Peak week makes or breaks a physique. Months of brutal deficits and precise periodization can be wiped out in 48 hours by superstitious manipulation—cutting sodium completely, dropping water to zero, or slamming thousands of unmeasured carbohydrate grams the night before stepping under stage lights.

​A successful peak does not rely on magic. It relies on fluid dynamics, glycogen storage physiology, and maintaining intracellular osmotic pressure.

​1. The Biology of Glycogen Supercompensation

​The primary objective of carbohydrate loading is maximizing intramuscular glycogen stores to push muscle bellies against the skin, creating a full, 3D appearance while pulling subcutaneous fluid inward.

​The 3:1 Water-to-Glycogen Ratio: Every single gram of glycogen stored in muscle tissue binds approximately 2.7 to 3.0 grams of water.

​Intracellular vs. Extracellular Water: Water inside the muscle cell (intracellular) creates fullness and hardness. Water outside the cell (subcutaneous/extracellular) obscures definition. Because glycogen storage occurs strictly inside skeletal muscle, loading carbohydrates acts as an internal sponge, drawing ambient extracellular fluid straight into the muscle belly.

​The Loading Rate:

​A standard loading phase typically utilizes 6 to 8 g of carbs per kilogram of lean body mass across the front-load days (usually Wednesday/Thursday for a Saturday show), tapering slightly into Friday to assess fullness.

​Rapid back-loading (shoving 800g of carbs in on Friday night) often overwhelms gastric emptying, causes digestive fermentation, and leads to abdominal distension.

​2. Dispelling the Sodium-Cutting Myth

​The practice of dropping sodium to zero days before a show remains one of the most persistent, damaging mistakes in competitive prep.

Why Sodium Depletion Ruins Conditioning:

​1. The Aldosterone Rebound: When sodium intake abruptly drops, the adrenal cortex responds by secreting aldosterone. Aldosterone forces renal tubules to scavenge and retain every trace of sodium and water, pushing fluids into the subcutaneous space.

​2. Loss of Vascularity and Pump: Sodium maintains blood plasma volume. Cutting salt drops blood pressure, impairs muscular pump backstage, and leaves veins flat.

​3. Impaired Glucose Transport: Intestinal glucose absorption relies on SGLT-1 (Sodium-Glucose Linked Transporter 1). Without sodium present, carbohydrates cannot efficiently pass from the gut into the bloodstream to reach muscle tissue, triggering gastrointestinal distress and bloating instead of muscle fullness.

​The Protocol: Keep sodium stable at your normal baseline (3,000–5,000 mg daily depending on size and climate) straight through peak week. Minor adjustments can be made on show day, but baseline sodium should never be removed.

​3. Water Manipulation Timelines

​Muscles are roughly 70–75% water. Attempting to dry out by severe water restriction deflates muscle volume far faster than it clears subcutaneous moisture