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  • Title: Maintenance of vital capacity during repetitive breath-hold in a spearfishing competition.
    Author: Seccombe LM, Rogers PG, Jenkins CR, Peters MJ.
    Journal: Respirology; 2012 Feb; 17(2):350-3. PubMed ID: 22008376.
    Abstract:
    BACKGROUND AND OBJECTIVE: Cough and a reduction in vital capacity have recently been reported following breath-hold dives to depths of 25-75 m. We sought to investigate whether repetitive dives to depths of less than 30 m would elicit similar effects. METHODS: Participants in a single-day spearfishing competition were recruited. Subjects performed spirometry before and after the 5-h event. Demographics, medical and diving history, respiratory symptoms and competition diving statistics were collected. RESULTS: Twenty-five subjects (two females), age 33 years (11) (mean (SD)), were studied. During the competition each subject completed 76 (33) dives, to 10 (3) m depth, with each dive lasting 0.9 (0.3) min. Maximum depth was 17 (4) m. No respiratory symptoms were reported. There was no difference in spirometry before and after competition except for FEF(25-75%), which increased by 0.16(0.34) L (P < 0.05). CONCLUSIONS: Pulmonary oedema or lung injury is not common after repetitive breath-hold diving to depths to 25 m, or is too mild to be reflected in symptoms or spirometry.
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