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

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dc.contributor.authorMcQuillan, Joseph A.en_NZ
dc.contributor.authorCasadio, Julia R.en_NZ
dc.contributor.authorDulson, Deborah K.en_NZ
dc.contributor.authorLaursen, Paul B.en_NZ
dc.contributor.authorKilding, Andrew E.en_NZ
dc.date.accessioned2017-06-14T21:44:47Z
dc.date.available2017en_NZ
dc.date.available2017-06-14T21:44:47Z
dc.date.issued2017en_NZ
dc.description.abstractPurpose: 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.
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dc.identifier.citationMcQuillan, 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.2016-0793en
dc.identifier.doi10.1123/ijspp.2016-0793en_NZ
dc.identifier.eissn1555-0273en_NZ
dc.identifier.issn1555-0265en_NZ
dc.identifier.urihttps://hdl.handle.net/10289/11109
dc.language.isoen
dc.relation.isPartOfInternational Journal of Sports Physiology and Performanceen_NZ
dc.rightsThis is an author’s accepted version of an article published in the journal: International Journal of Sports Physiology and Performance. © 2017 Human Kinetics, Inc.
dc.titleThe Effect of Nitrate Supplementation on Cycling Performance in the Heat in Well-Trained Cyclistsen_NZ
dc.typeJournal Article
pubs.begin-page1
pubs.elements-id194480
pubs.end-page22
pubs.organisational-group/Waikato
pubs.organisational-group/Waikato/2018 PBRF
pubs.organisational-group/Waikato/OOVC
pubs.organisational-group/Waikato/OOVC/2018 PBRF - OOVC
pubs.organisational-group/Waikato/OOVC/Senior Deputy Vice-Chancellor
pubs.publication-statusPublisheden_NZ
uow.verification.statusunverified
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