1. Why do you get seasick, carsick and airsick?
Motion sickness, also known as motion sickness, is a general term for motion sickness, seasickness and airsickness. It refers to cold sweat, nausea, vomiting, dizziness and other symptoms caused by excessive exercise stimulation of vestibular balance receptors in human inner ear and excessive bioelectricity of vestibular organs when riding vehicles.
The vestibular organ of the inner ear is the balanced sensory organ of the human body, including three pairs of semicircular canals and the oval sac and balloon of the vestibule. There is ampulla crest in semicircular canal and otolith (also called capsule point) in elliptic capsule, which is the vestibular terminal receptor and can feel the stimulation of various specific motion States. The semicircular canal is stimulated by angular acceleration (deceleration), while the balloon of elliptical sac and balloon is stimulated by horizontal or vertical linear acceleration (deceleration). When the vehicle we ride rotates or turns (for example, the car turns and the plane moves in circles), the angular acceleration acts on the corresponding semicircular canals on both sides of the inner ear. When the hair cells in the ampulla of a semicircular canal are stimulated to bend and deform to produce positive potential, the opposite hair cells bend and deform to produce negative potential (negative voltage), and the exciting or inhibiting electrical signals of these nerve endings are transmitted to the vestibular center through nerves and perceive this movement state; Similarly, when the vehicle has linear acceleration (deceleration) changes, such as car starting, acceleration and deceleration braking, ship shaking and bumping, elevator and airplane lifting, etc., these stimuli cause deformation and discharge of hair follicle hair cells in vestibular elliptic sac and balloon, which are transmitted to the center and are perceived. The generation and transmission of these vestibular electrical signals will not cause adverse reactions within a certain limit and time, but everyone's tolerance for the intensity and time of these stimuli is limited, and this limit is the vertigo threshold. If the stimulus exceeds this limit, there will be motion sickness symptoms. Everyone's tolerance varies greatly, which is not only related to genetic factors, but also influenced by vision, individual physique, mental state and objective environment (such as air smell). Therefore, under the same objective conditions, only some people have motion sickness symptoms.
2. How to prevent and treat carsickness (seasickness, carsickness, airsickness)?
Accurately speaking, carsickness is not a real disease, which is different from the usual diseases. It's just an emergency response of sensitive organisms to over-limit stimuli. Therefore, there is no real radical cure or cure, and the existing prevention and treatment methods are to temporarily relieve symptoms or delay their occurrence.
The best way to prevent and treat motion sickness is to avoid or leave the environment that can cause motion sickness, but this is unrealistic. In the past, many drugs were used to prevent and treat motion sickness, mainly sedative and emetic drugs, such as Cheng Yunning, scopolamine, diazepam, etc., to inhibit central excitement and relieve gastrointestinal spasm. However, these drugs have many side effects, slow action, dry mouth and drowsiness, and the curative effect is not ideal. There is a skin patch behind the front ear, which is a slow-release scopolamine. It can be absorbed through the skin, but it still cannot eliminate the inherent side effects of the drug. Other methods, such as sticking navel, pressing Neiguan point, opening window for ventilation and looking forward, are also commonly used, and the effect is extremely limited. There is also vestibular exercise, which, like pilot training, repeatedly stimulates the vestibule for a long time, such as swivel chair, swing, crouching tiger, rowing and so on. To make the vestibule adapt to the habit can achieve the purpose of relieving motion sickness symptoms. But if you stop training or leave the exciting environment, the symptoms of motion sickness will reappear.
In the past, vestibular balance medical experts from all over the world have been committed to the prevention and treatment of motion sickness for a long time, but with little effect, there has been no breakthrough. Now, Professor Hu Guang Ai, director of the Otolaryngology Research Institute of Tianjin No.1 Central Hospital and director of the Vertigo Diagnosis and Rehabilitation Center, and the chief physician, after more than ten years of clinical research, have invented an electronic anti-motion sickness instrument according to the principles of vestibular balance medicine and classical vestibular clinical theory. The instrument generates pulsed electrical signals through electronic oscillation, and then acts on the vestibule, the balance organ of human inner ear, through binaural electrodes, so as to counteract or weaken the excessive bioelectricity generated by excessive movement-linear and angular acceleration (deceleration) stimulation, reduce and prevent vestibular nerve impulses from transmitting to the center, thus improving the tolerance of vestibular organs to various sports stimuli and achieving the purpose of treating motion sickness. This is a brand-new and pioneering treatment for carsickness. In the process of use, users can always keep a clear head, change the state of irritability, thirst and drowsiness when taking sedatives in the past, and make today's journey chic and brisk, so that they can enjoy the beautiful scenery of the motherland and the happiness of modern civilization.
