The instructor of the article is Fang Guilong, a doctor of orthopedics in the Affiliated Hospital of Chengdu University of Traditional Chinese Medicine. Reprinting is prohibited without permission.

In physical education classes when we were in school, we were often instilled in the idea that we should not sit down immediately after running, or the hips will grow bigger.

This sentence does not seem to have much effect on boys, but it has a greater lethality on girls.

At that time, I didn't know how many teenage classmates were. No matter whether they ran 50 meters or 800 meters, they didn't dare to sit down and rest immediately.

When I was a child, I never thought that what the teacher said was right or wrong, but now I want to think about it: "Sit down immediately after running, will make your butt bigger" is there any truth?

Why does the buttocks become bigger

The first is exercise fitness, long-term exercise of the gluteal muscles , so that the buttocks become larger and warped. Such a figure is now the exercise target of many fitness men and women.

The other is hypertrophy of the hips caused by prolonged sitting . People who sit for a long time will not only relax the buttocks muscles, but also cause body fat to accumulate in the abdomen, buttocks and thighs. When the two negative effects are superimposed, the buttocks will be bigger and more conspicuous.

Based on the above two situations, the increase of the bottom is the result of long-term accumulation, and therefore the argument that "sit down immediately after running, the bottom will become bigger" is not accepted.

But why do many people believe this sentence?

This may be related to the soreness of our hips after running.

When running, in order to provide energy to the lower limbs, a large amount of blood flows to the hips and thighs.

At this time, if you sit down immediately, the blood circulation is not smooth, and there will be a swelling feeling accompanied by soreness in the buttocks. However, this feeling is subjective and does not mean that the ass is really getting bigger.

Other hazards of sitting down after running

Now that this fact has been clarified, does it mean that the behavior of "sit immediately after running" does not require admonition?

Nor is it.

Because when we run, the muscles of the lower limbs will contract regularly to encourage blood to flow back to the heart. If we sit down and rest immediately after running, the muscle contraction will suddenly stop. In this way, the blood that should flow to the heart may be lack of power. And siltation in the lower limbs.

The most direct effect of insufficient blood return is hypoxia in the brain , which can induce symptoms such as palpitation, shortness of breath, dizziness, pale complexion and even shock and fainting.

Therefore, even if you don't have the worries of "big buttocks", you can't sit down and rest after running.

In addition, there are three inappropriate ways to rest, I also want to remind everyone.

1. Drink plenty of water after running

After doing strenuous exercise, the body will sweat a lot in order to keep the body temperature stable and consume the salt in the body.

Drinking a lot of water at this time will further reduce the proportion of salt in the blood, disrupt the balance of water and salt metabolism in the body, affect normal physiological functions, and cause "water intoxication" in severe cases.

My suggestion is that if the amount of perspiration is low after running, you can rest for about 5 minutes, and then replenish water in small mouthfuls; if the amount of exercise is large and perspiration is a lot, it is best to wait for the heart rate to stabilize before replenishing, and follow a small amount of In principle, avoid ingesting a lot of water at once.

2. Take a shower immediately after running

The stickiness of the body after running is uncomfortable, but it is not recommended to rinse the body immediately.

Because after running, the body is still in a state of perspiration and heat dissipation. At this time, if you take a bath immediately, it is easy to cause skin vasoconstriction, resulting in difficulty in heat dissipation and muscle spasm.

So I suggest you wipe off your sweat after running to avoid catching a cold, and take a shower when you no longer sweat.

3. Blindly eating after running

After running, the gastrointestinal peristalsis is weakened, and the secretion of various digestive glands is greatly reduced. It is prone to indigestion problems after eating immediately. It is recommended to rest for 20-30 minutes before eating.

At the same time, I don't recommend fasting after running. After all, the body consumes a lot of muscle glycogen during running. If you want to restore energy and repair muscles efficiently, you need to add appropriate calories within 2 hours.