Studies have found that people who need to rest during working hours are prone to cardiovascular disease
A new study published at the online conference of the European Society of Cardiology “Preventive Heart Disease 2021” shows that night work or “atypical” time increases the risk of cardiovascular health.
Dr. Sara Gamboa Madeira, a research author from the University of Lisbon in Portugal, said: “Our research has found that every hour of work that is not synchronized with the employee’s biological clock increases the risk of heart disease. .
This research focuses on the role of circadian rhythm disorders, which is the difference between the “social clock” (such as working hours) and the individual “biological clock”.
The author of the study explained: “We all have an internal biological clock, ranging from the morning type (larks) (waking and sleepy in the morning, sleepy at night) to the late type (owls). For For anyone, the situation is just the opposite.
Circadian rhythm disorders occur when there is a mismatch between what your body wants (for example, falling asleep at 10pm) and your social obligations imposed on you (for example, working until midnight).
The study included 301 manual workers from a retail company in Portugal. The staff has three shifts: 6:00 am to 3:00 pm; from 3:00 PM to midnight; the evening starts at 9:00 PM. Participants completed a questionnaire about sociodemographic factors (age, gender, education level).
The Munich ChronoType questionnaire is used to assess sleep time and assess each person’s internal biological clock (also called a chronograph). The DevDiscourse portal, which publishes the research, says it is also used to quantify the number of circadian rhythm disorders (i.e. the mismatch between an individual’s biological clock and working hours), that is, social jet lag.
According to the hours of social jet lag, participants were divided into three groups: under 2 hours, 2-4 hours, and over 4 hours. The researchers used the European Relative Risk SCORE table, which includes smoking, blood pressure and cholesterol, to calculate the relative cardiovascular risk.
The relative risk ranges from 1 (non-smokers with healthy blood pressure and cholesterol) to 12 (smokers with very high blood pressure and cholesterol). In this study, a relative risk of 3 or higher was considered “high cardiovascular risk.” Then, the researchers studied the relationship between social jet lag and high cardiovascular risk.
The average age of the participants was 33 years old and 56% of men. Slightly more than half (51%) of smokers, 49% of patients with high cholesterol, and 10% of patients with hypertension. One in five (20%) is classified as having a high cardiovascular risk. About 40% of people rarely sleep during the working day (6 hours or less). The average social jet lag is nearly 2 hours.
In most workers (59%), the social jet lag is 2 hours or less, while 33% have 2 to 4 hours, and 8% have 4 hours or more. Higher social jet lag was significantly correlated with higher likelihood in the high cardiovascular risk group.