Field metabolic rate (FMR) refers to a measurement of the

metabolic rate Metabolism (, from el, μεταβολή ''metabolē'', "change") is the set of life-sustaining chemical reactions in organisms. The three main functions of metabolism are: the conversion of the energy in food to energy available to run ce ...

of a free-living animal.

Method

Measurement of the Field metabolic rate is made using the doubly labeled water method, although alternative techniques, such as monitoring

heart rate Heart rate (or pulse rate) is the frequency of the heartbeat measured by the number of contractions (beats) of the heart per minute (bpm). The heart rate can vary according to the body's physical needs, including the need to absorb oxygen and excr ...

s, can also be used. The advantages and disadvantages of the alternative approaches have been reviewed by Butler, ''et al.'' Several summary reviews have been published.

References

Metabolism Biological concepts Temporal rates {{biology-stub