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Physiological and performance effects of nitrate supplementation during roller-skiing in normoxia and normobaric hypoxia
Mid Sweden University, Faculty of Human Sciences, Department of Health Sciences.
Mid Sweden University, Faculty of Human Sciences, Department of Health Sciences.
Mid Sweden University, Faculty of Human Sciences, Department of Health Sciences.
Karolinska Institutet.
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2017 (English)In: Nitric oxide, ISSN 1089-8603, E-ISSN 1089-8611Article in journal (Refereed) Epub ahead of print
Abstract [en]

The present study examined the effects of acute nitrate (NO3-) supplementation ingested in the form of concentrated beetroot juice on cross-country roller-ski performance in normoxia (N) and normobaric hypoxia (H). Eight competitive cross-country skiers (five males: age 22 ± 3 years, V·O2max 71.5 ± 4.7 mL kg-1·min-1; three females: age 21 ± 1 years, V·O2max 58.4 ± 2.5 mL kg-1·min-1) were supplemented with a single dose of NO3--rich beetroot juice (BRJ, ∼13 mmol NO3-) or a NO3--depleted placebo (PL, ∼0 mmol NO3-) and performed 2 x 6-min submaximal exercise bouts and a 1000-m time-trial (TT) on a treadmill in N (20.9% O2) or H (16.8% O2). The four experimental trials were presented in a randomised, counter-balanced order. Plasma NO3- and nitrite concentrations were significantly higher following BRJ compared to PL (both p < 0.001). However, respiratory variables, heart rate, blood lactate concentration, ratings of perceived exertion, and near-infrared spectroscopy-derived measures of muscle tissue oxygenation during submaximal exercise were not significantly different between BRJ and PL (all p > 0.05). Likewise, time to complete the TT was unaffected by supplementation in both N and H (p > 0.05). In conclusion, an acute dose of ∼13 mmol NO3- does not affect physiological or performance responses to submaximal or maximal treadmill roller-skiing in competitive cross-country skiers exercising in N and H.

Place, publisher, year, edition, pages
Elsevier, 2017.
Keyword [en]
Beetroot juice, Endurance exercise, Simulated altitude, Work economy
National Category
Sport and Fitness Sciences
Identifiers
URN: urn:nbn:se:miun:diva-31384DOI: 10.1016/j.niox.2017.08.001OAI: oai:DiVA.org:miun-31384DiVA: diva2:1131140
Available from: 2017-08-12 Created: 2017-08-12 Last updated: 2017-08-21Bibliographically approved

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Nybäck, LinnGlännerud, CarolineMcGawley, Kerry
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CiteExportLink to record
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