What does CNS stand for in scuba diving?
|CNS||Central nervous system toxicity. Toxicity is caused by oxygen. Can cause a variety of neurological symptoms. The most important of which is an epileptic-like convulsion which can cause a diver to drown.|
|CNS%||Central nervous system toxicity limit fraction.|
|Compartment||See Tissue group|
How is CNS diving calculated?
A CNS fraction is calculated by taking the time spent at a given PO2 and dividing by the NOAA time limit for that PO2. When the CNS fractions from all segments of the dive profile add up to 1 (or 100%) then the overall limit for CNS oxygen toxicity has been reached for that dive.
What is CNS loading?
In other words, the in water times are added together and compared against the Single Exposure Time. If one dive is at a greater oxygen partial pressure than the other, that pressure is the one used with the combined in-water times of the two dives, to calculate total CNS loading.
What is nitrox used for in diving?
Like everything else in a diver’s bag of gear and knowledge — nitrox is a tool that can be effective when used properly, but dangerous if not. Its purpose is to increase your no stop dive time, so you have longer dives and/or shorter surface intervals, all else being equal and gas supply allowing.
What is FO2 in diving?
FO2 is the fraction of oxygen or the % Oxygen. PO2 is the partial pressure of oxygen. P is the absolute pressure (depth divided by 10+1) The forward slash / is divided by. FO2 x P = PO2 = Fraction of oxygen x pressure = partial pressure of oxygen = Oxygen Dose.
What is CNS percentage?
The CNS value (short for Central Nervous System Oxygen Toxicity) is a measure of how long you have been exposed to elevated partial pressures of oxygen (PPO2) as a percentage of a maximum allowable exposure time.
What happens when there’s too much oxygen?
Oxygen toxicity is lung damage that happens from breathing in too much extra (supplemental) oxygen. It’s also called oxygen poisoning. It can cause coughing and trouble breathing. In severe cases it can even cause death.
Does being on oxygen weaken your lungs?
Unfortunately, breathing 100% oxygen for long periods of time can cause changes in the lungs, which are potentially harmful. Researchers believe that by lowering the concentration of oxygen therapy to 40% patients can receive it for longer periods of time without the risk of side effects.
Why is breathing pure oxygen bad?
Oxygen radicals harm the fats, protein and DNA in your body. This damages your eyes so you can’t see properly, and your lungs, so you can’t breathe normally. So breathing pure oxygen is quite dangerous.
What are the two types of oxygen toxicity?
There are two main types of oxygen toxicity that can affect divers: pulmonary toxicity and central nervous system (CNS) toxicity.
What does CNS fatigue feel like?
Mental Clarity- An easy indicator of a CNS fatigue is mental fog. If you feel forgetful or just slow in your thought process it could be indicative of an overextended nervous system.
How do you rest your CNS?
After a prolonged exercise regimen (regimens are typically 8-12 weeks), take at least 1 week off from anything intense to allow for recovery. Make sure to get adequate sleep between training sessions as this is the best way to let your central nervous system recover fully.