Isometric Contraction

Definition

Muscle contraction without length change or joint movement, like holding a plank. It looks like nothing's happening, but your muscles disagree.

Example Usage

I held an isometric wall sit for 60 seconds and my quads filed a formal complaint.

Origin

From Greek 'iso' (equal) and 'metric' (measurement); biomechanics terminology.

Fun Fact

Isometric holds can increase strength at specific angles but don't build strength across the full range of motion.

Source: Biomechanics and strength training science

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Antagonist Pairing

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