Metabolic rate in older critically ill patient

Research output: Chapter in Book/Report/Conference proceedingChapter


Age is a known factor in determining resting metabolic rate in healthy people. Resting metabolic rate falls as age increases. The decrease seems to be associated with an age-dependent decrease in fat-free mass rather than a decrease in metabolic rate per unit of mass. This decrease in resting metabolic rate is captured in many predictive equations, which have a variable for age.Asurprisingly limited amount of data exists on the resting metabolic rate of elderly critically ill patients. In one small study of trauma patients, the resting metabolic rate was reduced in older patients compared to younger, but the decrease was proportional to the expected decrease in resting metabolic rate in healthy aging. The incidence of fever was also lower in the older patients. In a much larger sample of trauma, surgical, and medical critical care patients prepared for this chapter, a lower body temperature and resting metabolic rate were again noted. The resting metabolic rate difference remained even after controlling for age, body size, and body temperature. Resting metabolic rate in the critically ill patient is predicted almost as well in the elderly as in the young.

Original languageEnglish (US)
Title of host publicationDiet and Nutrition in Critical Care
PublisherSpringer New York
Number of pages8
ISBN (Electronic)9781461478362
ISBN (Print)9781461478379
StatePublished - Jan 1 2015

All Science Journal Classification (ASJC) codes

  • General Medicine
  • General Biochemistry, Genetics and Molecular Biology


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