A pre-dive meal at KFC or MickeyD's to reduce risk of DCS?+

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Dan, just for your information, it appears you have to register on the site to read those articles.

Sorry... Mercola artilcle 1 following :


"Long-distance runners can, in fact simply drop dead -- usually in the middle of a run, from fatal heart attacks. In 2010, three runners died at the 32nd Detroit Free Press/Flagstar Marathon. In fact, about 14 percent of athlete deaths are linked to heart problems. Although exercise reduces your cardiovascular risk by a factor of three, too much vigorous exercise, such as marathon running, increases your cardiac risk by seven.
Healthier Talk reports:
“That’s because the further you run, the more stress you put on your body ... [L]ong duration exercise releases chemicals that flood your body. And that leads to inflammation ... If you have hidden heart problems, this can be seriously risky.”
Sources:
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Healthier Talk May 23, 2011


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American Journal of Cardiology October 15, 2001Volume 88, Issue 8 , Pages 918-920


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Circulation. 2006;114:2325-2333

Dr. Mercola's Comments:


Running a marathon is often seen as the epitome of fitness and the ultimate show of endurance. As a former sub 3-hour marathon runner myself, I understand the drive that pushes many athletes and weekend warriors to compete in these strenuous events -- but when you examine the research it becomes clear that doing so may put your heart at risk.
You've likely heard the stories about fit marathon runners who die suddenly in the middle of a race. Though rare (one study put the rate of sudden cardiac deaths during a marathon at 0.8 per 100,000 participants), it is certainly not unheard of, and it seems no one is immune to this risk. Even Olympic athletes have died in the middle of training.
This is because in the case of exercise, more is not always better.
Excessive cardio like that performed during marathons or triathlons is likely not much better at improving longevity than being sedentary. In fact, according to a study presented at the Canadian Cardiovascular Congress 2010 in Montreal, regular exercise reduces cardiovascular risk by a factor of two or three. But the extended vigorous exercise performed during a marathon raises cardiac risk by seven-fold!
This is a powerful lesson to anyone who engages in large amounts of cardio exercise, because as it turns out, excessive cardio may actually be counterproductive.
What Makes Marathon Running So Dangerous?

To put it simply, it puts an extraordinary stress on your heart, one that your body was not designed for. In the study mentioned above, researchers found that during a marathon more than half of the segments in your heart lose function due to an increase in inflammation and a decrease in blood flow.
Research by Dr. Arthur Siegel, director of Internal Medicine at Harvard's McLean Hospital, also found that long-distance running leads to high levels of inflammation that may trigger cardiac events, and a separate study published in Circulation found that running a marathon lead to abnormalities in how blood was pumped into the heart.
Even if you don't end up dying from sudden cardiac death during a race, years of marathon running can take a toll on your health. Research emerging over the past several years has now given us a whole new understanding of what your body requires in terms of exercise, and many of our past notions have been turned upside-down. It's now clear that exercising too much is a blow to your health.
For example, two recent studies showed:
  • Heart damage after lifelong cardio: In a study published in the Journal of Applied Physiology in February, researchers recruited a group of extremely fit older men. All of them were members of the 100 Marathon club, meaning athletes who had completed a minimum of 100 marathons. If running marathons provided cardiovascular benefit this would certainly be the group you would want to seriously examine. So what did they find?

    Half of the older lifelong athletes showed some heart muscle scarring as a result, and they were specifically the men who had trained the longest and hardest.
  • Heart scarring after elite cardio training: Recently published in the journal Circulation, this animal study was designed to mimic the strenuous daily exercise load of serious marathoners over the course of 10 years. All the rats had normal, healthy hearts at the outset of the study, but by the end most of them had developed "diffuse scarring and some structural changes, similar to the changes seen in the human endurance athletes."
Separate research published in the journal Progress in Cardiovascular Diseases also recently concluded that the best fitness regimen is actually one that mimics the movements of our hunter-gatherer ancestors, which included short bursts of high-intensity activities, but not long-distance running such as is required to complete a marathon.
The point is, too much of something that is normally good for you can have the reverse effect. So, although most people who read this are not exercising nearly enough, it's still important to understand that it is indeed possible to over-exercise -- especially if your primary focus is on traditional cardio or aerobics.
Are You Still Spending an Hour on the Treadmill?

