After six weeks of resistance training with either low or high levels of fatigue, highly trained people did not gain more muscle mass or improve their power in leg exercises, even though they got...
Mechanism
Synthesis from 1 study
When strong lifters train until they slow down, their muscles get a little thicker in one spot and their nerves get better at firing hard — that’s why they get stronger. But their overall muscle size, jumping power, and leg press power don’t change because their bodies are already as efficient as...
Most probable mechanism
When highly trained people lift weights until they slow down a lot, their muscles recruit more fibers and build up chemical stress, which can make one muscle thicken a little. But because their bodies are already used to heavy training, this doesn’t lead to bigger overall muscles, stronger jumps, or more powerful leg presses — their nervous system just gets better at firing the same muscles harder, which makes them stronger without changing size or power output.
Resistance training to high levels of velocity loss increases neuromuscular fatigue, requiring greater recruitment of high-threshold motor units to maintain force production.
Increased recruitment of Type II muscle fibers elevates mechanical tension and metabolic stress within muscle tissue, activating intracellular signaling pathways that promote localized protein synthesis.
Localized protein synthesis leads to modest increases in muscle fiber cross-sectional area in specific muscles, such as the vastus lateralis, without triggering systemic muscle growth.
In highly trained individuals, the nervous system adapts to increased demand by improving motor unit synchronization and firing rate, enhancing maximal strength without requiring additional muscle mass.
Existing muscle mass and neuromuscular efficiency in trained individuals reach a threshold where further hypertrophy or power gains require stimuli beyond those provided by velocity-loss-based protocols, preventing changes in whole-body lean mass, leg press power, or squat jump performance.
Evidence from Studies
Supporting (1)
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Effects of Low- Versus High-Velocity-Loss Thresholds With Similar Training Volume on Maximal Strength and Hypertrophy in Highly Trained Individuals.
Contradicting (0)
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