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The noise of the aircraft's lifting, the sound of a motorcycle whistling, or the sound of a companion sleeping and snoring can cause intermittent sleep and nervousness. Is it not aware of the existence of noise, and the noise has no effect on you? Not also. A recent study shows that even if you manage to sleep in the noisy night, your body still records the noise you are experiencing in a subconscious state and expresses it in a way that rises in blood pressure. The study used four major European airports with night flights - London Airport in the UK, Athens Airport in Greece, Stockholm Airport in Sweden and Milan Airport in Italy. The volunteers from the airport were invited to participate in the study. The results of this research are published in the latest issue of the European Heart Journal. The participants in the study were equipped with a dynamic blood pressure monitor that the researchers used to observe changes in blood pressure during sleep at intervals of 15 minutes during the study. The subject's room is also equipped with an MP3 recorder and noise meter to record the volume and duration of noise in the surrounding environment. Researchers believe that when noise from road traffic, aircraft movements or companion snoring exceeds 35 decibels, then a "noise event" will occur and the residents' blood pressure will suddenly rise. 35 decibels is not a very high threshold. Think about it. The whisper of a person who is 3 feet away is 30 decibels, the hum of a refrigerator is 40 decibels, and the loud voice is 60 to 70 decibels. The noise level measured in the bedroom of the study fluctuated between 30 and 40 decibels and between 80 and 90 decibels, equivalent to the volume of the food blender. The researchers found that people's blood pressure rises with a noise, and even this noise is not enough to wake people who are sleeping. Regardless of where the sound comes from – from the runway of the airport or to the other side of the bed, the human blood pressure responds consistently. For example, aircraft noise can cause an average of 6.2 mm Hg systolic blood pressure (SBP, the highest blood pressure during systole), and 7.4 mm Hg diastolic blood pressure (Diastolic Blood Pressure, DBP, diastolic time) The increase in blood pressure is lowest. The noise emitted by snoring companions and transportation has a similar effect, and the effect is related to the volume and depends on the volume. The louder the noise, the higher the blood pressure. For every 5 decibels of aircraft noise, systolic and diastolic blood pressures increased by 0.65 mm Hg. Dr. Lars Jarup, an environmental and occupational medical researcher at Imperial College London, said: "It is clear that the rise in blood pressure is small, but it has a different meaning." The new report is the inevitable result of a larger study by the same research team. The study examined the relationship between high blood pressure and nighttime aircraft noise and the disturbance of traffic noise during the day. The study, published online in the December issue of Environmental Health Perspectives, involved 4,861 participants aged between 45 and 70, living at least five in the vicinity of a major European airport. More than a year. According to the study, residents who live near the airport for a long time are susceptible to flight noise during sleep. If the noise exceeds 35 decibels, the blood pressure will rise rapidly, which will endanger health for a long time and the risk of high blood pressure is high. Researchers have found that nighttime airport noise carries the risk of directly causing an increase in high blood pressure. For every 10 decibels of nighttime aircraft noise, the risk of developing high blood pressure in humans increases by 14%. In addition, the study found that road traffic noise that humans are exposed to every day - calculated at an average of more than 65 decibels - causes more than 50% of the risk of high blood pressure. But the strange thing is that this phenomenon only occurs between men and not between women. The new study, which included 140 normal-blooded middle-aged volunteers, sought to discover the relationship between noise and hypertension risk. Researchers' understanding of this relationship is still not comprehensive and is not in place. The short-term effects of loud noise during sleep have been confirmed in the laboratory, but under normal circumstances, they have not been confirmed in the lives of ordinary people. Jarup said: "The nighttime blood pressure changes during the short period can be justified, but if you live near the airport for a long time, the noise will have a long-term effect on blood pressure changes. But we still can't understand this principle." Why the human body reacts to nighttime noise is also a bit mysterious. This research specifically for humans is brand new, and Jarup said: "It’s not because you are annoyed when you are troubled by noise, it causes blood pressure to rise, but there is a mechanism in the human brain that we don’t understand yet. Causes an increase in blood pressure. This mechanism may be a stress response in the subconscious." According to the World Health Organization standards, in the absence of antihypertensive drugs, systolic blood pressure greater than or equal to 140 mm Hg or diastolic blood pressure greater than or equal to 90 mm Hg for high blood pressure. High blood pressure is easy to induce stroke and heart attack. Factors such as nocturnal noise are not the deciding factor in high blood pressure, unlike the factors that cause high blood pressure, such as weight gain, lack of exercise, and alcohol abuse. However, Jarup believes that their research aims to reduce the risk factors for high blood pressure in humans - the fewer the factors, the better. ——Midi Medical Network