Common IB Mistakes in Movement Generation
Movement generation is a core area of biomechanics in IB Sports, Exercise and Health Science (SEHS), yet it is one of the topics where students frequently lose marks. These errors usually stem from vague explanations, incorrect terminology, or failure to apply concepts to real movement scenarios.
Understanding common mistakes helps students refine their answers and produce clearer, higher-scoring responses in IB exams.
Confusing Muscle Contraction Types
One of the most frequent mistakes is mixing up concentric, eccentric, and isometric muscle contractions.
Common errors include:
- Saying a muscle shortens during eccentric contraction
- Failing to identify whether movement is occurring
- Describing contractions without referencing muscle length
High-mark answers clearly state what happens to muscle length and joint movement for each contraction type.
Incorrect Identification of Agonist and Antagonist Muscles
Another common issue is incorrectly naming or describing muscle roles during movement.
Typical mistakes include:
- Naming the wrong agonist for a movement
- Forgetting the role of the antagonist
- Stating that antagonists are inactive
In IB SEHS, students should explain how antagonists often perform eccentric contractions to control and stabilise movement.
Overlooking Neural Control
Many students focus only on muscles and ignore the role of the nervous system in movement generation.
Common omissions include:
- Not mentioning motor units
- Ignoring motor unit recruitment
- Failing to link force production to neural activation
