Which of the following type of muscle fibres will be the first one to undergo fatigue ?

Options

A. Acrobic fibres
B. Slow oxidative fibres
C. Fast oxidative - glycolytic fibres
D. Fast glycolytic fibres

Answer

To determine which type of muscle fibers will be the first to undergo fatigue, we need to analyze the characteristics of each type of muscle fiber mentioned in the question.

### Step-by-Step Solution:

1. **Identify the Types of Muscle Fibers**:
- Aerobic Fibers
- Slow Oxidative Fibers
- Fast Oxidative Glycolytic Fibers
- Fast Glycolytic Fibers

2. **Analyze Aerobic Fibers**:
- These fibers rely on oxygen for energy production.
- They have low power contractions and fatigue slowly.
- **Conclusion**: Aerobic fibers do not fatigue quickly.

3. **Analyze Slow Oxidative Fibers**:
- Similar to aerobic fibers, these fibers also use oxygen for energy.
- They exhibit slow contractions and low fatigue levels.
- **Conclusion**: Slow oxidative fibers also do not fatigue quickly.

4. **Analyze Fast Oxidative Glycolytic Fibers**:
- These fibers can contract quickly and also utilize oxygen.
- They are designed for fast movement but have a good oxygen supply.
- **Conclusion**: Fast oxidative glycolytic fibers can sustain activity without quick fatigue.

5. **Analyze Fast Glycolytic Fibers**:
- These are also known as white fibers.
- They have low mitochondria and rely on anaerobic respiration.
- Due to low ATP production and lack of oxygen, these fibers fatigue quickly.
- **Conclusion**: Fast glycolytic fibers are the first to undergo fatigue.

6. **Final Answer**:
- Based on the analysis, the type of muscle fibers that will be the first to undergo fatigue is **Fast Glycolytic Fibers**.