Red muscle fibres |
White muscle fibres |
Thinner, darker colour, slow contraction rate. |
Thicker, lighter in colour, fast contraction rate. |
Have numerous mitochondria and myoglobin |
Have less number of mitochondria and myolobin |
Less accumulation of lactic acid |
More accumulation of lactic acid. |
They do not get tired soon and can contract for prolonged durations without fatigue. |
They are adapted for fast and strenuous work for short intervals and soon get fatigued. |