Component One - The Human Body and Movement in Physical Activity and Sport
Component Two - Socio-Cultural Influences and Well Being

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

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

Question 1 of 3

2.

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

Question 2 of 3

3.

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

Question 3 of 3