(1) Exercise with a lot of exercise, especially in a hot environment, and the body sweats a lot. If water is not replenished or insufficient, urine volume will decrease, urine proportion will increase and urine color will deepen.
(2) Under normal physiological conditions, the body's red blood cells age, the cell membrane ruptures, and the hemoglobin in the red blood cells swims into the blood for further decomposition. Urobilin is one of the decomposition products. Urobilin binds to polypeptide and is excreted with urine, which makes urine yellow. During exercise, the blood flow speeds up, blood cells collide with each other, the cell membranes of more red blood cells rupture, the hemoglobin dispersed in the blood increases correspondingly, and the urine and bile, its catabolite, increase.
In sports activities, especially in hot environment, a lot of water will be lost. Reasonable and timely water supplement is not only helpful to maintain blood volume, but also beneficial to blood circulation and heat dissipation of the body. On the contrary, if the body loses water during exercise, but it cannot be replenished in time, it will cause blood concentration, accelerated pulse, increased body temperature, decreased exercise ability and fatigue.
Reasonable hydration before exercise, but not too much, because too much can't be absorbed, it will stay in the stomach, causing stomach discomfort, and at the same time, a lot of water will enter the blood, dilute the blood, and increase the burden on the heart, kidneys and excretory organs. Don't drink a lot of water at a time during and after exercise, and let your body gradually get a "small amount and many times" supplement. It is advisable to supplement about 250 ml every 15 minutes, and not more than 1000 ml per hour. The water temperature is preferably 8- 12 degrees Celsius. In addition, it is best to choose sports drinks rich in electrolytes and sugar. Because the body sweats a lot, potassium, sodium, calcium, magnesium, phosphorus and chlorine are lost more, the main energy substance (glycogen) of the body is consumed more, and the electrolyte in the body is unbalanced because of the loss. At this time, if you simply replenish water, you will not quench your thirst, but feel that the more you drink, the more electrolyte will be lost. Therefore, while supplementing water, it is necessary to supplement corresponding electrolytes and sugars to maintain the balance of electrolytes in the body and supplement the energy consumption of the body.