Cardiorespiratory fitness profile of volunteer firefighters during intermittent incremental exercise: A cross-sectional study
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Le résumé fourni par la source
PURPOSE: We aimed to assess the physiological profile of male volunteer firefighters at a broad spectrum of exercise intensities to determine whether their cardiorespiratory fitness level is adequate to meet the physiological demands of their occupational activities. METHODS: Thirty-one male volunteer firefighters performed an intermittent incremental treadmill running exercise (with 4 min steps, 1 km·h-1 increments and 30 s rest periods). Cardiorespiratory variables were continuously monitored and blood lactate concentrations were obtained at baseline, throughout rest periods and post-exercise. The study followed a cross-sectional laboratory-based assessment, in accordance with the STROBE guidelines for cross-sectional studies. RESULTS: The increase in running velocity resulted in progressively higher values from low to severe exercise intensities in oxygen uptake (from 23.6 ± 7.5 to 44.1 ± 7.6 mL·kg-1·min-1; p < 0.001; ηp2 = 0.560), heart rate (from 133 ± 24 to 185 ± 14 bpm; p < 0.001; ηp2 = 0.459) and energy expenditure (from 127 ± 50 to 303 ± 51 kJ; p < 0.001; ηp2 = 0.654). Aerobic energy contributions progressively declined (94-83%), while anaerobic contributions increased (6-17%) across the incremental intensity domains. Inverse associations were reported between heart rate and body mass index at heavy (r = -0.38; p = 0.017) and severe (r = -0.34; p = 0.028) intensities, and with fat mass at heavy intensity (r = -0.32; p = 0.037). CONCLUSIONS: Findings evidenced a moderate to strong effect of exercise intensities on most assessed variables, and approximately half of the participants (~52%) did not meet the age-specific oxygen uptake threshold recommended by widely referenced National Fire Protection Association (NFPA-USA) guidelines for performing their professional duties. Given the firefighters' high physiological demands, they should follow structured training interventions and receive targeted nutritional guidance to improve their cardiorespiratory fitness while ensuring optimal performance in the field.
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Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- Cardiorespiratory fitness profile of volunteer firefighters during intermittent incremental exercise: A cross-sectional study
- Date Crossref
- 23/07/2026
- Éditeur
- Public Library of Science (PLoS)
- Type
- journal-article
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
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Universidade do Porto pays non établi dans la noticeUniversité ou école supérieure
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Instituto Piaget pays non établi dans la noticeUniversité ou école supérieure
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Centro de Investigação em Actividade Física Saúde e Lazer pays non établi dans la noticeUniversité ou école supérieure
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Faculty of Engineering Associate Laboratory of Energy pays non établi dans la noticeUniversité ou école supérieure
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Faculty of Sport CIFI2D pays non établi dans la noticeUniversité ou école supérieure
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Higher School of Sport and Education Piaget Research Center for Ecological Human Development pays non établi dans la noticeUniversité ou école supérieure
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Laboratory for Integrative and Translational Research in Population Health pays non établi dans la noticeStructure de recherche
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Faculty of Medicine Associate Laboratory of Energy pays non établi dans la noticeUniversité ou école supérieure
Universidade do Porto, Instituto Piaget et Centro de Investigação em Actividade Física Saúde e Lazer, avec 5 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.