When lifting weights to complete fatigue, using loads lighter than 20% of your maximum strength results in smaller muscle growth compared to using loads between 20% and 80% of your maximum strength.

From: How Many Reps for Muscle Growth? (40+ Studies)

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What this claim means

When lifting weights to complete fatigue, using loads lighter than 20% of your maximum strength results in smaller muscle growth compared to using loads between 20% and 80% of your maximum strength.

See the technical phrasing

Resistance training with loads below 20% of one-repetition maximum produces less muscle hypertrophy than resistance training with loads between 20% and 80% of one-repetition maximum when both are performed to volitional failure.

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