We compared 10 published equations for calculating energy expenditure from oxygen consumption and carbon dioxide production using data for 10 high-caliber male distance runners over a wide range of running velocities. We found up to a 5.2% difference in calculated metabolic rate between 2 widely used equations. We urge our fellow researchers abandon out-of-date equations with published acknowledgments of errors or inappropriate biochemical/physical assumptions.
Keywords: analyse des gaz expirés; calorimétrie indirecte; expired gas analysis; indirect calorimetry; metabolic rate; ratio d’échanges gazeux; respiratory exchange ratio; running economy; taux métabolique; économie de la course.