Night light alters menstrual cycles

Lin, May C.; Kripke, Daniel F.; Parry, Barbara L.; Berga, Sarah L.

doi:10.1016/0165-1781(90)90067-f

Cited by 39 publications

(20 citation statements)

References 13 publications

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“…35 Furthermore, long and irregular menstrual cycles can be normalized by ambient light expo sures administered at night during the days 13-17 of the menstrual cycle. 36 This original report was supported and extended by findings that the menstrual cycle was shortened in 38 patients with winter depression after the daily exposure to light for 1 week as started between the days 1 and 14 of the menstrual cycle 99 and that exposure to sunshine 2 days or 3 days before the ovulation appears to shorten the men strual cycle. 100 Moreover, among women with lengthened menstrual cycles, the ovulation was promoted, the follicle size was increased, and the circulating levels of prolactin, LH, and FSH were increased by the daily exposure to bright light for 1 week between the days 7 and 14 of the menstrual cycle.…”

supporting

confidence: 64%

“…In humans, the photoperiod and thus light exposure via the eyes have endocrine effects and to some extent take part in regulation of reproductive cycles as well. 35,36 Melatonin is known to influence reproduction by binding melatonin recep tors that are rhythmically expressed in GnRHsecreting cells and downregulating hypothalamic GnRH gene expression, 30,37 and by interacting with receptors expressed in the ovaries. 38 It is of note that melatonin is also produced in peripheral sites, including reproductive organs such as the ovaries (eg, in the granulosa cells and oocytes) and the placenta, and as such actively influencing the development of the fetal SCN.…”

Section: Toffol Et Almentioning

confidence: 99%

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Biological rhythms and fertility: the hypothalamus–pituitary–ovary axis

Toffol¹,

Heikinheimo²,

Partonen³

2016

CPT

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In addition to normal physiological processes, a number of pathological conditions exhibit diurnal and seasonal fluctuations in their incidence. These biological rhythms are genera ted by the circadian clocks that adjust their functions and adapt to the habitat. Misalignment of biological rhythms and disrupted functions of the circadian clocks may eventually have a negative impact on reproduction, which is the focus of this review. A large body of literature from animal studies has demonstrated the role of core clock genes and clockcontrolled genes in regulation of reproductive events. In contrast, only a few studies, mostly epidemiological ones, suggest that perturbations of the circadian clock functions, eg, due to shift work or jet lag, compromise human reproduction.

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supporting

confidence: 64%

Section: Toffol Et Almentioning

confidence: 99%

Biological rhythms and fertility: the hypothalamus–pituitary–ovary axis

Toffol¹,

Heikinheimo²,

Partonen³

2016

CPT

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“…For example, light has been employed (often during the daytime) to treat seasonal affective disorder, depression in women with pre-menstrual disorder (Parry and Newton 2001), to regulate menstrual cycles (Lin et al 1990), and to improve activity levels of patients with dementia (Holman 2010) by manipulating the onset of melatonin production. Less tangible is an apparent sense of wellbeing humans may instinctively feel in lit environments, even where their physical wellbeing may be unaffected or harmed, possibly a response evolved due to increased predation risk in dark areas in naturally lit environments (Packer et al 2011).…”

Section: Human Health and Wellbeingmentioning

confidence: 99%

Benefits and costs of artificial nighttime lighting of the environment

Gaston

Bennie

2015

Environ. Rev.

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Artificial lighting has transformed the outdoor nighttime environment over large areas, modifying natural cycles of light in terms of timing, wavelength, and distribution. This has had widespread benefits and costs to humankind, impacting on health and wellbeing, vehicle accidents, crime, energy consumption and carbon emissions, aesthetics, and wildlife and ecosystems. Here, we review these effects, particularly in the context of ongoing developments in the extent of artificial lighting and in the prevalent technologies being employed. The key issue that emerges is how best to maximize the benefits of artificial nighttime lighting whilst limiting the costs. To do so, three main strategies are required. First, important knowledge gaps need to be filled. Second, there is an urgent need to connect the research being conducted in different disciplines, which to date has been very disjointed. Third, it is imperative that much firmer and well-developed links are made between research, policy, and practice.Key words: accidents, aesthetics, crime, ecosystems, health, light pollution, lighting, night, sky glow, wellbeing.Résumé : L'éclairage artificiel a transformé l'environnement nocturne extérieur sur de grandes superficies, modifiant les cycles naturels de la lumière en terme de temps, de longueurs d'ondes et de distribution. Ceci s'est traduit par des coûts et bénéfices largement étendus pour l'humanité, affectant la santé et le bien-être, les accidents d'automobile, le crime, la consommation d'énergie et les émissions de carbones, l'esthétique ainsi que la faune et les écosystèmes. Les auteurs passent en revue ces effets, particulièrement dans le contexte de développement continu dans l'extension de l'éclairage artificiel et dans les technologies dominantes mises en oeuvre. La problématique clé qui en émerge consiste à savoir comment maximiser le mieux possible les bénéfices de l'éclairage nocturne artificiel tout en limitant les coûts. Pour atteindre cet objectif, trois stratégies principales s'imposent. Il faut d'abord combler des déficiences de connaissances. Deuxièmement, il existe un urgent besoin d'intégrer les travaux de recherche conduits dans diverses disciplines, lesquels ont été conduits de façon disparate jusqu'ici. Et troisièmement, il est impératif que des liens beaucoup plus solides et mieux développés se développent entre la recherche, les politiques et la pratique. [Traduit par la Redaction]

