal of Comparative Psychology 112:323–324.

    Article  Google Scholar 

  2. Arden, M. A., L. Dye, and A. Walker 1999 Menstrual Synchrony: Awareness and Subjective Experiences. Journal of Reproductive and Infant Psychology 17:255–265.

    Google Scholar 

  3. Burley, N. 1979 The Evolution of Concealed Ovulation. American Naturalist 114:835–858.

    Article  Google Scholar 

  4. Calhoun, J. 1962 The Ecology and Sociology of the Norway Rat. Bethesda, MD: U.S. Department of Health, Education and Welfare.

    Google Scholar 

  5. Cepicky, P., F. Mandys, L. Hlavicka, and K. Sosnova 1996 Absence of Menstrual Cycle Synchronization in Mentally Affected Women Living in a Social Welfare Institute. Homeostasis in Health and Disease 37:249–252.

    Google Scholar 

  6. French, J. A., and J. A. Stribley 1985 Synchronization of Ovarian Cycles within and between Social Groups in Golden Lion Tamarins (Leontopithecus rosalia). American Journal of Primatology 12:469–478.

    Article  Google Scholar 

  7. Gattermann, R. K. Ulbrich, and R. Weinandy 2002 Asynchrony in the Estrous Cycles of Golden Hamsters (Mesocricetus auratus). Hormones and Behavior 42:70–77.

    Article  Google Scholar 

  8. Goldman, S. E., and H. G. Schneider 1987 Menstrual Synchrony: Social and Personality Factors. Journal of Social Behavior and Personality 2:243–250.

    Google Scholar 

  9. Graham, C. A., and W. D. McGrew 1980 Menstrual Synchrony in Female Undergraduates Living on a Coeducational Campus. Psychoneuroendocrinology 5:245–252.

    Article  Google Scholar 

  10. 1992 Social Factors and Menstrual Synchrony in a Population of Nurses. In Menstrual Healthin Women’s Lives, A. J. Dan and L. L. Lewis, eds. Pp. 246–253. Chicago: University of Illinois Press.

    Google Scholar 

  11. Handelmann, G., R. Ravizza, and W. J. Ray 1980 Social Dominance Determines Estrous Entrainment among Female Hamsters. Hormones and Behavior 14:107–115.

    Article  Google Scholar 

  12. Harlow, S. D., X. Lin, and M. J. Ho 2000 Analysis of Menstrual Diary Data across the Reproductive Life Span: Applicability of the Bipartite Model Approach and the Importance of Within-Woman Variance. Journal of Clinical Epidemiology 53:722–733.

    Article  Google Scholar 

  13. Jarett, L. R. 1984 Psychological and Biological Influences on Menstruation: Synchrony, Cycle Length, and Regularity. Psychoneuroendocrinology 9:21–28.

    Article  Google Scholar 

  14. Kiltie, R. A. 1982 On the Significance of Menstrual Synchrony in Closely Associated Women. American Naturalist 119:414–419.

    Article  Google Scholar 

  15. Kohl J. V., M. Atzmueller, B. Fink, and K. Grammer 2001 Human Pheromones: Integrating Neuroendocrinology and Ethology. Neuroendocrinology Letters 22:309–321.

    Google Scholar 

  16. Little, B. B., D. S. Guzick, R. M. Malina, and M. D. Rocha Ferreira 1989 Environmental Influences Cause Menstrual Synchrony, Not Pheromones. American Journal of Human Biology 1:53–57.

    Article  Google Scholar 

  17. Matteo, S. 1987 The Effect of Job Stress and Job Interdependency on Menstrual Cycle Length, Regularity and Synchrony. Psychoneuroendocrinology 12:467–476.

    Article  Google Scholar 

  18. McClintock, M. K. 1971 Menstrual Synchrony and Suppression. Nature 229:244–245.

    Article  Google Scholar 

  19. 1978 Estrous Synchrony and its Mediation by Airborne Chemical Communication (Rattus norvegicus). Hormones and Behavior 10:264–276.

