News | Shift Work May Delay Natural Menopause, Study Suggests a Role for Circadian Rhythms
Nontraditional shift schedules are known to significantly disrupt lifestyles and sleep habits and have long been associated with adverse health effects. A new study published in Menopause further suggests that shift work may delay natural menopause in women, potentially through disruption of circadian rhythms.
The study was supported and published by The North American Menopause Society (NAMS). It found that women currently engaged in shift work may experience natural menopause later, especially those whose shifts rotate frequently. The finding highlights a new area of concern in women's health and offers important clues about the potential relationship between work schedules and reproductive health.
Shift Work and Health Risks: New Findings on a Longstanding Issue
The proportion of people working shifts has continued to rise worldwide in recent years. In North America and Europe, about 20% of the workforce follows some form of nontraditional or rotating schedule. Although these schedules have become an "economic necessity" to meet growing demand for goods and services, their health risks cannot be overlooked. Earlier studies have shown that night work significantly increases the risk of coronary heart disease, peptic ulcers, type 2 diabetes, and several cancers, including prostate, colorectal, and breast cancer.
However, past research on the health effects of shift work has focused mainly on younger and middle-aged adults. By comparison, its effects on physiological changes in older women—especially the timing of natural menopause—have received little in-depth study. The age at natural menopause is considered a key indicator of health in older women, and menopause that occurs too early or too late may be associated with higher disease and mortality risks.
Circadian Disruption: Could a Disturbed Body Clock Be the Key Mechanism?
This study used a secondary analysis of data from the Canadian Longitudinal Study on Aging (CLSA), including nearly 3,700 premenopausal women, to examine the association between shift work and age at natural menopause. The researchers found that women currently working rotating shifts reached natural menopause significantly later than other women. Women working night shifts, however, showed a tendency toward earlier menopause.
The researchers suggest that shift-related circadian disruption may explain these findings. Scientific evidence indicates that long-term exposure to bright artificial light during dark hours suppresses melatonin secretion and may disrupt ovarian activity. Changes in circadian rhythms may also affect hormonal regulation by the hypothalamus, indirectly interfering with ovulation and fertility.
Further Research Needed on the Health Costs of Work Schedules
Although the study suggests that shift work may affect the timing of menopause, the researchers noted that it remains unclear whether this effect is caused by circadian changes or by socioeconomic factors associated with shift work, such as chronic stress, financial instability, and substance misuse. NAMS Medical Director Dr. Stephanie Faubion said, "This study highlights the potential effect of circadian regulation on the timing of menopause, but the specific mechanisms require further investigation."
The study, titled "The association between shift work exposure and the variations in age at natural menopause among adult Canadian workers: results from the Canadian Longitudinal Study on Aging (CLSA)", has been published online in Menopause.
News | Shift Work May Delay Natural Menopause, Study Highlights Possible Circadian Effects
News | Shift Work May Delay Natural Menopause, Study Suggests a Role for Circadian Rhythms
Nontraditional shift schedules are known to significantly disrupt lifestyles and sleep habits and have long been associated with adverse health effects. A new study published in Menopause further suggests that shift work may delay natural menopause in women, potentially through disruption of circadian rhythms.
The study was supported and published by The North American Menopause Society (NAMS). It found that women currently engaged in shift work may experience natural menopause later, especially those whose shifts rotate frequently. The finding highlights a new area of concern in women's health and offers important clues about the potential relationship between work schedules and reproductive health.
Shift Work and Health Risks: New Findings on a Longstanding Issue
The proportion of people working shifts has continued to rise worldwide in recent years. In North America and Europe, about 20% of the workforce follows some form of nontraditional or rotating schedule. Although these schedules have become an "economic necessity" to meet growing demand for goods and services, their health risks cannot be overlooked. Earlier studies have shown that night work significantly increases the risk of coronary heart disease, peptic ulcers, type 2 diabetes, and several cancers, including prostate, colorectal, and breast cancer.
However, past research on the health effects of shift work has focused mainly on younger and middle-aged adults. By comparison, its effects on physiological changes in older women—especially the timing of natural menopause—have received little in-depth study. The age at natural menopause is considered a key indicator of health in older women, and menopause that occurs too early or too late may be associated with higher disease and mortality risks.
Circadian Disruption: Could a Disturbed Body Clock Be the Key Mechanism?
This study used a secondary analysis of data from the Canadian Longitudinal Study on Aging (CLSA), including nearly 3,700 premenopausal women, to examine the association between shift work and age at natural menopause. The researchers found that women currently working rotating shifts reached natural menopause significantly later than other women. Women working night shifts, however, showed a tendency toward earlier menopause.
The researchers suggest that shift-related circadian disruption may explain these findings. Scientific evidence indicates that long-term exposure to bright artificial light during dark hours suppresses melatonin secretion and may disrupt ovarian activity. Changes in circadian rhythms may also affect hormonal regulation by the hypothalamus, indirectly interfering with ovulation and fertility.
Further Research Needed on the Health Costs of Work Schedules
Although the study suggests that shift work may affect the timing of menopause, the researchers noted that it remains unclear whether this effect is caused by circadian changes or by socioeconomic factors associated with shift work, such as chronic stress, financial instability, and substance misuse. NAMS Medical Director Dr. Stephanie Faubion said, "This study highlights the potential effect of circadian regulation on the timing of menopause, but the specific mechanisms require further investigation."
The study, titled "The association between shift work exposure and the variations in age at natural menopause among adult Canadian workers: results from the Canadian Longitudinal Study on Aging (CLSA)", has been published online in Menopause.
Source:
Compiled from online sources