Methods of diving:
Step 1: First understand your physical condition.
To be fully prepared in mind, learning diving is different from other courses, learning the skills of safe diving, a lot of skills need to be completed by yourself, can not cope with things. It takes all your concentration to complete the entire dive course. Before diving, you need to make a health declaration form to ensure that your physical condition fully meets the requirements of diving activities. Step 2: Scuba breathing adaptation.
Humans don't have gills. They breathe with their lungs. Therefore, it is impossible to breathe underwater like fish, but humans have invented scuba diving systems. Maybe you just breathe when you are very uncomfortable, because the nose is covered in the face mirror, you can only use your mouth to suck milk like a straw, once you get used to this breathing, in fact, you may learn another completely different way of breathing, that is, abdominal breathing.
Because you are usually used to doing shallow short chest breathing with your nose, the benefits of abdominal breathing are: 1, expand lung capacity, improve cardiopulmonary function. It can maximize the expansion of the chest, so that the alveoli in the lower lungs can expand, allowing more oxygen to enter the lungs, improving cardiopulmonary function.
2, reduce lung infections, especially reduce the possibility of pneumonia.
3, can improve the function of abdominal organs. It can improve the function of the spleen and stomach, is conducive to relaxing the liver and gallbladder, promote bile secretion. Abdominal breathing can lower blood pressure by lowering abdominal pressure, which is very good for hypertensive patients.
4, to calm the mind puzzle.
thoracic respiration
Most women use chest breathing, only the ribs up and down movement and the chest slightly expanded, many of the bottom of the lung alveoli have not been thoroughly expanded and contracted, not a good exercise. In this way, oxygen can not be adequately transported to various parts of the body, and over a long period of time, various organs of the body will have different degrees of hypoxia, and many chronic diseases will be born.
Learning to breathe can effectively increase the oxygen supply to the body, so that the blood is purified, and the lung tissue can be stronger. At the same time, because the diaphragm and intercostal muscles are also exercised in the breath, vitality and endurance will be correspondingly increased, and energy will be more abundant.
Step 3: Overcome ear pressure.
To master the skills of ear pressure balance. The general ear pressure balance method is to pinch the nose from the mask above, so that the nostrils are blocked, and then blow hard, (not with the mouth to blow, is to block the nostrils with the nose after the air, be careful not to force, can be repeated several times) the air into the ear tube.
Pay attention to the ear pressure balance in the water, do not continue to dive to maintain the depth, should be accompanied by a coach, do the ear pressure balance to keep the head up, the head position is easier to implement (pinch nose).
Reasons why you can't sink while swimming:
1. Anxiety generation:
Anxious divers move their hands and feet more often, and this creates a force that moves them toward the surface. That's why novice divers almost always use more weight than experienced divers; They tried to overcome the buoyancy of kicking the frog's shoes when they were nervous while diving by adding lead.
Tip: Tuck your frog shoes up close to your hips, and wrap your hands around your knees so they're still. Or clamp your arms close to your body and point your toes down to reduce resistance.
2. Air in BC:
It is found that BC will hide bubbles in the air bag behind the head, especially the back air bag type BC, you can check the air bag behind the head, if there is a bubble blocked in there, you will feel the air bag there as if there is a pillow behind the head.
Tip: When you open the exhaust valve, lean back in a recliner position, which allows the air to move toward and out of the exhaust valve.
3. The air in the cold suit:
The air bubbles trapped in dry suits by divers using dry suits can sometimes be large. At the end of the dive, if the diver uses a proper counterweight and aeration, there needs to be only enough air to keep it dry inside the suit, which looks squished and crumpled.
It is not possible to completely expel air from a dry suit with the movement of bending and hugging yourself. Only water pressure can do this.
Tip: Go into the water and swim a little deeper. Up to the neck, while opening the neck packing ring a finger width to allow air to escape. Be careful not to let water in through the packing ring.
Even wet suits initially retain some air, and the material traps thousands of tiny bubbles inside. Therefore, it is easier to form large bubbles in the underarm and groin. And plush fabrics are more likely to harbor small air bubbles than glossy fabrics.
Tip: Be patient. Immerse yourself in water and wait for a few minutes. Open a finger band of the neck to allow air to escape, or more thoroughly, pull the chain to allow air to escape. Move your arms and thighs to let the air move up faster. Pat the hood, or let the opening of the hood face up to expel air, so that the hood does not become a buoyancy bag.
4. Air in the lungs:
Before entering the water, it is natural to fill the lungs with air. After entering the water, shallow breathing uses the top tissues in the lungs to exchange air. At this point, you exhale half of the air from your lungs, and then quickly take in all the air. This creates extra buoyancy, and in the long run, this type of breathing poses a risk of carbon dioxide accumulation.
Tip: When you decide to dive, exhale as much as you can, and do not inhale until you have sunk to a depth of 1-2 meters. Hold the first breath until a few meters down, and then start breathing normally.
Extended information:
Diving safety precautions:
1. Dive with others
Diving alone or separated from other divers does not cause surprises, but it does mean that if something goes wrong, additional help is not available. Participate in organized diving, such as attending a proper diving club or dive shop, professional liveaboard, diving courses or other supervision to ensure that dive professionals and emergency support equipment are available in case of problems.
2. Know when and where you're going diving
It takes skill and experience to know when and where to dive. One of the most important concepts of safety is that every diver has the right to make a \"no dive\" decision at any time.
Other divers will respect this decision regardless of whether it is based on environmental conditions, physical condition, equipment issues or planned diving activities. Never go diving in any condition.
3. Pause for comfort and safety
As a diver, it has to be done in a safe and reasonable way. Under control, slowly coming to the surface.
Learn to solve problems in the water by stopping, breathing slowly, controlling yourself, thinking, and then taking deliberate action.
Breathing underwater is the most important adaptation process for learning to dive, and it deserves more attention.
Successful adaptation to diving should require slow, long and relaxed breathing, with special attention to a conscious, complete exhalation, even under pressure.
4. Slow, controlled ascent
A slow controlled ascent and a three minute safety stop at 5 meters helps prevent decompression sickness (DCS), reduces the risk of injury, including air embolism, prevents partner separation, and reduces the risk of collision with a boat or other object.
Normal ascent should use neutral buoyancy to release air from the BCD or dry clothes, because the air inside the BDC or dry clothes will slowly expand as you ascend. The rate of ascent should be 30 feet (10 meters) per minute. The appropriate length of time can be determined by the electronic diving watch.
Reference source: Baidu Encyclopedia - Diving
Just be normal.