Caffeine - agent (alkaloid) is, in fact, bitter colorless crystals and contained in plants, particularly in the seeds of the coffee tree.Caffeine has other names - mateine, guaranine, which is also associated with the names of plants, which contain this substance.Besides caffeine, coffee tree is in the tea leaves, guarana, yerba mate, cola (family Malvaceae), and certain other plants.
plants synthesize caffeine to protect against pests and attract insect pollinators.And for the person caffeine - a psychostimulant that it receives, using tea, coffee, soft drinks and other products containing caffeine.
The effect of caffeine on the human body
consumed in small amounts of caffeine, stimulating effect on the human nervous system.However, the abuse of this substance can trigger the development of dependence (theism).
Caffeine is able to speed up the heart, increase blood pressure, to increase the allocation of dopamine in the blood, thereby improving the mood for a short time (about 40 minutes).However,
Scientists led by IPPavlov, who studied the effects of caffeine on the particular person, found that under the influence of caffeine activated the processes of excitation of nerve impulses in the brain.Also, when certain dosage caffeine enhances motor and intellectual activity.But at higher doses the same caffeine can cause depletion of neural cells.In fact, caffeine is a psychoactive agent and its effect on the organism depends on what type of higher nervous activity of man possesses.This fact, according to scientists, is to be considered first when determining the individual doses of caffeine for a person.
Thanks caffeine can significantly reduce the impact force on the body of sleeping pills and drugs.Caffeine contributes to excitation of the reflex function of the spinal cord, respiratory and vasomotor centers.
Influence caffeine affects the strengthening of heart activity as myocardium under his influence begins to contract more frequently and intensely.If human arterial blood pressure is normal, the effect of caffeine on it will not cause significant changes.
Caffeine also helps to stimulate the stomach and has a diuretic effect.
Features of caffeine
most popular drinks containing caffeine, for most of us are coffee and tea.Normally, we use products that contain caffeine in order to cheer up, that is based on the excitatory properties of caffeine.Therefore, morning coffee most of us helps to bounce back after a night's sleep.Green and black teas are used by us during the day, usually after meals often to quench your thirst.Wishes to rid your body of the exciting action of caffeine can be purchased as a tea and coffee with a reduced content of the substance - called bezkofeinovye drinks.
medical purposes caffeine is used to treat infectious and other diseases, which are accompanied by a violation of the central nervous and cardiovascular systems.Also, caffeinated treat narcotic poisoning and poisoning with poison, affecting the central nervous system.Apply caffeine and migraines caused by spasms of cerebral vessels.Showed caffeine and to increase physical and mental activity, getting rid of excessive sleepiness and lethargy.For medical Caffeine in certain doses physician appointed and children suffering from enuresis.It is used caffeine as a diuretic.
not less popular than coffee in recent years have, and energy drinks "Energy", which contain an average of 250 to 350 mg of caffeine per liter of liquid.Please be aware that special "energy" meant, for example, for the athletes, often contain a much larger amount of caffeine.For comparison, a cup of coffee in a small "espresso" - 50 mg of caffeine in cup natural coffee - 80-120 mg, in case of - from 30 to 60 mg, and cacao - only 2-5 mg glass "Coke" may includea 70 mg of caffeine.
maximum concentration of caffeine in the blood may be observed after 0.5 hours after drinking caffeinated beverages after 3-5 hours the concentration is halved.In smokers, and women taking contraceptive pills a half-life of caffeine in the body is much shorter.Perhaps it is this, and is based on a passion for coffee smokers.
To contraindicated caffeine
refuse caffeine, as well as any other products that excite the nervous system, it should be those who suffer from hyperexcitability, suffers from insomnia, have hypertension, atherosclerotic disorders, glaucoma, disorders of the cardiovascular system.Also, coffee is not useful for the elderly.As already mentioned, too much caffeine can be dangerous not only for health, but also to human life, so in death can result from the use of 80 to 100 cups of coffee for a limited period of time.
should know that the people nervous, prone to depression, even in a state of extreme fatigue, do not improve their performance by using caffeinated beverages.In this case, instead of the desired vigor can get the opposite effect, as the body will start their own deal with the process of excessive excitability of the nervous system.In general, anyone tired of the physical, emotional or intellectual stress, most reasonable to relax, change activity or just sleep.But a cup of strong coffee wise to have a drink after a rest before planning to start work.
Sometimes even the use of tea, can cause heartburn, stomach cramps and pain, frustration of a chair.However, in this case it is important to realize that these reactions are more related to the technology of processing of tea leaves than the caffeine contained in tea.Therefore, the recurring symptoms is reasonable to switch to drinking green tea, which takes gentle processing.
wonder, and that about 15% of adults experience an unusual reaction to caffeine, he does not invigorates, but on the contrary, causes lethargy and fatigue, that depends on the individual characteristics of the human body perceives the substance at the level of biochemical processes.
How much caffeine containing drinks
is important to understand that the content of caffeine in tea or coffee, directly depends on the type of plant, its age at the time of harvesting, a method of processing tea leaves or fruits (beans), storage conditions, etc.The younger the tea leaves, the less it contains caffeine.In the small-leaf teas caffeine concentration is higher than in large leaf.In the first and second sheet of the tea bush caffeine content is 3% higher than in the rest of the leaves.Moreover, you need to be aware of the fact that the products that say "decaf" will still contain about 3% of the substance.
Interestingly, brewing, for example, tea also affects the amount of caffeine located therein.Here, at least significant and the method of the infusion, and the temperature of water used and the duration of the process.Since the amount of caffeine in the tea brew already can vary between 180 and 420 mg per liter.Available in tea caffeine, though softer effect on the human body, but has a more long-lasting impact.
A cup of brewed green tea contain caffeine is slightly smaller than in black tea.And a cup of tea compared with coffee, on average 7-fold less than caffeine.It is important to consider the amount of dry material, which goes to the tea leaves.To better understand the figures: a cup of tea - is 0.012 g of caffeine, while a cup of coffee - 0.05-0.1 g
Medical studies have shown that caffeine in an amount of 0.05 g has a measurable impact on the brain and blood vesselsin an amount of 0.2 g significantly activates the activity of the heart, but 0.3 g of caffeine can have intoxicating effect on the human body.That means a cup of tea will not harm either the heart or blood vessels or the brain.And define an excessive amount of tea drunk or too high for the strength of the drink you can by heart palpitations after drinking tea.Therefore, the maximum per day is recommended to drink no more than 5-7 cups of tea, brewing it in accordance with the instructions on the package.
Summarizing all the above, we can make a very important conclusion - everything is good in moderation, but the abuse of even the most useful product can turn into poison.