2.1 The Core Driver: High Levels of Mechanical Tension
For decades, the pursuit of muscle growth has been clouded by an overemphasis on the weight on the bar. While heavy loads are one powerful tool for generating the primary stimulus, they are not the stimulus itself. The true biological trigger for the mechanotransduction cascade described in Chapter 1 is mechanical tension, but only when that tension is of sufficient magnitude and acts upon the muscle fibers with the greatest growth potential. This section dissects the precise interplay between motor unit recruitment, effort, and the force-velocity relationship that governs whether a rep is truly stimulating.