Even if you're not a marathon runner, you may still be cheating your body of the optimal exercise benefits if you are focusing your workouts on long periods of cardio. According to fitness expert Phil Campbell and author of Ready Set Go, getting cardiovascular benefits requires working all three types of muscle fibers and their associated energy systems -- and this cannot be done with traditional cardio.
Here's a quick review:
  • Slow twitch (red muscle): Activated by traditional strength training and cardio exercises
  • Fast twitch (white muscle): Activated by Peak 8 exercises
  • Super-fast (white muscle): Consists of fast twitch AND super-fast fibers, activated by Peak 8 exercises
Unfortunately, most traditional cardio and strength training exercises work only red muscle fibers, completely missing your white muscle fibers, which then atrophy. If your fitness routine doesn't work your white muscle, you aren't really working your heart in the most beneficial way.
Your heart has two different metabolic processes: the aerobic, which require oxygen for fuel, and the anaerobic, which do not require any oxygen.
Traditional strength training and cardio exercises work primarilythe aerobic process and the slow twitch (red) muscle fibers. On the other hand, Peak 8 exercises work youraerobic AND your anaerobic processes, which is what you need for optimal cardiovascular benefit.
This is why you may not see the results you desire even when you're spending an hour on the treadmill several times a week. You're only working HALF of your muscle fibers!
In the case of Peak 8 exercises, less is more, as you can get all the benefits you need in just a 20-minute session performed twice a week. In fact, you should not do Peak 8 exercises more than three times a week, as if you do it more frequently than that you may actually do more harm than good -- similar to running marathons.
Your body needs regular amounts of stress like exercise to stay healthy, but if you give it more than you can handle you will actually lose your health. So it is really crucial to listen to your body and integrate the feedback into your exercise intensity and frequency. When you work out it is wise to really push as hard as you possibly can a few times a week but you need to wisely gauge your body's tolerance to this stress.
How to Perform Peak 8 Exercises

The key to performing Peak 8 exercises properly is to raise your heart rate up to your anaerobic threshold. Keep pushing at maximum effort for 30 seconds, and then rest for 90 seconds. Repeat this cycle for a total of eight repetitions. In other words:
  1. Warm up for three minutes
  2. Exercise as hard and fast as you can for 30 seconds. You should be gasping for breath and feel like you couldn't possibly go on another few seconds
  3. Recover for 90 seconds, still pedaling, but at slower pace and decreased resistance
  4. Repeat the high intensity exercise and recovery 7 more times
In the video below, Phil Campbell and I demonstrate how it's done.


Total Video Length: 22:16​
When you perform Peak 8 exercises properly it also helps increase your human growth hormone (HGH), which increases your muscle growth and effectively burns excessive fat. It also plays an important part in promoting your overall health and longevity.
I've been exercising for over 43 years, but for much of it I focused on running, or cardio. Adopting the Peak 8 exercises instead has made a HUGE improvement in my exercise program and has boosted my level of fitness.
The take-home message here is that one of the best forms of exercise to protect your heart is short bursts of exertion, followed by periods of rest.
By exercising in short bursts, followed by periods of recovery, you recreate exactly what your body needs for optimum health. Heart attacks don't happen because your heart lacks endurance. They happen during times of stress, when your heart needs more energy and pumping capacity, but doesn't have it. So rather than stressing your heart with excessively long periods of cardio, give Peak 8 a try.
I suspect you'll find the benefits to be as outstanding as I did.
Most importantly, during any type of exercise as long as you listen to your body you shouldn't run into the problem of exerting yourself excessively. And, with Peak 8, even if you are out of shape you simply will be unable to train very hard, as lactic acid will quickly build up in your muscles and prevent you from stressing your heart too much." [end of 1st Mercola artilce..}

