I get this too.   Others will correct if necessary, but I think exercise
stimulates the liver to generate more glucose to meet the increased demand
for energy.   The glucose can't get into the muscle cells untill there's
enough insulin and in diabetes this takes longer to happen.   Net effect,
glucose concentration in the blood increases.   But, on the plus side it
comes down faster because of the exercise and this effect persists for
several hours.   On balance exercise is a VERY good thing.

Peter

Normal, yes. You use up sufficient glucose that your liver panics and dumps
some glucose into your bloodstream. 20 points is not bad - my BG used to
double if I exercised in the morning, so I didn't. Doesn't look like you
need to change your exercise time.

Nicky.

My bg is often very high after a run, but it comes down in a reasonable
time. I'm not about to give up running before my feet & legs & so on make
me, and since I like doing races I can't always choose the time (most are in
the morning, but some are in the evening in the summer).

I just figure that on the whole I'm doing myself good.
bj

James E. wrote in message ...

   Another way to look at it:   Exercise is stress;  your body reacts to
stress by generating hormones which "order" your liver to release glucose.
There are a host of other stressors with the same effect.   You just don't
expect to see it after exercise.

In my case,  a short exercise period raises sugars,   a long exercise period
(~1 hour) lowers sugars  (though I inject insulin so it's a bit different
than your particular case)

Try walking longer.

Another thought:   the over-all effect of vigorous aerobic exercise for me
is a lowering of bG for about 20-24 hours.

Regards
 Old Al

That is just the opposite of my experience, James. When I go for a 30 minute
walk, I have noticed my BG is down by approximately 20 pts....

Also, my reading would suggest that when muscle cells are exercising, they
are somewhat capable of taking glucose directly from the bloodstream without
the intervention of so much insulin as they would require in the resting, or
sedentary, state.

Will, T2

Yes, but then the stored glucose in your liver deposited a
bit more into your blood because that's the way the body
works ;) Having a small high fibre carb snack with a bit of
fat and protein before the walk might help. Like a rye
cracker with cheese etc.

After I go for an aerobic 1/2 hour walk in
the morning, my bg goes up 20 points. I would have expected it to go
down
because my exercise used up glucose in my blood.

Is this normal? What are the dynamics of this?

Hi James,
At my diabetes class about excercise, the CDE stated that there are two
ways to "trick" the liver into not doing a dump.

She stated that you have to excercise for more than 15 minutes and to
start out slow so your body won't go into "heavy energy output" mode.

I take two walks every day and the first three to five minutes of my
walk are a easy little stroll, then I start to ramp it up.  I have
stumpy little legs so fast for me would probably be slow for anyone
else.  LOL

Anyway, this works for me -- I have taken a quick 30 minute walk when
my BG was too high and I managed to drop it by a full 50 points.

Hope this helps.  

Wendy in Louisiana

James,

I'm not actually diabetic, but definitely in the pre-diabetic camp. My
morning BG's are between 5-6. I still pass a glucose tolerance test.
I've been where I am on morning BG for some years now, and I just
maintain a close "watching brief" on the issue. Most of my usual meals
cause quite an acceptable BG surge, so I haven't needed any
substantial dietary changes.

I noticed when I went out on my "big" weekly shop, where I walked
about 10,000 steps in a morning that my BG went at 8 (!) for some 4-5
hours into the afternoon of the shopping day. I'd hardly ever get near
an 8 on one of my normal meals btw.

The other thing I noticed was I could eat a really high carb meal the
next night without hardly boosting my BG level at all. So, it seems
there are some substantial delayed benefits to exercise.

Trying to eat anything beforehand etc didn't have any effect on this
exercise induced BG surge for me. The benefits of exercise are so
obvious that I continue to do my weekly shop as usual. I walk as much
as I can every day.

Ross

(To get email address ROT 13)
ebff_qnyl@lnubb.pbz

A rise in glucose is normal after exercise. I noticed this effect
about 2001, a year after T2 Dx. The group's responses about your liver
generating glucose to fuel the muscle's additional needs during
exercise are correct. In the past 6 months, I verified the
cause/effect with 3 doctors. A general practitioner, a geriatric
diabetes specialist(talking to my elderly aunt's doc), and an
endocrinologist/diabetic specialist(first visit Mon 28th!).

However, different people get different results. My experience:

 65 -   75 mg/dl BG pre exercise goes to 105-110 post exercise.
150 - 170 mg/dl BG pre exercise goes to 100-110 post exercise.

The post BG test is after 1 to 2 hours intense exercise.  Note also,
the drop from 150-170 range to 100-110 in a couple hours post-BG test
is common for me without exercise.

Rich