Sports, Exercise & Health Science SL
Sports, Exercise & Health Science SL
18
Chapters
196
Notes
Chapter 1 - Musculoskeletal Anatomy
Chapter 1 - Musculoskeletal Anatomy
Chapter 2 - Cardio - Respiratory Exercise Physiology
Chapter 2 - Cardio - Respiratory Exercise Physiology
Chapter 3 - Nutrition & Energy Systems
Chapter 3 - Nutrition & Energy Systems
Chapter 4 - Movement Analysis
Chapter 4 - Movement Analysis
Chapter 5 - Skill In Sport
Chapter 5 - Skill In Sport
Chapter 6 - Measurement & Evaluation Of Human Performance
Chapter 6 - Measurement & Evaluation Of Human Performance
Chapter 7 - Training To Optimize Physiological Performance
Chapter 7 - Training To Optimize Physiological Performance
Chapter 8 - Environmental Factors & Performance
Chapter 8 - Environmental Factors & Performance
Chapter 9 - Non-Nutritional Ergogenic Aids
Chapter 9 - Non-Nutritional Ergogenic Aids
Chapter 10 - Individual Differences In Sport
Chapter 10 - Individual Differences In Sport
Chapter 11 - Motivation In Sport & Exercise
Chapter 11 - Motivation In Sport & Exercise
Chapter 12 - Arousal, Anxiety & Performance
Chapter 12 - Arousal, Anxiety & Performance
Chapter 13 - Psychological Skills Training
Chapter 13 - Psychological Skills Training
Chapter 14 - Overtraining, Stress & Burnout In Adolescent Athletes
Chapter 14 - Overtraining, Stress & Burnout In Adolescent Athletes
Chapter 15 - Physical Activity & Health
Chapter 15 - Physical Activity & Health
Chapter 16 - Nutrition For Sport & Exercise
Chapter 16 - Nutrition For Sport & Exercise
Chapter 17 - Internal Assessment & Practical Work
Chapter 17 - Internal Assessment & Practical Work
Chapter 18 - Perparing for your exams
Chapter 18 - Perparing for your exams
IB Resources
Chapter 4 - Movement Analysis
Sports, Exercise & Health Science SL
Sports, Exercise & Health Science SL

Chapter 4 - Movement Analysis

Unleash The Power Of Your Muscles: Roles In Joint Movement Explained

Word Count Emoji
681 words
Reading Time Emoji
4 mins read
Updated at Emoji
Last edited onย 14th Jun 2024

Table of content

Muscle roles when joints move ๐ŸŒŸ

Imagine trying to open a jar of delicious cookies - your muscles are working hard to twist and turn that lid, and they play different roles to get you to that cookie inside! Let's dive into their roles!

  • Agonist (Mover)

    • ๐Ÿš€ What does it do? Contracts (gets shorter) to move the bone. Think of it as the main character of our story.
    • ๐Ÿช Cookie Jar Example: When you're trying to open that cookie jar, your bicep (big muscle in front of your upper arm) is the prime mover! Helping it are the assistant movers: brachialis (below the bicep) and brachoradialis (muscle running from elbow to wrist in front).
  • Antagonist

    • ๐Ÿš€ What does it do? Acts opposite to the Agonist. Even though it's contracting, it's getting longer (weird, right?).
    • ๐Ÿช Cookie Jar Example: If you're slowly lowering a weight (like lowering that heavy jar of cookies), your biceps and its assistants are trying to keep things controlled. If they didn't, that jar would crash down!
  • Fixator (Stabilizer)

    • ๐Ÿš€ What does it do? Holds one part of the body still while the agonist does its thing. It's like your friend holding the base of the jar while you twist the lid.
    • ๐ŸŒณ Real World Example: The core muscles (around your belly) are like tree trunks, providing stability so our limbs can move freely. That's why strong abs are not just for looking cool at the beach; they keep our body stable!
  • Synergist (Neutralizer)

    • ๐Ÿš€ What does it do? Prevents unwanted additional movements of muscles. Think of it as the sidekick making sure the main character (agonist) doesn’t go off-script!
    • ๐Ÿช Cookie Jar Example: When flexing your bicep, it wants to do extra actions like turning the arm. If you don't want that, other muscles step in to make sure only the desired movement happens.

Muscle contraction types โ€“ decoded ๐Ÿ’ก

Muscles can contract in different ways, kind of like how an elastic band can be stretched, kept steady, or snapped back.

  • Concentric: Muscle shortens (like snapping an elastic band).
  • Eccentric: Muscle lengthens while contracting (like slowly letting an elastic band stretch).
  • Isometric: Muscle contracts but doesn’t move (like holding an elastic band steady).

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IB Resources
Chapter 4 - Movement Analysis
Sports, Exercise & Health Science SL
Sports, Exercise & Health Science SL

Chapter 4 - Movement Analysis

Unleash The Power Of Your Muscles: Roles In Joint Movement Explained

Word Count Emoji
681 words
Reading Time Emoji
4 mins read
Updated at Emoji
Last edited onย 14th Jun 2024

Table of content

Muscle roles when joints move ๐ŸŒŸ

Imagine trying to open a jar of delicious cookies - your muscles are working hard to twist and turn that lid, and they play different roles to get you to that cookie inside! Let's dive into their roles!

  • Agonist (Mover)

    • ๐Ÿš€ What does it do? Contracts (gets shorter) to move the bone. Think of it as the main character of our story.
    • ๐Ÿช Cookie Jar Example: When you're trying to open that cookie jar, your bicep (big muscle in front of your upper arm) is the prime mover! Helping it are the assistant movers: brachialis (below the bicep) and brachoradialis (muscle running from elbow to wrist in front).
  • Antagonist

    • ๐Ÿš€ What does it do? Acts opposite to the Agonist. Even though it's contracting, it's getting longer (weird, right?).
    • ๐Ÿช Cookie Jar Example: If you're slowly lowering a weight (like lowering that heavy jar of cookies), your biceps and its assistants are trying to keep things controlled. If they didn't, that jar would crash down!
  • Fixator (Stabilizer)

    • ๐Ÿš€ What does it do? Holds one part of the body still while the agonist does its thing. It's like your friend holding the base of the jar while you twist the lid.
    • ๐ŸŒณ Real World Example: The core muscles (around your belly) are like tree trunks, providing stability so our limbs can move freely. That's why strong abs are not just for looking cool at the beach; they keep our body stable!
  • Synergist (Neutralizer)

    • ๐Ÿš€ What does it do? Prevents unwanted additional movements of muscles. Think of it as the sidekick making sure the main character (agonist) doesn’t go off-script!
    • ๐Ÿช Cookie Jar Example: When flexing your bicep, it wants to do extra actions like turning the arm. If you don't want that, other muscles step in to make sure only the desired movement happens.

Muscle contraction types โ€“ decoded ๐Ÿ’ก

Muscles can contract in different ways, kind of like how an elastic band can be stretched, kept steady, or snapped back.

  • Concentric: Muscle shortens (like snapping an elastic band).
  • Eccentric: Muscle lengthens while contracting (like slowly letting an elastic band stretch).
  • Isometric: Muscle contracts but doesn’t move (like holding an elastic band steady).

Unlock the Full Content! File Is Locked Emoji

Dive deeper and gain exclusive access to premium files of Sports, Exercise & Health Science SL. Subscribe now and get closer to that 45 ๐ŸŒŸ