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  • 1.
    Bakker, Emily
    et al.
    Norwegian Univ Sci & Technol, Dept Circulat & Med Imaging, Fac Med, KG Jebsen Ctr Exercise Med, N-7006 Trondheim, Norway..
    Engan, Harald
    Mid Sweden University, Faculty of Human Sciences, Department of Health Sciences. ;LHL Hlth, LHL Klinikkene Raros, Roros, Norway..
    Patrician, Alexander
    Mid Sweden University, Faculty of Human Sciences, Department of Health Sciences.
    Schagatay, Erika
    Mid Sweden University, Faculty of Human Sciences, Department of Health Sciences.
    Karlsen, Trine
    Norwegian Univ Sci & Technol, Dept Circulat & Med Imaging, Fac Med, KG Jebsen Ctr Exercise Med, N-7006 Trondheim, Norway.;St Olavs Univ Hosp, Trondheim, Norway..
    Wisloff, Ulrik
    Norwegian Univ Sci & Technol, Dept Circulat & Med Imaging, Fac Med, KG Jebsen Ctr Exercise Med, N-7006 Trondheim, Norway..
    Gaustad, Svein Erik
    Norwegian Univ Sci & Technol, Dept Circulat & Med Imaging, Fac Med, KG Jebsen Ctr Exercise Med, N-7006 Trondheim, Norway..
    Acute dietary nitrate supplementation improves arterial endothelial function at high altitude: A double-blinded randomized controlled cross over study2015In: Nitric oxide, ISSN 1089-8603, E-ISSN 1089-8611, Vol. 50, p. 58-64Article in journal (Refereed)
    Abstract [en]

    Introduction: Dietary nitrate (NO3-) supplementation serves as an exogenous source of nitrite (NO3-) and nitric oxide (NO) through the NO3- NO3- NO pathway, and may improve vascular functions during normoxia. The effects of NO3- supplementation in healthy lowlanders during hypobaric hypoxia are unknown. Purpose: Determine the effect of acute oral NO3- supplementation via beetroot juice (BJ) on endothelial function (flow mediated dilation; FMD) in lowlanders at 3700 m. Methods: FMD was measured using ultrasound and Doppler in the brachial artery of 11 healthy subjects (4 females, age 25 +/- 5 yrs; height 1.8 +/- 0.1 m, weight 72 +/- 10 kg) sojourning to high altitude. In a randomized, double-blinded crossover study design, FMD was measured 3 h after drinking BJ (5.0 mmol NO3-) and placebo (PL; 0.003 mmol No-3(-)) supplementation at 3700 m, with a 24-h wash out period between tests. FMD was also measured without any BJ supplementation pre-trek at 1370 m, after 5 days at 4200 m and upon return to 1370 m after 4 weeks of altitude exposure (above 2500 m). The altitude exposure was interrupted by a decent to lower altitude where subjects spent two nights at 1370 m before returning to altitude again. Results: Ten subjects completed the NO3- supplementation. FMD (mean +/- SD) pre-trek value was 6.53 +/- 2.32% at 1370 m. At 3700 m FMD was reduced to 3.84 +/- 1.31% (p < 0.01) after PL supplementation but was normalized after receiving BJ (5.77 +/- 1.14% (p = 1.00). Eight of the subjects completed the interrupted 4-week altitude stay, and their FMD was lower at 4200 m (FMD 3.04 +/- 2.22%) and at post-altitude exposure to 1370 m (FMD 3.91 +/- 2.58%) compared to pre-trek FMD at 1370 m. Conclusion: Acute dietary NO3- supplementation may abolish altitude-induced reduction in endothelial function, and can serve as a dietary strategy to ensure peripheral vascular function in lowland subjects entering high altitude environments. (C) 2015 Elsevier Inc. All rights reserved.

  • 2.
    Nybäck, Linn
    et al.
    Mid Sweden University, Faculty of Human Sciences, Department of Health Sciences.
    Glännerud, Caroline
    Mid Sweden University, Faculty of Human Sciences, Department of Health Sciences.
    Larsson, Gustav
    Mid Sweden University, Faculty of Human Sciences, Department of Health Sciences.
    Weitzberg, Eddie
    Karolinska Institutet.
    Shannon, Oliver
    Leeds Beckett University, UK.
    McGawley, Kerry
    Mid Sweden University, Faculty of Human Sciences, Department of Health Sciences.
    Physiological and performance effects of nitrate supplementation during roller-skiing in normoxia and normobaric hypoxia2017In: Nitric oxide, ISSN 1089-8603, E-ISSN 1089-8611, Vol. 70, p. 1-8Article in journal (Refereed)
    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.

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