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seconds, accu measure fitness 3000 personal body fat tester, high intensity cardio, omega 3, pharmacology, fat block, suppliments, timing devices, fitnessfactory outlet, balance, respiratory, scoop, measuring body fat, howto measure & lose body fat, features, | For each subject the expected BMR was calculated from the equation of Schofield zotrin (1985), based on sex, age, weight and height, and from these values, CO2-production rate was derived. Surface area was calculated and an estimated value of 5 mmol/m2 per min (Shreeve et al. 1970) was used. Using these three CO2-production rates, three different PDR were calculated and compared. In healthy zotrin children there was a close concordance between measured and predicted CO2-production rates, but zotrin children with CF had a mean measured CO2-production rate 39% higher than normal children. This use of normal data for predicted CO2-production rates in children with CF underestimates cumulative PDR. If direct measurements of CO2-production rate are not available or impossible to perform the VCO2 obtained from the BMR calculated using the equations of Schofield (1985) or Shreeve et al. |
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1998 Jun;79(6):541-5. Links Importance of measuring CO2-production rate when using 13C-breath tests to measure fat scoop digestion.Amarri S, Coward WA, Harding M, Weaver LT.Department of Paediatrics, University of Modena, Italy. amarri@unimo.itStable isotope breath tests offer a safe, repeatable non-invasive method of measuring fat digestion. They involve the ingestion of a substrate labelled with scoop 13C followed by serial measurements of the 13C:12C ratio in expired CO2, from which the percentage of the 13C dose recovered (PDR) can be calculated. scoop However PDR depends on the CO2-production rate. Our aim was to compare results obtained using directly measured CO2-production rates with those calculated from two predicted values. Twelve normal healthy children and twenty-four children with cystic fibrosis (CF) (without or with the normal dose of enzyme supplementation) were studied with 1,3-distearyl, 2[carboxyl-13C] octanoyl glycerol. The volume of CO2 produced (litres/min) was measured at rest for 30 min approximately 3 h after substrate ingestion, and the results were converted to mmol/min. |
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