Chronobiological research is a real treasure, given our ignorance of their own biorhythms.At the time of the study of circadian 24-hour, 90-minutnyhultradiannyh, monthly infradiadnyh and other biological rhythms are carried out in many areas.They studied allergists, veterinarians, cardiologists, microbiologists, endocrinologists, ecologists, epidemiologists, gastroenterologists, immunologists, neurologists, obstetricians, gynecologists, psychiatrists and toxicologists.
There is an assumption that our response to seasonal changes in the length of daylight before the industrial revolution was stronger, and then it was suppressed by the change in our physical environment.Some believe that the response to seasonal changes in light can reduce the use of artificial light at night.
But more extensive studies of human cycles show that this is not true.Many common illnesses still follow a strict seasonal schedule.They often occur because of our inability to adapt to sudden changes in the weather, but can also
As our body reacts
Human behavior, as can be seen from the data on the frequency of conception, fertility, mortality, suicide, etc., are also going through a cycle with the seasons.Even there is a seasonal pattern to mood swings.
individual human biochemistry and physiology studies may not cover all of the many seasonal changes in our body.The change in our blood parameters depending on the time of year.Its volume is increased in summer and winter decreases.One study conducted in the UK showed that most high blood pressure is observed in April and May, the lowest in September.In other studies, it was found that the metabolism rate higher winter and summer below.Often there are seasonal fluctuations in body weight.
When the temperature falls, the incidence of coronary and cerebral thrombosis within the first day begins to decline.Our normal physiological response to cold includes rapid change many parameters of blood, including a decrease of its total volume (which results in deterioration of the supply organs and tissue oxygenation), increased fibrinogen (factor displace blood), increasing its viscosity and cholesterol (which favors atherosclerosis).Such changes may have on the already weakened heart is an additional burden.This would explain the fact that the largest number of coronary events (angina, heart attacks) occur in autumn and winter, and the peak seasonal diseases - in January and February.
Certain forms of cancer also have some connection with the seasons.There are seasonal variations in the diagnosis of viral warts and cervical cancer.The largest number of cases of detection of cervical cancers occur in February.
reaction of our immune system also varies throughout the year.Most people in August and December, there has been increasing circulating leukocytes (cell-killing infection), which displays immunity to infection to the maximum.In April and October, low levels of so-called cell-killing infection, which lowers our immunity.