In his article „Better Chemistry Through Breathing: The Story of Carbon Dioxide and How It Can Go Wrong“, breathing expert Christopher Gilbert, PhD, explains the often misunderstood dynamics between O2 and CO2 in breathing and the causes and effects of hyper- and hypoventilation in physical and cognitive performance and emotional states. He includes hyper- and hypoventilation self-tests and comprehensively sums up the key points about CO2 in relation to breathing.
Source: http://www.resourcenter.net