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Physiological and performance effects of nitrate supplementation during roller-skiing in normoxia and normobaric hypoxia
Mittuniversitetet, Fakulteten för humanvetenskap, Avdelningen för hälsovetenskap.
Mittuniversitetet, Fakulteten för humanvetenskap, Avdelningen för hälsovetenskap.
Mittuniversitetet, Fakulteten för humanvetenskap, Avdelningen för hälsovetenskap.
Karolinska Institutet.
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2017 (Engelska)Ingår i: Nitric oxide, ISSN 1089-8603, E-ISSN 1089-8611, Vol. 70, s. 1-8Artikel i tidskrift (Refereegranskat) Published
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.

Ort, förlag, år, upplaga, sidor
2017. Vol. 70, s. 1-8
Nyckelord [en]
Beetroot juice, Endurance exercise, Simulated altitude, Work economy
Nationell ämneskategori
Idrottsvetenskap
Identifikatorer
URN: urn:nbn:se:miun:diva-31384DOI: 10.1016/j.niox.2017.08.001ISI: 000413888400001PubMedID: 28782598Scopus ID: 2-s2.0-85028057679OAI: oai:DiVA.org:miun-31384DiVA, id: diva2:1131140
Tillgänglig från: 2017-08-12 Skapad: 2017-08-12 Senast uppdaterad: 2017-12-15Bibliografiskt granskad

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Nybäck, LinnGlännerud, CarolineMcGawley, Kerry

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