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The Moxus Modular metabolic system evaluated with two sensors for ventilation against the Douglas bag method

Journal article
Authors Hans Rosdahl
Thomas Lindberg
Fredrik Edin
Johnny Nilsson
Published in European Journal of Applied Physiology
Volume 113
Pages 1353-1367
ISSN 14396319
Publication year 2013
Published at
Pages 1353-1367
Language en
Keywords Carbon dioxide production, Douglas bag method, Moxus Modular metabolic system, Oxygen uptake, Pneumotachometer, Reliability, Respiratory exchange ratio, Turbine flowmeter, Validity, Ventilation
Subject categories Sport and Fitness Sciences


This study evaluated the Moxus metabolic system with the Douglas bag method (DBM) as criterion. Reliability and validity were investigated in a wide range of ventilation and oxygen uptake and two sensors for determining ventilation were included. Thirteen well-trained athletes participated in one pre-test and four tests for data collection, exercising on a cycle ergometer at five submaximal powers (50-263 W) and at V•O max . Gas exchange variables were measured simultaneously using a serial setup with data collected on different days in an order randomized between Moxus with pneumotachometer (MP) and turbine flowmeter (MT) sensors for ventilation. Reliability with both sensors was comparable to the DBM. Average CV (%) of all exercise intensities were with MP: 3.0 ± 1.3 for VO 2 , 3.8 ± 1.5 for VCO 2 , 3.1 ± 1.2 for the respiratory exchange ratio (RER) and 4.2 ± 0.8 for V E . The corresponding values with MT were: 2.7 ± 0.3 for VO 2 , 4.7 ± 0.4 for VCO 2 , 3.3 ± 0.9 for RER and 4.8 ± 1.4 for V E . Validity was acceptable except for small differences related to the determination of ventilation. The relative differences in relation to DBM at the powers including V•O max were similar for both sensors with the ranges being: +4 to -2 % for V E , +5 to -3 % for VO 2 and +5 to -4 % for VCO 2 while RER did not differ at any power. The Moxus metabolic system shows high and adequate reliability and reasonable validity over a wide measurement range. At a few exercise levels, V E differed slightly from DBM, resulting in concomitant changes in VO 2 and VCO 2 . © 2012 Springer-Verlag Berlin Heidelberg.

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