More overload
causes more muscle damage, which in turn means more growth, given that your diet meets the nutritional demands of your training.
This would then explain why eccentric training tends to produce greater gains in strength overall, because eccentric training typically involves greater absolute loads (as well
as more muscle damage).
Heavier working weights
do more muscle damage per repetition and trigger more intensive natural testosterone production.
However, we do know that eccentric contractions
create more muscle damage and also more effective for hypertrophying a muscle.
Since more tension equals to
more muscle damage, this will ultimately push your upper pecs to grow bigger and meaner.
However, it has a stronger effect on the muscle tissue leading to
more muscle damage.
This emphasizes the return or lowering action of any lift on the basis that this produces better hypertrophy because
more muscle damage and fiber recruitment is achieved.
Eccentric contractions create
more muscle damage than concentric contractions — and most studies show that eccentric contractions lead to greater strength gains and muscle hypertrophy than concentric contractions.