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Acute dietary nitrate supplementation improves dry static apnea performance
Mid Sweden University, Faculty of Science, Technology and Media, Department of Engineering and Sustainable Development.
Univ Exeter, Coll Life & Environm Sci, Exeter, Devon, England.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Engineering and Sustainable Development.
Mid Sweden University, Faculty of Human Sciences, Department of Health Sciences. (NVC)
2012 (English)In: Respiratory Physiology & Neurobiology, ISSN 1569-9048, E-ISSN 1878-1519, Vol. 182, no 2-3, 53-59 p.Article in journal (Refereed) Published
Abstract [en]

Acute dietary nitrate (NO3-) supplementation has been reported to lower resting blood pressure, reduce the oxygen (O-2) cost of sub-maximal exercise, and improve exercise tolerance. Given the proposed effects of NO3- on tissue oxygenation and metabolic rate, it is possible that NO3- supplementation might enhance the duration of resting apnea. If so, this might have important applications both in medicine and sport. We investigated the effects of acute NO3- supplementation on pre-apnea blood pressure, apneic duration, and the heart rate (HR) and arterial O-2 saturation (SaO(2)) responses to sub-maximal and maximal apneas in twelve well-trained apnea divers. Subjects were assigned in a randomized, double blind, crossover design to receive 70 ml of beetroot juice (BR; containing similar to 5.0 mmol of nitrate) and placebo juice (PL; similar to 0.003 mmol of nitrate) treatments. At 2.5 h post-ingestion, the subjects completed a series of two 2-min (sub-maximal) static apneas separated by 3 min of rest, followed by a maximal effort apnea. Relative to PL, BR reduced resting mean arterial pressure by 2% (PL: 86 +/- 7 vs. BR: 84 +/- 6 mmHg; P = 0.04). The mean nadir for SaO(2) after the two sub-maximal apneas was 97.2 +/- 1.6% in PL and 98.5 +/- 0.9% in BR (P = 0.03) while the reduction in HR from baseline was not significantly different between PL and BR. Importantly, BR increased maximal apneic duration by 11% (PL: 250 +/- 58 vs. BR: 278 +/- 64 s; P = 0.04). In the longer maximal apneas in BR, the magnitude of the reductions in HR and SaO(2) were greater than in PL (P <= 0.05). The results suggest that acute dietary NO3- supplementation may increase apneic duration by reducing metabolic costs. (c) 2012 Elsevier B.V. All rights reserved.

Place, publisher, year, edition, pages
2012. Vol. 182, no 2-3, 53-59 p.
Keyword [en]
Oxygen consumption, Diving response, Hypoxia, Breath-hold, Blood pressure
National Category
Sport and Fitness Sciences
Identifiers
URN: urn:nbn:se:miun:diva-17065DOI: 10.1016/j.resp.2012.05.007ISI: 000306636200001Scopus ID: 2-s2.0-84862885023OAI: oai:DiVA.org:miun-17065DiVA: diva2:558024
Available from: 2012-10-01 Created: 2012-09-26 Last updated: 2015-06-01Bibliographically approved
In thesis
1. Cardiovascular, hematological and dietary means to cope with environmentally induced hypoxia in humans
Open this publication in new window or tab >>Cardiovascular, hematological and dietary means to cope with environmentally induced hypoxia in humans
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Östersund: Mid Sweden University, 2015. 87 p.
Series
Mid Sweden University doctoral thesis, ISSN 1652-893X ; 213
National Category
Sport and Fitness Sciences Physiology
Identifiers
urn:nbn:se:miun:diva-25016 (URN)978-91-88025-01-2 (ISBN)
Supervisors
Available from: 2015-06-01 Created: 2015-06-01 Last updated: 2015-06-15Bibliographically approved

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