The research project was rated as "the first in the world" by experts, and won the Tianjin Science and Technology Progress Award, the National Invention Expo Silver Award and the national patent (98 3 26062.438+0) successively, and was listed as a scientific and technological innovation promotion product in Tianjin. This product (No.:22603 1, No.98, Jin (Zhun)) was put on the market and was immediately praised by the majority of carsickness patients.
3. Why do carsick people drive or not?
Because carsickness is mainly caused by excessive stimulation of human vestibular nervous system, the excitability of vestibular nervous system is the key. The vestibular nervous system belongs to the low-level center, which is influenced by the high-level center of cerebral cortex, and the high-level center has inhibitory effect on the low-level center. People with carsickness are in a highly concentrated state when driving, and the high excitement of the advanced cerebral cortex inhibits the vestibular system, so naturally they will not get carsick. But when riding as a passenger, there is no such effect. Similarly, when the battle alarm sounded, sailors who were originally seasick were immediately able to fight high.
4. Why do some people get carsick, but they don't get carsick after fainting?
Good vestibular function of inner ear is one of the basic conditions for motion sickness (seasickness, carsickness, airsickness). If the vestibular function is lost, the human body will lose the ability to accept all kinds of acceleration (deceleration) sports stimuli, that is, all kinds of bad or over-limit stimuli that cause motion sickness will lose their effect on the human body. Therefore, some people with bilateral vestibular dysfunction (ototoxic drug poisoning, bilateral labyrinthine resection, repeated vertigo attacks, etc. ) After getting dizzy, you won't get carsick.
5. Why do carsick people get carsick more easily with the more advanced means of transportation?
Although the vestibule of the inner ear has a good function and can accept all kinds of acceleration (deceleration) stimuli, which is one of the basic conditions for motion sickness (seasickness, carsickness and airsickness), a certain range of acceleration (deceleration) stimuli are suitable for motion sickness, but those high-frequency bumps (produced by ordinary vehicles) are not suitable, but the surging acceleration and shaking produced by vehicles with good balance are most suitable for vestibule. Therefore, the more advanced the vehicle, the easier it is to get carsick.
6. Will the smell of gasoline make you carsick?
Motion sickness is caused by excessive stimulation of the vestibule of the inner ear. The smell of gasoline may aggravate the nausea of some carsickness patients, but it is not the cause of carsickness. Imagine staying at home and smelling gasoline will make you carsick? As for some people who are allergic to gasoline, that is another matter.
Three methods to prevent carsickness
1. carsick people take Shangshi Zhitong Ointment 1 tablet one hour before taking the bus and stick it on the liver and navel (called Shenque point). If you ride for more than one day, change to another post the next day. Can effectively prevent carsickness.
2. Fasten your seat belt before getting on the bus to prevent internal organs from swimming excessively in the body, which helps to prevent carsickness.
3. There is a piece of ginger in your mouth. People who love carsickness should take a piece of fresh ginger with them and eat 2 pieces of fresh ginger before getting on the bus, which can greatly reduce carsickness.
(selected from Science and Technology Abstracts)
Motion sickness, seasickness and airsickness
CCTV International 200365438+February 26th 16:44
Motion sickness is not only related to the individual differences of human body, but also related to the balance system of vestibular balance organs. Vestibular organ is a very important organ of human body. Just as the function of eyes is visual response and the function of nose is olfactory response, the function of ears is to produce hearing, and the function of vestibule is a very important organ to maintain human balance. The vestibule can feel the changes in the position and posture of the human head, and can adjust the posture of the human body at any time to achieve body balance. Look at a model. The vestibule is just outside the cochlea.
How does vestibule play the role of balance?
The vestibule works all the time, just like our cochlea can hear sounds all the time. The vestibule is always aware of the position of the human body. For example, when a normal bus suddenly brakes, people who are standing tend to lean over, but they will soon control their bodies and will not fall. At this time, the vestibule is working, adjusting its body posture and achieving a balance.
Does it mean that the vestibular function of people with motion sickness is weak?
Can't be easily understood. In fact, the vestibule of carsick people is in a disordered working state. Let's watch a series of short films: this is a beautiful diving scene. When an athlete performs graceful tumbling and jumping, it is the vestibule that accurately judges the position of the body, so as to achieve the action of balancing the body.
So are athletes' vestibular organs more developed than ordinary people?
The vestibular organs of athletes are indeed particularly stable, but at the same time, they must undergo special training to achieve superb balance.
