RACE FUELING.
Your body only stores enough glycogen for roughly 90-120 minutes of hard effort. Once depleted, you "bonk" and your pace collapses. You must constantly drip-feed carbs to keep the engine running.
As you sweat, your blood volume drops. If you lose >2% of your body weight in fluid, your heart has to pump significantly faster to maintain the same power output (cardiac drift).
Sodium dictates how well your gut actually absorbs the water you drink. Without adequate sodium, water just sloshes in your stomach. It is also critical for maintaining muscle contraction and preventing cramps.
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* The gut cannot absorb more than 90-120g of carbs per hour without dedicated GI training. Always test your exact nutrition strategy in your longest training sessions before race day.