Resting respiration or resting metabolic rate (RMR) is measured under standard conditions of an 8–12-h fast and a 12-h abstinence from exercise. In an exemplary study (Haugen 2003 Am J Clin Nutr), "subjects rested quietly in the supine position in an isolated room with the temperature controlled to 21–24° C. RMR was measured for 15–20 min. Criteria for a valid RMR was a minimum of 15 min of steady state, determined as a <10% fluctuation in oxygen consumption and <5% fluctuation in respiratory quotient". The main difference between RMR and BMR (basal metabolic rate) is the position of the subject during measurement. Resting metabolic rate is the largest component of the daily energy budget in most human societies and increases with physical training state (Speakman 2003 Proc Nutr Soc).
MitoPedia topics: EAGLE
Contributed by Gnaiger E 2012-06-30.
Resting and sleeping metabolic rate, RMR and SMR
- Average SMR tends to be lower than RMR in obese subjects and higher than RMR in non-obese subjects Zhang 2002 Int J Obes Relat Metab Disord.