Types of Contraction

Isometric v Isotonic Contractions

An isometric contraction is where a muscle contracts but the length of the muscle does not change (therefore it doesn’t move). Sporting examples could include a rugby scrum or leaning back and holding in a tug of war.
           

An isotonic contraction is where a muscle contracts and movement is present. There are two types of isotonic muscular contraction:
Eccentric contractions occur when the muscle lengthen due to a greater opposing force.
Concentric contractions occur when the muscle shortens, therefore generating force.
 
 
Quick-Fire Questions

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1. Which of the following refers to the type of contraction present when a muscle shortens?

Isometric Contraction

Eccentric Contraction

Concentric Contraction

Question 1 of 3

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2.

These rugby players are demonstrating a scrum. What type of muscle contraction is used during a scrum?

Isometric

Isotonic

Eccentric

Concentric

Question 2 of 3

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3.

During the downward phase of a bicep curl, the bicep muscle is lengthening. Therefore, what type of muscle contraction is taking place?

Isometric

Concentric

Eccentric

Forwards

Question 3 of 3

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