 
The 2nd Article I referenced, dealing more with the evolution issue....and just an FYI, I dont see this as something I would argue about with anyone....I am about as sure of this as I am that blue is the "best" color :D

[FONT=Verdana, Arial, Helvetica, sans-serif]By Paul Chek, HHP, NMT
Founder, C.H.E.K Institute
[/FONT]

Most of you reading this article will be indoctrinated in the philosophy that regular cardiovascular conditioning is important for your health and that such training reduces your risk of heart attack. If you do agree with this premise, you are also very likely to believe that to achieve cardiovascular conditioning you must regularly perform cardiovascular exercises, such as running and biking or using one of the many cardiovascular machines.
But is this the case?
First let‘s look at the issue from a perspective of natural history.
Our evolution into the human species from our ape ancestors is thought to have occurred some 2.8 million years ago and possibly as long as 6 million years ago. It should interest you that in the early 1900s coronary heart disease was rare in the United States, but just 48 years after the grain industry began hydrogenating plant and grain oils in 1907, coronary disease was the leading cause of death among Americans.1
Now, I find it interesting that there is such a big hype over cardiovascular exercise as necessary prevention for heart attack or even heart disease, when such diseases were relatively nonexistent less than 100 years ago -- but a flash in the pan of human evolution.
Did Our Ancestors Regularly Participate in Cardiovascular Exercise?
This is not likely. First of all, it would not be energy efficient to run around gathering berries, firewood and nuts in your target zone.
Nor would it have been wise to run through the bush trying to get a workout in while hunting, since any animal would hear you coming from hundreds of yards away and be long gone by the time you got there. Worse yet, advertising your presence could mean dinner to a big cat.
If there was a cardiovascular stressor in our native environment, it was most likely when we had to send a messenger to a neighboring village or during times of battle, where you were either running for your life or fighting for your life for extended periods. Typically, performing any physical activity for 30 or more repetitions will result in an aerobic response in the working tissues.
When you look at most sports played today (See Table 1, below), recreational activities and work-related tasks, the great majority of them place anaerobic demands on the body.
Table 1. Contribution of short, intermediate and long-term energy systems to common sports. This information is useful in determining acute exercise variables for program design. Please note that most sports are anaerobic, yet many athletes and coaches make the mistake of using aerobic training to prepare for anaerobic sports, which actually decreases performance.
Referenced from:
M.C. Siff, Y.V. Verkhoshansky. 1993. Supertraining: Special Strength Training for Sporting Excellence. School of Mechanical Engineering, University of the Witwatersrand, South Africa.
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Badminton
Baseball
Basketball
Cricket
Fencing
Field hockey
American football
Golf
Gymnastics
Ice hockey:
forwards, defense
goalie
Lacrosse:
goalie, defense, attack
midfielders, man-down
Rowing
Rugby
Skiing:
slalom, jumping, downhill
cross-country
pleasure skiing
Soccer:
goalie, wings, strikers
half-backs or link players
Squash
Swimming and diving:
50m, diving
100m
200m
400m
1500m, 1 mile
Tennis
Track and Field:
100m, 200m
Field events
400m
800m
1500m, 1 mile
3000m
5000m
10 000m
Standard marathon
Volleyball
Weightlifting
Wrestling

