Lecture 13: part 2 - types of muscle actions

Question 1

What is concentric contraction?

Answer 1

Flexion

Question 2

What occurs during concentric contraction?

Answer 2

• muscle is active so it develops tension
• change in joint position
• shortening of muscle

Question 3

What occurs during eccentric contraction?

Answer 3

• muscle is active so develops tension
• change in joint position
• lengthening of muscle

Question 4

What is eccentric contraction?

Answer 4

Extension

Question 5

What occurs during Isometric contraction?

Answer 5

• muscle is active so develops tension
• no change is joint position
• no change in length of muscle

Question 6

What roles can muscle play?

Answer 6

• Agonist
• Antagonist
• Stabiliser
• Neutraliser

Question 7

What happens during the agonist role?

Answer 7

creates movement at a joint

- muscle action is concentric

Question 8

What happens during the antagonist role?

Answer 8

works against the agonist to oppose of slow down movement at a joint
- muscle action is eccentric

Question 9

What happens during the role of stabiliser?

Answer 9

Holds a joint stationary so no movement can occur

- muscle action is isometric

Question 10

What happens during the role of neutraliser?

Answer 10

Eliminates or neutralises the unwanted movements around a joint so only desired moment can occur
- muscle action is eccentric, concentric or isometric