EWOT Needs - Is 6LPM Enough?
EWOT- 5 liters, 10 liters, 15 liters or more?
So what do we need for EWOT? Let's dissect what is going on, for a thorough understanding. Let's begin with a review of the current literature.
The Canadian fire fighter study evaluated performance based upon 40% oxygen density. What was revealed was performance increase of 21.8%.
Linossier, in 2000 reported that breathing 65% oxygen during exercise resulted in a 38% longer workout time before exhaustion.
Plet in 1992 reported that breathing 55% oxygen during exercise extends workouts 38% longer.
These reports reveal that oxygen enriched air enhances exercise capacity during treadmill, cycling and during firefighter tasks and rowing. The use of oxygen enriched air has been found to produce effects such as reduced heart rate, higher levels of physical performance, lower levels of perceived exertion, greater caloric burn and increased time to fatigue. The reported degree of performance improvement varies from study to study. There is no consensus as to the optimal oxygen fraction to use. There is consensus that increasing inhaled oxygen density results in greater energy production.
The normal rate of breathing is roughly twelve breaths per minute. Each breath, under resting conditions, is one half of a liter in volume. The simple math thus reveals that at rest, the average human inhales approximately 6 liters. During exercise, breathing rate and volume increase buy up to thirty fold. This means an exercising human has the capacity to breathe, 180 liters per minute, or more.
Is it feasible to provide 95% oxygen for all ventilary needs while EWOTing.
Let's assume we are an EWOT purist. What that means is that we wish to supply 100% of our ventillary needs with 100% oxygen density. To accomplish our goal, we would need to have a supply of 100% oxygen, delivered through closed delivery such as a Douglas Bag. Our oxygen supply would need to perceive physiological demands and graduate the volume of oxygen required for each level of exercise. Our oxygen supply would also need to compensate for the idea of ventillary resistance. Ventillary resistance is referenced in the fire fighter study. The idea here is that tubing is a resistance to the flow of a gas. We would have to provide pressure above one atmosphere (positive pressure flow) so that at the moment of inhalation, enough oxygen is available for the sudden burst of oxygen flow. We would also need to control the exhaled air so as to not comingle exhalation with inhalation. Our equipment need would be a system with the capacity to provide 180 liters per minute.
The above purists needs are the reason EWOT has been so difficult to provide and has been slow to catch on. If you are in need of pure EWOT, read no further and forget the idea of EWOT.
The EWOT realist studies current literature and discounts the notion that we can engineer a system which even comes close to what the purist has in mind. So what is the correct combination of purity, flow and delivery device?
Studies reveal that EWOT benefits begin at an oxygen density of anything above room air (21%). Oxygen density evaluated in the above studies is from 40-65%.. These studies provide us with the physiologic benefits of EWOT in that study range. I feel comfortable that what I am doing to my body has been studied and the physiological effects are known.
Studies reveal that oxygen purity for EWOT shall be in the 40% to 65% range.
It is not feasible to provide graduated flow to meet the demands of ventilary volume while gradually building to exercising at maximum. No one makes a 180 liter concentrator. Tanked oxygen would run out before one complete workout session.
I will open with the idea that EWOT is not a medical procedure. EWOT is one component in a complete exercise program. EWOT shifts metabolism in favor of muscle. In doing so, muscle can perform with greater capacity and duration and thus provide us with improved muscle strength and greater caloric burn for each minute of exercise.
EWOT can be performed with a mask, nasal cannula or an open breathing device such as the Oxy Sport headset. To understand the benefits of each device we need to understand the concept of moment of inhalation. Moment of inhalation is that 2-3 seconds when a sudden flow of air travels into the lungs.
With a mask, oxygen available for inhalation is that volume present within the mask and any 12px volume of oxygen coming into the mask during the 2-3 seconds while inhalation occurs. If you think of it, that's not much oxygen availability.
With a nasal cannula, oxygen availability is that volume of oxygen contained within the nasal cavity plus the 12px volume of oxygen delivered during the 2-3 seconds of inhalation. Again, that's not very much oxygen when diluted down with comingled room oxygen.
With the Oxy Sport, there is a continuous flow of oxygen into the bolus of the oral cavity as well as into the general region in front of the mouth. Thus, an inhaled breath consists of the oxygen within the oral cavity, increased oxygen density of the air immediately in front of the oral cavity as well as the oxygen delivered from the cannula during the 2-3 seconds of inhalation. That makes sense. The oral cavity is larger then the nasal cavity and having oxygen rich air around my mouth improves the oxygen density of what I am breathing.
Oxyvital has evaluated all factors when we come to a recommendation on a system which functions well and is easy to use. Our conclusions are that a six liter system, delivering 90-95% oxygen, with the Oxy Sport open delivery device provides an oxygen density of 40-65% at the moment of inhalation. The physiology of this density of oxygen is supported by current literature.