Respectable, though not spectacular, ultramarathon history.

http://statistik.d-u-v.org/...on.php?runner=284585

Just over 8 hours isn't bad for 100km on trail with 1300 metres of vert, though I'm assuming it isn't highly technical trail.

He's a bit off the pace in the Transgrancanaria 125km, (which has a much more competitive and deeper field, greater elevation and more technical trails), where he's finishing adrift of leading women.

Consuming and processing over 10k calories per day at the rate of over 400 per hour 24 hours a day is pretty freaky in and of itself.

It's the heart rate data I find impressive. Reeling off 3:20 marathon with an average HR of under 120. Sheesh

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Ever Grateful, Ever True.
Boiler Up.
Hammer Down.
Hail Purdue

Assuming 8 hr/night sleep, he'd need to average 625 cal/hr over the 16 waking hours. Where did you see the 10,000 cal/day??? I did not see any reference to his caloric intake on his web site, but 10,000-11,000/day sounds about right. He probably needed to consume a fair amount of high fat foods, just to get enough cals. :)

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"Anyone can be who they want to be IF they have the HUNGER and the DRIVE."

Yes - this.

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https://www.strava.com/...tes/zachary_mckinney

The "regular" Ironman nutrition plan goes out the window for these folks and anything edible is fair game.The diet of the continuous multi-Iron folks in freaking hilarious sometimes.
His sleep hours are listed in among all this data..
https://www.raitratasepp.ee/...disciplines-and-days

The burn rate at those paces and for IMs in general has him up at 10k+ per day, and doing 40 in a row means he can’t just perpetually lose significant amounts of weight, it almost all has to be replaced.

Certainly, he must replace almost all of his calories burned and 10,000 cal/day is a good estimate. I think you missed my main point though, which was/is that he isn't eating 24 hrs/day since he is sleeping at least 6-7 hr/nt, and probably lying down for 30-60 min more trying to sleep. Thus he is "only" eating around 16-18 hr/day. Minor point I know, but that is all. :)

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"Anyone can be who they want to be IF they have the HUNGER and the DRIVE."

Very interesting, thanks for that link. I'm a little surprised that he did not sleep more but perhaps he was too keyed up??? Or he's just not a big sleeper??? Perhaps I am "wired" differently but I am always falling asleep after just a long training day, let alone 40 iron distances in a row. I find all this fascinating but no way in hell will I ever attempt even 5 irons in a row. Now if the "iron distance" had a much longer swim and shorter bike, e.g. like the "IsoMan", I would be up for it. :)

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"Anyone can be who they want to be IF they have the HUNGER and the DRIVE."

.

If you get sleepy after long training days imagine this "next level" way of doing things.In the middle of your 5th straight Ironman lets go perform some emergency surgery...

https://www.dailymail.co.uk/...xvfFcur5EmF04PZ7WfAA

Ya, I remember seeing that article soon after that event. Doing emergency surgery is a bit different though, since he was certainly still pumped from the race. I'm referring to from feeling sleepy after a long training day followed by a good meal. I average around 9 hrs/night as a year-round average.

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"Anyone can be who they want to be IF they have the HUNGER and the DRIVE."

I hear ya. Indeed that is an insane rate. In my original post I was commenting on his body processing 24/7 at that rate which is above the rate of 300-400 per hour that is often cited as the most the human body can absorb, at least during events.

Ah, processing over 400 cal/hr over 24 hrs. Ya, for those 40 days and nights, he was not just a SBR machine but also a food processing machine. :)

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"Anyone can be who they want to be IF they have the HUNGER and the DRIVE."