SportShort Term
SystemIntermediate
SystemLong Term
System
801010
80200
85150
80200
90100
602020
90100
9550
90100
80200
9550
80200
602020
203050
90100
80200
0595
343333
80200
602020
503020
9820
80155
30655
204040
102070
702010
9550
90100
80155
30655
205525
204040
102070
51580
0595
90100
9550
90100
Aerobic Fitness-The Needle in The Haystack
Now, surely some of you grew up on a farm or have done hard labor before. When performing any intense work, you begin breathing faster and faster. As a matter of fact, you will go aerobic within a few minutes if the work efforts demand so much of your anaerobic energy systems that the demand for energy can‘t be replaced by anaerobic and intermediate energy systems (ATP/PC & fast glycolytic).
[FONT=Verdana, Arial, Helvetica, sans-serif]
Figure 1. Bucking Hay 2
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I have many memories of bucking hay. The bales weighed more than 75 lbs., yet you‘ve got to keep up with the tractor, as it moves through the field. And as you might have guessed, my dad didn‘t let me stop for a minute every 12 bales (See Fig. 1).
When there are thousands of bales to haul in, and you will be in the field for hours at a time, you will soon find that your anaerobic stimulus (the bales) produce a demand that the purely anaerobic phosphagen system can‘t maintain on its own. It only lasts about 8-12 seconds.
This results in ATP production by anaerobic glycolysis (which you may recognize as lactic acid production) and aerobic metabolism, respectively. By this very mechanism, our anaerobic capacity is recharged during sports such as tennis, soccer, hockey and basketball that require explosive movement for prolonged periods of time.
I use hay bucking because it is a real-world example of the type of natural anaerobic stimulus we have used to maintain aerobic fitness from the beginning of human evolution. If you can follow my logic here, you should be wondering why we are so encouraged to offer aerobic exercise to our patients and clients by most every medical, physical therapy, chiropractic and personal training education program that exists.
It‘s straightforward actually. It‘s the very same reason we are being told that we must eat a high carbohydrate diet for energy and the reason why doctors tell people they must take this or that drug ... BIG INDUSTRY INFLUENCE.
Exercise Equipment and Out of Pocket Expenses
Quite simply, there‘s not much money in the manufacture and sales of dumbbells, weight plates and Olympic bars, but there are HUGE amounts of money to be made if you can convince the masses that aerobic exercise is necessary for disease prevention.
After all, have you priced a treadmill, step mill, spin bike, rowing machine, elliptical machine or any such equipment lately? If you have, you will find they cost anywhere from several hundred, to several thousand dollars per unit. They often have hundreds of moving parts, which wear out, break and need to be replaced. How many Olympic bars or dumbbells have you replaced lately?
It is not at all unusual for a gym or rehab clinic to spend $75-100,000 on cardio equipment alone, and they will need to be replaced every few years. The same facilities usually don‘t spend more than $15-20,000 on free weight training equipment, which can last the life of the gym.
Yes, I know they spend large sums of money on fixed axis resistance training machines, but that is but another sign of industry influence and their ability to maintain misinformation and professional passivity.
When you get several large equipment manufacturers with multi-million dollar investments in the production of aerobic exercise equipment, you can be rest assured there will be a comparatively large commitment to creating an aerobic exercise consciousness.
The proof is all around us, in our exercise and bodybuilding magazines, trade journals, on TV infomercials, in our training manuals and from most educational institutions.
Who do you think sponsors the educational institutions and pays for the supportive research?
So, Who Needs It?
The issue is not one of prevention of cardiovascular disease by aerobic exercise. It is an issue of getting the right kind of exercise to benefit both your physiology and meet the demands of your work and sports environment.
For example, aerobic conditioning is not general. If it were, any world-class marathon runner could jump on a bike and win the Tour De France, or even the Hawaii Iron Man competition. Strength training is also not general. There is a very finite amount of carryover from one lift or movement pattern to the other. Otherwise, the best squatter would be the best dead lifter too.
[FONT=Verdana, Arial, Helvetica, sans-serif]
Figure 2. Lou Barry
[/FONT]
Everyone needs to build fitness, yet for fitness (aerobic or anaerobic) to last, it must be built upon a foundation of health principles. Proof of this premise can be seen when a noted running expert like Jim Fixx and champion bodybuilders like Lou Barry (See Fig. 2), previously Mr. Australia, died of a heart attack at an early age.
As I show clearly in my book "How To Eat, Move and Be Healthy!" , when we eat correctly for our nutritional type, eat high quality organic foods, eat regularly to maintain our blood sugar levels in an optimal range, get to bed at a reasonable hour and learn to manage our stressors, the addition of an exercise program of any type becomes truly therapeutic and offers disease prevention.
Aerobic fitness atop the standard American diet of carbohydrates, refined sugar, additives and preservatives will NOT offer resistance to disease. In fact, it may well bring it on.
Why?
The answer is simple: Both cardiovascular exercise and eating incorrectly are catabolic stressors that elevate glucocorticoid (stress hormones) production. If you add more tension to an already stressed system, it will crash.
You may think this is simple, logical, straightforward stuff, but it isn‘t, because again, there is BIG money involved here. I could list a thousand examples, but here‘s one that cuts to the chase: Scripps Hospital in San Diego recently partnered with McDonald‘s. So now McDonald‘s feeds all those sick and dying people in the hospital their unhealthy foods, while they pedal away on bikes, pump pedals on stair masters, and about every other expensive aerobic machine you can imagine.
If You Want Functional Aerobic Fitness [ END of what I am pasting...he then starts selling his book :D]
 
