{"entity": "journal", "iuid": "e3cc07e2979546319362afc87ca33a17", "timestamp": "2026-08-29T04:18:54.545Z", "links": {"self": {"href": "https://publications-affiliated.scilifelab.se/journal/Scand%20J%20Med%20Sci%20Sports.json"}, "display": {"href": "https://publications-affiliated.scilifelab.se/journal/Scand%20J%20Med%20Sci%20Sports"}}, "title": "Scand J Med Sci Sports", "issn": "1600-0838", "issn-l": null, "publications_count": 1, "publications": [{"entity": "publication", "iuid": "d9ab2892a1344951b5e883f759a097bf", "links": {"self": {"href": "https://publications-affiliated.scilifelab.se/publication/d9ab2892a1344951b5e883f759a097bf.json"}, "display": {"href": "https://publications-affiliated.scilifelab.se/publication/d9ab2892a1344951b5e883f759a097bf"}}, "title": "Test-retest variability of VO2max using total-capture indirect calorimetry reveals linear relationship of VO2 and Power.", "authors": [{"family": "Schoffelen", "given": "Paul F M", "initials": "PFM", "orcid": "0000-0001-5680-4188", "researcher": {"href": "https://publications-affiliated.scilifelab.se/researcher/e735d43e53a04a23a3e3b8fe5dda6cf5.json"}}, {"family": "den Hoed", "given": "Marcel", "initials": "M"}, {"family": "van Breda", "given": "Eric", "initials": "E"}, {"family": "Plasqui", "given": "Guy", "initials": "G"}], "type": "journal article", "published": "2019-02-00", "journal": {"title": "Scand J Med Sci Sports", "issn": "1600-0838", "volume": "29", "issue": "2", "pages": "213-222", "issn-l": null}, "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 \u00b1 5 year; VO2max 49-79 mL\u2022kg-1 \u2022min-1 ) performed two maximal exertion tests (CPETs) on a cycle ergometer, separated by a 7 \u00b1 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 \u00b1 0.9% (0.0%-4.4%) and for ergometer workload P max 1.3 \u00b1 1.3% (0%-4.6%). VO2max values with the Oxycon Pro were significantly lower in comparison with Omnical (P < 0.001; t test) with mean 3570 vs 4061 and difference SD 361 mL\u2022min-1 . Validation results for the Omnical with methanol combustion were -0.05 \u00b1 0.70% (mean \u00b1 SD; n = 31) at the 225 mL\u2022min-1 VO2 level and -0.23 \u00b1 0.80% (n = 31) at the 150 mL\u2022min-1 VCO2 level. Results using gas infusion were 0.04 \u00b1 0.75% (n = 34) and -0.99 \u00b1 1.05% (n = 24) over the respective 500-6000 mL\u2022min-1 VO2 and VCO2 ranges. Validation results for the Oxycon Pro in breath-by-breath mode were - 2.2 \u00b1 1.6% (n = 12) for VO2 and 5.7 \u00b1 3.3% (n = 12) for VCO2 over the 1000-4000 mL\u2022min-1 range. On a Visual analog scale, participants reported improved breathing using the free-flow indirect calorimetry (score 7.6 \u00b1 1.2 vs 5.1 \u00b1 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 P max over the full range.", "doi": "10.1111/sms.13324", "pmid": "30341979", "labels": [], "xrefs": [{"db": "pmc", "key": "PMC7379248"}], "notes": [], "created": "2026-08-21T12:21:43.914Z", "modified": "2026-08-21T12:21:44.029Z"}], "created": "2026-08-21T12:21:43.990Z", "modified": "2026-08-21T12:21:43.991Z"}