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Dietary nitrate enhances arterial oxygen saturation after dynamic apnea
Mid Sweden University, Faculty of Human Sciences, Department of Health Sciences.
Mid Sweden University, Faculty of Human Sciences, Department of Health Sciences. (Swedish Winter Sports Research Centre)
2017 (English)In: Scandinavian Journal of Medicine and Science in Sports, ISSN 0905-7188, E-ISSN 1600-0838, Vol. 27, no 6, 622-626 p.Article in journal (Refereed) Published
Abstract [en]

Breath-hold divers train to minimize their oxygen consumption to improve their apneic performance. Dietary nitrate has been shown to reduce the oxygen cost in a variety of situations, and our aim was to study its effect on arterial oxygen saturation (SaO2) after dynamic apnea (DYN) performance. Fourteen healthy male apnea divers (aged 33 ± 11 years) received either 70 mL of concentrated nitrate-rich beetroot juice (BR) or placebo (PL) on different days. At 2.5 h after ingesting the juice, they were asked to perform 2 × 75 m DYN dives in a pool with 4.5-min recovery between dives. Each dive started after 2-min countdown and without any warm-up apneas, hyperventilation, or lung packing. SaO2 and heart rate were measured via pulse oximetry for 90 s before and after each dive. Mean SaO2 nadir values after the dives were 83.4 ± 10.8% with BR and 78.3 ± 11.0% with PL (P < 0.05). At 20-s post-dive, mean SaO2 was 86.3 ± 10.6% with BR and 79.4 ± 10.2% with PL (P < 0.05). In conclusion, BR juice was found to elevate SaO2 after 75-m DYN. These results suggest an oxygen conserving effect of dietary nitrate supplementation, which likely has a positive effect on maximal apnea performance.

Place, publisher, year, edition, pages
2017. Vol. 27, no 6, 622-626 p.
Keyword [en]
Anaerobic exercise, Apneic diving, Arterial desaturation, Breath-hold, Hypoxia, Immersion, Nitrate, Sport performance
National Category
Sport and Fitness Sciences
Identifiers
URN: urn:nbn:se:miun:diva-29605DOI: 10.1111/sms.12684ISI: 000400610600005PubMedID: 27037996Scopus ID: 2-s2.0-84963617381OAI: oai:DiVA.org:miun-29605DiVA: diva2:1056911
Note

First published: 31 March 2016

Available from: 2016-12-15 Created: 2016-12-15 Last updated: 2017-07-04Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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