Fig. 7. Time course of lactate concentration changes in (A) white and (B) dark levator muscles and (C) hemolymph following fatiguing exercise. Resting values are plotted first. The 0 min time point is immediately following exercise. Note the increase in lactate following exercise in white fibers from large crabs and the prolonged period of time for lactate removal from all tissues in large crabs. The differences among the size classes are less dramatic in the dark levator muscle than in the white levator muscle.