Research Commons
      • Browse 
        • Communities & Collections
        • Titles
        • Authors
        • By Issue Date
        • Subjects
        • Types
        • Series
      • Help 
        • About
        • Collection Policy
        • OA Mandate Guidelines
        • Guidelines FAQ
        • Contact Us
      • My Account 
        • Sign In
        • Register
      View Item 
      •   Research Commons
      • University of Waikato Research
      • Education
      • Education Papers
      • View Item
      •   Research Commons
      • University of Waikato Research
      • Education
      • Education Papers
      • View Item
      JavaScript is disabled for your browser. Some features of this site may not work without it.

      The Effect of Nitrate Supplementation on Cycling Performance in the Heat in Well-Trained Cyclists

      McQuillan, Joseph A.; Casadio, Julia R.; Dulson, Deborah K.; Laursen, Paul B.; Kilding, Andrew E.
      Thumbnail
      Files
      McQuillan et al The Effect of Nitrate Supplementation on Cycling Performance in the Heat IJSPP.pdf
      Accepted version, 685.0Kb
      DOI
       10.1123/ijspp.2016-0793
      Find in your library  
      Citation
      Export citation
      McQuillan, J. A., Casadio, J. R., Dulson, D. K., Laursen, P. B., & Kilding, A. E. (2017). The Effect of Nitrate Supplementation on Cycling Performance in the Heat in Well-Trained Cyclists. International Journal of Sports Physiology and Performance, 1–22. https://doi.org/10.1123/ijspp.2016-0793
      Permanent Research Commons link: https://hdl.handle.net/10289/11109
      Abstract
      Purpose:

      The aim of this study was to determine the effect of NO₃⁻ consumption on measures of perception, thermoregulation and cycling performance in hot conditions.

      Methods:

      Using a randomised, double-blind, crossover-design, 8 well-trained cyclists (mean ± SD: age: 25 ± 8 y, V̇O2peak: 64 ± 5 ml·kg⁻¹·min⁻¹) performed 2 separate trials, in hot (35°C, 60% relative humidity) environments, having ingested either 140 ml NO3--rich beetroot juice ~8 mmol NO₃⁻ (NIT), or placebo (PLA), daily for 3-days with a 7-day washout period separating trials. Trials consisted of 2 × 10 min bouts at 40 and 60% peak power output (PPO) to determine physiological and perceptual responses in the heat, followed by a 4 km cycling time-trial.

      Results:

      Basal [nitrite] was substantially elevated in NIT (2.70 ± 0.98 μM) vs PLA (1.10 ± 0.61 μM) resulting in a most likely (ES = 1.58 ± 0.93) increase after 3-days. There was a very likely trivial increase in rectal temperature [Tᵣₑ] in NIT at 40% (PLA;37.4 ± 0.2°C vs NIT;37.5 ± 0.3°C, 0.1 ± 0.2°C) and 60% (PLA;37.8 ± 0.2°C vs NIT;37.9 ± 0.3°C, 0.1 ± 0.2°C) PPO. Cycling performance was similar between trials (PLA;336 ± 45 W vs NIT;337 ± 50 W, CV±95%CL; 0.2 ± 2.5%). Outcomes for heart rate, and perceptual measures were unclear across the majority of time-points.

      Conclusions:

      Three days of NO₃⁻ supplementation, resulted in small increases in Tᵣₑ during low- to moderate-intensity exercise, however this did not appear to influence 4 km cycling time-trial performance in hot climates.
      Date
      2017
      Type
      Journal Article
      Rights
      This is an author’s accepted version of an article published in the journal: International Journal of Sports Physiology and Performance. © 2017 Human Kinetics, Inc.
      Collections
      • Education Papers [1411]
      Show full item record  

      Usage

      Downloads, last 12 months
      193
       
       
       

      Usage Statistics

      For this itemFor all of Research Commons

      The University of Waikato - Te Whare Wānanga o WaikatoFeedback and RequestsCopyright and Legal Statement