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Title
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Test-retest variability of VO2max using total-capture indirect calorimetry reveals linear relationship of and power
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Author
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Abstract
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| 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. |
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Language
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English
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Source (journal)
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Scandinavian journal of medicine and science in sports. - Copenhagen
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Publication
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Copenhagen
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2019
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ISSN
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0905-7188
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DOI
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10.1111/SMS.13324
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Volume/pages
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29
:2
(2019)
, p. 213-222
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ISI
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000456093700007
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Pubmed ID
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30341979
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Full text (Publisher's DOI)
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Full text (open access)
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