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Isotonic

Idealized constant tension while length changes—not exactly a real dumbbell curl.

Isotonic. Idealized constant tension while length changes—not exactly a real dumbbell curl.
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Illustration notes & sources

Original educational illustrations. The first three are muscle actions; the remaining panels describe loading or movement patterns. Ghost positions show successive states. Static illustrations do not demonstrate speed.

OpenStax · Muscle tensionNSCA · Stretch-shortening cycle