The fact that natural bodybuilding is a very healthy activity is reflected in the findings of some beneficial cardiovascular effects in this showed reduced blood pressure, reduced arterial stiffness, and increased maximal oxygen intake. He also showed a reduced cardiac output (reflected in a lower resting pulse, indicative of more efficient heart pumping action). He showed improved cardiac perfusion, or the level of blood circulation in his heart. This is the opposite of what happens in bodybuilders who use large doses of anabolic steroids–they show reduced blood circulation within the heart. There was no indications of either higher blood lipid, or cholesterol levels or any sign of excess inflammation, also linked to cardiovascular disease. The bodybuilder showed parasympathetic dominance , which reflects a greater activity of the part of the autonomic nervous system that slows the heart rate. This is linked to greater electrical stability of the heart. In turn, this means lower chance of potentially fatal heart rhythm disturbances. The improved autonomic function was also reflected in a greater variation of his pulse pressure, which is related to blood pressure. In bodybuilders who abuse anabolic steroids, there is a sympathetic dominance . the reverse of what is seen in drug-free bodybuilders. This sympathetic dominance sets up drug-using bodybuilders for possibly serious heart rhythm disturbances.