Light Exposure, Melatonin Secretion, and Menstrual Cycle Parameters: An Integrative Review

Barron, Mary Lee

doi:10.1177/1099800407303337

Cited by 43 publications

(30 citation statements)

References 63 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Unfortunately, there have been no investigations regarding melatonin and DDH. However, the marked differences in seasonal variation between these different studies may help explain the variability seen in this study, since melatonin levels are also involved with reproductive/sex hormone levels [133, 134]. …”

Section: Discussionmentioning

confidence: 99%

Seasonal variation in children with developmental dysplasia of the hip

Loder

Shafer

2014

Journal of Children's Orthopaedics

View full text Add to dashboard Cite

BackgroundIt has been postulated that developmental dysplasia of the hip (DDH) is more frequent in infants born in the winter months. It was the purpose of this study to ascertain if there was any seasonal variation in DDH at the author’s institution and compare/contrast our results with those in the literature using rigorous mathematical fitting.MethodsAll children with DDH treated at the author’s institution from 1993 to 2012 were identified. The month of birth was recorded and temporal variation was analyzed using cosinor analysis. Similar data from the literature was analyzed.ResultsThere were 424 children (363 girls, 61 boys). An additional 22,936 children were added from the literature for a total of 23,360. Pearson’s Chi-square test demonstrated a non-uniform distribution in the month of birth for both our 424 children as well as the combined literature series in both the Northern and Southern hemispheres. Cosinor analysis of the 424 children demonstrated double peaks in mid-March and mid-October. For the entire 23,360 children, no seasonal variation was observed in 2,205 (9.4 %), a single winter peak in 16,425 (70.3 %), a single summer peak in 1,280 (5.5 %), and double peaks in the spring and autumn in 3,450 (14.8 %).ConclusionsThis study partly supports the hypothesis of tight clothing/cold temperature as one factor in the etiology of DDH with the tighter clothing/swaddling increasing the risk of DDH. However ~20 % of the DDH births demonstrated a non-winter peak. The single summer and double spring/autumn peaks, as well as in those series where no seasonal variation was noted, refutes the cold winter clothing hypothesis. Perhaps these different patterns in seasonal variation represent the heterogeneity of the genetic factors in DDH interacting with external factors (temperature and clothing) and internal factors (metabolic). Further study will be required to understand these different patterns in DDH seasonal variation.Level of evidenceIV—case series.

show abstract

Section: Discussionmentioning

confidence: 99%

Seasonal variation in children with developmental dysplasia of the hip

Loder

Shafer

2014

Journal of Children's Orthopaedics

View full text Add to dashboard Cite

show abstract

“…2,20 In humans, however, a relation between hours or intensity of light exposure and menstrual cycle parameters, such as cycle length, remains unclear. 20,21 Moreover, while urinary melatonin metabolite levels have been associated with shift work, parity, and amenorrhea, [22][23][24][25][26][27][28] an association between melatonin and reproductive hormones has not been established in humans. 19 In one study, plasma melatonin levels remained consistent throughout the menstrual cycle, though melatonin levels were nearly twice as high in amenorrheic women as controls.…”

Section: Discussionmentioning

confidence: 99%

Rotating Shift Work and Menstrual Cycle Characteristics

Lawson

Whelan²,

Hibert³

et al. 2011

Epidemiology

123

122

View full text Add to dashboard Cite

show abstract

“…They had a regular working schedule (at least four working days per week), had not performed shift work during the past 5 years, and had not travelled across more than two time zones during the month prior to the study. Females were selected only if they were premenopausal and made use of hormonal contraceptives (to avoid possible fluctuations in melatonin levels dependent on the phase of the menstrual cycle; Lee Barron, ).…”

Section: Methodsmentioning

confidence: 99%

Strategies to decrease social jetlag: Reducing evening blue light advances sleep and melatonin

Zerbini

Kantermann

Merrow

2018

Eur J of Neuroscience

View full text Add to dashboard Cite

The timing of sleep is under the control of the circadian clock, which uses light to entrain to the external light‐dark cycle. A combination of genetic, physiological and environmental factors produces individual differences in chronotype (entrained phase as manifest in sleep timing). A mismatch between circadian and societal (e.g., work) clocks leads to a condition called social jetlag, which is characterized by changing sleep times over work and free days and accumulation of sleep debt. Social jetlag, which is prevalent in late chronotypes, has been related to several health issues. One way to reduce social jetlag would be to advance the circadian clock via modifications of the light environment. We thus performed two intervention field studies to describe methods for decreasing social jetlag. One study decreased evening light exposure (via blue‐light‐blocking glasses) and the other used increased morning light (via the use of curtains). We measured behaviour as well as melatonin; the latter in order to validate that behaviour was consistent with this neuroendocrinological phase marker of the circadian clock. We found that a decrease in evening blue light exposure led to an advance in melatonin and sleep onset on workdays. Increased morning light exposure advanced neither melatonin secretion nor sleep timing. Neither protocol led to a significant change in social jetlag. Despite this, our findings show that controlling light exposure at home can be effective in advancing melatonin secretion and sleep, thereby helping late chronotypes to better cope with early social schedules.

show abstract

Light Exposure, Melatonin Secretion, and Menstrual Cycle Parameters: An Integrative Review

Cited by 43 publications

References 63 publications

Seasonal variation in children with developmental dysplasia of the hip

Seasonal variation in children with developmental dysplasia of the hip

Rotating Shift Work and Menstrual Cycle Characteristics

Strategies to decrease social jetlag: Reducing evening blue light advances sleep and melatonin

Contact Info

Product

Resources

About