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Rectus abdominis is the prime agonist and the superior and inferior oblique muscles are synergists. Erector spinae is an antagonist including a number of other muscles of the back.

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14y ago
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1mo ago

In trunk flexion, the agonist is the rectus abdominis muscle, which contracts to flex the trunk forward. The antagonist is the erector spinae muscles, which lengthen to allow the trunk to flex.

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Q: What is the Agonist and antagonist in trunk flexion?
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