Why is it so tiring to travel by train or plane?

When we take the bus, because the car is at a constant speed, we keep balance with the car, but our center of gravity keeps changing. It is our vestibular organs that keep our body in balance, so the vestibule works all the time during riding, fine-tuning our center of gravity, that is, the brain works all the time, so people will be very tired after riding for a long time.

The air is not circulating.

We all know that no matter by train, coach or plane, it is closed and the air is not very good, especially by coach and train. If we are in an environment with poor air circulation for a long time, for example, someone smokes in the car, the smell inside the car will easily cause brain hypoxia. In addition, because we keep a posture for a long time, we can't rest our brains by moving our bodies, so we will be very tired. Although no one smokes on the plane, many people take off their shoes, the air is not very good, the ordinary cabin is narrow, and their bodies are not comfortable.

Prolonged inactivity

When we take a long-distance bus, our bodies always keep a posture, so our spine is also in a posture for a long time. The pressure on the small joints of the spine is getting bigger and bigger, which is easy to make the soft tissues on both sides of the spine too tense, leading to the secretion of lactic acid and making the soft tissues tense. Finally, the blood doesn't circulate, lactic acid can't be metabolized, and it can only accumulate in muscles, so the whole body aches after taking a long-distance bus. This is the same reason that we insist on playing mobile phones and watching TV for a long time.