This is useful black tea , green and who ?
main therapeutic effect of tea provide alkaloids.It is known to you, and caffeine is not very well-known - theobromine, nofilin, xanthine, hypoxanthine and paraxanthine.The last - caffeine antagonists.These and others are in black and green tea.The alkaloid caffeine provides a tonic effect at the beginning, which is not resistant, and soon after inactivation of caffeine enters the reaction of his antagonists.They reduce vascular tone and lead to lower blood pressure, high blood pressure, and desired not desired gipotonikam.According to this scheme "works" green tea. Black tea the second phase due to the high content of vitamins of group B, P and PP, continuing through fermentation preserves vascular tone and "holding" pressure.Here it is ideally suited and gipotonikam.
more detail the mechanism of action of black and green teas as follows.
tea Caffeine excites the cerebral cortex, dilates blood vessels, improves blood circulation and oxygen supply the brain.Therefore, with the use of tea are linked ac
Due to the high content of caffeine tonic effect manifests itself more actively in green tea.Black tea works more smoothly and continuously without causing any feeling of dryness in the mouth.
Practical doctors often prescribe green tea gipotonikam.However, after taking green tea, as a result of the stimulating effect of caffeine present in its structure, in the beginning there is quickening heart rate and breathing.Blood pressure increases slightly, feel better.Subsequently, as the increase in drunk strong tea, especially the 95-th test, people have a tendency to hypotension, there is a feeling of weakness, decreased blood pressure.These phenomena N. Nuraliev explains the different chemical composition of green and black tea.
The composition of both types of tea other than caffeine as you know, includes more alkaloids such as theobromine, theophylline, xanthine, gopoksantin, paraxanthine and ascorbic and nicotinic acid.All of these compounds, except for caffeine possess vasodilating action, i.e.caffeine are physiological antagonists.Black tea contains a lot of vitamin B, P and PP.From the literature it is known that a certain vitamin B1 doses increases vascular tone and blood pressure may increase.Catechins, including vitamin B, increase the tone of the capillaries.After receiving the green and black tea tonic effect arising directly connected with the action of caffeine.However, caffeine is rapidly inactivated and excreted from the body, and from that moment begins the second phase action of tea.That is, if the first-stage action, both physiological manifestations tea behave identically, in the second stage, after inactivation of caffeine, their pharmacological effect in regard differs sharply blood pressure.
After receiving hot tea under the action of vitamin C, theobromine, theophylline and other factors, vascular tone falls.In healthy individuals, this reaction goes unnoticed.For such a hypertensive effect of green tea is useful hypotensive and for, on the contrary, is very undesirable.In the second action phase of the black tea catechins pharmacological effect predominates or vitamin P-like substances.Raising the tone of the capillaries, they warn vasodilatory effect of theobromine, theophylline, as well as vitamins C and PP.In addition, a role played by vitamin C) in the manifestation of the tonic effect of black tea.Therefore, black tea, unlike green, does not impair the hypotensive state.
Analysis of the therapeutic properties of different types of tea confirms the correctness of the position of folk healers who believed green tea is beneficial for hypertensive patients and harmful for people with low blood pressure.That is, it should again be emphasized that patients with hypotension or those who have a tendency to faint, you need to refrain from taking strong brewed green tea.For them, the higher grades of green tea are absolutely contraindicated.
Contraindications of green tea are a form of hyperacidity gastritis, gastric ulcer and duodenal ulcer.These patients receiving green tea accompanied by the appearance of heartburn, stomach pain increased, in some cases - the emergence of intestinal colic.
Tea is a stimulating drink, so can not drink strong tea before going to bed.Nursing mothers should be aware that part of the caffeine is released through the milk, and drinking large amounts of strong brewed tea at night can cause insomnia in infants.Strong tea harmful to patients with elevated thyroid function (when the hyper-tireoze).Immoderate intake of tea, especially green, causes severe sleep disorders, exhaustion, palpitations, hand tremors and a number of other adverse reactions.