An isometric contraction builds tension but there is no joint
movement.
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An isometric contraction is when the muscle does not shorten and
no movement results.
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Isometric contraction
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An Isotonic muscle contraction is a muscle contraction that
makes your limbs move whereas an Isometric contraction is a muscle
contraction where the limbs stay static
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If the muscle can not shorten because the muscle is trying to
move a load that is greater than the force, then the contraction is
isometric.