Fig. 1. Changes in cardiac and ventilatory parameters (means ± S.E.M.) of eight Cancer magister during a 3 h control period in normoxia, food was then administered and changes followed for a further 12 h in normoxia. (A) Heart rate (beats min^-1), (B) stroke volume (ml beat^-1), (C) cardiac output (ml min^-1) and (D) ventilation rates (beats min^-1). In some cases standard errors were very small and do not show clearly on the figure.