From the earlier mnemonics we can see that:
Iso - Constant
Tonic - Movement
Contraction - Tension
From this we can understand that:
Isotonic contraction = constant movement while the muscles are in tension, or:
Isotonic Contraction - Muscle contraction that results in limb movement
There are two types of isotonic contraction
A. Concentric contraction - Shortening of the muscle and the muscle in tension (a shortening of the muscles)
B. Eccentric contraction - Lengthening of the muscle and the muscle in tension (a lengthening of the muscles)
1. Isotonic contractions occur when you:
Move a dumbbell in a bicep curl upwards and downwards.
2. Completing a full squat downwards and back up is an example of an isotonic contraction.
3. A press up is an example of an isotonic contraction.