PMID: 11323557Apr 27, 2001Paper

Energy cost of activity assessed by indirect calorimetry and a 13CO2 breath test

Medicine and Science in Sports and Exercise
M Leigh Richards, P S Davies

Abstract

The aim of this study was to assess the accuracy of a 13CO2 breath test for the prediction of short-duration energy expenditure. Eight healthy volunteers walked at 1.5 km.h-1 for 60 min followed by 60-min recovery. During this time, the energy cost of physical activity was measured via respiratory calorimetry and a 13C bicarbonate breath test. A further eight subjects were tested using the same two methods during a 60-min cycle at 0.5 kp, 30 rpm followed by a 60-min recovery. The rate of appearance of 13CO2 (RaCO2) was measured and the mean ratio, VCO2/RaCO2, was used to calculate energy expenditure using the isotopic approach. As would be expected, there was a significant difference in the energy cost of walking and cycling using both methods (P < 0.05). However, no significant differences were observed between respiratory calorimetry and the isotope method for measurement of energy expenditure while walking or cycling. These data suggest that the 13C breath test is a valid method that can be used to measure the energy cost of short duration physical activity in a field setting.

Citations

Jul 11, 2008·Medicine and Science in Sports and Exercise·Kate Ridley, Tim S Olds
Apr 25, 2007·Isotopes in Environmental and Health Studies·Anil S ModakGerald R Hobbs
Sep 1, 2007·Journal of Breath Research·Anil S Modak

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