Ask any athlete what causes the burn during a hard effort and you'll hear the same answer: lactic acid. But here's the thing — that answer is mostly wrong. Lactic acid has been misunderstood for decades, and clearing up the confusion can actually change how you train and compete.
The Myth of Lactic Acid
For most of the 20th century, sports scientists blamed lactic acid for muscle fatigue and the burning sensation during intense exercise. The theory was simple: hard exercise produces lactic acid, lactic acid makes muscles acidic, acidity causes fatigue. Intuitive, but incomplete.
Modern research has significantly revised this picture. Lactate — the actual molecule produced during exercise — is not the villain it was made out to be. In fact, it's a fuel source. Your muscles, heart, and brain can all use lactate as energy, and elite athletes are actually better at producing and utilizing it than recreational athletes.
So What Actually Causes the Burn?
The burning sensation and fatigue you feel during high-intensity efforts is primarily driven by hydrogen ion accumulation. When your muscles produce energy anaerobically, hydrogen ions are released as a byproduct. These ions lower the pH inside your muscle cells — making the environment more acidic — which disrupts enzyme function and impairs muscle contraction.
Lactate production actually happens alongside this process, which is why the two got conflated. But lactate itself isn't causing the problem — the hydrogen ions are.
Why This Matters for Your Training
Understanding the real mechanism of fatigue changes your approach in two ways:
First, lactate threshold training works differently than you think. When coaches talk about training at your lactate threshold, they're really training your body to produce and clear hydrogen ions more efficiently — not to avoid lactate. Threshold work raises the intensity at which acid accumulation becomes a limiting factor.
Second, buffering hydrogen ions is a legitimate performance strategy. Since hydrogen ions — not lactate — are the primary driver of acidic fatigue, anything that helps neutralize them can extend your performance window. This is exactly where sodium bicarbonate comes in.
Where Sodium Bicarbonate Fits
Sodium bicarbonate is a natural buffer. It helps neutralize excess hydrogen ions in the blood, keeping pH in a more optimal range during intense efforts. The result is a wider window before acid accumulation degrades your performance — more time at high output before the wheels come off.
2% Performance Cream delivers sodium bicarbonate transdermally, bypassing the GI issues that come with oral loading. Same buffering mechanism, none of the stomach problems.
The Bottom Line
Lactic acid isn't your enemy — it's actually a fuel. The real culprit is hydrogen ion accumulation, and that's a problem you can directly address through smart training and targeted supplementation.
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