    Article  Google Scholar 

  20. Monfort, S. L., M. Bush, and D. E. Wildt 1996 Natural and Induced Ovarian Synchrony in Golden Lion Tamarins (Leontopithecus rosalia). Biology of Reproduction 55:875–882.

    Article  Google Scholar 

  21. Page, E. B. 1964 Ordered Hypotheses for Multiple Treatments: A Significance Test for Linear Ranks. Journal of the American Statistical Association 58:216–230.

    Article  Google Scholar 

  22. Quadagno, D. M., H. E. Shubeita, J. Deck, and D. Francoer 1981 The Effects of Males, Athletic Activities and All Female Living Conditions on the Menstrual Cycle. Psychoneuroendocrinology 6:239–244.

    Article  Google Scholar 

  23. Schank, J. C. 1997 Problems with Dimensionless Measurement Models of Synchrony in Biological Systems. American Journal of Primatology 41:65–85.

    Article  Google Scholar 

  24. 2000a Can Pseudo Entrainment Explain the Synchrony of Estrous Cycles among Golden Hamsters (Mesocricetus auratus?) Hormones and Behavior 38:94–101.

    Article  Google Scholar 

  25. 2000b Menstrual-Cycle Variability and Measurement: Further Cause for Doubt. Psychoneuroendocrinology 25:837–847.

    Article  Google Scholar 

  26. 2001a Do Norway Rats (Rattus norvegicus) Synchronize Their Estrous Cycles? Psyciology and Behavior 72:129–139.

    Article  Google Scholar 

  27. 2001b Menstrual-Cycle Synchrony: Problems and New Directions for Research. Journal of Comparative Psychology 115:3–15.

    Article  Google Scholar 

  28. 2001c Oestrous and Birth Synchrony in Norway Rats, Rattus norvegicus. Animal Behaviour 62:409–415.

    Article  Google Scholar 

  29. 2001d Measurement and Cycle Variability: Reexamining the Case for Ovarian-Cycle Synchrony in Primates. Behavioral Processes 56:131–146.

    Article  Google Scholar 

  30. 2002 A Multitude of Errors in Menstrual-Synchrony Research: Replies to Weller and Weller (2002) and Graham (2002). Journal of Comparative Psychology 116:319–322.

    Article  Google Scholar 

  31. 2004 Avoiding Synchrony as a Strategy of Female Mate Choice. Nonlinear Dynamics, Psychology, and Life Sciences 8:147–176.

    Google Scholar 

  32. Skandhan, K. P., A. K. Pandya, S. Skandhan, and Y. B. Mehta 1979 Synchronization of menstruation among intimates and kindreds. Panminerva Medica 21:131–134.

    Google Scholar 

  33. Stephens, M. A. 1965 The Goodness-of-fit Statistic VN: Distribution and Significance Points. Biometrika 52:309–321.

    Google Scholar 

  34. Stern, K., and M. K. McClintock 1998 Regulation of Ovulation by Human Pheromones. Nature 392:177–178.

    Article  Google Scholar 

  35. Strassmann, B. L. 1997 The Biology of Menstruation in Homo sapiens: Total Lifetime Menses, Fecundity, and Nonsynchrony in a Natural Fertility Population. Current Anthropology 38:123–129.

    Article  Google Scholar 

  36. 1999 Menstrual Synchrony Pheromones: Cause for Doubt. Human Reproduction 14:579–580.

    Article  Google Scholar 

  37. Trevathan, W. R., M. H. Burleson, and W. L. Gregory 1993 No Evidence for Menstrual Synchrony in Lesbian Couples. Psychoneuroendocrinology 18:425–435.

    Article  Google Scholar 

  38. Turke, P. W. 1984 Effects of Ovulatory Concealment and Synchrony on Protohominid Mating Systems and Parental Roles. Ethology and Sociobiology 5:33–44.

    Article  Google Scholar 

  39. Wallis, J. 1985 Synchrony of Estrous Swelling in Captive Group-Living Chimpanzees (Pan troglodytes). International Journal of Primatology 6:335–350.

