Night shifts connected with increased heart disease risk: says Study

Night shifts connected with increased heart disease risk: says Study


Changing night shifts may somewhat increase the risk of heart diseases in women, according to a new study.

The study, published in the US journal JAMA, revealed that women who have been working for the past 10 years or more in changing night shifts develop 15 to 18 percent increased risk of coronary heart disease (CHD), the most commonly known heart disease.

There are multiple risk factors at work for causing CHD, such as poor diet, smoking, sedentary lifestyle and your augmented body mass index. However, despite controlling these risk factors, the researchers still observed an increased CHD risk connected with the changing work shifts, said one lead author Celine Vetter, from the US Brigham and Women’s Hospital.

The researchers studied the connection between changing shift works at night and CHD, using information from the long-running Nurses’ Health Study I and II, which has tracked the working of 240,000 female nurses over a span of 24 years.

The study comprised nearly 189,000 nurses, who were working in rotating night shifts and reported working in at least three-night shifts every month besides doing morning and evening shifts.

The nurses also revealed their coronary health condition, hinting towards the fact that whether they had an angiogram which showed CHD-induced chest pain, a heart attack or cardiovascular processes like coronary artery bypass graft surgery, angioplasty or stents.

In the case of death or a self-reported heart attack, information was approved by death certificates as well as medical records to make sure that the incident was linked to CHD.

Through questionnaires date was also collected on obvious risk factors of CHD every two to four years all through the research period.

Over a span of 24 years, more than 10,000 newly developed cases of CHD took place.

Their assessment suggested that growing years of rotating night shifts were connected with “a statistically significant but small absolute increase” in CHD risk.

Besides, the researchers also discovered that recent night shifts might be most pertinent for developing the CHD risk and that increased time since stopping shift work was connected with the reduced risk of CHD.

Vetter said that their study results are in sync with other conclusions; yet, it is possible that changing work schedules might carry a different risk, and they don’t have much information on exact work timings as well as work start and end timings. However, they believe that their study results emphasize the need for further research.