Antoine-Laurent de Lavoisier (1743-1794) and the birth of respiratory physiology.

BACKGROUND For more than 1500 years, the status of knowledge concerning the physiology of human respiration has remained almost unchanged. In the 18th century, the French chemist Antoine-Laurent de Lavoisier conducted breathing experiments on human and animal respiration. METHODS The main bibliographic sources concerning Lavoisier's life and work on respiration have been investigated and analysed. RESULTS Using an ice-calorimeter, Lavoisier proved that combustion and respiration were one and the same. He also measured the oxygen consumed during respiration and concluded that the amount changes depending on human activities: exercise, eating, fasting, and sitting in a warm or cold room. Moreover, he found variations in pulse and breathing rate. CONCLUSIONS Lavoisier's work on respiration is of great historical significance as it represents the first effort to measure human respiratory gas metabolism contributing significantly to the development of respiratory physiology.