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One study indicates top athletes are closing in on the limitations of human physical performance. “If we don’t accept doping, when it comes to physical ability to perform, we are very close to the limit,” said Michael Rennie, a professor of clinical physiology at the University of Nottingham in England. He cited throwing events such as shot put, discus and hammer, suggesting that athletes in those events might already have reached the body’s full potential. “There’s been almost no change in those world records since around 1989,” he said. “[These events] require a lot of muscle mass, and it is possible that today’s athletes have reached the optimal power-to-weight ratio.”
