Lesson 1, Topic 1
In Progress

05-Metabolic Rates

March 28, 2021

The basal metabolic rate (BMR) is the rate at which nutrients are catabolized under basal conditions (that is, when the individual is resting but awake, is not digesting food, and is not adjusting to a cold external temperature). Or, stated differently, the BMR is the energy (measured in calories) that must be produced per hour by catabolic reactions just to keep the body alive, awake, and comfortably warm.

To provide energy for muscular work, as well as digestion and absorption of nutrients, an additional amount of energy must be produced by catabolism of nutrients. The amount of additional energy from nutrients needed depends mainly on how much work the individual does. The more active he or she is, the more nutrients the body must catabolize and the higher the total metabolic rate will be. The total metabolic rate (TMR) is the total amount of energy used by the body per day (Figure 19-7).