Alkoholkonsum – Fakten und Mythen

Alcohol is unequivocally not an ally of physically active individuals. Anyone embarking on an athletic journey or striving for optimal training performance must recognize its systemic repercussions. Here is how alcohol impacts physiology and what consequences active individuals should anticipate:

• Reaction Time and Motor Coordination: Alcohol acts as a central nervous system depressant, decelerating neural transmission in the brain. This significantly prolongs motor reaction time, impairs neuromuscular coordination, and compromises dynamic balance and proprioception.
• Dehydration: Alcohol suppresses vasopressin (antidiuretic hormone) secretion, precipitating pronounced diuresis. Compounded by sweat-induced fluid and electrolyte loss during exercise, this leads to systemic dehydration, reduced plasma volume, and premature muscular cramping and fatigue.
• Testosterone Suppression: Ethanol intake directly impairs testosterone biosynthesis in testicular Leydig cells. Because testosterone is a paramount anabolic hormone driving muscle protein synthesis (MPS), its attenuation curtails lean muscle accrual and strength adaptations.
• Compromised Sleep and Recovery: Muscular remodeling and hypertrophy occur primarily during deep slow-wave sleep. Alcohol disrupts sleep architecture, fragmenting sleep cycles and suppressing the nocturnal pulsatile release of growth hormone (GH) and melatonin, preventing proper tissue repair.
• Adipose Tissue Accumulation: Delivering 7 empty kcal per gram, alcohol halts hepatic fatty acid beta-oxidation, prioritizing acetate metabolism and accelerating fat storage—particularly when combined with energy-dense social meals.