The normal mode for persistence hunters is not to try and run flat out for 26 miles, but rather to run a few hundred steps, walk a few hundred steps, run a few hundred, etc.
 
The normal mode for persistence hunters is not to try and run flat out for 26 miles, but rather to run a few hundred steps, walk a few hundred steps, run a few hundred, etc.

And that would be consistent with what Mercola is talking about...For me, it means my non-race pace training days, I do 2 minutes hard ( 25 mph or more), 4 minutes easy, 4 minutes hard, 8 minutes easy, etc.....interval type training usually Monday and wednesday, tuesday and thursday just easy rides ( 18 mph ), Friday easy but with a couple of ATP bursts and maybe 2 30 second efforts to 90% in order to open up everything for the Saturday morning pack/race pace ride :) I'm sure it's not real good for you, but it is alot of fun....:) So I just do one stupid ride per week :)
 
I just posted a position on an accident thread, and it is too relevant to this thread, for me NOT to bring this up here.

RELATED CONCEPTS OF SCIENTIFIC PROOF:
  • According to the softdrink industry, their is no scientific proof that Aspartame is dangerous to you. It is dangerous, if you ask me, and I have zero doubts about this. I also have no doubt it would cost the softdrink industry a fortune if a definitive study came out directly linking aspartame consumption with cancer, liver damage, insulin sensitivity, and inflamation related illnesses.
  • Put a raw egg between two cell phones connected ( call each other) for 5 minutes, and I believe you will have a "cooked egg"...However, as with the tobacco industry 40 years ago, profits mean a lot more than safety, so there continues to be studies showing no link to neural damage or incidence of brain tumors.
  • Do you need "Scientific Proof" to realize that a drink like normal Gatorade, with over 35 grams of sugar in a serving, will CAUSE insulin insensitivity and adult onset diabetes in many people that consume it regularly--believing it to be Healthy--you know they have "science" that shows it is hi tech nutrition/hydration :)
  • Science can be a wonderful tool, or , the worst form of prostitution. Each of us needs to apply common sense for "who has paid for the scientific studies", and who will "lose out" if a concern is ever "proven". Science in the 50's and 60's may have been mostly moral..Mostly.....Science today is more typically "bought and paid for", and any thought about morality, or rightness, or validity, will need to be investigated by each of us, not just assumed as in the old days. Thankfully we do have many great scientists today, but they are hidden by all the corporate lapdogs paid to prove whatever is asked of them.
Two well respected members of this forumn, indicated that the information my friend had on his website, regarding H2O Overdrive, was essentially voodoo, because it did not fit neatly into the type of research they like....

