Bicarbonate of soda isn't an actual soda

, it can be used as a pH buffer however.
As when consumed (I have read 0.3g per kg of bodyweight) an hour before the exercise it resists changes in the pH level of your muscles. This is one of the main limitations of your muscle called acidisosis of the muscles (don't quote me on that) which can drop your pH level a great deal. So basically they reach a point where they can't operate, hence the burning feeling when your doing those punch out drills, or hill sprints. Buffering will halt the on set of this, don't really want to get into the chemistry of it (just had an exam on this stuff today

). I might give it a try one day although don't really want to be eating 20grams of that stuff, would be horrible.
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