    Article  Google Scholar 

  40. Weller, A., and L. Weller 1992 Menstrual Synchrony in Female Couples. Psychoneuroendocrinology 17:171–177.

    Article  Google Scholar 

  41. 1993 Menstrual Synchrony between Mothers and Daughters and between Roommates. Physiology and Behavior 53:943–949.

    Article  Google Scholar 

  42. 1995a The Impact of Social Interaction Factors on Menstrual Synchrony in the Workplace. Psychoneuroendocrinology 20:21–31.

    Article  Google Scholar 

  43. 1995b Examination of Menstrual Synchrony among Women Basketball Players. Psychoneuroendocrinology 20:613–622.

    Article  Google Scholar 

  44. 1997 Menstrual Synchrony under Optimal Conditions: Bedouin Families. Journal of Comparative Psychology 111:143–151.

    Article  Google Scholar 

  45. 1998 Prolonged and Very Intensive Contact May Not Be Conducive to Menstrual Synchrony. Psychoneuroendocrinology 23:19–32.

    Article  Google Scholar 

  46. Weller, L., and A. Weller 1993 Multiple Influences of Menstrual Synchrony: Kibbutz Roommates, Their Best Friends, and Their Mothers. American Journal of Human Biology 5:173–179.

    Article  Google Scholar 

  47. 1998 Menstrual Variability and the Measurement of Menstrual Synchrony. Psychoneuroendocrinology 23:19–32.

    Article  Google Scholar 

  48. Weller, L., A. Weller, and S. Roizman 1999 Human Menstrual Synchrony in Families and among Close Friends: Examining the Importance of Mutual Exposure. Journal of Comparative Psychology 113:261–268.

    Article  Google Scholar 

  49. Weller, L., A. Weller, H. Koresh-Kamin, and R. Ben-Shoshan 1999 Menstrual Synchrony in a Sample of Working Women. Psychoneuroendocrinology 24:449–459.

    Article  Google Scholar 

  50. Whitten, W. 1999 Reproductive Biology: Pheromones and Regulation of Ovulation. Nature 401:232–233.

    Article  Google Scholar 

  51. Wilson, H. C. 1987 Female Axillary Secretions Influence Women’s Menstrual Cycles: A Critique. Hormones and Behavior 21:536–550.

    Article  Google Scholar 

  52. 1988 Male Axillary Secretions Influence Women’s Menstrual Cycles: A Critique. Hormones and Behavior 21:266–77.

    Article  Google Scholar 

  53. 1992 A Critical Review of Menstrual Synchrony Research. Psychoneuroendocrinology 17:565–591.

    Article  Google Scholar 

  54. Wilson, H. C., S. H. Kiefhaber, and V. Gravel 1991 Two Studies of Menstrual Synchrony: Negative Results. Psychoneuroendocrinology 16:353–359.

    Article  Google Scholar 

  55. Winfree, A. T. 1980 The Geometry of Biological Time. Berlin: Springer-Verlag.

    Google Scholar 

  56. Winman, A. 2004 Do Perfume Additives Termed Human Pheromones Warrant Being Termed Pheromones? Physiology and Behavior 82:697–701.

    Article  Google Scholar 

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Correspondence to Jeffrey C. Schank.

Additional information

This study was supported by the Sichuan Youth Foundation of Science and Technology (Chuan Ke Ji [2001] 2) and NIH Grant No. 5R01MH065555-02. We thank Shuhuan Yang, Xia Xu, Jun Qu, Jing Zhu, Meijia Yu, & Chang Zhou for all their work in collecting the data. Without them, this study could never have been done.

Zheng-Wei Yang is director and professor of the Morphometric Research Laboratory, North Sichuan Medical College, China. His main research interests are in spermatogenesis, morphometry, and stereology.

Jeff Schank is associate professor of psychology at the University of California, Davis. His main research interests are in computational and biorobotic modeling of group behavior and the development of sensorimotor behavior in animals.

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Yang, Z., Schank, J.C. Women do not synchronize their menstrual cycles. Hum Nat 17, 433–447 (2006). https://doi.org/10.1007/s12110-006-1005-z

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Key words

  • Estrous synchrony
  • Human pheromones
  • Menstrual cycles
  • Menstrual synchrony
  • Reproductive synchrony