Running 50km after 82h of fasting • Hacker News Board

Re: Running 50km after 82h of fasting

#121

Post by js2 » Wed, Jan 20, 2016, 10:31 PM UTC

xavivives wrote: post #113

js2 wrote: post #106

Earlier quoted context omitted.

Still, it might have been interesting to have your blood work done before and after to see what the changes were. There's compelling evidence for fasting. See Micheal Mosley's Eat, Fast and Live Longer documentary: https://vimeo.com/103656060 Personally, I'm following a 5:2 intermittent fast this year while also maintaining 63 mi/week running, including 9 mi on the days I fast.

True. I'll try to get a blood test next time. What are you guys recommendation on what to check?

I am not a doctor. You should definitely talk with a doctor. But, you can google for "health blood markers" which typically includes measuring cholesterol and glucose to start with. For example:

http://www.marksdailyapple.com/blood-test-markers/

http://circ.ahajournals.org/content/107/3/499.full

https://labtestsonline.org/understanding/analytes/cardiac-ri...

Also, it's probably not a bad idea to measure your blood pressure regularly which you can easily do at home.

Re: Running 50km after 82h of fasting

#122

Post by DrScump » Wed, Jan 20, 2016, 11:44 PM UTC

brianwawok wrote: post #120

DrScump wrote: post #110

Earlier quoted context omitted.

"high intensity" is sprinting , not distance running.

Well you are burning quite a few more carbs than fat even at a fast 1/2 or full marathon. Not sure exact switchover from more carbs to more fat is, maybe 5 or 6 hours?

"Well you are burning quite a few more carbs than fat even at a fast 1/2 or full marathon"

No, you aren't. Your liver can hold only so much glycogen, and you'll use that up well before the 10-mile mark.

Re: Running 50km after 82h of fasting

#123

Post by zimpenfish » Thu, Jan 21, 2016, 11:26 AM UTC

DrScump wrote: post #122

brianwawok wrote: post #120

Earlier quoted context omitted.

Well you are burning quite a few more carbs than fat even at a fast 1/2 or full marathon. Not sure exact switchover from more carbs to more fat is, maybe 5 or 6 hours?

"Well you are burning quite a few more carbs than fat even at a fast 1/2 or full marathon" No, you aren't. Your liver can hold only so much glycogen, and you'll use that up well before the 10-mile mark.

http://www.ncbi.nlm.nih.gov/books/NBK22417/ suggests that an elite athlete (they're talking about 2 hour marathons) could fuel about 1:20 of that with glycogen (~18 miles) but that they burn about equal glycogen/fat (which would give 13 miles of glycogen.)

I suspect your 10 mile mark is probably correct for anyone below "almost-elite".