Vestibular system and motion sickness syndrome
“I would like to know more about the coordination of movement. I have so-called” sea-sick “in a severe form, ie I sensitive to the slightest movement of the support in the way, even to the one that does not feel the rest.”
Vestibular system is located in the inner ear – a tiny, but very difficult to arranged system. The final development of its ends to the 10 – 12 and then to 15 years. Vestibular system, admittedly, still not well understood by experts, extremely sensitive to the Earth’s gravitational field, the force of gravity. From a physiological point of view, this machine – part of a complex mechanism that allows us to navigate in any three-dimensional, even in the support-free space, and maintain the balance of the body. Thanks to him and his eyes closed one can accurately determine its location.
Thus, the vestibular system is the body balance. Receptors Its annoying tilt or head movements, while there are reflex contraction of muscles, straighten the body and contribute to the preservation poses. With the vestibular receptors are perceptions of the head in space, and the perception of body movement.
The destruction of the semicircular canals and the vestibule causes loss of sense of balance. Dove after the destruction of the labyrinths can not fly. If the guinea pig by burrowing into the ear of chloroform off one side the labyrinth, it begins to roll on the table, rotating about the longitudinal axis of the body.
In humans, the orientation in space is in addition to the organ of equilibrium, with the help of view, proprioceptive and tactile (skin) sensitivity. Thus, the pressure on the soles of the feet, the perceived tactile receptors, indicates the direction of the force of gravity. Do not dumb vestibular function. Inclination of the head they feel with the neck proprioceptors.
Threshold inside is lined with flat endothelium and filled with endolymph (fluid). It has two parts, called spots, where the receptor hair cells, which are suitable sensitive vestibular nerve fibers. Sensitive hair cells embedded in a gelatinous mass containing stones, or otoliths, which consist of small crystals of calcium carbonate.
The round bag spot located in the vertical plane, and the oval (utricle) – in the horizontal. In the normal position of the body force of gravity causes the otoliths to put pressure on certain hair cells. When the crown of the head is turned down, the otolith is slack in the balance, with the lateral inclination of the head one otolith presses on in the hair, and the other is slack. A change in pressure of the otoliths, irritated hair cells, signaling the status of the head in space.
Sensitive cells in vials scallops semicircular canals are excited by movements of the endolymph that fills channels. When turning your head at first because of the inertia of the endolymph lags behind the movement, and when it is finished, it is still some time moving. Hair cells are irritated endolymph movement, it causes a sense of speed and reflex movement of the eyes and head.
Since the three semicircular canals located in the 3-axis, the motion of the head in any direction causes the endolymph. People used to the movements in the horizontal plane, and the unusual move up and down or sideways when lifting the elevator or dusting can cause dizziness, nausea and vomiting. Training (swing) reduces anxiety body balance and prevents adverse events.
Unfortunately, the vestibular system, like any other organ, is vulnerable. Signs of trouble there is a syndrome of motion sickness. It can serve as a manifestation of a disease autonomic nervous system or the gastrointestinal tract, inflammatory diseases of the hearing aid. In this case thoroughly and aggressively treat the underlying disease. As you recover, usually disappear and unpleasant sensations that occur while traveling by bus, train or car.
But sometimes swayed in the transport and healthy people. Sometimes this leads to a tragedy. There are cases of people who went on a long voyage, committed suicide, the desperate, almost insane, rocking. Sadly ended the story of a young girl who longed to be a dancer, but forced to leave forever even thought about ballet. If certain steps, sweeping turns and multiple rotations she could not keep his balance, there are unpleasant symptoms of motion sickness.
Prevention of motion sickness
What to do quite healthy people with the syndrome of motion sickness? Must be well to remember that in untrained, sedentary person at some point begins to sharply deteriorating health, and the deterioration of the whole body leads to dysfunction and vestibular apparatus. Conversely, hardened almost always feels good. So even if you are sensitive vestibular system, it is less painful and takes motion sickness does not feel it at all.
