Figure 5).

The incidence of ventricular fibrillation (VF) during coronary artery occlusion (filled histograms) and following reperfusion (open histograms) in control dogs (C), in dogs exercised 24 h and 48 h previously as well as in dogs in which the exercise protocol was repeated (two times 48 h). The effect of aminoguanidine (AG) in exercised dogs (24 h plus AG) and in nonexercised dogs (C plus AG) is also illustrated. Also shown in the right hand panels (shaded histograms) is survival from the combined ischemia-reperfusion insult. *P<0.05 versus controls