Lengthtension relationship Figure 111

- measures tension developed during isometric contractions when the muscle is set to fixed lengths (preload).

a. Passive tension is the tension developed by stretching the muscle to different lengths.

b. Total tension is the tension developed when the muscle is stimulated to contract at different lengths.

c. Active tension is the difference between total tension and passive tension.

Muscle length

Figure 1-11. Length-tension relationship in skeletal muscle.

Muscle length

Figure 1-11. Length-tension relationship in skeletal muscle.

- Active tension represents the active force developed from contraction of the muscle. It can be explained by the cross-bridge cycle model.

-Active tension developed is proportional to the number of cross-bridges formed. Tension will be maximum when there is maximum overlap of thick and thin filaments. When the muscle is stretched to greater lengths, the number of cross-bridges is reduced because there is less overlap. When muscle length is decreased, the thin filaments collide and tension is reduced.

2. Force-velocity relationship (Figure 1-12)

- measures the velocity of shortening of isotonic contractions when the muscle is challenged with different afterloads (the load against which the muscle must contract).

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