Thank you for the opportunity to help you with your question!
Every movement your body makes involves muscle
contraction and the list of exercises available is endless. If your goal
is to improve performance, understanding the types of muscular
contractions, and which exercises utilize those contractions, will
improve your muscular strength and performance.
Isotonic contraction is the force generated by a
muscle while contracting, when the muscle lengthens and shortens during
movement, with the force remaining constant. Therefore, when picking up a
glass to take a drink your muscles would use the same force throughout
the movement up and down, which is nearly impossible. During normal
muscle contraction the force varies throughout the movement. A more
accurate term is dynamic contraction, meaning the muscle tension varies
as it moves the glass. Common exercises demonstrating this type of
contraction are dumbbell curls, squats, lunges and walking. These forms
of exercises help to isolate certain muscle groups, as in the case of
dumbbell curls during which the primary muscle worked is the bicep.
Please let me know if you need any clarification. I'm always happy to answer your questions.
Jun 25th, 2015
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