AQA GCSE · Question 14.3 · The Human Body and Movement in Physical Activity and Sport
Define 'isometric contraction'.
Use a sporting example in your answer.
How to approach this question
1. Provide the definition of an isometric contraction, focusing on the lack of change in muscle length and absence of movement. 2. Think of a sporting action where a position is held statically against a resistance (like gravity) and describe it.
Full Answer
Definition: An isometric contraction is when a muscle contracts but there is no change in its length, so no movement occurs.
Example: Holding a plank position, or a crucifix position on the rings in gymnastics.
**Definition:** An isometric contraction occurs when a muscle generates tension but does not shorten or lengthen, and as a result, there is no movement at the joint. The muscle is working to hold a static position against an opposing force.
**Sporting Example:** A clear example is holding a plank. The abdominal and core muscles are contracting isometrically to keep the body in a straight line against the force of gravity. Other examples include a rugby scrum where players are pushing against each other with no movement, or a gymnast holding a handstand.
Common mistakes
Confusing isometric with isotonic (where movement occurs). Providing an example that involves movement.
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