Publication
Title
Test-retest variability of VO2max using total-capture indirect calorimetry reveals linear relationship of and power
Author
Abstract
This study aimed to analyze the intra‐individual variation in VO2max of human subjects using total‐capture and free‐flow indirect calorimetry. Twenty‐seven men (27±5 year; VO2max 49‐79 mlkg−1min−1) performed two maximal exertion tests (CPETs) on a cycle ergometer, separated by a 7±2 day interval. VO2 and VCO2 were assessed using an indirect calorimeter (Omnical) with total capture of exhalation in a free‐flow airstream. Thirteen subjects performed a third maximal exertion test using a breath‐by‐breath calorimeter (Oxycon Pro). On‐site validation was deemed a requirement. For the Omnical, the mean within‐subject CV for VO2max was 1.2±0.9% (0.0‐4.4%) and for ergometer workload Pmax 1.3±1.3% (0‐4.6%). VO2max values with the Oxycon Pro were significantly lower in comparison to Omnical (P<0.001; t‐test) with mean 3570 versus 4061 and difference SD 361 mlmin−1. Validation results for the Omnical with methanol combustion were ‐0.05±0.70% (mean±SD; n=31) at the 225 mlmin−1 VO2 level and ‐0.23±0.80% (n=31) at the 150 mlmin−1 VCO2 level. Results using gas‐infusion were 0.04±0.75% (n=34) and ‐0.99±1.05% (n=24) over the respective 500‐6000 mlmin−1 VO2 and VCO2 ranges. Validation results for the Oxycon pro in breath‐by‐breath mode were ‐ 2.2±1.6% (n=12) for VO2 and 5.7±3.3% (n=12) for VCO2 over the 1000‐4000 mlmin−1 range. On a Visual Analogue Scale participants reported improved breathing using the free‐flow (score 7.6±1.2 versus 5.1±2.7, p=0.008). We conclude that total capturing free‐flow indirect calorimetry is suitable for measuring VO2 even with the highest range. VO2max was linear with the incline in Pmax over the full range.
Language
English
Source (journal)
Scandinavian journal of medicine and science in sports. - Copenhagen
Publication
Copenhagen : 2019
ISSN
0905-7188
Volume/pages
29:2(2019), p. 213-222
ISI
000456093700007
Pubmed ID
30341979
Full text (Publisher's DOI)
Full text (open access)
UAntwerpen
Faculty/Department
Research group
Publication type
Subject
Affiliation
Publications with a UAntwerp address
External links
Web of Science
Record
Identification
Creation 25.10.2018
Last edited 15.07.2021
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