In a small space like a car, the range of activities is actually not large. Why do you get carsick?
If there are some abnormal feelings during running and some special situations during exercise, then there will be motion sickness, such as feeling uncomfortable in the carriage, or the surrounding air is not good, or running often encounters some complicated traffic conditions, which will cause some frequent stimulation to the vestibule. If the tolerance limit is exceeded, there will be some carsickness symptoms such as dizziness, nausea and vomiting.
Why do carsick people vomit?
Some people with carsickness will have symptoms of vomiting, and vomiting is also a very important symptom of carsickness, which usually happens to patients with severe carsickness. The mechanism of vomiting is that the current chamber will be dysfunctional after being stimulated, and then the autonomic nervous system will be dysfunctional. The function of autonomic nerve is to maintain normal gastrointestinal peristalsis. After the disorder occurs, there will be reverse gastrointestinal peristalsis, which will cause vomiting. In addition, there are some receptors on the inner wall of our stomach. After some bumps between the human body and the car, these receptors will be stimulated or pulled, and then reflex gastrointestinal peristalsis will occur, which will also cause vomiting.
Why don't some carsick people get dizzy when driving?
This situation is because the vestibular nervous system is a complex nerve connection reflex system. If you are in a state of high tension or concentration, you may adjust the sensitivity of the vestibule. At this time, people who usually get carsick by car may not get carsick.
Why is it not easy to get dizzy when sitting in the passenger seat, but easy to get dizzy when sitting in the back seat?
That's true. Most people will give the passenger seat to people who are prone to carsickness. This is because the vision in the back row is not very good, so they can't look forward and will get used to looking sideways. Moreover, the space in front is relatively spacious than the space in the back, so it is easy for people with motion sickness to have a range of activities, and they will feel very relaxed at this time.
Does psychological suggestion work?
There are individual differences in nervous reaction, and some psychological adjustment can balance the stability of this nervous system, so giving yourself some good psychological hints before riding will alleviate the symptoms of carsickness.
Precautions for riding
1, don't eat too much, don't eat greasy food, eat some digestible food early.
2. Choose a well-ventilated seat in the front row by bus, boat or plane, keep your eyes on the front, or close your eyes and don't look at anything passing by the window.
3. Keep a happy mood, calmly suggest that you won't get carsick, remember good times and happy things, listen to music and chat with people.
4. Make sure to get enough sleep before going out to prevent fatigue, and don't read books in cars, boats and planes.
(Source: CCTV-The Road to Health)
Ginger is a traditional Chinese medicine for treating nausea. Studies have proved that it can relieve nausea caused by motion sickness and seasickness. Professor Sun Weiming of the University of Michigan and his colleagues studied seven healthy people aged 65,438+08 to 35, and put them in a large rotating drum for 30 minutes after meals, which caused motion sickness artificially. Before causing carsickness, take 1 g ginger powder or placebo orally.
When the drum rotates, the nausea index is measured on the scale of 1 to 3. The nausea index of ginger group was significantly lower than that of placebo group, the former was 1.0 on average and the latter was 2.5 on average. After the drum stopped rotating, the nausea index changed from 1 to 10, which was 1.5 in ginger group and 7.8 in comfort group. The time of nausea in the ginger group was also relatively late, with an average of 4.6, and that in the placebo group was 1 1.4.
At the same time, the researchers measured the subjects' gastric electrical activity. When the drum rotates, the gastric contraction amplitude of ginger group is normal, while that of placebo group increases by 7%.
Common anti-motion sickness drugs have obvious side effects, such as dizziness and dry mouth. According to this study, ginger can be an effective substitute for these drugs.
Health 123 net
Treat carsickness
-
"June 23, 2005 18:06 Sina Life.
Carsickness is a particularly uncomfortable thing. What should I do?
Get on the bus with ginger in your mouth.
You can cut two slices of fresh ginger commonly used in cooking at home and carry it with you. Putting two pieces of fresh ginger in your mouth before getting on the bus can effectively prevent carsickness caused by smelling gasoline.
Tighten your belt.
If you drink too much liquid before getting on the bus, it is likely to cause stomach motion sickness. You can fasten the belt buckle before getting on the bus, which can protect the internal organs from some car bumps and prevent stomach motion sickness.
Umbilical plaster
One hour before the bus ride, take a piece of Shangshi Zhitong ointment and stick it on your navel, which is Shenque point. Because borneol and musk contained in Shangshi Zhitong ointment will be slowly released in the body through acupoints, it can effectively prevent carsickness. If you ride for more than a day, change another one to make the effect last.
So many methods, enough for you? Hmm. How interesting