"bikeme" <[email hidden]> wrote
Quoted message said:This has happened to me twice now. Last year at the Richmond Suntrust
Marathon, I began getting muscle cramps (both legs- several muscles) after
mile 15. It was so bad that I had to do a run/walk/run/walk combo,
continually massaging out the cramps.
This is what happens to me and a lot of people when one sweats out more than
5% of one's body weight. The cramps would have stopped within a few minutes
if you'd been able to drink (and absorb) a quart or two. In my last ultra,
I started cramping after 5 hours; I drank 50 oz of gatorade and water over
the next 10-15 minutes (along with two Succeed salt capsules), and they went
away very quickly.
I learned this the hard way in ultramarathons -- it took me almost two years
to realize that I needed to drink much more than the average person.
Quoted message said:I did sweat quite a bit out there. My face was salt-crusted by the time I
finished.
My guess is that you were probably down 8+ lbs. Sweat contains about a gram
of sodium per liter. You lost a lot of salt, too (see below).
Here's the summary:
1. Weigh yourself before and after runs and races. You should be down no
more than a 2 lbs or so after two hours (due to glycogen consumption). Any
more than this means you're dehydrated.
2. One lb of water is 1 pint.
3. Do the math and figure out how much you should be drinking when working
hard, and under various conditions. I drink 40 oz per hour, on average,
when I race in the sun. My record is 70 oz in a one hour climb at 95
degrees.
4. Train, even on shorter runs to drink this frequently so that it is
second nature and the body is used to it on race day. I typically drink
half of a standard 20oz squeeze bottle every 15 or 20 minutes, for example.
4.1 Drink per your plan on race day -- it's easy to get caught up in the
competition and the go-go attitude everyone has in the first 1/3 of a race,
and forget about hydration.
5. The body sweats out about 600 mg of sodium per pint (or lb) that you
sweat. This salt loss adds up, and causes problems (hyponatremia in the
extreme case).
6. How the gut absorbs liquid: You need sodium to promote quick stomach
draining. The body actually has to pump sodium into the gut to enable
water to be absorbed. When you get dehydrated, you've also lost a fair
amount of salt (note your salt-encrusted face). When you're low on salt
(after sweating many lbs), the body is reluctant to put salt into your gut.
So the water sloshes around quite a while and is absorbed very slowly.
The result is that the more dehydrated you are, the slower your stomach
drains -- not a good thing. You need to rehydrate, but the full stomach
suppresses your thirst and even promotes nausea.
7. Taking one Succeed cap (which has 650 mg of Sodium -- nfi) with every
16-20 oz bottle will let your stomach drain very quickly. If your stomach
is sloshing, take salt!
8. If you get your hydration and sodium plan in sync with your needs,
you'll only weigh a couple of lbs less at the end of your races, and
voila--no cramps.
-- Dan