Why does urine output decrease after high intensity exercise in athletes

1. During high-intensity exercise, water, which is the basic component of urine, is evaporated and consumed in large quantities, which will inevitably reduce the production of raw urine. This is also a major contributor to decreased urine output. Therefore, timely hydration, the body realizes the homeostasis of water and electrolytes in the body by regulating the amount of urine and the electrolytes it contains.

I don't think there will be questions from this angle in the exam, right? Exercise-induced urine protein, exercise-induced hematuria is more important and practical than this.

Good luck with the exams.

The body needs to consume water and carbohydrates during strenuous exercise, and when no fresh water enters the body, the bladder becomes the first of the water. The water in the bladder has been processed by the kidneys, and the urea content is high (basically urine), which is why the clothes on the body stink after sweating.

The sweat glands drain all the water, and the water that naturally enters the bladder will be less, so the amount of urine will be reduced.

Many athletes have short lifespans, many diseases, rapid aging, short adolescence, etc., and every long-distance runner has to reach their physical and mental potential to the limit.

Hello, if you exercise vigorously, you will sweat a lot, the human body will be dehydrated, and then the osmoreceptors of the hypothalamus will be excited, so that the posterior pituitary gland will release antidiuretic hormone (ADH). The main physiological function of ADH is to promote the reabsorption of water in the distal convoluted tubules and collecting ducts of the renal tubules, produce an antidiuretic effect, and reduce urine output.

During strenuous exercise, the human body consumes a lot of energy, because more than half of the energy released by aerobic respiration is lost in the form of heat energy, so in order to maintain a constant body temperature, the organism will cool down by sweating.

A lot of sweat is lost during exercise, of which 98% and 99% are made up of water, and the rest is urea, lactic acid, fatty acids and various electrolytes.

After exercise, water should be replenished in combination with the amount of sweating and the degree of weight loss. Hydration should also be repeated in small amounts, about four hours, so as not to cause gastrointestinal discomfort due to too rapid hydration. It is advisable to replenish water at times the amount of water lost, for example, if you lose one kilogram of weight after exercise, you should replenish liters of water.

Urine can also be observed, and clear urine indicates adequate hydration.

Answer]: c

The main reason for the decrease in urine output during strenuous exercise is the redistribution of blood, that is, blood gives priority to the heart, brain, and skeletal muscles.

Answer]: c When the sympathetic nerve is excited during strenuous exercise, both the incoming arterioles and the outgoing arteries are constricted, but the constriction of the incoming arterioles is more obvious, so the plasma flow of the round capillaries in the glomerular hairs is reduced and the blood pressure of the glomerular capillaries is reduced, resulting in a decrease in the glomerular filtration rate and a decrease in urine output.