Thibaudeau’s approach often prioritizes myofibrillar hypertrophy —the actual thickening of the muscle fibers—which leads to denser, stronger muscles compared to the "fluid-filled" look of pure sarcoplasmic training.
Muscle fibers are organized into "motor units." To move a weight, your brain sends signals to these units. According to the , your body recruits smaller, low-threshold fibers (built for endurance) first. High-threshold motor units (HTMUs) are only called upon when the demand for force is high or when smaller fibers become too fatigued to continue. Christian-Thibaudeau-High-Threshold-Muscle-Buil...
Thibaudeau emphasizes that you don't always need to lift heavy to hit these fibers, though it is one of the most effective ways. There are two primary methods to trigger HTMUs: High-threshold motor units (HTMUs) are only called upon
Even with lighter weights, the intent to accelerate the bar as fast as possible forces the nervous system to engage HTMUs. The faster you try to move a weight, the more "high-threshold" your training becomes. Key Pillars of the System The faster you try to move a weight,