When young women lift weights until they can't anymore, their arm and leg muscles get thicker by about 6-9% after 6 weeks. It doesn't matter if they lift heavy or light weights—both work the same for muscle growth.

40

Pro

0

Against

Evidence from Studies

Supporting (1)

40

Community contributions welcome

40

Comparing the effects of low and high load resistance exercise to failure on adaptive responses to resistance exercise in young women

Randomized Controlled Trial

Human

2019 Jun

The study shows that when young women lift weights until they can't anymore, their muscles grow about the same amount whether they use heavy or light weights, which matches the claim.

Contradicting (0)

0

Community contributions welcome

No contradicting evidence found

Gold Standard Evidence Needed

According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.

Source Study

Comparing the effects of low and high load resistance exercise to failure on adaptive responses to resistance exercise in young women

Score: 40

DOI: 10.1080/02640414.2018.1559536

Similar Assertions

When young women do strength exercises until they can't do any more, their arm and leg muscles get stronger by about 15-27% after 6 weeks. It doesn't matter if they lift heavy or light weights—both ways work just as well for building strength.

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When young women lift weights until they can't anymore, using lighter weights gives about the same muscle growth as heavier weights over 6 weeks, with arms and legs both getting a bit bigger.

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When young women lift weights until they can't anymore, using lighter weights or heavier weights leads to about the same muscle growth in their arms and legs after 6 weeks.

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When young women lift weights until they can't anymore, using lighter weights or heavier weights doesn't make a big difference in how much stronger they get. Their arm and leg strength both go up about the same amount after six weeks.

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When young women lift weights until they can't anymore, using lighter weights (30% of max) gives about the same strength gains as heavier weights (80% of max) over 6 weeks, with arms and legs getting stronger by similar amounts.

40

0

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