I have to say, as much as I respect both of these two posters, neither has trained hundreds of world class athletes, and very few in the world of sports and nutrition, can come any where near Terry Giles in the sheer volume of top placings for all the people he has trained.

My point here is that I know from my own first person observation, of thousands of people in gyms that Terry used to run, and the top athletes he used to train ( and create special custom diets for), that he knows far more than any other person I have ever met or spoken with, about sports nutrition....

When you call his comments "voodoo science", yet are completly unfamiliar with his product, that bothers me. Personally.
I can put 10 people on Overdrive right now, and 10 on Gatorade, and the results will be indisputable.

Moreover, the whole issue of the "beauty of science" in proving things....When I was a kid, highshool and college in the 70's, scientists were expected to be altruistic, and that they would work for the good of mankind....today, there is a large segment of the science world that are more like mercenaries, ready to do battle for money, and the cause is irrelavant. There are many great sceintists today, but there are so many mercenaries, that a "scientific study" proving almost anything , "can" be a joke...My examples above are on point to this, and I could add dozens, as I'm sure you guys could.

I think you should be trying something like Overdrive, before saying that is is voodoo science... The science you hold so dear, is supporting cell phones, aspartame, statins, and a dozen other products that you know are bad for people.
 
I just tested your cellphone claim. I took two cellphones, called one from the other, answered the call on the first, placed them on either side of an egg on the counter for 5 minutes. When I went to crack the egg, it is a good thing that I did do over a dish since the egg was unchanged. Your claim lacks reproducibility, which is the hallmark of real science. I encourage anyone else who is interested to also attempt to reproduce your claim and report their findings here, since so far we have an "N" of two, one positive and one negative.
 
I just tested your cellphone claim. I took two cellphones, called one from the other, answered the call on the first, placed them on either side of an egg on the counter for 5 minutes. When I went to crack the egg, it is a good thing that I did do over a dish since the egg was unchanged. Your claim lacks reproducibility, which is the hallmark of real science. I encourage anyone else who is interested to also attempt to reproduce your claim and report their findings here, since so far we have an "N" of two, one positive and one negative.

Thal, when I saw your post, it was lucky for me I wasn't drinking anything...:D:D

I was trying to make a point, not trying to put out a definitive piece on the dangers of cell phones.... a quick search turns up this:
Many organizations including the cell phone industry often downplay the risk of cell phone radiation to the brain. Results from short-term studies were used to convince consumers that use of a cell phone is not associated with brain tumors or cancer, which only develop decades after exposure.​
To be fair, no one knows exactly how much harm a cell phone can do to a person.​
Recently, new media has reported a study showing the radiation from cell phones is so full of energy they can be used to cook eggs.​
In the experiment, researchers placed one egg in a porcelain cup (because it is easy to conduct heat), and put one cell phone on one side and another cell phone on the other. The researchers then called from one cell phone to another and kept the cell phones on after connecting.​
During the first 15 minutes, nothing changed. After 25 minutes, however, the egg shell started to become hot and at 40 minutes, the surface of the egg became hard and bristled. Researchers found the protein in the egg had become solid although the egg yolk was still in liquid form. After 65 minutes, the whole egg was well cooked.​
The study shows how scary cell phone radiation is. People should try to avoid use of cell phones. Although so far no one has proved the radiation from cell phones can cause something clinically significant. By the same token, there has been no one who can disprove the existence of such a risk.​

In May, a branch of the World Health Agency called the International Agency for Research on Cancer declared cellphone radiation "possibly carcinogenic to humans." Now, some scientists are saying that certain types of cellphones could be more potentially carcinogenic than others.​
There is accumulating evidence that cellphones that operate on GSM networks (such as AT&T and T-Mobile) emit significantly more radiation than do cellphones operating on CDMA networks (such as Verizon and Sprint.) This is not immediately apparent from looking at a phone's specs, because phone companies are only required to list the "specific absorption rate" (SAR) -- a number that can be misleading, as it measures the maximum radiation a cellphone emits rather than the average amount of radiation it emits.​
According to Live Science:​
“Several recent studies have shown that CDMA phones normally emit a small fraction of their maximum radiation output, while GSM phones emit, on average, half the maximum ... The radiation spikes at the beginning of GSM phone calls means that they emit, overall, up to 28 times more radiation than CDMA phones ... n most parts of the country, where both CDMA and GSM towers are ubiquitous, CDMA phones will emit less radiation than GSM phones.”

