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1. Slow twitch fibres (Type I): Slow twitch fibres contract slowly but can contract repeatedly over long periods. They have a good blood supply, hence they are âred fibresâ, and are suited to endurance activity using the aerobic energy system which relies on oxygen from the blood for the supply of energy.
After studying part II of this chapter you should be able to: 1. Discuss how contractile force is regulated. 2. Describe the difference between a twitch, wave summation, tetany, and treppe in muscle. contraction. 3. Describe the difference between isometric and isotonic contractions. 4. Discuss the length tension relationship of skeletal muscle. 5. Describe the energy requirements of skeletal muscle and the creatine phosphate system.