Your muscles make more protein when you start lifting weights, but after a few weeks, that boost fades — even if you keep lifting harder — no matter if you use heavy or light weights.

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Evidence from Studies

Supporting (1)

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Resistance training load does not determine resistance training-induced hypertrophy across upper and lower limbs in healthy young males.

Randomized Controlled Trial

Human

2025 Dec 31

Even though people kept lifting heavier or doing more reps for 10 weeks, their muscles stopped building protein as fast after the first week — meaning the body gets used to the workout and responds less over time, no matter how hard you train.

Contradicting (0)

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No contradicting evidence found

Source Study

Resistance training load does not determine resistance training-induced hypertrophy across upper and lower limbs in healthy young males.

Score: 46

DOI: 10.1113/JP289684

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