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cofactor · 4
A load slightly beyond what you can currently handle triggers a cascade of signals, chief among them mechanical tension, telling muscle cells to grow bigger and stronger. Progressive overload is the way to keep that signal coming; what happens once the signal is inside the cell is the subject of how muscle growth works.
More training brings more fatigue. In a meta-analysis, across the studies it pooled, the more sets per muscle per week, the more muscle grew, and it did not locate a plateau. Muscle grows during recovery, so recovery capacity sets the ceiling on useful volume.
When you train strength and endurance together, how much they interfere depends largely on total volume. Keep the weekly load of both within what you can recover from and the interference is usually small; it becomes noticeable when volume gets out of hand.
A beginner's rapid strength gains come largely not from more muscle but from the nervous system learning to use existing muscle better: in a classic study, most of the strength gained in the first weeks of training came from neural adaptation. Crediting all of it to muscle makes the inevitable slowdown look like going backward.
regulates · 3
Tendons, ligaments and bone adapt more slowly than muscle and nerves. Add load too fast and the muscle copes while the slower tissues fall behind, and overuse injuries often arise in that gap.
←Does stretching prevent injury
Injuries often happen when load goes up before the soft tissues have adapted, so the "progressive" in progressive overload is itself part of injury prevention. In a meta-analysis of randomized trials, stretching showed no protective effect, while strength training cut sports injuries by about two thirds.
The nervous system recovers fast, which can make you overestimate your real progress while tendons, ligaments and the muscle itself lag behind. When returning, start well below your pre-break weights and build up progressively, giving the slower tissues time to catch up.
contrast · 1
Soreness is not a report card: someone who has trained regularly for years can have an effective session and barely feel sore, while a beginner can be too sore to walk downstairs after an easy one. Whether training works shows in strength and performance rising under progressive overload.