{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,17]],"date-time":"2026-09-17T04:01:56Z","timestamp":1789617716273,"version":"build-2803163510"},"reference-count":0,"publisher":"Diving and Hyperbaric Medicine Journal","issue":"3","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Diving Hyperb Med"],"abstract":"<jats:p>This study evaluated the validity of the FitM\u00e1x questionnaire for estimating VO2peak in 157 Dutch Navy divers and recompression personnel, a population characterised by high physical fitness and occupational demands. While self-reported questionnaires offer a logistically feasible alternative to resource-intensive direct testing, their accuracy in fitness-to-dive assessments remains unclear. Participants completed the FitM\u00e1x questionnaire prior to cycle ergometry with direct VO2peak measurement. Results showed a moderate correlation (r = 0.631, P &amp;#x0003C; 0.001) between mean estimated VO2max (43.7, SD 5.34 mL\u00b7kg-1\u00b7min-1) and mean measured VO2peak (45.4, SD 6.52 mL\u00b7kg-1\u00b7min-1), with the questionnaire systematically underestimating fitness by 1.8 mL\u00b7kg-1\u00b7min-1, with a 95% confidence interval of agreement limit of \u00b1 10.9 mL\u00b7kg-1\u00b7min-1, and a moderate intraclass correlation coefficient of 0.748 (P &amp;#x0003C; 0.001). False-positive and false-negative rates were 8.9% and 10.8%, respectively, raising concerns about reliability for pass\/fail decisions. Participants reported difficulties answering questions unrelated to their routine activities, potentially contributing to the observed variability. Given these limitations, including the homogeneous, highly fit sample and the inability to differentiate between subgroups, the Royal Netherlands Navy Diving Medical Center has not adopted the FitM\u00e1x for fitness-to-dive evaluations. While questionnaires may streamline large-scale assessments, direct exercise testing remains valuable for precise, individualised risk stratification in occupational diving.<\/jats:p>","DOI":"10.28920\/dhm56.3.361-364","type":"journal-article","created":{"date-parts":[[2026,9,17]],"date-time":"2026-09-17T03:02:07Z","timestamp":1789614127000},"page":"361-364","source":"Crossref","is-referenced-by-count":0,"title":["Evaluating the FitM\u00e1x questionnaire for fitness-to-dive assessments in a military population"],"prefix":"10.28920","volume":"56","author":[{"given":"Pieter D","family":"Dijk","sequence":"first","affiliation":[{"name":"Royal Netherlands Navy Diving and Submarine Medical Center, Rijkszee en Marinehaven, Den Helder, the Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Paul","family":"Clarijs","sequence":"additional","affiliation":[{"name":"Royal Netherlands Navy Diving and Submarine Medical Center, Rijkszee en Marinehaven, Den Helder, the Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Thijs T","family":"Wingelaar","sequence":"additional","affiliation":[{"name":"Royal Netherlands Navy Diving and Submarine Medical Center, Rijkszee en Marinehaven, Den Helder, the Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"11463","published-online":{"date-parts":[[2026,9,30]]},"container-title":["Diving and Hyperbaric Medicine Journal"],"original-title":[],"deposited":{"date-parts":[[2026,9,17]],"date-time":"2026-09-17T03:02:18Z","timestamp":1789614138000},"score":1,"resource":{"primary":{"URL":"https:\/\/dhmjournal.com\/index.php?option=com_content&view=article&id=456"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2026,9,30]]},"references-count":0,"journal-issue":{"issue":"3","published-online":{"date-parts":[[2026,9,30]]}},"URL":"https:\/\/doi.org\/10.28920\/dhm56.3.361-364","relation":{},"ISSN":["2209-1491"],"issn-type":[{"value":"2209-1491","type":"electronic"}],"subject":[],"published":{"date-parts":[[2026,9,30]]}}}