Clearly some phones put out more radiation than others...Certainly, if some phones are bad, and others are not bad, the cell phone industry would try to use the good phones for all their testing, and avoid any tests that could make them look bad.


My point was not about phones...it is about how "real scientists" get paid by large corporations, to "prove" that bad things are good.
So much of this goes on, that when someone says that a "scientific study" shows something, this means almost nothing.
Of course, my relaying incomplete information about the egg test I had read about 4 years ago, did not help much, but I did not imagine that anyone would try it from the limited account of it I mentioned.....thank god it did not make a mess :D
 
No mess, the dog got the egg, she loved it, she thanks you. Time to replicate the full experiment, if just for my own edification, because I has a suspicion as to how they got the results that they did.

As an aside, I distrust pronouncements on the safety of microwave radiation in general and since Hawaii laws require hands-free cellphones in the car, I use various kinds of bluetooth adapters to keep them away from my squash ... the inverse square law at work.

But my point still stands, without reproducible, controlled studies, the claims for various products based on individual claims are B.S. What was it that someone said, the plural of anecdote is not data?
 
Anyway, getting back to post #1 & the possible implications of a high fat diet on nitrogen off-gassing, it appears that, at least to the extent such diet is related to elevated cholesterol & triglyceride levels, it may not be benign.

“Undersea Hyperb Med. 2013 Nov-Dec;40(6):487-97.

The influence of high-fat diets on the occurrence of decompression stress after air dives.

Kaczerska D1, Siermontowski P2, Olszański R2, Krefft K3, Małgorzewicz S4, Van Damme-Ostapowicz K4.

Author information 1Department of Clinical Nutrition, Medical University of Gdańsk, Poland.2Department Maritime & Hyperbaric Medicine, Military Institute of Medicine, Gdynia, Poland.3Department of Physics and Biophysics, Medical University of Gdańsk, Poland.4Department of Integrated Medical Care, Medical University of Białystok, Poland.

Abstract

INTRODUCTION: In hyperbaric air exposures, the diver's body is subjected to an increased gas pressure, which simulates a real dive performed in water with the presence of hydrostatic pressure. The hyperbaric effect depends on pressure, its dynamics and exposure time. During compression, physical dissolution of inert gas in body fluids and tissues takes place. The decompression process should result in safe physiological disposal of excess gas from the body. However, despite the correct application of decompression tables we observe cases of decompression sickness. The study aim was to find factors affecting the safety of diving, with a particular emphasis on the diet, which thus far has not been taken into account.

METHODS: The study subjects were 56 divers. Before hyperbaric exposure, the following data were collected: age, height and weight; plus each divers filled out a questionnaire about their diet. The data from the questionnaires allowed us to calculate the approximate fat intake with the daily food for each diver. Moreover, blood samples were collected from each diver for analysis of cholesterol and triglycerides. Hyperbaric exposures corresponded to dives conducted to depths of 30 and 60 meters. After exposures each diver was examined via the Doppler method to determine the possible presence of microbubbles in the venous blood.

RESULTS AND DISCUSSION: Decompression stress was observed in 29 subjects. A high-fat diet has a direct impact on increasing levels of cholesterol and triglycerides in the blood serum. A high-fat diet significantly increases the severity of decompression stress in hyperbaric air exposures and creates a threat of pressure disease.”
 
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