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Re: [pct-l] potassium

Are there any vitamins that are really depleted during heavy physical
exertion? We take multi vitamins, but otherwise eat pretty badly and have
always done fine.

On Mon, 20 Mar 2000 01:23:47 -0800 Brick Robbins <brick@fastpack.com>
> At 03:00 PM 3/19/00 , PCTResearch <pctresearch@pcthiker.com> wrote:
> >  But sodium is not the main
> >mineral lost in sweat, potassium is the one to watch for.
> Wrong, but a common mistake, often repeated. Here is a research 
> report excerpt 
> ==begin excerpt==
> The NaCl  lost over three hours of exercise and the complete 
> restoration of the fluid and electrolyte losses in three hours of 
> exercise can only be achieved by the consumption of ~10 g of NaCl in 
> food over a 24 hr period.
> Potassium is the major intracellular ion and is lost from the body 
> in sweat and urine during exercise. However these losses are small 
> (<1 gm even during very prolonged exercise) and are replaced by the 
> normal daily dietary intake of 2-4 g. There is no evidence that 
> potassium supplementation is required by the physically active.
> ==end excerpt==
> Report from the World Forum on Physical Activity and Sport, Quebec 
> City, Canada 19th 21st May, 1995
> http://www.fred.net/ultrunr/noakes.html
> >Sodium is generally not a problem because of all the processed and 
> packaged
> >foods that make up a good portion of our trail diet are generally 
> high is
> >sodium. 
> Inadequate sodium can be a very big problem in the SoCal region, and 
> is why electrolyte replacement drinks (gatoraide, etc)are essential 
> in that section. Inadequate salt intake can cause swelling in the 
> extremities which often leads to blisters as well as a host of other 
> problems.
> http://www.fred.net/ultrunr/hyponatremia.html
> Eat lots of salt on the lots of food you will be eating
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