When guys sit down and squeeze their quads as hard as they can, their hamstrings resist more than when they're lying flat — probably because the hips are bent.

20

Pro

0

Against

Evidence from Studies

Supporting (1)

20

Community contributions welcome

20

The role of agonist and antagonist muscles in explaining isometric knee extension torque variation with hip joint angle

Cross-Sectional Study

Human

2017 Oct

The study found that the hamstrings resist the movement more when the person is sitting compared to lying down, which matches what the claim says.

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

The role of agonist and antagonist muscles in explaining isometric knee extension torque variation with hip joint angle

Score: 20

DOI: 10.1007/s00421-017-3693-y

Similar Assertions

When guys get stronger from doing isometric leg exercises, their hamstring muscles don’t start working differently alongside their quads—so the way their hamstrings fire doesn’t predict whether they’ll get stronger or not.

39

0

82%

When healthy guys push with their legs, they're just as strong sitting or lying down—even though one position stretches the muscle more. That means muscle strength isn’t just about how stretched the muscle is.

20

0

70%