An acute physiological shift characterized by a net positive protein balance, where the rate of synthesis exceeds the rate of degradation within tissues like skeletal muscle and bone. This state is hormonally mediated and essential for adaptive remodeling, recovery from physical stress, and the accrual of functional mass. Clinical practice aims to strategically activate this state to enhance tissue health and improve long-term physical capacity.
Origin
The term is grounded in the fundamental metabolic division of anabolism (building up) and catabolism (breaking down), which are derived from Greek roots. ‘Activation’ signifies the transition from a baseline or catabolic state to a predominantly synthetic phase, a core concept in exercise physiology and clinical nutrition. Understanding this metabolic polarity is crucial for therapeutic interventions in aging and chronic disease.
Mechanism
Activation is primarily triggered by an interplay of nutrient availability, especially amino acids, and the pulsatile release of anabolic hormones such as growth hormone, testosterone, and insulin-like growth factor-1. These signals bind to specific receptors, initiating intracellular cascades like the Akt/mTOR pathway, which directly stimulates protein translation machinery. This coordinated hormonal and nutritional stimulus drives the cellular machinery toward repair and hypertrophy.
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