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03 November 2005

Random workout/medical question: Are you more likely to end up with exercise induced low blood sugar in the evening than in morning?[More:]

So yesterday I went to swim practice & had to get out about twenty minutes after beginning due to low blood sugar (as indicated by shaking). I hadn't eaten since one and it was about 7.30. However, when I practice in the mornings, I don't eat beforehand and am fine. Is there an actual reason for this? Also, why does having low blood sugar make you pee a lot?
When you wake in the morning, you still have some "reserve" on board, as sleep uses relatively less blood glucose than activity does.

If you get hypoglycemic, your circulatory system makes adjustments to ensure that your vital organs get the best circulation. That includes increased circ. to your kidneys. Anything that causes increased circulation to the kidneys means that more water goes through the kidney filtering system, resulting in a fuller bladder. The same thing happens when a person goes from a warm to a cold environment.. all of a sudden, you have to pee.

If you get hypoglycemic often, it's smart to carry one of those little "cake frosting decorater" tubes that you can buy at the market. They're about 2.5 inches long and are used for "writing" on decorated cakes. Colour of the frosting doesn't matter, it's just a waterproof container of sugar. If you lost conciousness, someone could lay a bead of the frosting along your upper gum line and help you.
posted by reflecked 03 November | 17:16
Maybe you shake in the evening because you've been awake and using muscles all day and they get tired more easily.

I wonder, but won't go so far as to assert because it would involve reading about something I've studied but in the past, if the term hypoglycaemia isn't bandied about much much more than it should be or is relevant, kind of thing.

You have a bunch of mechanisms that keep your blood sugar between 4 and 7 on a scale. You eat more, release more insulin, break down protein, build up and break down sugar stores and fat and muscle and round it off with a bunch of other influencing hormones. It's very complex. Very.

So whether you eat or not, whether you exercise or not, whether you sing volare in swahili naked on an open topped double decker bus in London, your blood sugar stays between 4 and 7 units (unless you've got specific diseases like diabetes or pancreatic cancer or something of that ilk).

And maybe you personally hit 4units sometimes and that makes you a bit giddy/tremory. Eat something light 45mins before working out and see if there's a diff.

Hypogly and peeing? Never knew that. I know hypergly makes you drink more and get dehydrated...gah, my memory fails me. I am almost sure that more peeing is not associated with a low blood sugar level. I would be open to correction but I'm reasonably sure. 97.6% sure. Maybe you drink more? And you increase your metabolic rate by exercising so you are turning over everything a bit quicker thus leading to more urine production....I think - again, depends on adequate hydration, being well, other hormones dee dah dee daaaaah
posted by peacay 04 November | 08:13
eh.. Peacay.

:D You're thinking like a scientist again. "Hypoglycemia" has made itself into the common language and pretty much means (except at the clinical level) that a person is symptomatic when their fuel reserves are running low.

When someone gets pale, shaky, foggy, then passes out, it makes no difference that they're at 4.5. They need some form of fast glucose, and then a light carb snack as soon as they can chew and swallow.

Anything that makes a person pale (signifying in this case circulatory adjustment by arterioles, directing .. in this case.. more glucose the brain, can result in a fuller bladder. I can't tell you how many times I've walked into a hospital room, found someone (usually a hospitalized diabetic) unconcious, determined a critically low blood sugar, injected D10W, got them sorted, then changed their bedding because there was incontinence associated with the episode. I personally have experienced the "low on fuel" shakes and also felt like all-of-a-sudden Idesperately needed to pee.


heh I blather.

Dame's gonna eat lightly a short while before she exercises from now on, I'm sure.
posted by reflecked 04 November | 14:53
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