Sports, physical exercise not only develop certain muscle groups, but also beneficial to the entire body, in particular, on the vestibular apparatus, training, strengthening him. The most suitable sports for people prone to motion sickness – aerobics, jogging, basketball, volleyball and football. When you scroll through the site or field with different rates sharply reduced excitability of the vestibular apparatus, the process of adaptation to the loads, which helps a person to get rid of motion sickness.
How to train the vestibular system? Training consists of the following exercise: different tilt and swivel head, her smooth rotation from one shoulder to the other, tilt, swivel, rotate the body in different directions. These exercises you can include complex morning exercises or do them during the day. Initially make every move 2 – 3 times, gradually bring the number of repetitions to 6 – 8 times or more, focusing on health and mood during class. Also useful are tumbling, gymnastic exercises on the bar, the log.
Do not neglect and passive training. Swing in a hammock on a swing. Various carousel rides also serve to strengthen the vestibular system. Do not deprive yourself of wholesome entertainment, do not deny them their children.
Paramount importance and mood in which you go on the road. Autosuggestion before the trip and during it, auditory training, confident that everything will go well, fond memories or dreams of a future in which you can dive, entering the bus or sitting in the train will be able to save you from a painful wait qualm or fainting , to drive away unpleasant feelings that accompany the syndrome of motion sickness.
By the way, going on a trip, not gluttonize, overeating is unacceptable for people with sensitive vestibular system, but you can hit the road and on an empty stomach.
Another, purely practical advice is to always leave the house early. In the event that, sensing the approach of nausea, fainting, dizziness, weakness (these characteristic symptoms of motion sickness, especially sharply manifested in the hustle and stuffiness), you could get out of the car or the bus subway car and slowly walk part of the way on foot. Such foresight on your part will help relieve tension, avoid the stress of fear out trip, and perhaps the most rocking.
Finally, there is another way of getting rid of sickness syndrome – drug. Going on a long trip, bring Aeron (or any equivalent), which reduces the sensitivity of the vestibular system. But do not abuse this facility, or quickly develop a habit, and tablets will no longer have the desired effect. Medicines in pharmacies is a great choice, so that, in consultation with a specialist, you will be able to pick up the drug for themselves.
Hidden sickness syndrome
A few words about the phenomenon of hidden sickness syndrome. Sometimes a person does not realize that is subject to motion sickness. For example, a sailor, as they say, “walks” on a little boat and did not experience any discomfort, but when he set foot on a big ship, sail, slightly swaying, it “knocks down” motion sickness, which is akin to motion sickness. The passenger can tolerate travel by bus, tram, and seemingly more comfortable lightweight car with a soft, smooth ride it suddenly starts to rock. The driver works fine with his driving duties. Each time getting into the car, he unknowingly sets the goal – to follow the road, follow the rules of the road, not to create emergencies. It’s the slightest manifestation blocks sickness syndrome. But here’s the driver was not familiar to the driver’s seat himself, and nearby, and during movement begin to torment typical sickness syndrome discomfort.
Hidden sickness syndrome may play with a man he had never known about him, a cruel joke. But the easiest way to get rid of him, no longer go to, say, cause dizziness and lightheadedness tram. Usually in this case, bus or other mode of transport does not cause these symptoms.
Constantly tempered and exercising, setting himself on a victory and success, people can cope with the syndrome of motion sickness and, forgetting the unpleasant and painful sensations, without fear to go.
“I heard that after the first astronauts in space lose bone rigidity and become flexible, resembling fish. Can you learn more.”
In weightlessness, as a result of weight loss and the otolith endolymph orientation in space can only occur through a view. The excitability of the vestibular apparatus is increased, which can cause a disruption of autonomic functions (blood pressure, respiration, heart rate, etc.). No load on the musculoskeletal system reduces the impulses from proprioceptors, which leads to a decrease in the tone of the cerebral cortex and skeletal muscle. Prolonged exposure to weightlessness and the absence of specific muscle exercises can muscle atrophy and bone due to the evolution of large amounts of calcium and phosphorus.