Isotonic is the word you're looking for.
Isotonic means the tension remains the same, but the length can change.
Isometric means the length remains the same, but the tension can change.
Isotonic
isometric contractions
The muscle length will not change during a contraction.
Isotonic contraction
Isotonic ContractionIsotonic Contraction
Contraction in which opposing muscles contract against each other and prevent movement. Fixation action of a muscle in a static contraction is termed isometric, because it develops tension without changing length.
What is isometric exexrcises
An isometric contraction builds tension but there is no joint movement.
It is called concentric isotonic contraction.
Walking is an example of isotonic type of contraction. These are contractions which will force the length of the muscle to change and cause movement.
Muscle length is what doesn't change, so the variable would be the amount of force exerted on the muscle.
An isometric contraction is the name given to a skeletal muscle that does not shorten, but increases tension. The muscles generate force to protect themselves.
shortens while maintaining constant tension.