Anatomy & Physiology › Section I · Muscle tissue › Topic I.4
Fibre types and exercise performance
A marathon runner's calf and a sprinter's thigh are built from the same proteins, yet they behave very differently. This topic sorts skeletal muscle fibres into types by speed and fuel, then looks at how use, disuse and age reshape them. It describes physiology for study, not training or medical advice.
In this topic
- Two ways to classify a fibre
- Slow oxidative fibres
- Fast oxidative and fast glycolytic fibres
- Worked example: reading a fibre profile
- How endurance exercise changes muscle
- How resistance exercise changes muscle
- Worked example: a thicker fibre
- Atrophy, sarcopenia and soreness
- Performance-enhancing substances
- Common mistakes to avoid
- Key takeaways
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