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“…Eventually, Dewan's studies were partly replicated in four controlled studies done in San Diego (Lin et al, 1990;Drennan et al, 1991;Rex et al, 1993Rex et al, , 1995. The first two replications (Lin et al, 1990;Drennan et al, 1991) showed that bedside lights on either nights 13-17 or nights 10-14 shortened cycles in women with long menstrual cycles.…”

Section: Introductionmentioning

confidence: 92%

“…The first two replications (Lin et al, 1990;Drennan et al, 1991) showed that bedside lights on either nights 13-17 or nights 10-14 shortened cycles in women with long menstrual cycles. The menstrual cycle lengths were reduced from an average of 45.7 and 44.9 days at baseline to 33.1 and 33.2 days during the cycle treated on nights 13-17 and 10-14, respectively (Kripke, 1993).…”

Section: Introductionmentioning

confidence: 94%

Menstrual Phase Response to Nocturnal Light

Putilov

Danilenko²,

Protopopova³

et al. 2002

Biological Rhythm Research

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The aims of the study were to test whether nocturnal white light can normalize menstrual cycles in oligomenorrheic women, and whether the phase of the menstrual cycle in which light is given is important for the shortening effect. Twenty-five women with long menstrual cycles (35.9-53.4 days on average) were treated for 1-3 cycles, each of which was preceded and followed by at least two untreated cycles. Treatments were 100 watt bedside lights administered for 5 consecutive nights. They centered at three different phases of the menstrual cycle: 6-7th, 14-17th or 23-25th days of the treated cycle (early, middle or late treatment, respectively). On average, the treatment cycle lengths were modestly, but significantly reduced compared to the duration of baseline cycles (more than 11%). The difference in the effects of the early, middle and late treatment was not significant. However, if middle or late treatments were administered in the latter half of the interval between the menstrual cycle onset and probable time of ovulation, reductions of the treated cycle length were substantial (more than 20%, resulting in cycles less than 33 days on average; p < 0.001). Other treatments produced only weak (up to 7%), if any, cycle reductions. Moreover, we found a strong correlation (p < 0.001) between the duration of baseline cycle and differential effect of middle treatment (compared to early or late treatment). Middle treatments reduced treated cycle duration to the normal range in the subjects with shorter mean baseline cycles (<42 days), while in the subjects with longer duration of baseline cycle the shortening effect was produced by late treatments (p = 0.005 and p = 0.001, respectively). The results support the suggestion that a bedside lamp used on nights prior to ovulation can cause reduction of long menstrual cycles.

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Night light alters menstrual cycles

Cited by 39 publications

References 13 publications

Biological rhythms and fertility: the hypothalamus–pituitary–ovary axis

Biological rhythms and fertility: the hypothalamus–pituitary–ovary axis

Benefits and costs of artificial nighttime lighting of the environment

Menstrual Phase Response to Nocturnal Light

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Night light alters menstrual cycles

Cited by 39 publications

References 13 publications

Biological rhythms and fertility: the hypothalamus&ndash;pituitary&ndash;ovary axis

Biological rhythms and fertility: the hypothalamus&ndash;pituitary&ndash;ovary axis

Benefits and costs of artificial nighttime lighting of the environment

Menstrual Phase Response to Nocturnal Light

Contact Info

Product

Resources

About

Biological rhythms and fertility: the hypothalamus–pituitary–ovary axis

Biological rhythms and fertility: the hypothalamus–pituitary–ovary axis