FIGURE 3.

Muscle stress and intramuscular pressure achieved during combined protocols shown in Figure 1C. Data have been rearranged so that corresponding pressures and stresses are in the same location to illustrate the history effect (see text). (A) Stress achieved during the shortening/lengthening protocol. (B) Intramuscular pressure achieved during the shortening/lengthening protocol. (C) Stress achieved during the lengthening/shortening protocol. (D) Intramuscular pressure achieved during the lengthening/shortening protocol. P₀, initial isometric force, P_C, force developed during concentric contraction, P₀₁, isometric force developed after the first length change, P_E, force developed during eccentric contraction, and P₀₂, isometric force developed at then end of this series of length change with the muscle returned to the starting length. Corresponding pressures are defined as I₀, I_C, I₀₁, I_E, and I₀₂. Each bar represents mean ± SEM for 10 animals.