A human being as well as nature can be described with periods, that is why a man is exposed to the periodic influences. Lunar cycles, winter-summer seasons and day-night changing are considered to be external influence's factors. On the other hand the "biological clock" determines a person's life. In the East the biorhythms had been known long before 3000 years ago. The famous Book Of Changes which predicts the future and gives advice for any occasion was written on its basis.
The first studies of biorhythms were made in Berlin in the 19th century. Nowadays the biorhythmic theory can explain the reasons of being in good or bad state without the apparent cause; being tired when a person is fit for nothing; feeling surge of strength to do one's best. The theory makes it possible to know for sure when a person can get the best of it in business, sport, education and even in private life. Biorhythms are also widely used to prevent accidents, to control the person's state of health and to predict the possibility of partners' compatibility.
Each of these biorhythms starts at the time of birth. Cycle is divided into active phase (above zero level) and passive one (below zero). The day of changing phase, when one or more rhythms are changing from active to passive phase and vice versa is a critical day. The "critical day" means that the associated abilities are unstable, and it is wise to be really careful during that day.
For example, as night turns into day, vital body functions, including heart rate and blood pressure, speed up in anticipation of increased physical activity. These and other predictable fluctuations in body function, taking place during specific time cycles, are our biologic rhythms. They are regulated by "biologic clock" mechanisms located in the brain.
Although biologic rhythms can be "reprogrammed" by environmental influences (such as when a person regularly works the night shift and sleeps during the day), they are genetically "hard-wired" into our cells, tissues, and organs.
Medical chronobiologists have found that biologic rhythms can affect the severity of disease symptoms, diagnostic test results, and even the body's response to drug therapy. Now these investigators are working to discover how the rhythms of life can be used to improve the practice of medicine - and your health.
These time-related medical observations, and others still in the exciting process of discovery, are rooted in chronobiology (chronos - time; bios - life; logos - science), the study of biologic rhythms.
The kinds of biorhythms: physical, emotional, intellectual cycles and secondary rhythms.
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