Fig. 5. In vitro mechanical performance of a bluegill sunfish abductor superficialis fascicle at a range of temperatures. (A) Applied stimulus and strain and the resulting fascicle stress. Broken lines show fascicle strain, unbroken lines show stress. (B) Work loops showing fascicle stress plotted in relation to strain. In both plots the thickened portions of the stress traces show when the fascicle was being stimulated. The stimulus onsets and durations were those that produced maximal power output. Strains are shown relative to resting length, L_R. Stresses are shown relative to peak isometric tetanic stress, P₀. Data are representative traces from a single fascicle.