Fig. 7. Red fibre preparations: superimposed time courses of power (thick line) and cumulative work (thin line) during one cycle of movement at 1Hz. Stimulation with a duty factor of 0.4 was given at four different stimulation phases, as shown in the diagrams on the left. Fibres were taken from four different positions along the body, as shown in the diagram at the bottom. BL, body length. The power scale is shown on the left axis and the work scale on the right axis. All recordings are from fibre preparations from the same eel.