The purpose of this study is to compare RMR values from the BIA, predicted equations, and indirect calorimetry.

Resting metabolic rate (RMR) describes the number of calories a person utilizes while at rest. The gold standard measurement is via inspired and expired air using a metabolic cart. However, researchers have established estimation equations and the use of body composition analysis to predict RMR when a metabolic cart is unavailable. The accuracy of the predicted equations and whole-body bioelectrical impedance (BIA) machines that produce this data is unknown. Therefore, the purpose of this study is to compare RMR values from the BIA, predicted equations, and indirect calorimetry.

Aim 1: to compare measured RMR from indirect calorimetry to values provided by the InBody 770 BIA machine and to established gender and age-appropriate prediction equations.

Aim 2: to compare RMR measured from indirect calorimetry using a metabolic cart (Gold Standard) to the Medgem handheld indirect calorimeter (FDA approved device).

Inclusion Criteria:

• Men & women, aged 18-60

Exclusion Criteria:

• Have any known or suspected metabolic diseases such as diabetes, thyroid disorder, or high cholesterol
• Have any known or suspected cardiovascular or pulmonary diseases such as hypertension
• Are currently on beta blockers, taking antihypertensives, or antidepressants
• Current smoker or quit less than a year ago
• Unwilling to provide finger stick and urine sample

Men & women, aged 18-60 in cohorts by age: 18-24, 24-29, 30-39, 40-49, and 50-60 years of age