Physiological research. Researcher monitoring his subject (on exercise bike) in a pressure chamber during research into the effects that extreme conditions have on human physiology. The chamber has been used to recreate the conditions of low pressure and low oxygen content at an altitude of 8000 metres (similar to the height of the tallest mountains on Earth). Low temperature and high wind speed conditions are also possible. Monitoring equipment records data such as breathing rate, heart rate, blood oxygen content, respiratory gas exchange, body temperature, and heart function. Photographed at a facility of the French national military health research centre (CRSSA), France.