How is RER calculated?

The respiratory exchange ratio (RER) is calculated by dividing the volume of carbon dioxide produced (VCO2) by the volume of oxygen consumed (VO2). This ratio provides insights into the substrate utilization in the body during metabolism. When the body metabolizes carbohydrates, the RER approaches 1.0, whereas when it metabolizes fats, the RER is closer to 0.7.

The accurate calculation of RER is crucial for exercise physiology, as it allows professionals to assess energy expenditure and metabolic processes in response to different forms of physical activity. Understanding RER can guide training programs, nutrition advice, and recovery strategies based on an individual's metabolic profile.