Does Viagra Improve Athletic Performance? Among the many "responders," instances improved by 39 percent in comparison with a sildenafil-free performance. Jacobs said the research to this point has led him to imagine that less than 10 p.c of the general inhabitants would classify as a responder, somebody who might considerably benefit from sildenafil at altitudes much like the one within the Stanford study. You may must name or electronic mail numerous occasions for someone to take care of it once and for all. Most males can take Viagra with out experiencing any unwanted effects. Erectile dysfunction (ED) impacts 25 percent of men either fully or reasonably by age 40, McKinlay says. A Stanford University study revealed in 2006 within the Journal of Applied Physiology discovered that in oxygen-deprived circumstances simulating an altitude of 12,710 feet (3,874 m), sildenafil lowered instances by a collective 15 percent amongst 10 trained male cyclists who carried out 3.7-mile (6 kilometers) time trials. The findings are published in the Journal of Clinical Endocrinology and Metabolism. Caffeine and amphetamines (i.e. pace) are two of the most well-liked methods, but they're removed from perfect.