7

votes

Is it weird that after a 40hour fast I feel like running?

Answered on August 19, 2014
Created June 10, 2012 at 7:03 AM

So this is the first fast I've done over 24hours and I'm at the 40 hour mark and I have this great surge of energy and really feel like running. Does anyone else get that? Is it an ok idea to go for a run?

I also actually have great mental clarity and I feel so light...it's so strange. I always thought that fasting would leave me sluggish and lethargic but I'm experiencing quite the opposite...anyone else??

F8f38dfefde197df8ac1782ab6e65a60

(220)

on June 13, 2012
at 01:45 AM

My lecturer said that muscle glycogen is not involved in the contribution of maintaining a blood sugar at rest. It is really only used for physical exertion, the body doesn't want to use it as it is for emergency eg: running from a tiger. However, you are correct to say that liver glycogen would be depleted.

4ff24fb9a7d48305681487dfb8040a5e

(383)

on June 12, 2012
at 08:43 PM

Yes, please and come share with me the prey ;)

3b3a449b6705e9ec8b141d0bd07c1a64

(1489)

on June 11, 2012
at 09:26 PM

Is that a bad thing then? Can cortisol ever be good? It powers you to get things done...

3b3a449b6705e9ec8b141d0bd07c1a64

(1489)

on June 11, 2012
at 09:26 PM

ok i'll sharpen my spears :)

Fb67dc30cead043d1d13ea503a3044dc

(3280)

on June 10, 2012
at 10:53 PM

Yeah, your body wants you to go hunt something, stat!

5ef574d7893bc816ec52e04139e9bc09

(6097)

on June 10, 2012
at 04:21 PM

Yeah it's just cortisol.

3b3a449b6705e9ec8b141d0bd07c1a64

(1489)

on June 10, 2012
at 04:11 PM

hey raydawg seriously...it's crazy how good I felt after :S totally unexpected!

A1a0baccef58499acf9ceb3c874997f2

(675)

on June 10, 2012
at 04:10 PM

Your body wants you to go hunting!

96440612cf0fcf366bf5ad8f776fca84

(19463)

on June 10, 2012
at 02:53 PM

That's awesome! Maybe I should try a 40h fast. I've only done 16-18 hour IFs.

Ae8946707ddebf0f0bfbcfc63276d823

(9402)

on June 10, 2012
at 12:19 PM

Wouldn't carb stores already be gone after 40 hour fast?

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4 Answers

2
950efde057e2cc301543059b15f44374

(240)

on June 10, 2012
at 11:56 AM

Effects of a release of cortisol perhaps due to the stress of fasting? If it was due to a surge of cortisol, I wonder if that means your blood sugar level went up as well. Similar has happened to me, but I don't have a blood sugar machine to track my levels. Anyone else?

5ef574d7893bc816ec52e04139e9bc09

(6097)

on June 10, 2012
at 04:21 PM

Yeah it's just cortisol.

3b3a449b6705e9ec8b141d0bd07c1a64

(1489)

on June 11, 2012
at 09:26 PM

Is that a bad thing then? Can cortisol ever be good? It powers you to get things done...

1
4ff24fb9a7d48305681487dfb8040a5e

(383)

on June 10, 2012
at 07:29 AM

In paleolithic times you would have been in need of this energy and clarity to be able to successfully hunt after having had to fast for 40 hours :). Makes sense to me.

Fb67dc30cead043d1d13ea503a3044dc

(3280)

on June 10, 2012
at 10:53 PM

Yeah, your body wants you to go hunt something, stat!

3b3a449b6705e9ec8b141d0bd07c1a64

(1489)

on June 11, 2012
at 09:26 PM

ok i'll sharpen my spears :)

4ff24fb9a7d48305681487dfb8040a5e

(383)

on June 12, 2012
at 08:43 PM

Yes, please and come share with me the prey ;)

0
F8f38dfefde197df8ac1782ab6e65a60

on June 10, 2012
at 07:51 AM

Yeh probs just from evolution that we needed the energy to hunt and become alert for food. Id say go for a run or a sprint but dont go for so long that you use all your Carbs stores.

Ae8946707ddebf0f0bfbcfc63276d823

(9402)

on June 10, 2012
at 12:19 PM

Wouldn't carb stores already be gone after 40 hour fast?

F8f38dfefde197df8ac1782ab6e65a60

(220)

on June 13, 2012
at 01:45 AM

My lecturer said that muscle glycogen is not involved in the contribution of maintaining a blood sugar at rest. It is really only used for physical exertion, the body doesn't want to use it as it is for emergency eg: running from a tiger. However, you are correct to say that liver glycogen would be depleted.

0
01adafcb4dd4147c6af543f61eee60a8

on June 10, 2012
at 07:36 AM

Iv just completed a run lasting almost 2hours,after a 25hr fast. Never done a 40hr one though but if you feel good go for it.

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