This study proposes to verify the total energy expenditure in patients with short bowel syndrome using the doubly labeled water method, as well as determining the rate of oxidation of nutrients, aiming to assist the management of nutritional therapy for these patients.
Study Type
OBSERVATIONAL
Enrollment
22
Clinical Hospital of Ribeirao Preto
Ribeirão Preto, São Paulo, Brazil
Assessment of total energy expenditure using the doubly labeled water method
After the determination of resting energy expenditure (REE), each volunteer will receive a dose of doubly labeled water (2H2 18O). A basal urine sample is collected before the intake dose and samples taken on days 1, 2, 3, 7, 12, 13, 14, thereafter. Urine samples will be analyzed by mass spectrometry (Hydra System, HIP 20-20, Europa Scientific, Cheshire, UK) in the Mass Spectrometry Laboratory of the Faculty of Medicine of Ribeirão Preto.
Time frame: 14 days
Resting energy expenditure (REE) and body composition measurements by indirect calorimetry and electrical bioimpedance, respectively.
This study also aims to measure the REE by indirect calorimetry with a Quark (Cosmed, Italy) calorimeter and the body composition by Byodinamics 450 (Biodynamics Corp., United States).
Time frame: After 12 hours of overnight fasting
Physical activity assessment
An activity monitor (activPAL ®, Glasgow, UK) is used to determine physical activity. By registering the intensity and duration of each category of activities, the system adds the energy estimated to generate a value that reflects the total energy expenditure.
Time frame: 14 days
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