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Running 50km after 82h of fasting

blog.xavivives.com

11–20 of 123 posts

Re: Running 50km after 82h of fasting

#11

Author looks like he doesn't even lift. Opinion discarded. PS: To the people scouting his blog. Do yourselves a favor and research catecholamines and the role of stress hormones before taking his advice on performing a single meal a day under what happens to be a caloric deficit scenario. Guy has a long way to go in terms of nutrition and sports performance.

The only "conclusion" presented at the link is that the author successfully completed the race after fasting.

Re: Running 50km after 82h of fasting

#12

Author looks like he doesn't even lift. Opinion discarded. PS: To the people scouting his blog. Do yourselves a favor and research catecholamines and the role of stress hormones before taking his advice on performing a single meal a day under what happens to be a caloric deficit scenario. Guy has a long way to go in terms of nutrition and sports performance.

Indeed, he should post his testosterone, cortisol, and adrenaline levels and the time of day they were taken. People who act like this is clear-cut are very silly and have little experience in biology and medicine.

Re: Running 50km after 82h of fasting

#13
post #4
post #2

I'm not sure if this is pseudoscience or anecdata but I'm sure I could find six doctors saying that this is a horrible idea. From the post: "I couldn’t find any publication about ultra distances and significant amount of fasting." This is not a medical study. This is an individual and could be anything from simply dumb and dangerous to body dysmorphia. Not everything can be safely hacked, friends.

The only fundamental difference between this and a 'proper' scientific experiment is the p value. All scientific experiments have cavets, and all have a probability their finding could be erroneous. Of course, no one should write a textbook based on this one guys self-reported experience. But, assuming he is accurately reporting it, it is evidence that this is _possible_ which is a very important thing to discover. Y…

A proper medical study also has doctors monitoring for any risks. They would run blood work and check for anything wrong - it's hard for one person to draw conclusions about how healthy this is if he wasn't baselining and monitoring different vital statistics (liver enzymes, etc.)

Also, everyone's body is different: he may just be a genetic freak who is able to do this. Especially with heath/body claims, be very wary that one person's results will be able to transfer to anyone else.

Re: Running 50km after 82h of fasting

#14
post #8

While this may be possible, I would worry about the effects on your liver. Ketosis does put additional strain on the liver, and while it doesn't seem like the side effects of extended ketosis are dangerous, there simply aren't any studies on ultra-endurance exercise during ketosis. And while studies on extended exercise during ketosis would be a good thing, they should be performed by researchers and doctors who know…

I link a small study of endurance athletes performance while in ketosis in another comment.

Re: Running 50km after 82h of fasting

#15
post #8

While this may be possible, I would worry about the effects on your liver. Ketosis does put additional strain on the liver, and while it doesn't seem like the side effects of extended ketosis are dangerous, there simply aren't any studies on ultra-endurance exercise during ketosis. And while studies on extended exercise during ketosis would be a good thing, they should be performed by researchers and doctors who know…

Please cite your sources. It's certainly possible that it's dangerous, but there is also a tradition of labeling anything which is different than what was historically done as medically dangerous. There is an equal tradition of pulling the medical dangers of various things out of thin air based on guesswork. It is of course possible, I am very interested in reviewing your sources.

Re: Running 50km after 82h of fasting

#16
The whole blog feels like a confused agenda masquerading as hand-wavey pseudo-science. Do not like.

Ketosis is really quite well studied at this point, I don't really think this adds anything to the mix. Also why conflate fasting and ketogenics?

Re: Running 50km after 82h of fasting

#18
post #5

I've seen people die running a half marathon. Please don't push your body to the breaking point just for giggles. Work your way up.

I think you have to think about how those people died. Heat exhaustion? An underlying heart condition? I don't think they died of not having enough nutrients, or not eating soon enough before running.

Re: Running 50km after 82h of fasting

#19

Author looks like he doesn't even lift. Opinion discarded. PS: To the people scouting his blog. Do yourselves a favor and research catecholamines and the role of stress hormones before taking his advice on performing a single meal a day under what happens to be a caloric deficit scenario. Guy has a long way to go in terms of nutrition and sports performance.

You can't really expect to find people that look like gym rats doing these types of races.

Re: Running 50km after 82h of fasting

#20
post #10
post #4

Earlier quoted context omitted.

The only fundamental difference between this and a 'proper' scientific experiment is the p value. All scientific experiments have cavets, and all have a probability their finding could be erroneous. Of course, no one should write a textbook based on this one guys self-reported experience. But, assuming he is accurately reporting it, it is evidence that this is _possible_ which is a very important thing to discover. Y…

Nonsense. A proper scientific experiment would have controls and independent results and medical oversight and calibrated measurement equipment and a clear definition of what's attempting to be proved. This is a guy fooling around and blogging for attention. Dangerously so. p=1, no scientific method = anecdata. His conclusions? Pseudoscience. It's dangerous to him personally and it's damaging to society broadly to pr…

He has gathered more data than had he not done it, or not blogged about it. You're right that it doesn't meet any scientific criteria for 'fact' yet, but it is data of a sort, and may be a helpful step on the road to the furtherance of science.
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