OHSU

Energy Expenditure & Body Composition:

Indirect Calorimetry

Indirect CalorimetryThe indirect calorimetry equipment measures volume of oxygen consumption and volume of carbon dioxide output by placing a plexi-glass canopy over the head in a supine position.  Resting Energy Expenditure (REE) includes a 20 minute rest period followed by 30 minutes of data collection.  Energy expenditure (EE) and Respiratory Quotient (RQ), a measure of relative fat vs. carbohydrate oxidation, are determined.  Basal Metabolic Rate (BMR) can be determined with a protocol similar to the REE, involving an overnight stay the night before.  Thermic effect of food (TEF) can also be determined by feeding the participant a known quantity of food and monitoring EE and RQ for an additional 6 hours.  Length of measurements may vary per protocol guidelines.                                                                               

Activity Monitoring

ActicalActivity monitoring can be conducted using an Actical™, Actiwatch™, Actiwatch SCORE™, or pedometer.  The Actical™, Actiwatch™, and Actiwatch SCORE™ calculate minute-by-minute energy expenditure by an omnidirectional accelerometer to monitor the occurrence and intensity of motion.  This data is used to calculate hourly, daily, and custom interval caloric expenditure.  The pedometers are used to measure step count.  Activity monitoring can be collected during wake or sleep cycles.                    

Consultation on Body Composition & Energy Expenditure

Body composition is measured by BODPOD™, DEXA, BIA, height, recumbent length, weight, body circumferences, waist-to-hip ratio, and skinfold thickness.  Energy expenditure measurements include, but are not limited to, resting energy expenditure, basal metabolic rate, thermic effect of food, and activity monitoring.

"The OCTRI Bionutrition Unit does not currently offer this service. Please contact us if you are interested in this service for your research study."

Training on Equipment & Procedures

Bionutrition staff members can train study staff to perform measurements using Biolectrical Impedance Analysis machines, a portable stadiometer, skin-fold calipers, tape measures (circumference measurements), BOD POD and indirect calorimetry machines.