1

votes

Why would my fasting blood glucose level go up post-exercise?

Answered on August 19, 2014
Created August 27, 2012 at 3:50 PM

Hi guys,

I have been doing Intermittent Fasting, and testing my glucose levels with a blood monitor throughout the day. I noticed today, my fasting level in the morning (9am) was 85. I did a high intensity 30 minute exercise, and halfway through tested by glucose level, still 85 (at 10:45am). Then, 45 minutes after my exercise (but still without eating anything, just coffee), I tested my glucose level again---99.

Why would my glucose level go UP post exercise, but pre eating?

Thanks!

34cf7065a6c94062c711eb16c0f6adc3

on August 28, 2012
at 10:17 AM

I would think that liver insulin resistance may also play a role. If it is working normally liver should provide glucose to keep the level normal. If it is not, the level when it dumps might be quite a bit lower and the dump larger. So you get a delayed large rise for intense exercise. While you would get a lowered blood glucose for slow intensity longer exercise.

211d4075d68b24cd0aa7ebfa94262bb9

on August 27, 2012
at 05:35 PM

Exactly. High intensity exercise can elevate blood glucose for several hours afterwards, whereas moderate or low intensity exercise generally lowers blood glucose.

27bac964edd249667d0fb749daeeb090

(263)

on August 27, 2012
at 05:35 PM

True! i notice this all the time because I am a type 1 diabetic. Although my sugar shoots up a bit more (since I can't regulate my blood sugar without injecting insulin. I'll go up to about 120-130 after an intense crossfit workout.

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2 Answers

8
510bdda8988ed0d4b0ec0b738b4edb73

(20888)

on August 27, 2012
at 03:57 PM

Your liver released glycogen as glucose into your blood to help fuel your exercise. This is a common reaction to intense work.

211d4075d68b24cd0aa7ebfa94262bb9

on August 27, 2012
at 05:35 PM

Exactly. High intensity exercise can elevate blood glucose for several hours afterwards, whereas moderate or low intensity exercise generally lowers blood glucose.

27bac964edd249667d0fb749daeeb090

(263)

on August 27, 2012
at 05:35 PM

True! i notice this all the time because I am a type 1 diabetic. Although my sugar shoots up a bit more (since I can't regulate my blood sugar without injecting insulin. I'll go up to about 120-130 after an intense crossfit workout.

34cf7065a6c94062c711eb16c0f6adc3

on August 28, 2012
at 10:17 AM

I would think that liver insulin resistance may also play a role. If it is working normally liver should provide glucose to keep the level normal. If it is not, the level when it dumps might be quite a bit lower and the dump larger. So you get a delayed large rise for intense exercise. While you would get a lowered blood glucose for slow intensity longer exercise.

1
B8592e62f9804ddabae73c1103d6bcb9

(1956)

on August 27, 2012
at 04:48 PM

It's called adrenaline, and it raises blood glucose.

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